Add Media Management Apps activity in Special App Access

Add a settings page to control the permission MANAGE_MEDIA in Special
App Access. Apps can launch it by ACTION_REQUEST_MANAGE_MEDIA.

Test: m -j RunSettingsRoboTests ROBOTEST_FILTER=MediaManagementAppsDetailsTest
Test: m -j RunSettingsRoboTests
Test: manual
Bug: 181112025
Change-Id: Id7587cf179b8c5adbfd6477ca9c2d4a20a9852bb
diff --git a/src/com/android/settings/Settings.java b/src/com/android/settings/Settings.java
index cf43827..95e68de 100644
--- a/src/com/android/settings/Settings.java
+++ b/src/com/android/settings/Settings.java
@@ -217,6 +217,8 @@
     public static class OverlaySettingsActivity extends SettingsActivity { /* empty */ }
     public static class ManageExternalStorageActivity extends SettingsActivity { /* empty */ }
     public static class AppManageExternalStorageActivity extends SettingsActivity { /* empty */ }
+    public static class MediaManagementAppsActivity extends SettingsActivity { /* empty */ }
+    public static class AppMediaManagementAppsActivity extends SettingsActivity { /* empty */ }
     public static class WriteSettingsActivity extends SettingsActivity { /* empty */ }
     public static class ChangeWifiStateActivity extends SettingsActivity { /* empty */ }
     public static class AppDrawOverlaySettingsActivity extends SettingsActivity { /* empty */ }
diff --git a/src/com/android/settings/applications/AppStateMediaManagementAppsBridge.java b/src/com/android/settings/applications/AppStateMediaManagementAppsBridge.java
new file mode 100644
index 0000000..ff2b4d8
--- /dev/null
+++ b/src/com/android/settings/applications/AppStateMediaManagementAppsBridge.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright (C) 2021 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.settings.applications;
+
+import android.Manifest;
+import android.app.AppOpsManager;
+import android.content.Context;
+
+import com.android.settingslib.applications.ApplicationsState;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+import com.android.settingslib.applications.ApplicationsState.AppFilter;
+
+import java.util.List;
+
+/**
+ * Retrieves information from {@link AppOpsManager} and {@link android.content.pm.PackageManager}
+ * regarding {@link AppOpsManager#OP_MANAGE_MEDIA} and
+ * {@link Manifest.permission#MANAGE_MEDIA}.
+ */
+public class AppStateMediaManagementAppsBridge extends AppStateAppOpsBridge {
+
+    private final AppOpsManager mAppOpsManager;
+
+    public AppStateMediaManagementAppsBridge(Context context, ApplicationsState appState,
+            Callback callback) {
+        super(context, appState, callback,
+                AppOpsManager.strOpToOp(AppOpsManager.OPSTR_MANAGE_MEDIA),
+                new String[]{Manifest.permission.MANAGE_MEDIA});
+
+        mAppOpsManager = context.getSystemService(AppOpsManager.class);
+    }
+
+    @Override
+    protected void updateExtraInfo(AppEntry app, String pkg, int uid) {
+        app.extraInfo = createPermissionState(pkg, uid);
+    }
+
+    @Override
+    protected void loadAllExtraInfo() {
+        super.loadAllExtraInfo();
+        final List<AppEntry> allApps = mAppSession.getAllApps();
+        final int appCount = allApps.size();
+        for (int i = 0; i < appCount; i++) {
+            final AppEntry appEntry = allApps.get(i);
+            if (appEntry.extraInfo instanceof PermissionState) {
+                updateExtraInfo(appEntry, appEntry.info.packageName, appEntry.info.uid);
+            }
+        }
+    }
+
+    /**
+     * Returns information regarding {@link Manifest.permission#MANAGE_MEDIA} for the given
+     * package and uid.
+     */
+    public PermissionState createPermissionState(String packageName, int uid) {
+        final PermissionState permissionState = getPermissionInfo(packageName, uid);
+        permissionState.appOpMode = mAppOpsManager.unsafeCheckOpNoThrow(
+                AppOpsManager.OPSTR_MANAGE_MEDIA, uid, packageName);
+        return permissionState;
+    }
+
+    /**
+     * Used by {@link com.android.settings.applications.manageapplications.AppFilterRegistry} to
+     * determine which apps get to appear on the Special App Access list.
+     */
+    public static final AppFilter FILTER_MEDIA_MANAGEMENT_APPS = new AppFilter() {
+        @Override
+        public void init() {
+        }
+
+        @Override
+        public boolean filterApp(AppEntry info) {
+            return info.extraInfo != null;
+        }
+    };
+}
diff --git a/src/com/android/settings/applications/appinfo/MediaManagementAppsDetails.java b/src/com/android/settings/applications/appinfo/MediaManagementAppsDetails.java
new file mode 100644
index 0000000..f60fb4f
--- /dev/null
+++ b/src/com/android/settings/applications/appinfo/MediaManagementAppsDetails.java
@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2021 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.settings.applications.appinfo;
+
+import android.app.AppOpsManager;
+import android.app.settings.SettingsEnums;
+import android.content.Context;
+import android.os.Bundle;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.preference.Preference;
+import androidx.preference.Preference.OnPreferenceChangeListener;
+import androidx.preference.SwitchPreference;
+
+import com.android.settings.R;
+import com.android.settings.applications.AppInfoWithHeader;
+import com.android.settings.applications.AppStateAppOpsBridge.PermissionState;
+import com.android.settings.applications.AppStateMediaManagementAppsBridge;
+import com.android.settingslib.applications.ApplicationsState.AppEntry;
+
+/**
+ * Class for displaying app info related to {@link AppOpsManager#OP_MANAGE_MEDIA}.
+ */
+public class MediaManagementAppsDetails extends AppInfoWithHeader implements
+        OnPreferenceChangeListener {
+
+    private static final String KEY_SWITCH_PREF = "media_management_apps_toggle";
+
+    private AppStateMediaManagementAppsBridge mAppBridge;
+    private AppOpsManager mAppOpsManager;
+    private SwitchPreference mSwitchPref;
+    private PermissionState mPermissionState;
+
+    @Override
+    public void onCreate(Bundle savedInstanceState) {
+        super.onCreate(savedInstanceState);
+
+        final Context context = getActivity();
+        mAppBridge = new AppStateMediaManagementAppsBridge(context, mState, null /* callback */);
+        mAppOpsManager = context.getSystemService(AppOpsManager.class);
+
+        // initialize preferences
+        addPreferencesFromResource(R.xml.media_management_apps);
+        mSwitchPref = findPreference(KEY_SWITCH_PREF);
+
+        // install event listeners
+        mSwitchPref.setOnPreferenceChangeListener(this);
+    }
+
+    @Override
+    public boolean onPreferenceChange(Preference preference, Object newValue) {
+        final boolean value = (Boolean) newValue;
+        if (preference == mSwitchPref) {
+            if (mPermissionState != null && value != mPermissionState.isPermissible()) {
+                setCanManageMedia(value);
+                logPermissionChange(value, mPackageName);
+                refreshUi();
+            }
+            return true;
+        }
+        return false;
+    }
+
+    private void setCanManageMedia(boolean newState) {
+        mAppOpsManager.setUidMode(AppOpsManager.OP_MANAGE_MEDIA, mPackageInfo.applicationInfo.uid,
+                newState ? AppOpsManager.MODE_ALLOWED : AppOpsManager.MODE_ERRORED);
+    }
+
+    private void logPermissionChange(boolean newState, String packageName) {
+        mMetricsFeatureProvider.action(
+                mMetricsFeatureProvider.getAttribution(getActivity()),
+                SettingsEnums.ACTION_MEDIA_MANAGEMENT_APPS_TOGGLE,
+                getMetricsCategory(),
+                packageName,
+                newState ? 1 : 0);
+    }
+
+    @Override
+    protected boolean refreshUi() {
+        if (mPackageInfo == null || mPackageInfo.applicationInfo == null) {
+            return false;
+        }
+
+        mPermissionState = mAppBridge.createPermissionState(mPackageName,
+                mPackageInfo.applicationInfo.uid);
+        mSwitchPref.setEnabled(mPermissionState.permissionDeclared);
+        mSwitchPref.setChecked(mPermissionState.isPermissible());
+        return true;
+    }
+
+    @Override
+    protected AlertDialog createDialog(int id, int errorCode) {
+        return null;
+    }
+
+    @Override
+    public int getMetricsCategory() {
+        return SettingsEnums.MEDIA_MANAGEMENT_APPS;
+    }
+
+    /**
+     * Returns the string that states whether the app has access to
+     * {@link android.Manifest.permission#MANAGE_MEDIA}.
+     */
+    public static int getSummary(Context context, AppEntry entry) {
+        final PermissionState state;
+        if (entry.extraInfo instanceof PermissionState) {
+            state = (PermissionState) entry.extraInfo;
+        } else {
+            state = new AppStateMediaManagementAppsBridge(context, null /* appState */,
+                    null /* callback */).createPermissionState(entry.info.packageName,
+                    entry.info.uid);
+        }
+
+        return state.isPermissible() ? R.string.app_permission_summary_allowed
+                : R.string.app_permission_summary_not_allowed;
+    }
+}
diff --git a/src/com/android/settings/applications/manageapplications/AppFilterRegistry.java b/src/com/android/settings/applications/manageapplications/AppFilterRegistry.java
index f4de226..d1d4f62 100644
--- a/src/com/android/settings/applications/manageapplications/AppFilterRegistry.java
+++ b/src/com/android/settings/applications/manageapplications/AppFilterRegistry.java
@@ -22,6 +22,7 @@
 import com.android.settings.applications.AppStateAlarmsAndRemindersBridge;
 import com.android.settings.applications.AppStateInstallAppsBridge;
 import com.android.settings.applications.AppStateManageExternalStorageBridge;
+import com.android.settings.applications.AppStateMediaManagementAppsBridge;
 import com.android.settings.applications.AppStateNotificationBridge;
 import com.android.settings.applications.AppStateOverlayBridge;
 import com.android.settings.applications.AppStatePowerBridge;
@@ -52,6 +53,7 @@
             FILTER_APPS_INSTALL_SOURCES,
             FILTER_APPS_BLOCKED,
             FILTER_ALARMS_AND_REMINDERS,
+            FILTER_APPS_MEDIA_MANAGEMENT,
     })
     @interface FilterType {
     }
@@ -76,14 +78,15 @@
     public static final int FILTER_APPS_BLOCKED = 16;
     public static final int FILTER_MANAGE_EXTERNAL_STORAGE = 17;
     public static final int FILTER_ALARMS_AND_REMINDERS = 18;
-    // Next id: 18. If you add an entry here, length of mFilters should be updated
+    public static final int FILTER_APPS_MEDIA_MANAGEMENT = 19;
+    // Next id: 20. If you add an entry here, length of mFilters should be updated
 
     private static AppFilterRegistry sRegistry;
 
     private final AppFilterItem[] mFilters;
 
     private AppFilterRegistry() {
-        mFilters = new AppFilterItem[19];
+        mFilters = new AppFilterItem[20];
 
         // High power allowlist, on
         mFilters[FILTER_APPS_POWER_ALLOWLIST] = new AppFilterItem(
@@ -194,6 +197,12 @@
                 AppStateAlarmsAndRemindersBridge.FILTER_CLOCK_APPS,
                 FILTER_ALARMS_AND_REMINDERS,
                 R.string.alarms_and_reminders_title);
+
+        // Apps that can manage media files
+        mFilters[FILTER_APPS_MEDIA_MANAGEMENT] = new AppFilterItem(
+                AppStateMediaManagementAppsBridge.FILTER_MEDIA_MANAGEMENT_APPS,
+                FILTER_APPS_MEDIA_MANAGEMENT,
+                R.string.media_management_apps_title);
     }
 
     public static AppFilterRegistry getInstance() {
@@ -224,6 +233,8 @@
                 return FILTER_MANAGE_EXTERNAL_STORAGE;
             case ManageApplications.LIST_TYPE_ALARMS_AND_REMINDERS:
                 return FILTER_ALARMS_AND_REMINDERS;
+            case ManageApplications.LIST_TYPE_MEDIA_MANAGEMENT_APPS:
+                return FILTER_APPS_MEDIA_MANAGEMENT;
             default:
                 return FILTER_APPS_ALL;
         }
diff --git a/src/com/android/settings/applications/manageapplications/ManageApplications.java b/src/com/android/settings/applications/manageapplications/ManageApplications.java
index 2dadbbc..e98555b 100644
--- a/src/com/android/settings/applications/manageapplications/ManageApplications.java
+++ b/src/com/android/settings/applications/manageapplications/ManageApplications.java
@@ -96,6 +96,7 @@
 import com.android.settings.applications.AppStateBaseBridge;
 import com.android.settings.applications.AppStateInstallAppsBridge;
 import com.android.settings.applications.AppStateManageExternalStorageBridge;
+import com.android.settings.applications.AppStateMediaManagementAppsBridge;
 import com.android.settings.applications.AppStateNotificationBridge;
 import com.android.settings.applications.AppStateNotificationBridge.NotificationsSentState;
 import com.android.settings.applications.AppStateOverlayBridge;
@@ -110,6 +111,7 @@
 import com.android.settings.applications.appinfo.DrawOverlayDetails;
 import com.android.settings.applications.appinfo.ExternalSourcesDetails;
 import com.android.settings.applications.appinfo.ManageExternalStorageDetails;
+import com.android.settings.applications.appinfo.MediaManagementAppsDetails;
 import com.android.settings.applications.appinfo.WriteSettingsDetails;
 import com.android.settings.core.FeatureFlags;
 import com.android.settings.core.InstrumentedFragment;
@@ -233,6 +235,7 @@
     public static final int LIST_TYPE_WIFI_ACCESS = 13;
     public static final int LIST_MANAGE_EXTERNAL_STORAGE = 14;
     public static final int LIST_TYPE_ALARMS_AND_REMINDERS = 15;
+    public static final int LIST_TYPE_MEDIA_MANAGEMENT_APPS = 16;
 
     // List types that should show instant apps.
     public static final Set<Integer> LIST_TYPES_WITH_INSTANT = new ArraySet<>(Arrays.asList(
@@ -324,6 +327,9 @@
         } else if (className.equals(Settings.ManageExternalStorageActivity.class.getName())) {
             mListType = LIST_MANAGE_EXTERNAL_STORAGE;
             screenTitle = R.string.manage_external_storage_title;
+        }  else if (className.equals(Settings.MediaManagementAppsActivity.class.getName())) {
+            mListType = LIST_TYPE_MEDIA_MANAGEMENT_APPS;
+            screenTitle = R.string.media_management_apps_title;
         } else if (className.equals(Settings.AlarmsAndRemindersActivity.class.getName())) {
             mListType = LIST_TYPE_ALARMS_AND_REMINDERS;
             screenTitle = R.string.alarms_and_reminders_title;
@@ -553,6 +559,8 @@
                 return SettingsEnums.MANAGE_EXTERNAL_STORAGE;
             case LIST_TYPE_ALARMS_AND_REMINDERS:
                 return SettingsEnums.ALARMS_AND_REMINDERS;
+            case LIST_TYPE_MEDIA_MANAGEMENT_APPS:
+                return SettingsEnums.MEDIA_MANAGEMENT_APPS;
             default:
                 return SettingsEnums.PAGE_UNKNOWN;
         }
@@ -678,6 +686,10 @@
                 startAppInfoFragment(AlarmsAndRemindersDetails.class,
                         R.string.alarms_and_reminders_label);
                 break;
+            case LIST_TYPE_MEDIA_MANAGEMENT_APPS:
+                startAppInfoFragment(MediaManagementAppsDetails.class,
+                        R.string.media_management_apps_title);
+                break;
             // TODO: Figure out if there is a way where we can spin up the profile's settings
             // process ahead of time, to avoid a long load of data when user clicks on a managed
             // app. Maybe when they load the list of apps that contains managed profile apps.
@@ -758,6 +770,8 @@
                 return R.string.help_uri_manage_external_storage;
             case LIST_TYPE_ALARMS_AND_REMINDERS:
                 return R.string.help_uri_alarms_and_reminders;
+            case LIST_TYPE_MEDIA_MANAGEMENT_APPS:
+                return R.string.help_uri_media_management_apps;
             default:
             case LIST_TYPE_MAIN:
                 return R.string.help_uri_apps;
@@ -1082,6 +1096,8 @@
                 mExtraInfoBridge = new AppStateManageExternalStorageBridge(mContext, mState, this);
             } else if (mManageApplications.mListType == LIST_TYPE_ALARMS_AND_REMINDERS) {
                 mExtraInfoBridge = new AppStateAlarmsAndRemindersBridge(mContext, mState, this);
+            } else if (mManageApplications.mListType == LIST_TYPE_MEDIA_MANAGEMENT_APPS) {
+                mExtraInfoBridge = new AppStateMediaManagementAppsBridge(mContext, mState, this);
             } else {
                 mExtraInfoBridge = null;
             }
@@ -1546,6 +1562,9 @@
                 case LIST_TYPE_ALARMS_AND_REMINDERS:
                     holder.setSummary(AlarmsAndRemindersDetails.getSummary(mContext, entry));
                     break;
+                case LIST_TYPE_MEDIA_MANAGEMENT_APPS:
+                    holder.setSummary(MediaManagementAppsDetails.getSummary(mContext, entry));
+                    break;
                 default:
                     holder.updateSizeText(entry, mManageApplications.mInvalidSizeStr, mWhichSize);
                     break;
diff --git a/src/com/android/settings/core/gateway/SettingsGateway.java b/src/com/android/settings/core/gateway/SettingsGateway.java
index 5e51284..c08c149 100644
--- a/src/com/android/settings/core/gateway/SettingsGateway.java
+++ b/src/com/android/settings/core/gateway/SettingsGateway.java
@@ -45,6 +45,7 @@
 import com.android.settings.applications.appinfo.DrawOverlayDetails;
 import com.android.settings.applications.appinfo.ExternalSourcesDetails;
 import com.android.settings.applications.appinfo.ManageExternalStorageDetails;
+import com.android.settings.applications.appinfo.MediaManagementAppsDetails;
 import com.android.settings.applications.appinfo.WriteSettingsDetails;
 import com.android.settings.applications.appops.BackgroundCheckSummary;
 import com.android.settings.applications.assist.ManageAssist;
@@ -318,6 +319,7 @@
             MediaControlsSettings.class.getName(),
             NetworkProviderSettings.class.getName(),
             AlarmsAndRemindersDetails.class.getName(),
+            MediaManagementAppsDetails.class.getName()
     };
 
     public static final String[] SETTINGS_FOR_RESTRICTED = {