src/com/android/launcher3/Launcher.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.android.launcher3;

import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_NOSENSOR;
import static android.content.pm.ActivityInfo.SCREEN_ORIENTATION_UNSPECIFIED;

import static com.android.launcher3.ItemInfoWithIcon.FLAG_DISABLED_BY_PUBLISHER;
import static com.android.launcher3.ItemInfoWithIcon.FLAG_DISABLED_LOCKED_USER;
import static com.android.launcher3.ItemInfoWithIcon.FLAG_DISABLED_QUIET_USER;
import static com.android.launcher3.ItemInfoWithIcon.FLAG_DISABLED_SAFEMODE;
import static com.android.launcher3.ItemInfoWithIcon.FLAG_DISABLED_SUSPENDED;
import static com.android.launcher3.LauncherAnimUtils.SPRING_LOADED_EXIT_DELAY;
import static com.android.launcher3.LauncherState.ALL_APPS;
import static com.android.launcher3.LauncherState.NORMAL;
import static com.android.launcher3.LauncherState.OVERVIEW;
import static com.android.launcher3.logging.LoggerUtils.newContainerTarget;
import static com.android.launcher3.util.RunnableWithId.RUNNABLE_ID_BIND_APPS;
import static com.android.launcher3.util.RunnableWithId.RUNNABLE_ID_BIND_WIDGETS;

import android.Manifest;
import android.animation.Animator;
import android.animation.AnimatorListenerAdapter;
import android.animation.AnimatorSet;
import android.animation.ObjectAnimator;
import android.animation.ValueAnimator;
import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.app.ActivityOptions;
import android.app.AlertDialog;
import android.app.SearchManager;
import android.appwidget.AppWidgetHostView;
import android.appwidget.AppWidgetManager;
import android.content.ActivityNotFoundException;
import android.content.BroadcastReceiver;
import android.content.ComponentCallbacks2;
import android.content.ComponentName;
import android.content.Context;
import android.content.ContextWrapper;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.IntentSender;
import android.content.SharedPreferences;
import android.content.SharedPreferences.OnSharedPreferenceChangeListener;
import android.content.pm.PackageManager;
import android.database.sqlite.SQLiteDatabase;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.AsyncTask;
import android.os.Binder;
import android.os.Build;
import android.os.Bundle;
import android.os.Parcelable;
import android.os.Process;
import android.os.StrictMode;
import android.os.UserHandle;
import android.support.annotation.Nullable;
import android.text.Selection;
import android.text.SpannableStringBuilder;
import android.text.TextUtils;
import android.text.method.TextKeyListener;
import android.util.Log;
import android.util.SparseArray;
import android.view.Display;
import android.view.HapticFeedbackConstants;
import android.view.KeyEvent;
import android.view.KeyboardShortcutGroup;
import android.view.KeyboardShortcutInfo;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MotionEvent;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.view.accessibility.AccessibilityEvent;
import android.view.animation.OvershootInterpolator;
import android.view.inputmethod.InputMethodManager;
import android.widget.Toast;

import com.android.launcher3.DropTarget.DragObject;
import com.android.launcher3.LauncherSettings.Favorites;
import com.android.launcher3.Workspace.ItemOperator;
import com.android.launcher3.accessibility.LauncherAccessibilityDelegate;
import com.android.launcher3.allapps.AllAppsContainerView;
import com.android.launcher3.allapps.AllAppsTransitionController;
import com.android.launcher3.compat.AppWidgetManagerCompat;
import com.android.launcher3.compat.LauncherAppsCompat;
import com.android.launcher3.compat.LauncherAppsCompatVO;
import com.android.launcher3.compat.UserManagerCompat;
import com.android.launcher3.config.FeatureFlags;
import com.android.launcher3.dragndrop.DragController;
import com.android.launcher3.dragndrop.DragLayer;
import com.android.launcher3.dragndrop.DragOptions;
import com.android.launcher3.dragndrop.DragView;
import com.android.launcher3.dragndrop.PinItemDragListener;
import com.android.launcher3.dynamicui.WallpaperColorInfo;
import com.android.launcher3.folder.Folder;
import com.android.launcher3.folder.FolderIcon;
import com.android.launcher3.keyboard.CustomActionsPopup;
import com.android.launcher3.keyboard.ViewGroupFocusHelper;
import com.android.launcher3.logging.FileLog;
import com.android.launcher3.logging.UserEventDispatcher;
import com.android.launcher3.model.ModelWriter;
import com.android.launcher3.notification.NotificationListener;
import com.android.launcher3.pageindicators.PageIndicator;
import com.android.launcher3.popup.BaseActionPopup;
import com.android.launcher3.popup.PopupContainerWithArrow;
import com.android.launcher3.popup.PopupDataProvider;
import com.android.launcher3.shortcuts.DeepShortcutManager;
import com.android.launcher3.states.AllAppsState;
import com.android.launcher3.states.InternalStateHandler;
import com.android.launcher3.userevent.nano.LauncherLogProto;
import com.android.launcher3.userevent.nano.LauncherLogProto.Action;
import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
import com.android.launcher3.userevent.nano.LauncherLogProto.ControlType;
import com.android.launcher3.userevent.nano.LauncherLogProto.Target;
import com.android.launcher3.util.ActivityResultInfo;
import com.android.launcher3.util.ComponentKey;
import com.android.launcher3.util.ItemInfoMatcher;
import com.android.launcher3.util.MultiHashMap;
import com.android.launcher3.util.PackageManagerHelper;
import com.android.launcher3.util.PackageUserKey;
import com.android.launcher3.util.PendingRequestArgs;
import com.android.launcher3.util.RunnableWithId;
import com.android.launcher3.util.SystemUiController;
import com.android.launcher3.util.Themes;
import com.android.launcher3.util.Thunk;
import com.android.launcher3.util.TraceHelper;
import com.android.launcher3.util.UiThreadHelper;
import com.android.launcher3.util.ViewOnDrawExecutor;
import com.android.launcher3.widget.PendingAddShortcutInfo;
import com.android.launcher3.widget.PendingAddWidgetInfo;
import com.android.launcher3.widget.WidgetAddFlowHandler;
import com.android.launcher3.widget.WidgetHostViewLoader;
import com.android.launcher3.widget.WidgetListRowEntry;
import com.android.launcher3.widget.WidgetsFullSheet;
import com.android.launcher3.widget.custom.CustomWidgetParser;

import java.io.FileDescriptor;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.concurrent.Executor;

/**
 * Default launcher application.
 */
public class Launcher extends BaseActivity
        implements LauncherExterns, View.OnClickListener, OnLongClickListener,
                   LauncherModel.Callbacks, View.OnTouchListener, LauncherProviderChangeListener,
                   WallpaperColorInfo.OnThemeChangeListener {
    public static final String TAG = "Launcher";
    static final boolean LOGD = false;

    static final boolean DEBUG_STRICT_MODE = false;

    private static final int REQUEST_CREATE_SHORTCUT = 1;
    private static final int REQUEST_CREATE_APPWIDGET = 5;

    private static final int REQUEST_PICK_APPWIDGET = 9;
    private static final int REQUEST_PICK_WALLPAPER = 10;

    private static final int REQUEST_BIND_APPWIDGET = 11;
    private static final int REQUEST_BIND_PENDING_APPWIDGET = 12;
    private static final int REQUEST_RECONFIGURE_APPWIDGET = 13;

    private static final int REQUEST_PERMISSION_CALL_PHONE = 14;

    private static final float BOUNCE_ANIMATION_TENSION = 1.3f;

    /**
     * IntentStarter uses request codes starting with this. This must be greater than all activity
     * request codes used internally.
     */
    protected static final int REQUEST_LAST = 100;

    // The Intent extra that defines whether to ignore the launch animation
    static final String INTENT_EXTRA_IGNORE_LAUNCH_ANIMATION =
            "com.android.launcher3.intent.extra.shortcut.INGORE_LAUNCH_ANIMATION";

    // Type: int
    private static final String RUNTIME_STATE_CURRENT_SCREEN = "launcher.current_screen";
    // Type: int
    private static final String RUNTIME_STATE = "launcher.state";
    // Type: PendingRequestArgs
    private static final String RUNTIME_STATE_PENDING_REQUEST_ARGS = "launcher.request_args";
    // Type: ActivityResultInfo
    private static final String RUNTIME_STATE_PENDING_ACTIVITY_RESULT = "launcher.activity_result";
    // Type: SparseArray<Parcelable>
    private static final String RUNTIME_STATE_WIDGET_PANEL = "launcher.widget_panel";

    private LauncherStateManager mStateManager;

    private boolean mIsSafeModeEnabled;

    private static final int ON_ACTIVITY_RESULT_ANIMATION_DELAY = 500;

    // How long to wait before the new-shortcut animation automatically pans the workspace
    private static final int NEW_APPS_PAGE_MOVE_DELAY = 500;
    private static final int NEW_APPS_ANIMATION_INACTIVE_TIMEOUT_SECONDS = 5;
    @Thunk static final int NEW_APPS_ANIMATION_DELAY = 500;

    @Thunk Workspace mWorkspace;
    private View mLauncherView;
    @Thunk DragLayer mDragLayer;
    private DragController mDragController;

    private AppWidgetManagerCompat mAppWidgetManager;
    private LauncherAppWidgetHost mAppWidgetHost;

    private final int[] mTmpAddItemCellCoordinates = new int[2];

    @Thunk Hotseat mHotseat;

    private View mAllAppsButton;

    private DropTargetBar mDropTargetBar;

    // Main container view for the all apps screen.
    @Thunk AllAppsContainerView mAppsView;
    AllAppsTransitionController mAllAppsController;

    // UI and state for the overview panel
    private ViewGroup mOverviewPanel;

    // We need to store the orientation Launcher was created with, due to a bug (b/64916689)
    // that results in widgets being inflated in the wrong orientation.
    private int mOrientation;

    private SpannableStringBuilder mDefaultKeySsb = null;

    @Thunk boolean mWorkspaceLoading = true;

    private boolean mPaused = true;
    private boolean mOnResumeNeedsLoad;

    private final ArrayList<Runnable> mBindOnResumeCallbacks = new ArrayList<>();
    private OnResumeCallback mOnResumeCallback;

    private ViewOnDrawExecutor mPendingExecutor;

    private LauncherModel mModel;
    private ModelWriter mModelWriter;
    private IconCache mIconCache;
    private LauncherAccessibilityDelegate mAccessibilityDelegate;
    private boolean mHasFocus = false;

    private ObjectAnimator mScrimAnimator;
    private boolean mShouldFadeInScrim;

    private PopupDataProvider mPopupDataProvider;

    private final ArrayList<Integer> mSynchronouslyBoundPages = new ArrayList<>();

    // We only want to get the SharedPreferences once since it does an FS stat each time we get
    // it from the context.
    private SharedPreferences mSharedPrefs;

    // Activity result which needs to be processed after workspace has loaded.
    private ActivityResultInfo mPendingActivityResult;
    /**
     * Holds extra information required to handle a result from an external call, like
     * {@link #startActivityForResult(Intent, int)} or {@link #requestPermissions(String[], int)}
     */
    private PendingRequestArgs mPendingRequestArgs;

    private float mLastDispatchTouchEventX = 0.0f;

    public ViewGroupFocusHelper mFocusHandler;
    private boolean mRotationEnabled = false;
    private boolean mAppLaunchSuccess;

    private RotationPrefChangeHandler mRotationPrefChangeHandler;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        if (DEBUG_STRICT_MODE) {
            StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
                    .detectDiskReads()
                    .detectDiskWrites()
                    .detectNetwork()   // or .detectAll() for all detectable problems
                    .penaltyLog()
                    .build());
            StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder()
                    .detectLeakedSqlLiteObjects()
                    .detectLeakedClosableObjects()
                    .penaltyLog()
                    .penaltyDeath()
                    .build());
        }
        TraceHelper.beginSection("Launcher-onCreate");

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.preOnCreate();
        }

        WallpaperColorInfo wallpaperColorInfo = WallpaperColorInfo.getInstance(this);
        wallpaperColorInfo.setOnThemeChangeListener(this);
        overrideTheme(wallpaperColorInfo.isDark(), wallpaperColorInfo.supportsDarkText());

        super.onCreate(savedInstanceState);
        TraceHelper.partitionSection("Launcher-onCreate", "super call");

        LauncherAppState app = LauncherAppState.getInstance(this);

        // Load configuration-specific DeviceProfile
        mDeviceProfile = app.getInvariantDeviceProfile().getDeviceProfile(this);
        if (isInMultiWindowModeCompat()) {
            Display display = getWindowManager().getDefaultDisplay();
            Point mwSize = new Point();
            display.getSize(mwSize);
            mDeviceProfile = mDeviceProfile.getMultiWindowProfile(this, mwSize);
        }

        mOrientation = getResources().getConfiguration().orientation;
        mSharedPrefs = Utilities.getPrefs(this);
        mIsSafeModeEnabled = getPackageManager().isSafeMode();
        mModel = app.setLauncher(this);
        mModelWriter = mModel.getWriter(mDeviceProfile.isVerticalBarLayout());
        mIconCache = app.getIconCache();
        mAccessibilityDelegate = new LauncherAccessibilityDelegate(this);

        mDragController = new DragController(this);
        mAllAppsController = new AllAppsTransitionController(this);
        mStateManager = new LauncherStateManager(this);

        mAppWidgetManager = AppWidgetManagerCompat.getInstance(this);

        mAppWidgetHost = new LauncherAppWidgetHost(this);
        mAppWidgetHost.startListening();

        // If we are getting an onCreate, we can actually preempt onResume and unset mPaused here,
        // this also ensures that any synchronous binding below doesn't re-trigger another
        // LauncherModel load.
        mPaused = false;

        mLauncherView = LayoutInflater.from(this).inflate(R.layout.launcher, null);

        setupViews();
        mDeviceProfile.layout(this, false /* notifyListeners */);

        mPopupDataProvider = new PopupDataProvider(this);

        restoreState(savedInstanceState);

        // We only load the page synchronously if the user rotates (or triggers a
        // configuration change) while launcher is in the foreground
        int currentScreen = PagedView.INVALID_RESTORE_PAGE;
        if (savedInstanceState != null) {
            currentScreen = savedInstanceState.getInt(RUNTIME_STATE_CURRENT_SCREEN, currentScreen);
        }
        if (!mModel.startLoader(currentScreen)) {
            // If we are not binding synchronously, show a fade in animation when
            // the first page bind completes.
            mDragLayer.setAlpha(0);
        } else {
            // Pages bound synchronously.
            mWorkspace.setCurrentPage(currentScreen);

            setWorkspaceLoading(true);
        }

        // For handling default keys
        mDefaultKeySsb = new SpannableStringBuilder();
        Selection.setSelection(mDefaultKeySsb, 0);

        mRotationEnabled = getResources().getBoolean(R.bool.allow_rotation);
        // In case we are on a device with locked rotation, we should look at preferences to check
        // if the user has specifically allowed rotation.
        if (!mRotationEnabled) {
            mRotationEnabled = Utilities.isAllowRotationPrefEnabled(getApplicationContext());
            mRotationPrefChangeHandler = new RotationPrefChangeHandler();
            mSharedPrefs.registerOnSharedPreferenceChangeListener(mRotationPrefChangeHandler);
        }

        if (PinItemDragListener.handleDragRequest(this, getIntent())) {
            // Temporarily enable the rotation
            mRotationEnabled = true;
        }

        // On large interfaces, or on devices that a user has specifically enabled screen rotation,
        // we want the screen to auto-rotate based on the current orientation
        setRequestedOrientation(mRotationEnabled
                ? SCREEN_ORIENTATION_UNSPECIFIED : SCREEN_ORIENTATION_NOSENSOR);

        setContentView(mLauncherView);

        // Listen for broadcasts
        IntentFilter filter = new IntentFilter();
        filter.addAction(Intent.ACTION_SCREEN_OFF);
        filter.addAction(Intent.ACTION_USER_PRESENT); // When the device wakes up + keyguard is gone
        registerReceiver(mReceiver, filter);
        mShouldFadeInScrim = true;

        getSystemUiController().updateUiState(SystemUiController.UI_STATE_BASE_WINDOW,
                Themes.getAttrBoolean(this, R.attr.isWorkspaceDarkText));

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onCreate(savedInstanceState);
        }

        TraceHelper.endSection("Launcher-onCreate");
    }

    @Override
    public void onThemeChanged() {
        recreate();
    }

    public LauncherStateManager getStateManager() {
        return mStateManager;
    }

    protected void overrideTheme(boolean isDark, boolean supportsDarkText) {
        if (isDark) {
            setTheme(R.style.LauncherThemeDark);
        } else if (supportsDarkText) {
            setTheme(R.style.LauncherThemeDarkText);
        }
    }

    @Override
    public <T extends View> T findViewById(int id) {
        return mLauncherView.findViewById(id);
    }

    @Override
    public void onAppWidgetHostReset() {
        if (mAppWidgetHost != null) {
            mAppWidgetHost.startListening();
        }
    }

    private LauncherCallbacks mLauncherCallbacks;

    public void onInsetsChanged(Rect insets) {
        mDeviceProfile.updateInsets(insets);
        mDeviceProfile.layout(this, true /* notifyListeners */);
    }

    /**
     * Call this after onCreate to set or clear overlay.
     */
    public void setLauncherOverlay(LauncherOverlay overlay) {
        if (overlay != null) {
            overlay.setOverlayCallbacks(new LauncherOverlayCallbacksImpl());
        }
        mWorkspace.setLauncherOverlay(overlay);
    }

    public boolean setLauncherCallbacks(LauncherCallbacks callbacks) {
        mLauncherCallbacks = callbacks;
        return true;
    }

    @Override
    public void onLauncherProviderChanged() {
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onLauncherProviderChange();
        }
    }

    public boolean isDraggingEnabled() {
        // We prevent dragging when we are loading the workspace as it is possible to pick up a view
        // that is subsequently removed from the workspace in startBinding().
        return !isWorkspaceLoading();
    }

    public int getViewIdForItem(ItemInfo info) {
        // aapt-generated IDs have the high byte nonzero; clamp to the range under that.
        // This cast is safe as long as the id < 0x00FFFFFF
        // Since we jail all the dynamically generated views, there should be no clashes
        // with any other views.
        return (int) info.id;
    }

    public PopupDataProvider getPopupDataProvider() {
        return mPopupDataProvider;
    }

    /**
     * Returns whether we should delay spring loaded mode -- for shortcuts and widgets that have
     * a configuration step, this allows the proper animations to run after other transitions.
     */
    private long completeAdd(
            int requestCode, Intent intent, int appWidgetId, PendingRequestArgs info) {
        long screenId = info.screenId;
        if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
            // When the screen id represents an actual screen (as opposed to a rank) we make sure
            // that the drop page actually exists.
            screenId = ensurePendingDropLayoutExists(info.screenId);
        }

        switch (requestCode) {
            case REQUEST_CREATE_SHORTCUT:
                completeAddShortcut(intent, info.container, screenId, info.cellX, info.cellY, info);
                break;
            case REQUEST_CREATE_APPWIDGET:
                completeAddAppWidget(appWidgetId, info, null, null);
                break;
            case REQUEST_RECONFIGURE_APPWIDGET:
                completeRestoreAppWidget(appWidgetId, LauncherAppWidgetInfo.RESTORE_COMPLETED);
                break;
            case REQUEST_BIND_PENDING_APPWIDGET: {
                int widgetId = appWidgetId;
                LauncherAppWidgetInfo widgetInfo =
                        completeRestoreAppWidget(widgetId, LauncherAppWidgetInfo.FLAG_UI_NOT_READY);
                if (widgetInfo != null) {
                    // Since the view was just bound, also launch the configure activity if needed
                    LauncherAppWidgetProviderInfo provider = mAppWidgetManager
                            .getLauncherAppWidgetInfo(widgetId);
                    if (provider != null) {
                        new WidgetAddFlowHandler(provider)
                                .startConfigActivity(this, widgetInfo, REQUEST_RECONFIGURE_APPWIDGET);
                    }
                }
                break;
            }
        }

        return screenId;
    }

    private void handleActivityResult(
            final int requestCode, final int resultCode, final Intent data) {
        if (isWorkspaceLoading()) {
            // process the result once the workspace has loaded.
            mPendingActivityResult = new ActivityResultInfo(requestCode, resultCode, data);
            return;
        }
        mPendingActivityResult = null;

        // Reset the startActivity waiting flag
        final PendingRequestArgs requestArgs = mPendingRequestArgs;
        setWaitingForResult(null);
        if (requestArgs == null) {
            return;
        }

        final int pendingAddWidgetId = requestArgs.getWidgetId();

        Runnable exitSpringLoaded = new Runnable() {
            @Override
            public void run() {
                mStateManager.goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
            }
        };

        if (requestCode == REQUEST_BIND_APPWIDGET) {
            // This is called only if the user did not previously have permissions to bind widgets
            final int appWidgetId = data != null ?
                    data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1) : -1;
            if (resultCode == RESULT_CANCELED) {
                completeTwoStageWidgetDrop(RESULT_CANCELED, appWidgetId, requestArgs);
                mWorkspace.removeExtraEmptyScreenDelayed(true, exitSpringLoaded,
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY, false);
            } else if (resultCode == RESULT_OK) {
                addAppWidgetImpl(
                        appWidgetId, requestArgs, null,
                        requestArgs.getWidgetHandler(),
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY);
            }
            return;
        } else if (requestCode == REQUEST_PICK_WALLPAPER) {
            if (resultCode == RESULT_OK && isInState(OVERVIEW)) {
                // User could have free-scrolled between pages before picking a wallpaper; make sure
                // we move to the closest one now.
                mWorkspace.setCurrentPage(mWorkspace.getPageNearestToCenterOfScreen());
                mStateManager.goToState(NORMAL, false);
            }
            return;
        }

        boolean isWidgetDrop = (requestCode == REQUEST_PICK_APPWIDGET ||
                requestCode == REQUEST_CREATE_APPWIDGET);

        // We have special handling for widgets
        if (isWidgetDrop) {
            final int appWidgetId;
            int widgetId = data != null ? data.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1)
                    : -1;
            if (widgetId < 0) {
                appWidgetId = pendingAddWidgetId;
            } else {
                appWidgetId = widgetId;
            }

            final int result;
            if (appWidgetId < 0 || resultCode == RESULT_CANCELED) {
                Log.e(TAG, "Error: appWidgetId (EXTRA_APPWIDGET_ID) was not " +
                        "returned from the widget configuration activity.");
                result = RESULT_CANCELED;
                completeTwoStageWidgetDrop(result, appWidgetId, requestArgs);
                final Runnable onComplete = new Runnable() {
                    @Override
                    public void run() {
                        getStateManager().goToState(NORMAL);
                    }
                };

                mWorkspace.removeExtraEmptyScreenDelayed(true, onComplete,
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY, false);
            } else {
                if (requestArgs.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
                    // When the screen id represents an actual screen (as opposed to a rank)
                    // we make sure that the drop page actually exists.
                    requestArgs.screenId =
                            ensurePendingDropLayoutExists(requestArgs.screenId);
                }
                final CellLayout dropLayout =
                        mWorkspace.getScreenWithId(requestArgs.screenId);

                dropLayout.setDropPending(true);
                final Runnable onComplete = new Runnable() {
                    @Override
                    public void run() {
                        completeTwoStageWidgetDrop(resultCode, appWidgetId, requestArgs);
                        dropLayout.setDropPending(false);
                    }
                };
                mWorkspace.removeExtraEmptyScreenDelayed(true, onComplete,
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY, false);
            }
            return;
        }

        if (requestCode == REQUEST_RECONFIGURE_APPWIDGET
                || requestCode == REQUEST_BIND_PENDING_APPWIDGET) {
            if (resultCode == RESULT_OK) {
                // Update the widget view.
                completeAdd(requestCode, data, pendingAddWidgetId, requestArgs);
            }
            // Leave the widget in the pending state if the user canceled the configure.
            return;
        }

        if (requestCode == REQUEST_CREATE_SHORTCUT) {
            // Handle custom shortcuts created using ACTION_CREATE_SHORTCUT.
            if (resultCode == RESULT_OK && requestArgs.container != ItemInfo.NO_ID) {
                completeAdd(requestCode, data, -1, requestArgs);
                mWorkspace.removeExtraEmptyScreenDelayed(true, exitSpringLoaded,
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY, false);

            } else if (resultCode == RESULT_CANCELED) {
                mWorkspace.removeExtraEmptyScreenDelayed(true, exitSpringLoaded,
                        ON_ACTIVITY_RESULT_ANIMATION_DELAY, false);
            }
        }
        mDragLayer.clearAnimatedView();
    }

    @Override
    public void onActivityResult(
            final int requestCode, final int resultCode, final Intent data) {
        handleActivityResult(requestCode, resultCode, data);
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onActivityResult(requestCode, resultCode, data);
        }
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions,
            int[] grantResults) {
        PendingRequestArgs pendingArgs = mPendingRequestArgs;
        if (requestCode == REQUEST_PERMISSION_CALL_PHONE && pendingArgs != null
                && pendingArgs.getRequestCode() == REQUEST_PERMISSION_CALL_PHONE) {
            setWaitingForResult(null);

            View v = null;
            CellLayout layout = getCellLayout(pendingArgs.container, pendingArgs.screenId);
            if (layout != null) {
                v = layout.getChildAt(pendingArgs.cellX, pendingArgs.cellY);
            }
            Intent intent = pendingArgs.getPendingIntent();

            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                startActivitySafely(v, intent, null);
            } else {
                // TODO: Show a snack bar with link to settings
                Toast.makeText(this, getString(R.string.msg_no_phone_permission,
                        getString(R.string.derived_app_name)), Toast.LENGTH_SHORT).show();
            }
        }
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onRequestPermissionsResult(requestCode, permissions,
                    grantResults);
        }
    }

    /**
     * Check to see if a given screen id exists. If not, create it at the end, return the new id.
     *
     * @param screenId the screen id to check
     * @return the new screen, or screenId if it exists
     */
    private long ensurePendingDropLayoutExists(long screenId) {
        CellLayout dropLayout = mWorkspace.getScreenWithId(screenId);
        if (dropLayout == null) {
            // it's possible that the add screen was removed because it was
            // empty and a re-bind occurred
            mWorkspace.addExtraEmptyScreen();
            return mWorkspace.commitExtraEmptyScreen();
        } else {
            return screenId;
        }
    }

    @Thunk void completeTwoStageWidgetDrop(
            final int resultCode, final int appWidgetId, final PendingRequestArgs requestArgs) {
        CellLayout cellLayout = mWorkspace.getScreenWithId(requestArgs.screenId);
        Runnable onCompleteRunnable = null;
        int animationType = 0;

        AppWidgetHostView boundWidget = null;
        if (resultCode == RESULT_OK) {
            animationType = Workspace.COMPLETE_TWO_STAGE_WIDGET_DROP_ANIMATION;
            final AppWidgetHostView layout = mAppWidgetHost.createView(this, appWidgetId,
                    requestArgs.getWidgetHandler().getProviderInfo(this));
            boundWidget = layout;
            onCompleteRunnable = new Runnable() {
                @Override
                public void run() {
                    completeAddAppWidget(appWidgetId, requestArgs, layout, null);
                    mStateManager.goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
                }
            };
        } else if (resultCode == RESULT_CANCELED) {
            mAppWidgetHost.deleteAppWidgetId(appWidgetId);
            animationType = Workspace.CANCEL_TWO_STAGE_WIDGET_DROP_ANIMATION;
        }
        if (mDragLayer.getAnimatedView() != null) {
            mWorkspace.animateWidgetDrop(requestArgs, cellLayout,
                    (DragView) mDragLayer.getAnimatedView(), onCompleteRunnable,
                    animationType, boundWidget, true);
        } else if (onCompleteRunnable != null) {
            // The animated view may be null in the case of a rotation during widget configuration
            onCompleteRunnable.run();
        }
    }

    @Override
    protected void onStop() {
        super.onStop();
        FirstFrameAnimatorHelper.setIsVisible(false);

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onStop();
        }

        if (Utilities.ATLEAST_NOUGAT_MR1) {
            mAppWidgetHost.stopListening();
        }

        if (!mAppLaunchSuccess) {
            getUserEventDispatcher().logActionCommand(Action.Command.STOP,
                    mStateManager.getState().containerType);
        }
        NotificationListener.removeNotificationsChangedListener();
    }

    @Override
    protected void onStart() {
        super.onStart();
        FirstFrameAnimatorHelper.setIsVisible(true);

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onStart();
        }

        if (Utilities.ATLEAST_NOUGAT_MR1) {
            mAppWidgetHost.startListening();
        }

        if (!isWorkspaceLoading()) {
            NotificationListener.setNotificationsChangedListener(mPopupDataProvider);
        }

        if (mShouldFadeInScrim && mDragLayer.getBackground() != null) {
            if (mScrimAnimator != null) {
                mScrimAnimator.cancel();
            }
            mDragLayer.getBackground().setAlpha(0);
            mScrimAnimator = ObjectAnimator.ofInt(mDragLayer.getBackground(),
                    LauncherAnimUtils.DRAWABLE_ALPHA, 0, 255);
            mScrimAnimator.addListener(new AnimatorListenerAdapter() {
                @Override
                public void onAnimationEnd(Animator animation) {
                    mScrimAnimator = null;
                }
            });
            mScrimAnimator.setDuration(600);
            mScrimAnimator.setStartDelay(getWindow().getTransitionBackgroundFadeDuration());
            mScrimAnimator.start();
        }
        mShouldFadeInScrim = false;
    }

    @Override
    protected void onResume() {
        TraceHelper.beginSection("ON_RESUME");
        super.onResume();
        TraceHelper.partitionSection("ON_RESUME", "superCall");

        mAppLaunchSuccess = false;
        getUserEventDispatcher().resetElapsedSessionMillis();
        mPaused = false;
        if (mOnResumeNeedsLoad) {
            setWorkspaceLoading(true);
            mModel.startLoader(getCurrentWorkspaceScreen());
            mOnResumeNeedsLoad = false;
        }
        if (mBindOnResumeCallbacks.size() > 0) {
            // We might have postponed some bind calls until onResume (see waitUntilResume) --
            // execute them here
            for (int i = 0; i < mBindOnResumeCallbacks.size(); i++) {
                mBindOnResumeCallbacks.get(i).run();
            }
            mBindOnResumeCallbacks.clear();
        }

        setOnResumeCallback(null);
        // Process any items that were added while Launcher was away.
        InstallShortcutReceiver.disableAndFlushInstallQueue(
                InstallShortcutReceiver.FLAG_ACTIVITY_PAUSED, this);

        // Refresh shortcuts if the permission changed.
        mModel.refreshShortcutsIfRequired();

        if (shouldShowDiscoveryBounce()) {
            mAllAppsController.showDiscoveryBounce();
        }
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onResume();
        }

        clearTypedText();

        TraceHelper.endSection("ON_RESUME");
    }

    @Override
    protected void onPause() {
        // Ensure that items added to Launcher are queued until Launcher returns
        InstallShortcutReceiver.enableInstallQueue(InstallShortcutReceiver.FLAG_ACTIVITY_PAUSED);

        super.onPause();
        mPaused = true;
        mDragController.cancelDrag();
        mDragController.resetLastGestureUpTime();

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onPause();
        }
    }

    public interface LauncherOverlay {

        /**
         * Touch interaction leading to overscroll has begun
         */
        void onScrollInteractionBegin();

        /**
         * Touch interaction related to overscroll has ended
         */
        void onScrollInteractionEnd();

        /**
         * Scroll progress, between 0 and 100, when the user scrolls beyond the leftmost
         * screen (or in the case of RTL, the rightmost screen).
         */
        void onScrollChange(float progress, boolean rtl);

        /**
         * Called when the launcher is ready to use the overlay
         * @param callbacks A set of callbacks provided by Launcher in relation to the overlay
         */
        void setOverlayCallbacks(LauncherOverlayCallbacks callbacks);
    }

    public interface LauncherOverlayCallbacks {
        void onScrollChanged(float progress);
    }

    class LauncherOverlayCallbacksImpl implements LauncherOverlayCallbacks {

        public void onScrollChanged(float progress) {
            if (mWorkspace != null) {
                mWorkspace.onOverlayScrollChanged(progress);
            }
        }
    }

    public boolean hasSettings() {
        if (mLauncherCallbacks != null) {
            return mLauncherCallbacks.hasSettings();
        } else {
            // On O and above we there is always some setting present settings (add icon to
            // home screen or icon badging). On earlier APIs we will have the allow rotation
            // setting, on devices with a locked orientation,
            return Utilities.ATLEAST_OREO || !getResources().getBoolean(R.bool.allow_rotation);
        }
    }

    @Override
    public Object onRetainNonConfigurationInstance() {
        // Flag the loader to stop early before switching
        if (mModel.isCurrentCallbacks(this)) {
            mModel.stopLoader();
        }
        //TODO(hyunyoungs): stop the widgets loader when there is a rotation.

        return Boolean.TRUE;
    }

    // We can't hide the IME if it was forced open.  So don't bother
    @Override
    public void onWindowFocusChanged(boolean hasFocus) {
        super.onWindowFocusChanged(hasFocus);
        mHasFocus = hasFocus;

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onWindowFocusChanged(hasFocus);
        }
    }

    private boolean acceptFilter() {
        final InputMethodManager inputManager = (InputMethodManager)
                getSystemService(Context.INPUT_METHOD_SERVICE);
        return !inputManager.isFullscreenMode();
    }

    @Override
    public boolean onKeyDown(int keyCode, KeyEvent event) {
        final int uniChar = event.getUnicodeChar();
        final boolean handled = super.onKeyDown(keyCode, event);
        final boolean isKeyNotWhitespace = uniChar > 0 && !Character.isWhitespace(uniChar);
        if (!handled && acceptFilter() && isKeyNotWhitespace) {
            boolean gotKey = TextKeyListener.getInstance().onKeyDown(mWorkspace, mDefaultKeySsb,
                    keyCode, event);
            if (gotKey && mDefaultKeySsb != null && mDefaultKeySsb.length() > 0) {
                // something usable has been typed - start a search
                // the typed text will be retrieved and cleared by
                // showSearchDialog()
                // If there are multiple keystrokes before the search dialog takes focus,
                // onSearchRequested() will be called for every keystroke,
                // but it is idempotent, so it's fine.
                return onSearchRequested();
            }
        }

        // Eat the long press event so the keyboard doesn't come up.
        if (keyCode == KeyEvent.KEYCODE_MENU && event.isLongPress()) {
            return true;
        }

        return handled;
    }

    private String getTypedText() {
        return mDefaultKeySsb.toString();
    }

    @Override
    public void clearTypedText() {
        mDefaultKeySsb.clear();
        mDefaultKeySsb.clearSpans();
        Selection.setSelection(mDefaultKeySsb, 0);
    }

    public boolean isInState(LauncherState state) {
        return mStateManager.getState() == state;
    }

    /**
     * Restores the previous state, if it exists.
     *
     * @param savedState The previous state.
     */
    private void restoreState(Bundle savedState) {
        if (savedState == null) {
            return;
        }

        int stateOrdinal = savedState.getInt(RUNTIME_STATE, NORMAL.ordinal);
        LauncherState[] stateValues = LauncherState.values();
        LauncherState state = stateValues[stateOrdinal];
        if (!state.doNotRestore) {
            mStateManager.goToState(state, false /* animated */);
        }

        PendingRequestArgs requestArgs = savedState.getParcelable(RUNTIME_STATE_PENDING_REQUEST_ARGS);
        if (requestArgs != null) {
            setWaitingForResult(requestArgs);
        }

        mPendingActivityResult = savedState.getParcelable(RUNTIME_STATE_PENDING_ACTIVITY_RESULT);

        SparseArray<Parcelable> widgetsState =
                savedState.getSparseParcelableArray(RUNTIME_STATE_WIDGET_PANEL);
        if (widgetsState != null) {
            WidgetsFullSheet.show(this, false).restoreHierarchyState(widgetsState);
        }
    }

    /**
     * Finds all the views we need and configure them properly.
     */
    private void setupViews() {
        mDragLayer = (DragLayer) findViewById(R.id.drag_layer);
        mFocusHandler = mDragLayer.getFocusIndicatorHelper();
        mWorkspace = mDragLayer.findViewById(R.id.workspace);
        mWorkspace.initParentViews(mDragLayer);
        mOverviewPanel = findViewById(R.id.overview_panel);

        mLauncherView.setSystemUiVisibility(View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE);

        // Setup the drag layer
        mDragLayer.setup(this, mDragController, mAllAppsController);

        // Setup the hotseat
        mHotseat = (Hotseat) findViewById(R.id.hotseat);
        if (mHotseat != null) {
            mHotseat.setOnLongClickListener(this);
        }

        // Setup the workspace
        mWorkspace.setHapticFeedbackEnabled(false);
        mWorkspace.setOnLongClickListener(this);
        mWorkspace.setup(mDragController);
        // Until the workspace is bound, ensure that we keep the wallpaper offset locked to the
        // default state, otherwise we will update to the wrong offsets in RTL
        mWorkspace.lockWallpaperToDefaultPage();
        mWorkspace.bindAndInitFirstWorkspaceScreen(null /* recycled qsb */);
        mDragController.addDragListener(mWorkspace);

        // Get the search/delete/uninstall bar
        mDropTargetBar = mDragLayer.findViewById(R.id.drop_target_bar);

        // Setup Apps
        mAppsView = findViewById(R.id.apps_view);

        // Setup the drag controller (drop targets have to be added in reverse order in priority)
        mDragController.setMoveTarget(mWorkspace);
        mDragController.addDropTarget(mWorkspace);
        mDropTargetBar.setup(mDragController);

        mAllAppsController.setupViews(mAppsView, mHotseat, mWorkspace);
    }

    /**
     * Sets the all apps button. This method is called from {@link Hotseat}.
     * TODO: Get rid of this.
     */
    public void setAllAppsButton(View allAppsButton) {
        mAllAppsButton = allAppsButton;
    }

    /**
     * Creates a view representing a shortcut.
     *
     * @param info The data structure describing the shortcut.
     */
    View createShortcut(ShortcutInfo info) {
        return createShortcut((ViewGroup) mWorkspace.getChildAt(mWorkspace.getCurrentPage()), info);
    }

    /**
     * Creates a view representing a shortcut inflated from the specified resource.
     *
     * @param parent The group the shortcut belongs to.
     * @param info The data structure describing the shortcut.
     *
     * @return A View inflated from layoutResId.
     */
    public View createShortcut(ViewGroup parent, ShortcutInfo info) {
        BubbleTextView favorite = (BubbleTextView) LayoutInflater.from(parent.getContext())
                .inflate(R.layout.app_icon, parent, false);
        favorite.applyFromShortcutInfo(info);
        favorite.setOnClickListener(this);
        favorite.setOnFocusChangeListener(mFocusHandler);
        return favorite;
    }

    /**
     * Add a shortcut to the workspace or to a Folder.
     *
     * @param data The intent describing the shortcut.
     */
    private void completeAddShortcut(Intent data, long container, long screenId, int cellX,
            int cellY, PendingRequestArgs args) {
        if (args.getRequestCode() != REQUEST_CREATE_SHORTCUT
                || args.getPendingIntent().getComponent() == null) {
            return;
        }

        int[] cellXY = mTmpAddItemCellCoordinates;
        CellLayout layout = getCellLayout(container, screenId);

        ShortcutInfo info = null;
        if (Utilities.ATLEAST_OREO) {
            info = LauncherAppsCompatVO.createShortcutInfoFromPinItemRequest(
                    this, LauncherAppsCompatVO.getPinItemRequest(data), 0);
        }

        if (info == null) {
            // Legacy shortcuts are only supported for primary profile.
            info = Process.myUserHandle().equals(args.user)
                    ? InstallShortcutReceiver.fromShortcutIntent(this, data) : null;

            if (info == null) {
                Log.e(TAG, "Unable to parse a valid custom shortcut result");
                return;
            } else if (!new PackageManagerHelper(this).hasPermissionForActivity(
                    info.intent, args.getPendingIntent().getComponent().getPackageName())) {
                // The app is trying to add a shortcut without sufficient permissions
                Log.e(TAG, "Ignoring malicious intent " + info.intent.toUri(0));
                return;
            }
        }

        if (container < 0) {
            // Adding a shortcut to the Workspace.
            final View view = createShortcut(info);
            boolean foundCellSpan = false;
            // First we check if we already know the exact location where we want to add this item.
            if (cellX >= 0 && cellY >= 0) {
                cellXY[0] = cellX;
                cellXY[1] = cellY;
                foundCellSpan = true;

                // If appropriate, either create a folder or add to an existing folder
                if (mWorkspace.createUserFolderIfNecessary(view, container, layout, cellXY, 0,
                        true, null)) {
                    return;
                }
                DragObject dragObject = new DragObject();
                dragObject.dragInfo = info;
                if (mWorkspace.addToExistingFolderIfNecessary(view, layout, cellXY, 0, dragObject,
                        true)) {
                    return;
                }
            } else {
                foundCellSpan = layout.findCellForSpan(cellXY, 1, 1);
            }

            if (!foundCellSpan) {
                mWorkspace.onNoCellFound(layout);
                return;
            }

            getModelWriter().addItemToDatabase(info, container, screenId, cellXY[0], cellXY[1]);
            mWorkspace.addInScreen(view, info);
        } else {
            // Adding a shortcut to a Folder.
            FolderIcon folderIcon = findFolderIcon(container);
            if (folderIcon != null) {
                FolderInfo folderInfo = (FolderInfo) folderIcon.getTag();
                folderInfo.add(info, args.rank, false);
            } else {
                Log.e(TAG, "Could not find folder with id " + container + " to add shortcut.");
            }
        }
    }

    public FolderIcon findFolderIcon(final long folderIconId) {
        return (FolderIcon) mWorkspace.getFirstMatch(new ItemOperator() {
            @Override
            public boolean evaluate(ItemInfo info, View view) {
                return info != null && info.id == folderIconId;
            }
        });
    }

    /**
     * Add a widget to the workspace.
     *
     * @param appWidgetId The app widget id
     */
    @Thunk void completeAddAppWidget(int appWidgetId, ItemInfo itemInfo,
            AppWidgetHostView hostView, LauncherAppWidgetProviderInfo appWidgetInfo) {

        if (appWidgetInfo == null) {
            appWidgetInfo = mAppWidgetManager.getLauncherAppWidgetInfo(appWidgetId);
        }

        LauncherAppWidgetInfo launcherInfo;
        launcherInfo = new LauncherAppWidgetInfo(appWidgetId, appWidgetInfo.provider);
        launcherInfo.spanX = itemInfo.spanX;
        launcherInfo.spanY = itemInfo.spanY;
        launcherInfo.minSpanX = itemInfo.minSpanX;
        launcherInfo.minSpanY = itemInfo.minSpanY;
        launcherInfo.user = appWidgetInfo.getProfile();

        getModelWriter().addItemToDatabase(launcherInfo,
                itemInfo.container, itemInfo.screenId, itemInfo.cellX, itemInfo.cellY);

        if (hostView == null) {
            // Perform actual inflation because we're live
            hostView = mAppWidgetHost.createView(this, appWidgetId, appWidgetInfo);
        }
        hostView.setVisibility(View.VISIBLE);
        prepareAppWidget(hostView, launcherInfo);
        mWorkspace.addInScreen(hostView, launcherInfo);
    }

    private void prepareAppWidget(AppWidgetHostView hostView, LauncherAppWidgetInfo item) {
        hostView.setTag(item);
        item.onBindAppWidget(this, hostView);
        hostView.setFocusable(true);
        hostView.setOnFocusChangeListener(mFocusHandler);
    }

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            final String action = intent.getAction();
            if (Intent.ACTION_SCREEN_OFF.equals(action)) {
                // Reset AllApps to its initial state only if we are not in the middle of
                // processing a multi-step drop
                if (mAppsView != null && mPendingRequestArgs == null) {
                    mStateManager.goToState(NORMAL);
                }
                mShouldFadeInScrim = true;
            } else if (Intent.ACTION_USER_PRESENT.equals(action)) {
                // ACTION_USER_PRESENT is sent after onStart/onResume. This covers the case where
                // the user unlocked and the Launcher is not in the foreground.
                mShouldFadeInScrim = false;
            }
        }
    };

    public void updateIconBadges(final Set<PackageUserKey> updatedBadges) {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                mWorkspace.updateIconBadges(updatedBadges);
                mAppsView.updateIconBadges(updatedBadges);

                BaseActionPopup popup = BaseActionPopup.getOpen(Launcher.this);
                if (popup instanceof PopupContainerWithArrow) {
                    ((PopupContainerWithArrow) popup).updateNotificationHeader(updatedBadges);
                }
            }
        };
        if (!waitUntilResume(r)) {
            r.run();
        }
    }

    @Override
    public void onAttachedToWindow() {
        super.onAttachedToWindow();

        FirstFrameAnimatorHelper.initializeDrawListener(getWindow().getDecorView());
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onAttachedToWindow();
        }
    }

    @Override
    public void onDetachedFromWindow() {
        super.onDetachedFromWindow();

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onDetachedFromWindow();
        }
    }

    public AllAppsTransitionController getAllAppsController() {
        return mAllAppsController;
    }

    public DragLayer getDragLayer() {
        return mDragLayer;
    }

    public AllAppsContainerView getAppsView() {
        return mAppsView;
    }

    public Workspace getWorkspace() {
        return mWorkspace;
    }

    public Hotseat getHotseat() {
        return mHotseat;
    }

    public <T extends ViewGroup> T getOverviewPanel() {
        return (T) mOverviewPanel;
    }

    public DropTargetBar getDropTargetBar() {
        return mDropTargetBar;
    }

    public LauncherAppWidgetHost getAppWidgetHost() {
        return mAppWidgetHost;
    }

    public LauncherModel getModel() {
        return mModel;
    }

    public ModelWriter getModelWriter() {
        return mModelWriter;
    }

    public SharedPreferences getSharedPrefs() {
        return mSharedPrefs;
    }

    public int getOrientation() { return mOrientation; }

    @Override
    protected void onNewIntent(Intent intent) {
        TraceHelper.beginSection("NEW_INTENT");
        super.onNewIntent(intent);

        boolean alreadyOnHome = mHasFocus && ((intent.getFlags() &
                Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT)
                != Intent.FLAG_ACTIVITY_BROUGHT_TO_FRONT);

        // Check this condition before handling isActionMain, as this will get reset.
        boolean shouldMoveToDefaultScreen = alreadyOnHome && isInState(NORMAL)
                && AbstractFloatingView.getTopOpenView(this) == null;

        boolean isActionMain = Intent.ACTION_MAIN.equals(intent.getAction());
        if (isActionMain) {
            if (mWorkspace == null) {
                // Can be cases where mWorkspace is null, this prevents a NPE
                return;
            }

            // Note: There should be at most one log per method call. This is enforced implicitly
            // by using if-else statements.
            UserEventDispatcher ued = getUserEventDispatcher();
            AbstractFloatingView topOpenView = AbstractFloatingView.getTopOpenView(this);
            if (topOpenView != null) {
                topOpenView.logActionCommand(Action.Command.HOME_INTENT);
            } else if (alreadyOnHome) {
                Target target = newContainerTarget(mStateManager.getState().containerType);
                target.pageIndex = mWorkspace.getCurrentPage();
                ued.logActionCommand(Action.Command.HOME_INTENT, target);
            }

            // In all these cases, only animate if we're already on home
            AbstractFloatingView.closeAllOpenViews(this, alreadyOnHome);
            mStateManager.goToState(NORMAL, alreadyOnHome /* animated */);

            final View v = getWindow().peekDecorView();
            if (v != null && v.getWindowToken() != null) {
                UiThreadHelper.hideKeyboardAsync(this, v.getWindowToken());
            }

            // Reset the apps view
            if (!alreadyOnHome && mAppsView != null) {
                mAppsView.reset();
            }

            if (mLauncherCallbacks != null) {
                mLauncherCallbacks.onHomeIntent();
            }
        }
        PinItemDragListener.handleDragRequest(this, intent);

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onNewIntent(intent);
        }

        // Defer moving to the default screen until after we callback to the LauncherCallbacks
        // as slow logic in the callbacks eat into the time the scroller expects for the snapToPage
        // animation.
        if (isActionMain) {
            if (shouldMoveToDefaultScreen && !mWorkspace.isTouchActive()) {

                mWorkspace.post(new Runnable() {
                    @Override
                    public void run() {
                        if (mWorkspace != null) {
                            mWorkspace.moveToDefaultScreen();
                        }
                    }
                });
            }
        }
        InternalStateHandler.handleIntent(this, intent);

        TraceHelper.endSection("NEW_INTENT");
    }

    @Override
    public void onRestoreInstanceState(Bundle state) {
        super.onRestoreInstanceState(state);
        for (int page: mSynchronouslyBoundPages) {
            mWorkspace.restoreInstanceStateForChild(page);
        }
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        if (mWorkspace.getChildCount() > 0) {
            outState.putInt(RUNTIME_STATE_CURRENT_SCREEN, mWorkspace.getNextPage());

        }
        outState.putInt(RUNTIME_STATE, mStateManager.getState().ordinal);


        AbstractFloatingView widgets = AbstractFloatingView
                .getOpenView(this, AbstractFloatingView.TYPE_WIDGETS_FULL_SHEET);
        if (widgets != null) {
            SparseArray<Parcelable> widgetsState = new SparseArray<>();
            widgets.saveHierarchyState(widgetsState);
            outState.putSparseParcelableArray(RUNTIME_STATE_WIDGET_PANEL, widgetsState);
        } else {
            outState.remove(RUNTIME_STATE_WIDGET_PANEL);
        }

        // We close any open folders and shortcut containers since they will not be re-opened,
        // and we need to make sure this state is reflected.
        AbstractFloatingView.closeAllOpenViews(this, false);

        if (mPendingRequestArgs != null) {
            outState.putParcelable(RUNTIME_STATE_PENDING_REQUEST_ARGS, mPendingRequestArgs);
        }
        if (mPendingActivityResult != null) {
            outState.putParcelable(RUNTIME_STATE_PENDING_ACTIVITY_RESULT, mPendingActivityResult);
        }

        super.onSaveInstanceState(outState);

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onSaveInstanceState(outState);
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();

        unregisterReceiver(mReceiver);
        mWorkspace.removeFolderListeners();

        // Stop callbacks from LauncherModel
        // It's possible to receive onDestroy after a new Launcher activity has
        // been created. In this case, don't interfere with the new Launcher.
        if (mModel.isCurrentCallbacks(this)) {
            mModel.stopLoader();
            LauncherAppState.getInstance(this).setLauncher(null);
        }

        if (mRotationPrefChangeHandler != null) {
            mSharedPrefs.unregisterOnSharedPreferenceChangeListener(mRotationPrefChangeHandler);
        }

        try {
            mAppWidgetHost.stopListening();
        } catch (NullPointerException ex) {
            Log.w(TAG, "problem while stopping AppWidgetHost during Launcher destruction", ex);
        }
        mAppWidgetHost = null;

        TextKeyListener.getInstance().release();
        WallpaperColorInfo.getInstance(this).setOnThemeChangeListener(null);

        LauncherAnimUtils.onDestroyActivity();

        clearPendingBinds();

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onDestroy();
        }
    }

    public LauncherAccessibilityDelegate getAccessibilityDelegate() {
        return mAccessibilityDelegate;
    }

    public DragController getDragController() {
        return mDragController;
    }

    @Override
    public void startActivityForResult(Intent intent, int requestCode, Bundle options) {
        super.startActivityForResult(intent, requestCode, options);
    }

    @Override
    public void startIntentSenderForResult (IntentSender intent, int requestCode,
            Intent fillInIntent, int flagsMask, int flagsValues, int extraFlags, Bundle options) {
        try {
            super.startIntentSenderForResult(intent, requestCode,
                fillInIntent, flagsMask, flagsValues, extraFlags, options);
        } catch (IntentSender.SendIntentException e) {
            throw new ActivityNotFoundException();
        }
    }

    /**
     * Indicates that we want global search for this activity by setting the globalSearch
     * argument for {@link #startSearch} to true.
     */
    @Override
    public void startSearch(String initialQuery, boolean selectInitialQuery,
            Bundle appSearchData, boolean globalSearch) {

        if (initialQuery == null) {
            // Use any text typed in the launcher as the initial query
            initialQuery = getTypedText();
        }
        if (appSearchData == null) {
            appSearchData = new Bundle();
            appSearchData.putString("source", "launcher-search");
        }

        if (mLauncherCallbacks == null ||
                !mLauncherCallbacks.startSearch(initialQuery, selectInitialQuery, appSearchData)) {
            // Starting search from the callbacks failed. Start the default global search.
            startGlobalSearch(initialQuery, selectInitialQuery, appSearchData, null);
        }

        // We need to show the workspace after starting the search
        mStateManager.goToState(NORMAL);
    }

    /**
     * Starts the global search activity. This code is a copied from SearchManager
     */
    public void startGlobalSearch(String initialQuery,
            boolean selectInitialQuery, Bundle appSearchData, Rect sourceBounds) {
        final SearchManager searchManager =
            (SearchManager) getSystemService(Context.SEARCH_SERVICE);
        ComponentName globalSearchActivity = searchManager.getGlobalSearchActivity();
        if (globalSearchActivity == null) {
            Log.w(TAG, "No global search activity found.");
            return;
        }
        Intent intent = new Intent(SearchManager.INTENT_ACTION_GLOBAL_SEARCH);
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        intent.setComponent(globalSearchActivity);
        // Make sure that we have a Bundle to put source in
        if (appSearchData == null) {
            appSearchData = new Bundle();
        } else {
            appSearchData = new Bundle(appSearchData);
        }
        // Set source to package name of app that starts global search if not set already.
        if (!appSearchData.containsKey("source")) {
            appSearchData.putString("source", getPackageName());
        }
        intent.putExtra(SearchManager.APP_DATA, appSearchData);
        if (!TextUtils.isEmpty(initialQuery)) {
            intent.putExtra(SearchManager.QUERY, initialQuery);
        }
        if (selectInitialQuery) {
            intent.putExtra(SearchManager.EXTRA_SELECT_QUERY, selectInitialQuery);
        }
        intent.setSourceBounds(sourceBounds);
        try {
            startActivity(intent);
        } catch (ActivityNotFoundException ex) {
            Log.e(TAG, "Global search activity not found: " + globalSearchActivity);
        }
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu menu) {
        super.onPrepareOptionsMenu(menu);
        if (mLauncherCallbacks != null) {
            return mLauncherCallbacks.onPrepareOptionsMenu(menu);
        }
        return false;
    }

    @Override
    public boolean onSearchRequested() {
        startSearch(null, false, null, true);
        // Use a custom animation for launching search
        return true;
    }

    public boolean isWorkspaceLocked() {
        return mWorkspaceLoading || mPendingRequestArgs != null;
    }

    public boolean isWorkspaceLoading() {
        return mWorkspaceLoading;
    }

    private void setWorkspaceLoading(boolean value) {
        mWorkspaceLoading = value;
    }

    public void setWaitingForResult(PendingRequestArgs args) {
        mPendingRequestArgs = args;
    }

    void addAppWidgetFromDropImpl(int appWidgetId, ItemInfo info, AppWidgetHostView boundWidget,
            WidgetAddFlowHandler addFlowHandler) {
        if (LOGD) {
            Log.d(TAG, "Adding widget from drop");
        }
        addAppWidgetImpl(appWidgetId, info, boundWidget, addFlowHandler, 0);
    }

    void addAppWidgetImpl(int appWidgetId, ItemInfo info,
            AppWidgetHostView boundWidget, WidgetAddFlowHandler addFlowHandler, int delay) {
        if (!addFlowHandler.startConfigActivity(this, appWidgetId, info, REQUEST_CREATE_APPWIDGET)) {
            // If the configuration flow was not started, add the widget

            Runnable onComplete = new Runnable() {
                @Override
                public void run() {
                    // Exit spring loaded mode if necessary after adding the widget
                    mStateManager.goToState(NORMAL, SPRING_LOADED_EXIT_DELAY);
                }
            };
            completeAddAppWidget(appWidgetId, info, boundWidget, addFlowHandler.getProviderInfo(this));
            mWorkspace.removeExtraEmptyScreenDelayed(true, onComplete, delay, false);
        }
    }

    public void addPendingItem(PendingAddItemInfo info, long container, long screenId,
            int[] cell, int spanX, int spanY) {
        info.container = container;
        info.screenId = screenId;
        if (cell != null) {
            info.cellX = cell[0];
            info.cellY = cell[1];
        }
        info.spanX = spanX;
        info.spanY = spanY;

        switch (info.itemType) {
            case LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET:
            case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
                addAppWidgetFromDrop((PendingAddWidgetInfo) info);
                break;
            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                processShortcutFromDrop((PendingAddShortcutInfo) info);
                break;
            default:
                throw new IllegalStateException("Unknown item type: " + info.itemType);
            }
    }

    /**
     * Process a shortcut drop.
     */
    private void processShortcutFromDrop(PendingAddShortcutInfo info) {
        Intent intent = new Intent(Intent.ACTION_CREATE_SHORTCUT).setComponent(info.componentName);
        setWaitingForResult(PendingRequestArgs.forIntent(REQUEST_CREATE_SHORTCUT, intent, info));
        if (!info.activityInfo.startConfigActivity(this, REQUEST_CREATE_SHORTCUT)) {
            handleActivityResult(REQUEST_CREATE_SHORTCUT, RESULT_CANCELED, null);
        }
    }

    /**
     * Process a widget drop.
     */
    private void addAppWidgetFromDrop(PendingAddWidgetInfo info) {
        AppWidgetHostView hostView = info.boundWidget;
        final int appWidgetId;
        WidgetAddFlowHandler addFlowHandler = info.getHandler();
        if (hostView != null) {
            // In the case where we've prebound the widget, we remove it from the DragLayer
            if (LOGD) {
                Log.d(TAG, "Removing widget view from drag layer and setting boundWidget to null");
            }
            getDragLayer().removeView(hostView);

            appWidgetId = hostView.getAppWidgetId();
            addAppWidgetFromDropImpl(appWidgetId, info, hostView, addFlowHandler);

            // Clear the boundWidget so that it doesn't get destroyed.
            info.boundWidget = null;
        } else {
            // In this case, we either need to start an activity to get permission to bind
            // the widget, or we need to start an activity to configure the widget, or both.
            if (FeatureFlags.ENABLE_CUSTOM_WIDGETS &&
                    info.itemType == LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET) {
                appWidgetId = CustomWidgetParser.getWidgetIdForCustomProvider(
                        this, info.componentName);
            } else {
                appWidgetId = getAppWidgetHost().allocateAppWidgetId();
            }
            Bundle options = info.bindOptions;

            boolean success = mAppWidgetManager.bindAppWidgetIdIfAllowed(
                    appWidgetId, info.info, options);
            if (success) {
                addAppWidgetFromDropImpl(appWidgetId, info, null, addFlowHandler);
            } else {
                addFlowHandler.startBindFlow(this, appWidgetId, info, REQUEST_BIND_APPWIDGET);
            }
        }
    }

    FolderIcon addFolder(CellLayout layout, long container, final long screenId, int cellX,
            int cellY) {
        final FolderInfo folderInfo = new FolderInfo();
        folderInfo.title = getText(R.string.folder_name);

        // Update the model
        getModelWriter().addItemToDatabase(folderInfo, container, screenId, cellX, cellY);

        // Create the view
        FolderIcon newFolder = FolderIcon.fromXml(R.layout.folder_icon, this, layout, folderInfo);
        mWorkspace.addInScreen(newFolder, folderInfo);
        // Force measure the new folder icon
        CellLayout parent = mWorkspace.getParentCellLayoutForView(newFolder);
        parent.getShortcutsAndWidgets().measureChild(newFolder);
        return newFolder;
    }

    /**
     * Unbinds the view for the specified item, and removes the item and all its children.
     *
     * @param v the view being removed.
     * @param itemInfo the {@link ItemInfo} for this view.
     * @param deleteFromDb whether or not to delete this item from the db.
     */
    public boolean removeItem(View v, final ItemInfo itemInfo, boolean deleteFromDb) {
        if (itemInfo instanceof ShortcutInfo) {
            // Remove the shortcut from the folder before removing it from launcher
            View folderIcon = mWorkspace.getHomescreenIconByItemId(itemInfo.container);
            if (folderIcon instanceof FolderIcon) {
                ((FolderInfo) folderIcon.getTag()).remove((ShortcutInfo) itemInfo, true);
            } else {
                mWorkspace.removeWorkspaceItem(v);
            }
            if (deleteFromDb) {
                getModelWriter().deleteItemFromDatabase(itemInfo);
            }
        } else if (itemInfo instanceof FolderInfo) {
            final FolderInfo folderInfo = (FolderInfo) itemInfo;
            if (v instanceof FolderIcon) {
                ((FolderIcon) v).removeListeners();
            }
            mWorkspace.removeWorkspaceItem(v);
            if (deleteFromDb) {
                getModelWriter().deleteFolderAndContentsFromDatabase(folderInfo);
            }
        } else if (itemInfo instanceof LauncherAppWidgetInfo) {
            final LauncherAppWidgetInfo widgetInfo = (LauncherAppWidgetInfo) itemInfo;
            mWorkspace.removeWorkspaceItem(v);
            if (deleteFromDb) {
                deleteWidgetInfo(widgetInfo);
            }
        } else {
            return false;
        }
        return true;
    }

    /**
     * Deletes the widget info and the widget id.
     */
    private void deleteWidgetInfo(final LauncherAppWidgetInfo widgetInfo) {
        final LauncherAppWidgetHost appWidgetHost = getAppWidgetHost();
        if (appWidgetHost != null && !widgetInfo.isCustomWidget() && widgetInfo.isWidgetIdAllocated()) {
            // Deleting an app widget ID is a void call but writes to disk before returning
            // to the caller...
            new AsyncTask<Void, Void, Void>() {
                public Void doInBackground(Void ... args) {
                    appWidgetHost.deleteAppWidgetId(widgetInfo.appWidgetId);
                    return null;
                }
            }.executeOnExecutor(Utilities.THREAD_POOL_EXECUTOR);
        }
        getModelWriter().deleteItemFromDatabase(widgetInfo);
    }

    @Override
    public boolean dispatchKeyEvent(KeyEvent event) {
        return (event.getKeyCode() == KeyEvent.KEYCODE_HOME) || super.dispatchKeyEvent(event);
    }

    @Override
    public void onBackPressed() {
        if (mLauncherCallbacks != null && mLauncherCallbacks.handleBackPressed()) {
            return;
        }

        if (mDragController.isDragging()) {
            mDragController.cancelDrag();
            return;
        }

        // Note: There should be at most one log per method call. This is enforced implicitly
        // by using if-else statements.
        UserEventDispatcher ued = getUserEventDispatcher();
        AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(this);
        if (topView != null) {
            topView.onBackPressed();
        } else if (!isInState(NORMAL)) {
            ued.logActionCommand(Action.Command.BACK, mStateManager.getState().containerType);
            mStateManager.goToState(NORMAL);
        } else {
            // Back button is a no-op here, but give at least some feedback for the button press
            mWorkspace.showOutlinesTemporarily();
        }
    }

    /**
     * Launches the intent referred by the clicked shortcut.
     *
     * @param v The view representing the clicked shortcut.
     */
    public void onClick(View v) {
        // Make sure that rogue clicks don't get through while allapps is launching, or after the
        // view has detached (it's possible for this to happen if the view is removed mid touch).
        if (v.getWindowToken() == null) {
            return;
        }

        if (!mWorkspace.isFinishedSwitchingState()) {
            return;
        }

        if (v instanceof Workspace) {
            if (isInState(OVERVIEW)) {
                getUserEventDispatcher().logActionOnContainer(LauncherLogProto.Action.Type.TOUCH,
                        LauncherLogProto.Action.Direction.NONE,
                        LauncherLogProto.ContainerType.OVERVIEW, mWorkspace.getCurrentPage());
                mStateManager.goToState(NORMAL);
            }
            return;
        }

        if (v instanceof CellLayout) {
            if (isInState(OVERVIEW)) {
                int page = mWorkspace.indexOfChild(v);
                getUserEventDispatcher().logActionOnContainer(LauncherLogProto.Action.Type.TOUCH,
                        LauncherLogProto.Action.Direction.NONE,
                        LauncherLogProto.ContainerType.OVERVIEW, page);
                mWorkspace.snapToPageFromOverView(page);
                mStateManager.goToState(NORMAL);
            }
            return;
        }

        Object tag = v.getTag();
        if (tag instanceof ShortcutInfo) {
            onClickAppShortcut(v);
        } else if (tag instanceof FolderInfo) {
            if (v instanceof FolderIcon) {
                onClickFolderIcon(v);
            }
        } else if ((v instanceof PageIndicator) ||
            (v == mAllAppsButton && mAllAppsButton != null)) {
            onClickAllAppsButton(v);
        } else if (tag instanceof AppInfo) {
            startAppShortcutOrInfoActivity(v);
        } else if (tag instanceof LauncherAppWidgetInfo) {
            if (v instanceof PendingAppWidgetHostView) {
                onClickPendingWidget((PendingAppWidgetHostView) v);
            }
        }
    }

    @SuppressLint("ClickableViewAccessibility")
    public boolean onTouch(View v, MotionEvent event) {
        return false;
    }

    /**
     * Event handler for the app widget view which has not fully restored.
     */
    public void onClickPendingWidget(final PendingAppWidgetHostView v) {
        if (mIsSafeModeEnabled) {
            Toast.makeText(this, R.string.safemode_widget_error, Toast.LENGTH_SHORT).show();
            return;
        }

        final LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) v.getTag();
        if (v.isReadyForClickSetup()) {
            LauncherAppWidgetProviderInfo appWidgetInfo =
                    mAppWidgetManager.findProvider(info.providerName, info.user);
            if (appWidgetInfo == null) {
                return;
            }
            WidgetAddFlowHandler addFlowHandler = new WidgetAddFlowHandler(appWidgetInfo);

            if (info.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_NOT_VALID)) {
                if (!info.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_ALLOCATED)) {
                    // This should not happen, as we make sure that an Id is allocated during bind.
                    return;
                }
                addFlowHandler.startBindFlow(this, info.appWidgetId, info,
                        REQUEST_BIND_PENDING_APPWIDGET);
            } else {
                addFlowHandler.startConfigActivity(this, info, REQUEST_RECONFIGURE_APPWIDGET);
            }
        } else {
            final String packageName = info.providerName.getPackageName();
            onClickPendingAppItem(v, packageName, info.installProgress >= 0);
        }
    }

    /**
     * Event handler for the "grid" button or "caret" that appears on the home screen, which
     * enters all apps mode. In verticalBarLayout the caret can be seen when all apps is open, and
     * so in that case reverses the action.
     *
     * @param v The view that was clicked.
     */
    protected void onClickAllAppsButton(View v) {
        if (LOGD) Log.d(TAG, "onClickAllAppsButton");
        if (!isInState(ALL_APPS)) {
            getUserEventDispatcher().logActionOnControl(Action.Touch.TAP,
                    ControlType.ALL_APPS_BUTTON);
            mStateManager.goToState(ALL_APPS);
        } else {
            mStateManager.goToState(NORMAL);
        }
    }

    private void onClickPendingAppItem(final View v, final String packageName,
            boolean downloadStarted) {
        if (downloadStarted) {
            // If the download has started, simply direct to the market app.
            startMarketIntentForPackage(v, packageName);
            return;
        }
        new AlertDialog.Builder(this)
            .setTitle(R.string.abandoned_promises_title)
            .setMessage(R.string.abandoned_promise_explanation)
            .setPositiveButton(R.string.abandoned_search, new DialogInterface.OnClickListener() {
                @Override
                public void onClick(DialogInterface dialogInterface, int i) {
                    startMarketIntentForPackage(v, packageName);
                }
            })
            .setNeutralButton(R.string.abandoned_clean_this,
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int id) {
                        final UserHandle user = Process.myUserHandle();
                        mWorkspace.removeAbandonedPromise(packageName, user);
                    }
                })
            .create().show();
    }

    private void startMarketIntentForPackage(View v, String packageName) {
        ItemInfo item = (ItemInfo) v.getTag();
        Intent intent = PackageManagerHelper.getMarketIntent(packageName);
        startActivitySafely(v, intent, item);
    }

    /**
     * Event handler for an app shortcut click.
     *
     * @param v The view that was clicked. Must be a tagged with a {@link ShortcutInfo}.
     */
    protected void onClickAppShortcut(final View v) {
        if (LOGD) Log.d(TAG, "onClickAppShortcut");
        Object tag = v.getTag();
        if (!(tag instanceof ShortcutInfo)) {
            throw new IllegalArgumentException("Input must be a Shortcut");
        }

        // Open shortcut
        final ShortcutInfo shortcut = (ShortcutInfo) tag;

        if (shortcut.isDisabled()) {
            if ((shortcut.runtimeStatusFlags &
                    ~FLAG_DISABLED_SUSPENDED &
                    ~FLAG_DISABLED_QUIET_USER) == 0) {
                // If the app is only disabled because of the above flags, launch activity anyway.
                // Framework will tell the user why the app is suspended.
            } else {
                if (!TextUtils.isEmpty(shortcut.disabledMessage)) {
                    // Use a message specific to this shortcut, if it has one.
                    Toast.makeText(this, shortcut.disabledMessage, Toast.LENGTH_SHORT).show();
                    return;
                }
                // Otherwise just use a generic error message.
                int error = R.string.activity_not_available;
                if ((shortcut.runtimeStatusFlags & FLAG_DISABLED_SAFEMODE) != 0) {
                    error = R.string.safemode_shortcut_error;
                } else if ((shortcut.runtimeStatusFlags & FLAG_DISABLED_BY_PUBLISHER) != 0 ||
                        (shortcut.runtimeStatusFlags & FLAG_DISABLED_LOCKED_USER) != 0) {
                    error = R.string.shortcut_not_available;
                }
                Toast.makeText(this, error, Toast.LENGTH_SHORT).show();
                return;
            }
        }

        // Check for abandoned promise
        if ((v instanceof BubbleTextView) && shortcut.hasPromiseIconUi()) {
            String packageName = shortcut.intent.getComponent() != null ?
                    shortcut.intent.getComponent().getPackageName() : shortcut.intent.getPackage();
            if (!TextUtils.isEmpty(packageName)) {
                onClickPendingAppItem(v, packageName,
                        shortcut.hasStatusFlag(ShortcutInfo.FLAG_INSTALL_SESSION_ACTIVE));
                return;
            }
        }

        // Start activities
        startAppShortcutOrInfoActivity(v);
    }

    private void startAppShortcutOrInfoActivity(View v) {
        ItemInfo item = (ItemInfo) v.getTag();
        Intent intent;
        if (item instanceof PromiseAppInfo) {
            PromiseAppInfo promiseAppInfo = (PromiseAppInfo) item;
            intent = promiseAppInfo.getMarketIntent();
        } else {
            intent = item.getIntent();
        }
        if (intent == null) {
            throw new IllegalArgumentException("Input must have a valid intent");
        }
        startActivitySafely(v, intent, item);
    }

    /**
     * Event handler for a folder icon click.
     *
     * @param v The view that was clicked. Must be an instance of {@link FolderIcon}.
     */
    protected void onClickFolderIcon(View v) {
        if (LOGD) Log.d(TAG, "onClickFolder");
        if (!(v instanceof FolderIcon)){
            throw new IllegalArgumentException("Input must be a FolderIcon");
        }

        Folder folder = ((FolderIcon) v).getFolder();
        if (!folder.isOpen() && !folder.isDestroyed()) {
            // Open the requested folder
            folder.animateOpen();
        }
    }

    /**
     * Event handler for the wallpaper picker button that appears after a long press
     * on the home screen.
     */
    public void onClickWallpaperPicker(View v) {
        if (!Utilities.isWallpaperAllowed(this)) {
            Toast.makeText(this, R.string.msg_disabled_by_admin, Toast.LENGTH_SHORT).show();
            return;
        }

        int pageScroll = mWorkspace.getScrollForPage(mWorkspace.getPageNearestToCenterOfScreen());
        float offset = mWorkspace.mWallpaperOffset.wallpaperOffsetForScroll(pageScroll);
        setWaitingForResult(new PendingRequestArgs(new ItemInfo()));
        Intent intent = new Intent(Intent.ACTION_SET_WALLPAPER)
                .putExtra(Utilities.EXTRA_WALLPAPER_OFFSET, offset);

        String pickerPackage = getString(R.string.wallpaper_picker_package);
        boolean hasTargetPackage = !TextUtils.isEmpty(pickerPackage);
        if (hasTargetPackage) {
            intent.setPackage(pickerPackage);
        }

        intent.setSourceBounds(getViewBounds(v));
        try {
            startActivityForResult(intent, REQUEST_PICK_WALLPAPER,
                    // If there is no target package, use the default intent chooser animation
                    hasTargetPackage ? getActivityLaunchOptions(v) : null);
        } catch (ActivityNotFoundException e) {
            setWaitingForResult(null);
            Toast.makeText(this, R.string.activity_not_found, Toast.LENGTH_SHORT).show();
        }
    }

    private void startShortcutIntentSafely(Intent intent, Bundle optsBundle, ItemInfo info) {
        try {
            StrictMode.VmPolicy oldPolicy = StrictMode.getVmPolicy();
            try {
                // Temporarily disable deathPenalty on all default checks. For eg, shortcuts
                // containing file Uri's would cause a crash as penaltyDeathOnFileUriExposure
                // is enabled by default on NYC.
                StrictMode.setVmPolicy(new StrictMode.VmPolicy.Builder().detectAll()
                        .penaltyLog().build());

                if (info.itemType == LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT) {
                    String id = ((ShortcutInfo) info).getDeepShortcutId();
                    String packageName = intent.getPackage();
                    DeepShortcutManager.getInstance(this).startShortcut(
                            packageName, id, intent.getSourceBounds(), optsBundle, info.user);
                } else {
                    // Could be launching some bookkeeping activity
                    startActivity(intent, optsBundle);
                }
            } finally {
                StrictMode.setVmPolicy(oldPolicy);
            }
        } catch (SecurityException e) {
            // Due to legacy reasons, direct call shortcuts require Launchers to have the
            // corresponding permission. Show the appropriate permission prompt if that
            // is the case.
            if (intent.getComponent() == null
                    && Intent.ACTION_CALL.equals(intent.getAction())
                    && checkSelfPermission(Manifest.permission.CALL_PHONE) !=
                    PackageManager.PERMISSION_GRANTED) {

                setWaitingForResult(PendingRequestArgs
                        .forIntent(REQUEST_PERMISSION_CALL_PHONE, intent, info));
                requestPermissions(new String[]{Manifest.permission.CALL_PHONE},
                        REQUEST_PERMISSION_CALL_PHONE);
            } else {
                // No idea why this was thrown.
                throw e;
            }
        }
    }

    @TargetApi(Build.VERSION_CODES.M)
    public Bundle getActivityLaunchOptions(View v) {
        if (Utilities.ATLEAST_MARSHMALLOW) {
            int left = 0, top = 0;
            int width = v.getMeasuredWidth(), height = v.getMeasuredHeight();
            if (v instanceof BubbleTextView) {
                // Launch from center of icon, not entire view
                Drawable icon = ((BubbleTextView) v).getIcon();
                if (icon != null) {
                    Rect bounds = icon.getBounds();
                    left = (width - bounds.width()) / 2;
                    top = v.getPaddingTop();
                    width = bounds.width();
                    height = bounds.height();
                }
            }
            return ActivityOptions.makeClipRevealAnimation(v, left, top, width, height).toBundle();
        } else if (Utilities.ATLEAST_LOLLIPOP_MR1) {
            // On L devices, we use the device default slide-up transition.
            // On L MR1 devices, we use a custom version of the slide-up transition which
            // doesn't have the delay present in the device default.
            return ActivityOptions.makeCustomAnimation(
                    this, R.anim.task_open_enter, R.anim.no_anim).toBundle();
        }
        return null;
    }

    public Rect getViewBounds(View v) {
        int[] pos = new int[2];
        v.getLocationOnScreen(pos);
        return new Rect(pos[0], pos[1], pos[0] + v.getWidth(), pos[1] + v.getHeight());
    }

    public boolean startActivitySafely(View v, Intent intent, ItemInfo item) {
        mAppLaunchSuccess = false;
        if (mIsSafeModeEnabled && !Utilities.isSystemApp(this, intent)) {
            Toast.makeText(this, R.string.safemode_shortcut_error, Toast.LENGTH_SHORT).show();
            return mAppLaunchSuccess;
        }
        // Only launch using the new animation if the shortcut has not opted out (this is a
        // private contract between launcher and may be ignored in the future).
        boolean useLaunchAnimation = (v != null) &&
                !intent.hasExtra(INTENT_EXTRA_IGNORE_LAUNCH_ANIMATION);
        Bundle optsBundle = useLaunchAnimation ? getActivityLaunchOptions(v) : null;

        UserHandle user = item == null ? null : item.user;

        // Prepare intent
        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        if (v != null) {
            intent.setSourceBounds(getViewBounds(v));
        }
        try {
            if (Utilities.ATLEAST_MARSHMALLOW
                    && (item instanceof ShortcutInfo)
                    && (item.itemType == Favorites.ITEM_TYPE_SHORTCUT
                     || item.itemType == Favorites.ITEM_TYPE_DEEP_SHORTCUT)
                    && !((ShortcutInfo) item).isPromise()) {
                // Shortcuts need some special checks due to legacy reasons.
                startShortcutIntentSafely(intent, optsBundle, item);
            } else if (user == null || user.equals(Process.myUserHandle())) {
                // Could be launching some bookkeeping activity
                startActivity(intent, optsBundle);
            } else {
                LauncherAppsCompat.getInstance(this).startActivityForProfile(
                        intent.getComponent(), user, intent.getSourceBounds(), optsBundle);
            }

            if (v instanceof BubbleTextView) {
                // This is set to the view that launched the activity that navigated the user away
                // from launcher. Since there is no callback for when the activity has finished
                // launching, enable the press state and keep this reference to reset the press
                // state when we return to launcher.
                BubbleTextView btv = (BubbleTextView) v;
                btv.setStayPressed(true);
                setOnResumeCallback(btv);
            }
            mAppLaunchSuccess = true;
            getUserEventDispatcher().logAppLaunch(v, intent); // TODO for discovered apps b/35802115
        } catch (ActivityNotFoundException|SecurityException e) {
            Toast.makeText(this, R.string.activity_not_found, Toast.LENGTH_SHORT).show();
            Log.e(TAG, "Unable to launch. tag=" + item + " intent=" + intent, e);
        }
        return mAppLaunchSuccess;
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
        mLastDispatchTouchEventX = ev.getX();
        return super.dispatchTouchEvent(ev);
    }

    @Override
    public boolean onLongClick(View v) {
        if (!isDraggingEnabled()) return false;
        if (isWorkspaceLocked()) return false;
        if (!isInState(NORMAL) && !isInState(OVERVIEW)) return false;

        boolean ignoreLongPressToOverview =
                mDeviceProfile.shouldIgnoreLongPressToOverview(mLastDispatchTouchEventX);

        if (v instanceof Workspace) {
            if (!isInState(OVERVIEW)) {
                if (!mWorkspace.isTouchActive() && !ignoreLongPressToOverview) {
                    getUserEventDispatcher().logActionOnContainer(Action.Touch.LONGPRESS,
                            Action.Direction.NONE, ContainerType.WORKSPACE,
                            mWorkspace.getCurrentPage());
                    getStateManager().goToState(OVERVIEW);
                    mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                            HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
                    return true;
                } else {
                    return false;
                }
            } else {
                return false;
            }
        }

        CellLayout.CellInfo longClickCellInfo = null;
        View itemUnderLongClick = null;
        if (v.getTag() instanceof ItemInfo) {
            ItemInfo info = (ItemInfo) v.getTag();
            longClickCellInfo = new CellLayout.CellInfo(v, info);
            itemUnderLongClick = longClickCellInfo.cell;
            mPendingRequestArgs = null;
        }

        // The hotseat touch handling does not go through Workspace, and we always allow long press
        // on hotseat items.
        if (!mDragController.isDragging()) {
            if (itemUnderLongClick == null) {
                // User long pressed on empty space
                if (mWorkspace.isPageRearrangeEnabled()) {
                    mWorkspace.startReordering(v);
                    getUserEventDispatcher().logActionOnContainer(Action.Touch.LONGPRESS,
                            Action.Direction.NONE, ContainerType.OVERVIEW);
                } else {
                    if (ignoreLongPressToOverview) {
                        return false;
                    }
                    getUserEventDispatcher().logActionOnContainer(Action.Touch.LONGPRESS,
                            Action.Direction.NONE, ContainerType.WORKSPACE,
                            mWorkspace.getCurrentPage());
                    getStateManager().goToState(OVERVIEW);
                }
                mWorkspace.performHapticFeedback(HapticFeedbackConstants.LONG_PRESS,
                        HapticFeedbackConstants.FLAG_IGNORE_VIEW_SETTING);
            } else {
                final boolean isAllAppsButton =
                        !FeatureFlags.NO_ALL_APPS_ICON && isHotseatLayout(v) &&
                                mDeviceProfile.inv.isAllAppsButtonRank(mHotseat.getOrderInHotseat(
                                        longClickCellInfo.cellX, longClickCellInfo.cellY));
                if (!(itemUnderLongClick instanceof Folder || isAllAppsButton)) {
                    // User long pressed on an item
                    mWorkspace.startDrag(longClickCellInfo, new DragOptions());
                }
            }
        }
        return true;
    }

    boolean isHotseatLayout(View layout) {
        // TODO: Remove this method
        return mHotseat != null && layout != null &&
                (layout instanceof CellLayout) && (layout == mHotseat.getLayout());
    }

    /**
     * Returns the CellLayout of the specified container at the specified screen.
     */
    public CellLayout getCellLayout(long container, long screenId) {
        if (container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
            if (mHotseat != null) {
                return mHotseat.getLayout();
            } else {
                return null;
            }
        } else {
            return mWorkspace.getScreenWithId(screenId);
        }
    }

    @Override
    public void onTrimMemory(int level) {
        super.onTrimMemory(level);
        if (level >= ComponentCallbacks2.TRIM_MEMORY_UI_HIDDEN) {
            // The widget preview db can result in holding onto over
            // 3MB of memory for caching which isn't necessary.
            SQLiteDatabase.releaseMemory();

            // This clears all widget bitmaps from the widget tray
            // TODO(hyunyoungs)
        }
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.onTrimMemory(level);
        }
    }

    @Override
    public boolean dispatchPopulateAccessibilityEvent(AccessibilityEvent event) {
        final boolean result = super.dispatchPopulateAccessibilityEvent(event);
        final List<CharSequence> text = event.getText();
        text.clear();
        // Populate event with a fake title based on the current state.
        // TODO: When can workspace be null?
        text.add(mWorkspace == null
                ? getString(R.string.all_apps_home_button_label)
                : mStateManager.getState().getDescription(this));
        return result;
    }

    /**
     * If the activity is currently paused, signal that we need to run the passed Runnable
     * in onResume.
     *
     * This needs to be called from incoming places where resources might have been loaded
     * while the activity is paused. That is because the Configuration (e.g., rotation)  might be
     * wrong when we're not running, and if the activity comes back to what the configuration was
     * when we were paused, activity is not restarted.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     *
     * @return {@code true} if we are currently paused. The caller might be able to skip some work
     */
    @Thunk boolean waitUntilResume(Runnable run) {
        if (mPaused) {
            if (LOGD) Log.d(TAG, "Deferring update until onResume");
            if (run instanceof RunnableWithId) {
                // Remove any runnables which have the same id
                while (mBindOnResumeCallbacks.remove(run)) { }
            }
            mBindOnResumeCallbacks.add(run);
            return true;
        } else {
            return false;
        }
    }

    public void setOnResumeCallback(OnResumeCallback callback) {
        if (mOnResumeCallback != null) {
            mOnResumeCallback.onLauncherResume();
        }
        mOnResumeCallback = callback;
    }

    /**
     * If the activity is currently paused, signal that we need to re-run the loader
     * in onResume.
     *
     * This needs to be called from incoming places where resources might have been loaded
     * while we are paused.  That is becaues the Configuration might be wrong
     * when we're not running, and if it comes back to what it was when we
     * were paused, we are not restarted.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     *
     * @return true if we are currently paused.  The caller might be able to
     * skip some work in that case since we will come back again.
     */
    @Override
    public boolean setLoadOnResume() {
        if (mPaused) {
            if (LOGD) Log.d(TAG, "setLoadOnResume");
            mOnResumeNeedsLoad = true;
            return true;
        } else {
            return false;
        }
    }

    /**
     * Implementation of the method from LauncherModel.Callbacks.
     */
    @Override
    public int getCurrentWorkspaceScreen() {
        if (mWorkspace != null) {
            return mWorkspace.getCurrentPage();
        } else {
            return 0;
        }
    }

    /**
     * Clear any pending bind callbacks. This is called when is loader is planning to
     * perform a full rebind from scratch.
     */
    @Override
    public void clearPendingBinds() {
        mBindOnResumeCallbacks.clear();
        if (mPendingExecutor != null) {
            mPendingExecutor.markCompleted();
            mPendingExecutor = null;
        }
    }

    /**
     * Refreshes the shortcuts shown on the workspace.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void startBinding() {
        TraceHelper.beginSection("startBinding");
        // Floating panels (except the full widget sheet) are associated with individual icons. If
        // we are starting a fresh bind, close all such panels as all the icons are about
        // to go away.
        AbstractFloatingView.closeOpenViews(this, true,
                AbstractFloatingView.TYPE_ALL & ~AbstractFloatingView.TYPE_WIDGETS_FULL_SHEET);

        setWorkspaceLoading(true);

        // Clear the workspace because it's going to be rebound
        mWorkspace.clearDropTargets();
        mWorkspace.removeAllWorkspaceScreens();

        if (mHotseat != null) {
            mHotseat.resetLayout();
        }
        TraceHelper.endSection("startBinding");
    }

    @Override
    public void bindScreens(ArrayList<Long> orderedScreenIds) {
        // Make sure the first screen is always at the start.
        if (FeatureFlags.QSB_ON_FIRST_SCREEN &&
                orderedScreenIds.indexOf(Workspace.FIRST_SCREEN_ID) != 0) {
            orderedScreenIds.remove(Workspace.FIRST_SCREEN_ID);
            orderedScreenIds.add(0, Workspace.FIRST_SCREEN_ID);
            LauncherModel.updateWorkspaceScreenOrder(this, orderedScreenIds);
        } else if (!FeatureFlags.QSB_ON_FIRST_SCREEN && orderedScreenIds.isEmpty()) {
            // If there are no screens, we need to have an empty screen
            mWorkspace.addExtraEmptyScreen();
        }
        bindAddScreens(orderedScreenIds);

        // After we have added all the screens, if the wallpaper was locked to the default state,
        // then notify to indicate that it can be released and a proper wallpaper offset can be
        // computed before the next layout
        mWorkspace.unlockWallpaperFromDefaultPageOnNextLayout();
    }

    private void bindAddScreens(ArrayList<Long> orderedScreenIds) {
        int count = orderedScreenIds.size();
        for (int i = 0; i < count; i++) {
            long screenId = orderedScreenIds.get(i);
            if (!FeatureFlags.QSB_ON_FIRST_SCREEN || screenId != Workspace.FIRST_SCREEN_ID) {
                // No need to bind the first screen, as its always bound.
                mWorkspace.insertNewWorkspaceScreenBeforeEmptyScreen(screenId);
            }
        }
    }

    @Override
    public void bindAppsAdded(final ArrayList<Long> newScreens,
                              final ArrayList<ItemInfo> addNotAnimated,
                              final ArrayList<ItemInfo> addAnimated) {
        Runnable r = new Runnable() {
            public void run() {
                bindAppsAdded(newScreens, addNotAnimated, addAnimated);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        // Add the new screens
        if (newScreens != null) {
            bindAddScreens(newScreens);
        }

        // We add the items without animation on non-visible pages, and with
        // animations on the new page (which we will try and snap to).
        if (addNotAnimated != null && !addNotAnimated.isEmpty()) {
            bindItems(addNotAnimated, false);
        }
        if (addAnimated != null && !addAnimated.isEmpty()) {
            bindItems(addAnimated, true);
        }

        // Remove the extra empty screen
        mWorkspace.removeExtraEmptyScreen(false, false);
    }

    /**
     * Bind the items start-end from the list.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    @Override
    public void bindItems(final List<ItemInfo> items, final boolean forceAnimateIcons) {
        Runnable r = new Runnable() {
            public void run() {
                bindItems(items, forceAnimateIcons);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        // Get the list of added items and intersect them with the set of items here
        final AnimatorSet anim = LauncherAnimUtils.createAnimatorSet();
        final Collection<Animator> bounceAnims = new ArrayList<>();
        final boolean animateIcons = forceAnimateIcons && canRunNewAppsAnimation();
        Workspace workspace = mWorkspace;
        long newItemsScreenId = -1;
        int end = items.size();
        for (int i = 0; i < end; i++) {
            final ItemInfo item = items.get(i);

            // Short circuit if we are loading dock items for a configuration which has no dock
            if (item.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT &&
                    mHotseat == null) {
                continue;
            }

            final View view;
            switch (item.itemType) {
                case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                case LauncherSettings.Favorites.ITEM_TYPE_DEEP_SHORTCUT: {
                    ShortcutInfo info = (ShortcutInfo) item;
                    view = createShortcut(info);
                    break;
                }
                case LauncherSettings.Favorites.ITEM_TYPE_FOLDER: {
                    view = FolderIcon.fromXml(R.layout.folder_icon, this,
                            (ViewGroup) workspace.getChildAt(workspace.getCurrentPage()),
                            (FolderInfo) item);
                    break;
                }
                case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
                case LauncherSettings.Favorites.ITEM_TYPE_CUSTOM_APPWIDGET: {
                    view = inflateAppWidget((LauncherAppWidgetInfo) item);
                    if (view == null) {
                        continue;
                    }
                    break;
                }
                default:
                    throw new RuntimeException("Invalid Item Type");
            }

             /*
             * Remove colliding items.
             */
            if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
                CellLayout cl = mWorkspace.getScreenWithId(item.screenId);
                if (cl != null && cl.isOccupied(item.cellX, item.cellY)) {
                    View v = cl.getChildAt(item.cellX, item.cellY);
                    Object tag = v.getTag();
                    String desc = "Collision while binding workspace item: " + item
                            + ". Collides with " + tag;
                    if (FeatureFlags.IS_DOGFOOD_BUILD) {
                        throw (new RuntimeException(desc));
                    } else {
                        Log.d(TAG, desc);
                        getModelWriter().deleteItemFromDatabase(item);
                        continue;
                    }
                }
            }
            workspace.addInScreenFromBind(view, item);
            if (animateIcons) {
                // Animate all the applications up now
                view.setAlpha(0f);
                view.setScaleX(0f);
                view.setScaleY(0f);
                bounceAnims.add(createNewAppBounceAnimation(view, i));
                newItemsScreenId = item.screenId;
            }
        }

        if (animateIcons) {
            // Animate to the correct page
            if (newItemsScreenId > -1) {
                long currentScreenId = mWorkspace.getScreenIdForPageIndex(mWorkspace.getNextPage());
                final int newScreenIndex = mWorkspace.getPageIndexForScreenId(newItemsScreenId);
                final Runnable startBounceAnimRunnable = new Runnable() {
                    public void run() {
                        anim.playTogether(bounceAnims);
                        anim.start();
                    }
                };
                if (newItemsScreenId != currentScreenId) {
                    // We post the animation slightly delayed to prevent slowdowns
                    // when we are loading right after we return to launcher.
                    mWorkspace.postDelayed(new Runnable() {
                        public void run() {
                            if (mWorkspace != null) {
                                mWorkspace.snapToPage(newScreenIndex);
                                mWorkspace.postDelayed(startBounceAnimRunnable,
                                        NEW_APPS_ANIMATION_DELAY);
                            }
                        }
                    }, NEW_APPS_PAGE_MOVE_DELAY);
                } else {
                    mWorkspace.postDelayed(startBounceAnimRunnable, NEW_APPS_ANIMATION_DELAY);
                }
            }
        }
        workspace.requestLayout();
    }

    /**
     * Add the views for a widget to the workspace.
     */
    public void bindAppWidget(LauncherAppWidgetInfo item) {
        View view = inflateAppWidget(item);
        if (view != null) {
            mWorkspace.addInScreen(view, item);
            mWorkspace.requestLayout();
        }
    }

    private View inflateAppWidget(LauncherAppWidgetInfo item) {
        if (mIsSafeModeEnabled) {
            PendingAppWidgetHostView view =
                    new PendingAppWidgetHostView(this, item, mIconCache, true);
            prepareAppWidget(view, item);
            return view;
        }

        TraceHelper.beginSection("BIND_WIDGET");

        final LauncherAppWidgetProviderInfo appWidgetInfo;

        if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_PROVIDER_NOT_READY)) {
            // If the provider is not ready, bind as a pending widget.
            appWidgetInfo = null;
        } else if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_NOT_VALID)) {
            // The widget id is not valid. Try to find the widget based on the provider info.
            appWidgetInfo = mAppWidgetManager.findProvider(item.providerName, item.user);
        } else {
            appWidgetInfo = mAppWidgetManager.getLauncherAppWidgetInfo(item.appWidgetId);
        }

        // If the provider is ready, but the width is not yet restored, try to restore it.
        if (!item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_PROVIDER_NOT_READY) &&
                (item.restoreStatus != LauncherAppWidgetInfo.RESTORE_COMPLETED)) {
            if (appWidgetInfo == null) {
                Log.d(TAG, "Removing restored widget: id=" + item.appWidgetId
                        + " belongs to component " + item.providerName
                        + ", as the provider is null");
                getModelWriter().deleteItemFromDatabase(item);
                return null;
            }

            // If we do not have a valid id, try to bind an id.
            if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_NOT_VALID)) {
                if (!item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_ID_ALLOCATED)) {
                    // Id has not been allocated yet. Allocate a new id.
                    item.appWidgetId = mAppWidgetHost.allocateAppWidgetId();
                    item.restoreStatus |= LauncherAppWidgetInfo.FLAG_ID_ALLOCATED;

                    // Also try to bind the widget. If the bind fails, the user will be shown
                    // a click to setup UI, which will ask for the bind permission.
                    PendingAddWidgetInfo pendingInfo = new PendingAddWidgetInfo(appWidgetInfo);
                    pendingInfo.spanX = item.spanX;
                    pendingInfo.spanY = item.spanY;
                    pendingInfo.minSpanX = item.minSpanX;
                    pendingInfo.minSpanY = item.minSpanY;
                    Bundle options = WidgetHostViewLoader.getDefaultOptionsForWidget(this, pendingInfo);

                    boolean isDirectConfig =
                            item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_DIRECT_CONFIG);
                    if (isDirectConfig && item.bindOptions != null) {
                        Bundle newOptions = item.bindOptions.getExtras();
                        if (options != null) {
                            newOptions.putAll(options);
                        }
                        options = newOptions;
                    }
                    boolean success = mAppWidgetManager.bindAppWidgetIdIfAllowed(
                            item.appWidgetId, appWidgetInfo, options);

                    // We tried to bind once. If we were not able to bind, we would need to
                    // go through the permission dialog, which means we cannot skip the config
                    // activity.
                    item.bindOptions = null;
                    item.restoreStatus &= ~LauncherAppWidgetInfo.FLAG_DIRECT_CONFIG;

                    // Bind succeeded
                    if (success) {
                        // If the widget has a configure activity, it is still needs to set it up,
                        // otherwise the widget is ready to go.
                        item.restoreStatus = (appWidgetInfo.configure == null) || isDirectConfig
                                ? LauncherAppWidgetInfo.RESTORE_COMPLETED
                                : LauncherAppWidgetInfo.FLAG_UI_NOT_READY;
                    }

                    getModelWriter().updateItemInDatabase(item);
                }
            } else if (item.hasRestoreFlag(LauncherAppWidgetInfo.FLAG_UI_NOT_READY)
                    && (appWidgetInfo.configure == null)) {
                // The widget was marked as UI not ready, but there is no configure activity to
                // update the UI.
                item.restoreStatus = LauncherAppWidgetInfo.RESTORE_COMPLETED;
                getModelWriter().updateItemInDatabase(item);
            }
        }

        final AppWidgetHostView view;
        if (item.restoreStatus == LauncherAppWidgetInfo.RESTORE_COMPLETED) {
            // Verify that we own the widget
            if (appWidgetInfo == null) {
                FileLog.e(TAG, "Removing invalid widget: id=" + item.appWidgetId);
                deleteWidgetInfo(item);
                return null;
            }

            item.minSpanX = appWidgetInfo.minSpanX;
            item.minSpanY = appWidgetInfo.minSpanY;
            view = mAppWidgetHost.createView(this, item.appWidgetId, appWidgetInfo);
        } else {
            view = new PendingAppWidgetHostView(this, item, mIconCache, false);
        }
        prepareAppWidget(view, item);

        TraceHelper.endSection("BIND_WIDGET", "id=" + item.appWidgetId);
        return view;
    }

    /**
     * Restores a pending widget.
     *
     * @param appWidgetId The app widget id
     */
    private LauncherAppWidgetInfo completeRestoreAppWidget(int appWidgetId, int finalRestoreFlag) {
        LauncherAppWidgetHostView view = mWorkspace.getWidgetForAppWidgetId(appWidgetId);
        if ((view == null) || !(view instanceof PendingAppWidgetHostView)) {
            Log.e(TAG, "Widget update called, when the widget no longer exists.");
            return null;
        }

        LauncherAppWidgetInfo info = (LauncherAppWidgetInfo) view.getTag();
        info.restoreStatus = finalRestoreFlag;
        if (info.restoreStatus == LauncherAppWidgetInfo.RESTORE_COMPLETED) {
            info.pendingItemInfo = null;
        }

        if (((PendingAppWidgetHostView) view).isReinflateIfNeeded()) {
            view.reinflate();
        }

        getModelWriter().updateItemInDatabase(info);
        return info;
    }

    public void onPageBoundSynchronously(int page) {
        mSynchronouslyBoundPages.add(page);
    }

    @Override
    public void executeOnNextDraw(ViewOnDrawExecutor executor) {
        if (mPendingExecutor != null) {
            mPendingExecutor.markCompleted();
        }
        mPendingExecutor = executor;
        executor.attachTo(this);
    }

    public void clearPendingExecutor(ViewOnDrawExecutor executor) {
        if (mPendingExecutor == executor) {
            mPendingExecutor = null;
        }
    }

    @Override
    public void finishFirstPageBind(final ViewOnDrawExecutor executor) {
        Runnable r = new Runnable() {
            public void run() {
                finishFirstPageBind(executor);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        Runnable onComplete = new Runnable() {
            @Override
            public void run() {
                if (executor != null) {
                    executor.onLoadAnimationCompleted();
                }
            }
        };
        if (mDragLayer.getAlpha() < 1) {
            mDragLayer.animate().alpha(1).withEndAction(onComplete).start();
        } else {
            onComplete.run();
        }
    }

    /**
     * Callback saying that there aren't any more items to bind.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void finishBindingItems() {
        Runnable r = new Runnable() {
            public void run() {
                finishBindingItems();
            }
        };
        if (waitUntilResume(r)) {
            return;
        }
        TraceHelper.beginSection("finishBindingItems");
        mWorkspace.restoreInstanceStateForRemainingPages();

        setWorkspaceLoading(false);

        if (mPendingActivityResult != null) {
            handleActivityResult(mPendingActivityResult.requestCode,
                    mPendingActivityResult.resultCode, mPendingActivityResult.data);
            mPendingActivityResult = null;
        }

        InstallShortcutReceiver.disableAndFlushInstallQueue(
                InstallShortcutReceiver.FLAG_LOADER_RUNNING, this);

        NotificationListener.setNotificationsChangedListener(mPopupDataProvider);
        TraceHelper.endSection("finishBindingItems");
    }

    private boolean canRunNewAppsAnimation() {
        long diff = System.currentTimeMillis() - mDragController.getLastGestureUpTime();
        return diff > (NEW_APPS_ANIMATION_INACTIVE_TIMEOUT_SECONDS * 1000);
    }

    private ValueAnimator createNewAppBounceAnimation(View v, int i) {
        ValueAnimator bounceAnim = LauncherAnimUtils.ofViewAlphaAndScale(v, 1, 1, 1);
        bounceAnim.setDuration(InstallShortcutReceiver.NEW_SHORTCUT_BOUNCE_DURATION);
        bounceAnim.setStartDelay(i * InstallShortcutReceiver.NEW_SHORTCUT_STAGGER_DELAY);
        bounceAnim.setInterpolator(new OvershootInterpolator(BOUNCE_ANIMATION_TENSION));
        return bounceAnim;
    }

    public boolean useVerticalBarLayout() {
        return mDeviceProfile.isVerticalBarLayout();
    }

    /**
     * Add the icons for all apps.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindAllApplications(final ArrayList<AppInfo> apps) {
        Runnable r = new RunnableWithId(RUNNABLE_ID_BIND_APPS) {
            public void run() {
                bindAllApplications(apps);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        if (mAppsView != null) {
            Executor pendingExecutor = getPendingExecutor();
            if (pendingExecutor != null && !isInState(ALL_APPS)) {
                // Wait until the fade in animation has finished before setting all apps list.
                pendingExecutor.execute(r);
                return;
            }

            mAppsView.setApps(apps);
        }
        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.bindAllApplications(apps);
        }
    }

    /**
     * Returns an Executor that will run after the launcher is first drawn (including after the
     * initial fade in animation). Returns null if the first draw has already occurred.
     */
    public @Nullable Executor getPendingExecutor() {
        return mPendingExecutor != null && mPendingExecutor.canQueue() ? mPendingExecutor : null;
    }

    /**
     * Copies LauncherModel's map of activities to shortcut ids to Launcher's. This is necessary
     * because LauncherModel's map is updated in the background, while Launcher runs on the UI.
     */
    @Override
    public void bindDeepShortcutMap(MultiHashMap<ComponentKey, String> deepShortcutMapCopy) {
        mPopupDataProvider.setDeepShortcutMap(deepShortcutMapCopy);
    }

    /**
     * A package was updated.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    public void bindAppsAddedOrUpdated(final ArrayList<AppInfo> apps) {
        Runnable r = new Runnable() {
            public void run() {
                bindAppsAddedOrUpdated(apps);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        if (mAppsView != null) {
            mAppsView.addOrUpdateApps(apps);
        }
    }

    @Override
    public void bindPromiseAppProgressUpdated(final PromiseAppInfo app) {
        Runnable r = new Runnable() {
            public void run() {
                bindPromiseAppProgressUpdated(app);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        if (mAppsView != null) {
            mAppsView.updatePromiseAppProgress(app);
        }
    }

    @Override
    public void bindWidgetsRestored(final ArrayList<LauncherAppWidgetInfo> widgets) {
        Runnable r = new Runnable() {
            public void run() {
                bindWidgetsRestored(widgets);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }
        mWorkspace.widgetsRestored(widgets);
    }

    /**
     * Some shortcuts were updated in the background.
     * Implementation of the method from LauncherModel.Callbacks.
     *
     * @param updated list of shortcuts which have changed.
     */
    @Override
    public void bindShortcutsChanged(final ArrayList<ShortcutInfo> updated, final UserHandle user) {
        Runnable r = new Runnable() {
            public void run() {
                bindShortcutsChanged(updated, user);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        if (!updated.isEmpty()) {
            mWorkspace.updateShortcuts(updated);
        }
    }

    /**
     * Update the state of a package, typically related to install state.
     *
     * Implementation of the method from LauncherModel.Callbacks.
     */
    @Override
    public void bindRestoreItemsChange(final HashSet<ItemInfo> updates) {
        Runnable r = new Runnable() {
            public void run() {
                bindRestoreItemsChange(updates);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        mWorkspace.updateRestoreItems(updates);
    }

    /**
     * A package was uninstalled/updated.  We take both the super set of packageNames
     * in addition to specific applications to remove, the reason being that
     * this can be called when a package is updated as well.  In that scenario,
     * we only remove specific components from the workspace and hotseat, where as
     * package-removal should clear all items by package name.
     */
    @Override
    public void bindWorkspaceComponentsRemoved(final ItemInfoMatcher matcher) {
        Runnable r = new Runnable() {
            public void run() {
                bindWorkspaceComponentsRemoved(matcher);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }
        mWorkspace.removeItemsByMatcher(matcher);
        mDragController.onAppsRemoved(matcher);
    }

    @Override
    public void bindAppInfosRemoved(final ArrayList<AppInfo> appInfos) {
        Runnable r = new Runnable() {
            public void run() {
                bindAppInfosRemoved(appInfos);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        // Update AllApps
        if (mAppsView != null) {
            mAppsView.removeApps(appInfos);
        }
    }

    @Override
    public void bindAllWidgets(final ArrayList<WidgetListRowEntry> allWidgets) {
        mPopupDataProvider.setAllWidgets(allWidgets);
        Runnable r = new RunnableWithId(RUNNABLE_ID_BIND_WIDGETS) {
            @Override
            public void run() {
                bindAllWidgets(allWidgets);
            }
        };
        if (waitUntilResume(r)) {
            return;
        }

        AbstractFloatingView topView = AbstractFloatingView.getTopOpenView(this);
        if (topView != null) {
            topView.onWidgetsBound();
        }
    }

    /**
     * @param packageUser if null, refreshes all widgets and shortcuts, otherwise only
     *                    refreshes the widgets and shortcuts associated with the given package/user
     */
    public void refreshAndBindWidgetsForPackageUser(@Nullable PackageUserKey packageUser) {
        mModel.refreshAndBindWidgetsAndShortcuts(packageUser);
    }

    public boolean isRotationEnabled () {
        return mRotationEnabled;
    }

    private boolean shouldShowDiscoveryBounce() {
        return isInState(NORMAL)
                && !mSharedPrefs.getBoolean(AllAppsState.APPS_VIEW_SHOWN, false)
                && !UserManagerCompat.getInstance(this).isDemoUser();
    }

    /**
     * $ adb shell dumpsys activity com.android.launcher3.Launcher [--all]
     */
    @Override
    public void dump(String prefix, FileDescriptor fd, PrintWriter writer, String[] args) {
        super.dump(prefix, fd, writer, args);

        if (args.length > 0 && TextUtils.equals(args[0], "--all")) {
            writer.println(prefix + "Workspace Items");
            for (int i = 0; i < mWorkspace.getPageCount(); i++) {
                writer.println(prefix + "  Homescreen " + i);

                ViewGroup layout = ((CellLayout) mWorkspace.getPageAt(i)).getShortcutsAndWidgets();
                for (int j = 0; j < layout.getChildCount(); j++) {
                    Object tag = layout.getChildAt(j).getTag();
                    if (tag != null) {
                        writer.println(prefix + "    " + tag.toString());
                    }
                }
            }

            writer.println(prefix + "  Hotseat");
            ViewGroup layout = mHotseat.getLayout().getShortcutsAndWidgets();
            for (int j = 0; j < layout.getChildCount(); j++) {
                Object tag = layout.getChildAt(j).getTag();
                if (tag != null) {
                    writer.println(prefix + "    " + tag.toString());
                }
            }

            try {
                FileLog.flushAll(writer);
            } catch (Exception e) {
                // Ignore
            }
        }

        writer.println(prefix + "Misc:");
        writer.print(prefix + "\tmWorkspaceLoading=" + mWorkspaceLoading);
        writer.print(" mPendingRequestArgs=" + mPendingRequestArgs);
        writer.println(" mPendingActivityResult=" + mPendingActivityResult);

        mModel.dumpState(prefix, fd, writer, args);

        if (mLauncherCallbacks != null) {
            mLauncherCallbacks.dump(prefix, fd, writer, args);
        }
    }

    @Override
    @TargetApi(Build.VERSION_CODES.N)
    public void onProvideKeyboardShortcuts(
            List<KeyboardShortcutGroup> data, Menu menu, int deviceId) {

        ArrayList<KeyboardShortcutInfo> shortcutInfos = new ArrayList<>();
        if (isInState(NORMAL)) {
            shortcutInfos.add(new KeyboardShortcutInfo(getString(R.string.all_apps_button_label),
                    KeyEvent.KEYCODE_A, KeyEvent.META_CTRL_ON));
        }
        View currentFocus = getCurrentFocus();
        if (new CustomActionsPopup(this, currentFocus).canShow()) {
            shortcutInfos.add(new KeyboardShortcutInfo(getString(R.string.custom_actions),
                    KeyEvent.KEYCODE_O, KeyEvent.META_CTRL_ON));
        }
        if (currentFocus.getTag() instanceof ItemInfo
                && DeepShortcutManager.supportsShortcuts((ItemInfo) currentFocus.getTag())) {
            shortcutInfos.add(new KeyboardShortcutInfo(getString(R.string.action_deep_shortcut),
                    KeyEvent.KEYCODE_S, KeyEvent.META_CTRL_ON));
        }
        if (!shortcutInfos.isEmpty()) {
            data.add(new KeyboardShortcutGroup(getString(R.string.home_screen), shortcutInfos));
        }

        super.onProvideKeyboardShortcuts(data, menu, deviceId);
    }

    @Override
    public boolean onKeyShortcut(int keyCode, KeyEvent event) {
        if (event.hasModifiers(KeyEvent.META_CTRL_ON)) {
            switch (keyCode) {
                case KeyEvent.KEYCODE_A:
                    if (isInState(NORMAL)) {
                        getStateManager().goToState(ALL_APPS);
                        return true;
                    }
                    break;
                case KeyEvent.KEYCODE_S: {
                    View focusedView = getCurrentFocus();
                    if (focusedView instanceof BubbleTextView
                            && focusedView.getTag() instanceof ItemInfo
                            && mAccessibilityDelegate.performAction(focusedView,
                                    (ItemInfo) focusedView.getTag(),
                                    LauncherAccessibilityDelegate.DEEP_SHORTCUTS)) {
                        BaseActionPopup.getOpen(this).requestFocus();
                        return true;
                    }
                    break;
                }
                case KeyEvent.KEYCODE_O:
                    if (new CustomActionsPopup(this, getCurrentFocus()).show()) {
                        return true;
                    }
                    break;
            }
        }
        return super.onKeyShortcut(keyCode, event);
    }

    public static Launcher getLauncher(Context context) {
        if (context instanceof Launcher) {
            return (Launcher) context;
        }
        return ((Launcher) ((ContextWrapper) context).getBaseContext());
    }

    private class RotationPrefChangeHandler implements OnSharedPreferenceChangeListener {

        @Override
        public void onSharedPreferenceChanged(
                SharedPreferences sharedPreferences, String key) {
            if (Utilities.ALLOW_ROTATION_PREFERENCE_KEY.equals(key)) {
                // Recreate the activity so that it initializes the rotation preference again.
                recreate();
            }
        }
    }

    /**
     * Callback for listening for onResume
     */
    public interface OnResumeCallback {

        void onLauncherResume();
    }
}