commit cc4660d463daa11b969fd9b8bdd308ae3416c67a
author Yorke Lee <yorkelee@google.com> Thu Apr 24 11:22:57 2014 -0700
committer Yorke Lee <yorkelee@google.com> Fri Apr 25 10:45:41 2014 -0700
tree 4d9af81120ea0ab469b47b9914d5682c4ac75c2e
parent e33cf96b4be14f64935b91e6a21ec1c8ab676acf

Animate floating action button

DialtactsActivity now implements ViewPager.OnPageChangeListener,
so that it can animate the floating action button in response
to page changed events in ListsFragments. Because ViewPagerTabs
also needs to listen to page changed events and ViewPager only
supports one OnPageChangeListener, ListsFragments is now in charge
of listening to page changed events from ViewPager and firing off
the same events to multiple OnpageChangedListeners

Bug: 14281810

Change-Id: Ic9b7ca8669d3a9cc0a997a84afe6788d6fd51bb9

src/com/android/dialer/DialtactsActivity.java

diff --git a/src/com/android/dialer/DialtactsActivity.java b/src/com/android/dialer/DialtactsActivity.java
index 3603696..1b4002c 100644
--- a/src/com/android/dialer/DialtactsActivity.java
+++ b/src/com/android/dialer/DialtactsActivity.java
@@ -17,6 +17,7 @@
 package com.android.dialer;
 
 import android.animation.Animator;
+import android.animation.LayoutTransition;
 import android.animation.Animator.AnimatorListener;
 import android.animation.AnimatorListenerAdapter;
 import android.app.Activity;
@@ -38,9 +39,11 @@
 import android.provider.ContactsContract.Contacts;
 import android.provider.ContactsContract.Intents;
 import android.speech.RecognizerIntent;
+import android.support.v4.view.ViewPager;
 import android.telephony.TelephonyManager;
 import android.text.TextUtils;
 import android.util.Log;
+import android.view.Gravity;
 import android.view.Menu;
 import android.view.MenuInflater;
 import android.view.MenuItem;
@@ -54,8 +57,10 @@
 import android.view.animation.Interpolator;
 import android.view.inputmethod.InputMethodManager;
 import android.widget.AbsListView.OnScrollListener;
+import android.widget.FrameLayout;
 import android.widget.LinearLayout;
 import android.widget.PopupMenu;
+import android.widget.RelativeLayout;
 import android.widget.SearchView;
 import android.widget.SearchView.OnQueryTextListener;
 import android.widget.Toast;
@@ -99,7 +104,8 @@
         ListsFragment.HostInterface,
         SpeedDialFragment.HostInterface,
         OnDragDropListener, View.OnLongClickListener,
-        OnPhoneNumberPickerActionListener {
+        OnPhoneNumberPickerActionListener,
+        ViewPager.OnPageChangeListener {
     private static final String TAG = "DialtactsActivity";
 
     public static final boolean DEBUG = Log.isLoggable(TAG, Log.DEBUG);
@@ -166,6 +172,11 @@
     private boolean mClearSearchOnPause;
 
     /**
+     * The position of the currently selected tab in the attached {@link ListsFragment}.
+     */
+    private int mCurrentTabPosition = 0;
+
+    /**
      * True if the dialpad is only temporarily showing due to being in call
      */
     private boolean mInCallDialpadUp;
@@ -327,6 +338,9 @@
             mFirstLaunch = savedInstanceState.getBoolean(KEY_FIRST_LAUNCH);
         }
 
+        RelativeLayout parent = (RelativeLayout) findViewById(R.id.dialtacts_mainlayout);
+        parent.getLayoutTransition().enableTransitionType(LayoutTransition.CHANGING);
+
         mFragmentsFrame = findViewById(R.id.dialtacts_frame);
 
         mFloatingActionButton = findViewById(R.id.floating_action_button);
@@ -398,6 +412,7 @@
             }
         } else if (fragment instanceof ListsFragment) {
             mListsFragment = (ListsFragment) fragment;
+            mListsFragment.addOnPageChangeListener(this);
         }
     }
 
@@ -590,6 +605,7 @@
             mFragmentsFrame.animate().alpha(0.0f);
         }
         getActionBar().hide();
+        alignFloatingActionButtonMiddle();
     }
 
     /**
@@ -614,6 +630,7 @@
             mFragmentsFrame.animate().alpha(1.0f);
         }
         getActionBar().show();
+        alignFloatingActionButtonByTab(mCurrentTabPosition);
     }
 
     private void hideInputMethod(View view) {
@@ -953,4 +970,43 @@
     public int getActionBarHeight() {
         return mActionBarHeight;
     }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        mCurrentTabPosition = position;
+        alignFloatingActionButtonByTab(mCurrentTabPosition);
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+    }
+
+    private void alignFloatingActionButtonByTab(int position) {
+        if (position == ListsFragment.TAB_INDEX_SPEED_DIAL) {
+            alignFloatingActionButtonMiddle();
+        } else {
+            alignFloatingActionButtonRight();
+        }
+    }
+
+    private void alignFloatingActionButtonRight() {
+        final RelativeLayout.LayoutParams params =
+                (RelativeLayout.LayoutParams) mFloatingActionButton.getLayoutParams();
+        params.removeRule(RelativeLayout.CENTER_HORIZONTAL);
+        params.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
+        mFloatingActionButton.setLayoutParams(params);
+    }
+
+    private void alignFloatingActionButtonMiddle() {
+        final RelativeLayout.LayoutParams params =
+                (RelativeLayout.LayoutParams) mFloatingActionButton.getLayoutParams();
+        params.removeRule(RelativeLayout.ALIGN_PARENT_RIGHT);
+        params.addRule(RelativeLayout.CENTER_HORIZONTAL);
+        mFloatingActionButton.setLayoutParams(params);
+    }
 }