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

3 files changed, 103 insertions, 8 deletions

diff --git a/src/com/android/dialer/DialtactsActivity.java b/src/com/android/dialer/DialtactsActivity.java
index 3603696bf..1b4002cd1 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.os.ServiceManager;
 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.DecelerateInterpolator;
 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 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
         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 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
     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 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
             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 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
             }
         } else if (fragment instanceof ListsFragment) {
             mListsFragment = (ListsFragment) fragment;
+            mListsFragment.addOnPageChangeListener(this);
         }
     }
 
@@ -590,6 +605,7 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
             mFragmentsFrame.animate().alpha(0.0f);
         }
         getActionBar().hide();
+        alignFloatingActionButtonMiddle();
     }
 
     /**
@@ -614,6 +630,7 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
             mFragmentsFrame.animate().alpha(1.0f);
         }
         getActionBar().show();
+        alignFloatingActionButtonByTab(mCurrentTabPosition);
     }
 
     private void hideInputMethod(View view) {
@@ -953,4 +970,43 @@ public class DialtactsActivity extends TransactionSafeActivity implements View.O
     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);
+    }
 }
diff --git a/src/com/android/dialer/list/ListsFragment.java b/src/com/android/dialer/list/ListsFragment.java
index 676b3b075..a61d8a55f 100644
--- a/src/com/android/dialer/list/ListsFragment.java
+++ b/src/com/android/dialer/list/ListsFragment.java
@@ -14,6 +14,7 @@ import android.os.Bundle;
 import android.provider.CallLog;
 import android.support.v13.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
+import android.support.v4.view.ViewPager.OnPageChangeListener;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
@@ -22,6 +23,7 @@ import android.widget.ListView;
 
 import com.android.contacts.common.GeoUtil;
 import com.android.dialer.DialtactsActivity;
+
 import android.view.View.OnClickListener;
 
 import com.android.dialer.R;
@@ -32,6 +34,8 @@ import com.android.dialer.calllog.CallLogQueryHandler;
 import com.android.dialer.calllog.ContactInfoHelper;
 import com.android.dialerbind.ObjectFactory;
 
+import java.util.ArrayList;
+
 /**
  * Fragment that is used as the main screen of the Dialer.
  *
@@ -41,11 +45,11 @@ import com.android.dialerbind.ObjectFactory;
  * screen.
  */
 public class ListsFragment extends Fragment implements CallLogQueryHandler.Listener,
-        CallLogAdapter.CallFetcher {
+        CallLogAdapter.CallFetcher, ViewPager.OnPageChangeListener {
 
-    private static final int TAB_INDEX_SPEED_DIAL = 0;
-    private static final int TAB_INDEX_RECENTS = 1;
-    private static final int TAB_INDEX_ALL_CONTACTS = 2;
+    public static final int TAB_INDEX_SPEED_DIAL = 0;
+    public static final int TAB_INDEX_RECENTS = 1;
+    public static final int TAB_INDEX_ALL_CONTACTS = 2;
 
     private static final int TAB_INDEX_COUNT = 3;
 
@@ -64,10 +68,13 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
     }
 
     private ViewPager mViewPager;
+    private ViewPagerTabs mViewPagerTabs;
     private ViewPagerAdapter mViewPagerAdapter;
     private SpeedDialFragment mSpeedDialFragment;
     private CallLogFragment mRecentsFragment;
     private AllContactsFragment mAllContactsFragment;
+    private ArrayList<OnPageChangeListener> mOnPageChangeListeners =
+            new ArrayList<OnPageChangeListener>();
 
     private String[] mTabTitles;
 
@@ -204,14 +211,16 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
         mViewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());
         mViewPager.setAdapter(mViewPagerAdapter);
         mViewPager.setOffscreenPageLimit(2);
+        mViewPager.setOnPageChangeListener(this);
 
         mTabTitles = new String[TAB_INDEX_COUNT];
         mTabTitles[TAB_INDEX_SPEED_DIAL] = getResources().getString(R.string.tab_speed_dial);
         mTabTitles[TAB_INDEX_RECENTS] = getResources().getString(R.string.tab_recents);
         mTabTitles[TAB_INDEX_ALL_CONTACTS] = getResources().getString(R.string.tab_all_contacts);
 
-        ViewPagerTabs tabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
-        tabs.setViewPager(mViewPager);
+        mViewPagerTabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
+        mViewPagerTabs.setViewPager(mViewPager);
+        addOnPageChangeListener(mViewPagerTabs);
 
         final ListView shortcutCardsListView =
                 (ListView) parentView.findViewById(R.id.shortcut_card_list);
@@ -255,4 +264,35 @@ public class ListsFragment extends Fragment implements CallLogQueryHandler.Liste
                 .apply();
         fetchCalls();
     }
+
+    public void addOnPageChangeListener(OnPageChangeListener onPageChangeListener) {
+        if (!mOnPageChangeListeners.contains(onPageChangeListener)) {
+            mOnPageChangeListeners.add(onPageChangeListener);
+        }
+    }
+
+    @Override
+    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageScrolled(position, positionOffset,
+                    positionOffsetPixels);
+        }
+    }
+
+    @Override
+    public void onPageSelected(int position) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageSelected(position);
+        }
+    }
+
+    @Override
+    public void onPageScrollStateChanged(int state) {
+        final int count = mOnPageChangeListeners.size();
+        for (int i = 0; i < count; i++) {
+            mOnPageChangeListeners.get(i).onPageScrollStateChanged(state);
+        }
+    }
 }
diff --git a/src/com/android/dialer/list/ViewPagerTabs.java b/src/com/android/dialer/list/ViewPagerTabs.java
index a538d09d0..b54580249 100644
--- a/src/com/android/dialer/list/ViewPagerTabs.java
+++ b/src/com/android/dialer/list/ViewPagerTabs.java
@@ -108,7 +108,6 @@ public class ViewPagerTabs extends HorizontalScrollView implements ViewPager.OnP
 
     public void setViewPager(ViewPager viewPager) {
         mPager = viewPager;
-        mPager.setOnPageChangeListener(this);
         addTabs(mPager.getAdapter());
     }