java/com/android/dialer/app/list/ListsFragment.java - platform/packages/apps/Dialer - Gitiles

 /*
  * Copyright (C) 2013 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.dialer.app.list;

 import android.app.Activity;
 import android.app.Fragment;
 import android.app.FragmentManager;
 import android.content.SharedPreferences;
 import android.database.ContentObserver;
 import android.database.Cursor;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Trace;
 import android.preference.PreferenceManager;
 import android.provider.VoicemailContract;
 import android.support.annotation.Nullable;
 import android.support.v13.app.FragmentPagerAdapter;
 import android.support.v4.view.ViewPager;
 import android.support.v4.view.ViewPager.OnPageChangeListener;
 import android.support.v7.app.ActionBar;
 import android.support.v7.app.AppCompatActivity;
 import android.view.LayoutInflater;
 import android.view.View;
 import android.view.ViewGroup;
 import com.android.contacts.common.list.ViewPagerTabs;
 import com.android.dialer.app.R;
 import com.android.dialer.app.calllog.CallLogFragment;
 import com.android.dialer.app.calllog.CallLogNotificationsHelper;
 import com.android.dialer.app.calllog.VisualVoicemailCallLogFragment;
 import com.android.dialer.app.voicemail.error.VoicemailStatusCorruptionHandler;
 import com.android.dialer.app.voicemail.error.VoicemailStatusCorruptionHandler.Source;
 import com.android.dialer.app.widget.ActionBarController;
 import com.android.dialer.common.LogUtil;
 import com.android.dialer.database.CallLogQueryHandler;
 import com.android.dialer.logging.Logger;
 import com.android.dialer.logging.nano.DialerImpression;
 import com.android.dialer.logging.nano.ScreenEvent;
 import com.android.dialer.util.ViewUtil;
 import com.android.dialer.voicemailstatus.VisualVoicemailEnabledChecker;
 import com.android.dialer.voicemailstatus.VoicemailStatusHelper;
 import com.android.dialer.voicemailstatus.VoicemailStatusHelperImpl;
 import java.util.ArrayList;
 import java.util.List;

 /**
  * Fragment that is used as the main screen of the Dialer.
  *
  * <p>Contains a ViewPager that contains various contact lists like the Speed Dial list and the All
  * Contacts list. This will also eventually contain the logic that allows sliding the ViewPager
  * containing the lists up above the search bar and pin it against the top of the screen.
  */
 public class ListsFragment extends Fragment
     implements ViewPager.OnPageChangeListener, CallLogQueryHandler.Listener {

   /** Every fragment in the list show implement this interface. */
   public interface ListsPage {

     /**
      * Called when the page is resumed, including selecting the page or activity resume. Note: This
      * is called before the page fragment is attached to a activity.
      *
      * @param activity the activity hosting the ListFragment
      */
     void onPageResume(@Nullable Activity activity);

     /**
      * Called when the page is paused, including selecting another page or activity pause. Note:
      * This is called after the page fragment is detached from a activity.
      *
      * @param activity the activity hosting the ListFragment
      */
     void onPagePause(@Nullable Activity activity);
   }

   public static final int TAB_INDEX_SPEED_DIAL = 0;
   public static final int TAB_INDEX_HISTORY = 1;
   public static final int TAB_INDEX_ALL_CONTACTS = 2;
   public static final int TAB_INDEX_VOICEMAIL = 3;
   public static final int TAB_COUNT_DEFAULT = 3;
   public static final int TAB_COUNT_WITH_VOICEMAIL = 4;
   private static final String TAG = "ListsFragment";
   private ActionBar mActionBar;
   private ViewPager mViewPager;
   private ViewPagerTabs mViewPagerTabs;
   private ViewPagerAdapter mViewPagerAdapter;
   private RemoveView mRemoveView;
   private View mRemoveViewContent;
   private SpeedDialFragment mSpeedDialFragment;
   private CallLogFragment mHistoryFragment;
   private AllContactsFragment mAllContactsFragment;
   private CallLogFragment mVoicemailFragment;
   private ListsPage mCurrentPage;
   private SharedPreferences mPrefs;
   private boolean mHasActiveVoicemailProvider;
   private boolean mHasFetchedVoicemailStatus;
   private boolean mShowVoicemailTabAfterVoicemailStatusIsFetched;
   private VoicemailStatusHelper mVoicemailStatusHelper;
   private ArrayList<OnPageChangeListener> mOnPageChangeListeners =
       new ArrayList<OnPageChangeListener>();
   private String[] mTabTitles;
   private int[] mTabIcons;
   /** The position of the currently selected tab. */
   private int mTabIndex = TAB_INDEX_SPEED_DIAL;

   private CallLogQueryHandler mCallLogQueryHandler;

   private final ContentObserver mVoicemailStatusObserver =
       new ContentObserver(new Handler()) {
         @Override
         public void onChange(boolean selfChange) {
           super.onChange(selfChange);
           mCallLogQueryHandler.fetchVoicemailStatus();
         }
       };

   @Override
   public void onCreate(Bundle savedInstanceState) {
     LogUtil.d("ListsFragment.onCreate", null);
     Trace.beginSection(TAG + " onCreate");
     super.onCreate(savedInstanceState);

     mVoicemailStatusHelper = new VoicemailStatusHelperImpl();
     mHasFetchedVoicemailStatus = false;

     mPrefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
     mHasActiveVoicemailProvider =
         mPrefs.getBoolean(
             VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);

     Trace.endSection();
   }

   @Override
   public void onResume() {
     LogUtil.d("ListsFragment.onResume", null);
     Trace.beginSection(TAG + " onResume");
     super.onResume();

     mActionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
     if (getUserVisibleHint()) {
       sendScreenViewForCurrentPosition();
     }

     // Fetch voicemail status to determine if we should show the voicemail tab.
     mCallLogQueryHandler =
         new CallLogQueryHandler(getActivity(), getActivity().getContentResolver(), this);
     mCallLogQueryHandler.fetchVoicemailStatus();
     mCallLogQueryHandler.fetchMissedCallsUnreadCount();
     Trace.endSection();
     mCurrentPage = getListsPage(mViewPager.getCurrentItem());
     if (mCurrentPage != null) {
       mCurrentPage.onPageResume(getActivity());
     }
   }

   @Override
   public void onPause() {
     LogUtil.d("ListsFragment.onPause", null);
     if (mCurrentPage != null) {
       mCurrentPage.onPagePause(getActivity());
     }
     super.onPause();
   }

   @Override
   public void onDestroyView() {
     super.onDestroyView();
     mViewPager.removeOnPageChangeListener(this);
   }

   @Override
   public View onCreateView(
       LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
     LogUtil.d("ListsFragment.onCreateView", null);
     Trace.beginSection(TAG + " onCreateView");
     Trace.beginSection(TAG + " inflate view");
     final View parentView = inflater.inflate(R.layout.lists_fragment, container, false);
     Trace.endSection();
     Trace.beginSection(TAG + " setup views");
     mViewPager = (ViewPager) parentView.findViewById(R.id.lists_pager);
     mViewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());
     mViewPager.setAdapter(mViewPagerAdapter);
     mViewPager.setOffscreenPageLimit(TAB_COUNT_WITH_VOICEMAIL - 1);
     mViewPager.addOnPageChangeListener(this);
     showTab(TAB_INDEX_SPEED_DIAL);

     mTabTitles = new String[TAB_COUNT_WITH_VOICEMAIL];
     mTabTitles[TAB_INDEX_SPEED_DIAL] = getResources().getString(R.string.tab_speed_dial);
     mTabTitles[TAB_INDEX_HISTORY] = getResources().getString(R.string.tab_history);
     mTabTitles[TAB_INDEX_ALL_CONTACTS] = getResources().getString(R.string.tab_all_contacts);
     mTabTitles[TAB_INDEX_VOICEMAIL] = getResources().getString(R.string.tab_voicemail);

     mTabIcons = new int[TAB_COUNT_WITH_VOICEMAIL];
     mTabIcons[TAB_INDEX_SPEED_DIAL] = R.drawable.ic_grade_24dp;
     mTabIcons[TAB_INDEX_HISTORY] = R.drawable.ic_schedule_24dp;
     mTabIcons[TAB_INDEX_ALL_CONTACTS] = R.drawable.ic_people_24dp;
     mTabIcons[TAB_INDEX_VOICEMAIL] = R.drawable.ic_voicemail_24dp;

     mViewPagerTabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
     mViewPagerTabs.configureTabIcons(mTabIcons);
     mViewPagerTabs.setViewPager(mViewPager);
     addOnPageChangeListener(mViewPagerTabs);

     mRemoveView = (RemoveView) parentView.findViewById(R.id.remove_view);
     mRemoveViewContent = parentView.findViewById(R.id.remove_view_content);

     getActivity()
         .getContentResolver()
         .registerContentObserver(
             VoicemailContract.Status.CONTENT_URI, true, mVoicemailStatusObserver);

     Trace.endSection();
     Trace.endSection();
     return parentView;
   }

   @Override
   public void onDestroy() {
     getActivity().getContentResolver().unregisterContentObserver(mVoicemailStatusObserver);
     super.onDestroy();
   }

   public void addOnPageChangeListener(OnPageChangeListener onPageChangeListener) {
     if (!mOnPageChangeListeners.contains(onPageChangeListener)) {
       mOnPageChangeListeners.add(onPageChangeListener);
     }
   }

   /**
    * Shows the tab with the specified index. If the voicemail tab index is specified, but the
    * voicemail status hasn't been fetched, it will try to show the tab after the voicemail status
    * has been fetched.
    */
   public void showTab(int index) {
     if (index == TAB_INDEX_VOICEMAIL) {
       if (mHasActiveVoicemailProvider) {
         Logger.get(getContext()).logImpression(DialerImpression.Type.VVM_TAB_VISIBLE);
         mViewPager.setCurrentItem(getRtlPosition(TAB_INDEX_VOICEMAIL));
       } else if (!mHasFetchedVoicemailStatus) {
         // Try to show the voicemail tab after the voicemail status returns.
         mShowVoicemailTabAfterVoicemailStatusIsFetched = true;
       }
     } else if (index < getTabCount()) {
       mViewPager.setCurrentItem(getRtlPosition(index));
     }
   }

   @Override
   public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
     mTabIndex = getRtlPosition(position);

     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) {
     LogUtil.i("ListsFragment.onPageSelected", "position: %d", position);
     mTabIndex = getRtlPosition(position);

     // Show the tab which has been selected instead.
     mShowVoicemailTabAfterVoicemailStatusIsFetched = false;

     final int count = mOnPageChangeListeners.size();
     for (int i = 0; i < count; i++) {
       mOnPageChangeListeners.get(i).onPageSelected(position);
     }
     sendScreenViewForCurrentPosition();

     if (mCurrentPage != null) {
       mCurrentPage.onPagePause(getActivity());
     }
     mCurrentPage = getListsPage(position);
     if (mCurrentPage != null) {
       mCurrentPage.onPageResume(getActivity());
     }
   }

   @Override
   public void onPageScrollStateChanged(int state) {
     final int count = mOnPageChangeListeners.size();
     for (int i = 0; i < count; i++) {
       mOnPageChangeListeners.get(i).onPageScrollStateChanged(state);
     }
   }

   @Override
   public void onVoicemailStatusFetched(Cursor statusCursor) {
     mHasFetchedVoicemailStatus = true;

     if (getActivity() == null || getActivity().isFinishing()) {
       return;
     }

     VoicemailStatusCorruptionHandler.maybeFixVoicemailStatus(
         getContext(), statusCursor, Source.Activity);

     // Update mHasActiveVoicemailProvider, which controls the number of tabs displayed.
     boolean hasActiveVoicemailProvider =
         mVoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
     if (hasActiveVoicemailProvider != mHasActiveVoicemailProvider) {
       mHasActiveVoicemailProvider = hasActiveVoicemailProvider;
       mViewPagerAdapter.notifyDataSetChanged();

       if (hasActiveVoicemailProvider) {
         mViewPagerTabs.updateTab(TAB_INDEX_VOICEMAIL);
       } else {
         mViewPagerTabs.removeTab(TAB_INDEX_VOICEMAIL);
         removeVoicemailFragment();
       }

       mPrefs
           .edit()
           .putBoolean(
               VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
               hasActiveVoicemailProvider)
           .commit();
     }

     if (hasActiveVoicemailProvider) {
       mCallLogQueryHandler.fetchVoicemailUnreadCount();
     }

     if (mHasActiveVoicemailProvider && mShowVoicemailTabAfterVoicemailStatusIsFetched) {
       mShowVoicemailTabAfterVoicemailStatusIsFetched = false;
       showTab(TAB_INDEX_VOICEMAIL);
     }
   }

   @Override
   public void onVoicemailUnreadCountFetched(Cursor cursor) {
     if (getActivity() == null || getActivity().isFinishing() || cursor == null) {
       return;
     }

     int count = 0;
     try {
       count = cursor.getCount();
     } finally {
       cursor.close();
     }

     mViewPagerTabs.setUnreadCount(count, TAB_INDEX_VOICEMAIL);
     mViewPagerTabs.updateTab(TAB_INDEX_VOICEMAIL);
   }

   @Override
   public void onMissedCallsUnreadCountFetched(Cursor cursor) {
     if (getActivity() == null || getActivity().isFinishing() || cursor == null) {
       return;
     }

     int count = 0;
     try {
       count = cursor.getCount();
     } finally {
       cursor.close();
     }

     mViewPagerTabs.setUnreadCount(count, TAB_INDEX_HISTORY);
     mViewPagerTabs.updateTab(TAB_INDEX_HISTORY);
   }

   @Override
   public boolean onCallsFetched(Cursor statusCursor) {
     // Return false; did not take ownership of cursor
     return false;
   }

   public int getCurrentTabIndex() {
     return mTabIndex;
   }

   /**
    * External method to update unread count because the unread count changes when the user expands a
    * voicemail in the call log or when the user expands an unread call in the call history tab.
    */
   public void updateTabUnreadCounts() {
     if (mCallLogQueryHandler != null) {
       mCallLogQueryHandler.fetchMissedCallsUnreadCount();
       if (mHasActiveVoicemailProvider) {
         mCallLogQueryHandler.fetchVoicemailUnreadCount();
       }
     }
   }

   /** External method to mark all missed calls as read. */
   public void markMissedCallsAsReadAndRemoveNotifications() {
     if (mCallLogQueryHandler != null) {
       mCallLogQueryHandler.markMissedCallsAsRead();
       CallLogNotificationsHelper.removeMissedCallNotifications(getActivity());
     }
   }

   public void showRemoveView(boolean show) {
     mRemoveViewContent.setVisibility(show ? View.VISIBLE : View.GONE);
     mRemoveView.setAlpha(show ? 0 : 1);
     mRemoveView.animate().alpha(show ? 1 : 0).start();
   }

   public boolean shouldShowActionBar() {
     // TODO: Update this based on scroll state.
     return mActionBar != null;
   }

   public SpeedDialFragment getSpeedDialFragment() {
     return mSpeedDialFragment;
   }

   public RemoveView getRemoveView() {
     return mRemoveView;
   }

   public int getTabCount() {
     return mViewPagerAdapter.getCount();
   }

   private int getRtlPosition(int position) {
     if (ViewUtil.isRtl()) {
       return mViewPagerAdapter.getCount() - 1 - position;
     }
     return position;
   }

   public void sendScreenViewForCurrentPosition() {
     if (!isResumed()) {
       return;
     }

     int screenType;
     switch (getCurrentTabIndex()) {
       case TAB_INDEX_SPEED_DIAL:
         screenType = ScreenEvent.Type.SPEED_DIAL;
         break;
       case TAB_INDEX_HISTORY:
         screenType = ScreenEvent.Type.CALL_LOG;
         break;
       case TAB_INDEX_ALL_CONTACTS:
         screenType = ScreenEvent.Type.ALL_CONTACTS;
         break;
       case TAB_INDEX_VOICEMAIL:
         screenType = ScreenEvent.Type.VOICEMAIL_LOG;
         break;
       default:
         return;
     }
     Logger.get(getActivity()).logScreenView(screenType, getActivity());
   }

   private void removeVoicemailFragment() {
     if (mVoicemailFragment != null) {
       getChildFragmentManager()
           .beginTransaction()
           .remove(mVoicemailFragment)
           .commitAllowingStateLoss();
       mVoicemailFragment = null;
     }
   }

   private ListsPage getListsPage(int position) {
     switch (getRtlPosition(position)) {
       case TAB_INDEX_SPEED_DIAL:
         return mSpeedDialFragment;
       case TAB_INDEX_HISTORY:
         return mHistoryFragment;
       case TAB_INDEX_ALL_CONTACTS:
         return mAllContactsFragment;
       case TAB_INDEX_VOICEMAIL:
         return mVoicemailFragment;
     }
     throw new IllegalStateException("No fragment at position " + position);
   }

   public interface HostInterface {

     ActionBarController getActionBarController();
   }

   public class ViewPagerAdapter extends FragmentPagerAdapter {

     private final List<Fragment> mFragments = new ArrayList<>();

     public ViewPagerAdapter(FragmentManager fm) {
       super(fm);
       for (int i = 0; i < TAB_COUNT_WITH_VOICEMAIL; i++) {
         mFragments.add(null);
       }
     }

     @Override
     public long getItemId(int position) {
       return getRtlPosition(position);
     }

     @Override
     public Fragment getItem(int position) {
       LogUtil.d("ViewPagerAdapter.getItem", "position: %d", position);
       switch (getRtlPosition(position)) {
         case TAB_INDEX_SPEED_DIAL:
           if (mSpeedDialFragment == null) {
             mSpeedDialFragment = new SpeedDialFragment();
           }
           return mSpeedDialFragment;
         case TAB_INDEX_HISTORY:
           if (mHistoryFragment == null) {
             mHistoryFragment = new CallLogFragment();
           }
           return mHistoryFragment;
         case TAB_INDEX_ALL_CONTACTS:
           if (mAllContactsFragment == null) {
             mAllContactsFragment = new AllContactsFragment();
           }
           return mAllContactsFragment;
         case TAB_INDEX_VOICEMAIL:
           if (mVoicemailFragment == null) {
             mVoicemailFragment = new VisualVoicemailCallLogFragment();
             LogUtil.v(
                 "ViewPagerAdapter.getItem",
                 "new VisualVoicemailCallLogFragment: %s",
                 mVoicemailFragment);
           }
           return mVoicemailFragment;
       }
       throw new IllegalStateException("No fragment at position " + position);
     }

     @Override
     public Fragment instantiateItem(ViewGroup container, int position) {
       LogUtil.d("ViewPagerAdapter.instantiateItem", "position: %d", position);
       // On rotation the FragmentManager handles rotation. Therefore getItem() isn't called.
       // Copy the fragments that the FragmentManager finds so that we can store them in
       // instance variables for later.
       final Fragment fragment = (Fragment) super.instantiateItem(container, position);
       if (fragment instanceof SpeedDialFragment) {
         mSpeedDialFragment = (SpeedDialFragment) fragment;
       } else if (fragment instanceof CallLogFragment && position == TAB_INDEX_HISTORY) {
         mHistoryFragment = (CallLogFragment) fragment;
       } else if (fragment instanceof AllContactsFragment) {
         mAllContactsFragment = (AllContactsFragment) fragment;
       } else if (fragment instanceof CallLogFragment && position == TAB_INDEX_VOICEMAIL) {
         mVoicemailFragment = (CallLogFragment) fragment;
         LogUtil.v("ViewPagerAdapter.instantiateItem", mVoicemailFragment.toString());
       }
       mFragments.set(position, fragment);
       return fragment;
     }

     /**
      * When {@link android.support.v4.view.PagerAdapter#notifyDataSetChanged} is called, this method
      * is called on all pages to determine whether they need to be recreated. When the voicemail tab
      * is removed, the view needs to be recreated by returning POSITION_NONE. If
      * notifyDataSetChanged is called for some other reason, the voicemail tab is recreated only if
      * it is active. All other tabs do not need to be recreated and POSITION_UNCHANGED is returned.
      */
     @Override
     public int getItemPosition(Object object) {
       return !mHasActiveVoicemailProvider && mFragments.indexOf(object) == TAB_INDEX_VOICEMAIL
           ? POSITION_NONE
           : POSITION_UNCHANGED;
     }

     @Override
     public int getCount() {
       return mHasActiveVoicemailProvider ? TAB_COUNT_WITH_VOICEMAIL : TAB_COUNT_DEFAULT;
     }

     @Override
     public CharSequence getPageTitle(int position) {
       return mTabTitles[position];
     }
   }
 }
	/*
	* Copyright (C) 2013 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.dialer.app.list;

	import android.app.Activity;
	import android.app.Fragment;
	import android.app.FragmentManager;
	import android.content.SharedPreferences;
	import android.database.ContentObserver;
	import android.database.Cursor;
	import android.os.Bundle;
	import android.os.Handler;
	import android.os.Trace;
	import android.preference.PreferenceManager;
	import android.provider.VoicemailContract;
	import android.support.annotation.Nullable;
	import android.support.v13.app.FragmentPagerAdapter;
	import android.support.v4.view.ViewPager;
	import android.support.v4.view.ViewPager.OnPageChangeListener;
	import android.support.v7.app.ActionBar;
	import android.support.v7.app.AppCompatActivity;
	import android.view.LayoutInflater;
	import android.view.View;
	import android.view.ViewGroup;
	import com.android.contacts.common.list.ViewPagerTabs;
	import com.android.dialer.app.R;
	import com.android.dialer.app.calllog.CallLogFragment;
	import com.android.dialer.app.calllog.CallLogNotificationsHelper;
	import com.android.dialer.app.calllog.VisualVoicemailCallLogFragment;
	import com.android.dialer.app.voicemail.error.VoicemailStatusCorruptionHandler;
	import com.android.dialer.app.voicemail.error.VoicemailStatusCorruptionHandler.Source;
	import com.android.dialer.app.widget.ActionBarController;
	import com.android.dialer.common.LogUtil;
	import com.android.dialer.database.CallLogQueryHandler;
	import com.android.dialer.logging.Logger;
	import com.android.dialer.logging.nano.DialerImpression;
	import com.android.dialer.logging.nano.ScreenEvent;
	import com.android.dialer.util.ViewUtil;
	import com.android.dialer.voicemailstatus.VisualVoicemailEnabledChecker;
	import com.android.dialer.voicemailstatus.VoicemailStatusHelper;
	import com.android.dialer.voicemailstatus.VoicemailStatusHelperImpl;
	import java.util.ArrayList;
	import java.util.List;

	/**
	* Fragment that is used as the main screen of the Dialer.
	*
	* <p>Contains a ViewPager that contains various contact lists like the Speed Dial list and the All
	* Contacts list. This will also eventually contain the logic that allows sliding the ViewPager
	* containing the lists up above the search bar and pin it against the top of the screen.
	*/
	public class ListsFragment extends Fragment
	implements ViewPager.OnPageChangeListener, CallLogQueryHandler.Listener {

	/** Every fragment in the list show implement this interface. */
	public interface ListsPage {

	/**
	* Called when the page is resumed, including selecting the page or activity resume. Note: This
	* is called before the page fragment is attached to a activity.
	*
	* @param activity the activity hosting the ListFragment
	*/
	void onPageResume(@Nullable Activity activity);

	/**
	* Called when the page is paused, including selecting another page or activity pause. Note:
	* This is called after the page fragment is detached from a activity.
	*
	* @param activity the activity hosting the ListFragment
	*/
	void onPagePause(@Nullable Activity activity);
	}

	public static final int TAB_INDEX_SPEED_DIAL = 0;
	public static final int TAB_INDEX_HISTORY = 1;
	public static final int TAB_INDEX_ALL_CONTACTS = 2;
	public static final int TAB_INDEX_VOICEMAIL = 3;
	public static final int TAB_COUNT_DEFAULT = 3;
	public static final int TAB_COUNT_WITH_VOICEMAIL = 4;
	private static final String TAG = "ListsFragment";
	private ActionBar mActionBar;
	private ViewPager mViewPager;
	private ViewPagerTabs mViewPagerTabs;
	private ViewPagerAdapter mViewPagerAdapter;
	private RemoveView mRemoveView;
	private View mRemoveViewContent;
	private SpeedDialFragment mSpeedDialFragment;
	private CallLogFragment mHistoryFragment;
	private AllContactsFragment mAllContactsFragment;
	private CallLogFragment mVoicemailFragment;
	private ListsPage mCurrentPage;
	private SharedPreferences mPrefs;
	private boolean mHasActiveVoicemailProvider;
	private boolean mHasFetchedVoicemailStatus;
	private boolean mShowVoicemailTabAfterVoicemailStatusIsFetched;
	private VoicemailStatusHelper mVoicemailStatusHelper;
	private ArrayList<OnPageChangeListener> mOnPageChangeListeners =
	new ArrayList<OnPageChangeListener>();
	private String[] mTabTitles;
	private int[] mTabIcons;
	/** The position of the currently selected tab. */
	private int mTabIndex = TAB_INDEX_SPEED_DIAL;

	private CallLogQueryHandler mCallLogQueryHandler;

	private final ContentObserver mVoicemailStatusObserver =
	new ContentObserver(new Handler()) {
	@Override
	public void onChange(boolean selfChange) {
	super.onChange(selfChange);
	mCallLogQueryHandler.fetchVoicemailStatus();
	}
	};

	@Override
	public void onCreate(Bundle savedInstanceState) {
	LogUtil.d("ListsFragment.onCreate", null);
	Trace.beginSection(TAG + " onCreate");
	super.onCreate(savedInstanceState);

	mVoicemailStatusHelper = new VoicemailStatusHelperImpl();
	mHasFetchedVoicemailStatus = false;

	mPrefs = PreferenceManager.getDefaultSharedPreferences(getActivity());
	mHasActiveVoicemailProvider =
	mPrefs.getBoolean(
	VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER, false);

	Trace.endSection();
	}

	@Override
	public void onResume() {
	LogUtil.d("ListsFragment.onResume", null);
	Trace.beginSection(TAG + " onResume");
	super.onResume();

	mActionBar = ((AppCompatActivity) getActivity()).getSupportActionBar();
	if (getUserVisibleHint()) {
	sendScreenViewForCurrentPosition();
	}

	// Fetch voicemail status to determine if we should show the voicemail tab.
	mCallLogQueryHandler =
	new CallLogQueryHandler(getActivity(), getActivity().getContentResolver(), this);
	mCallLogQueryHandler.fetchVoicemailStatus();
	mCallLogQueryHandler.fetchMissedCallsUnreadCount();
	Trace.endSection();
	mCurrentPage = getListsPage(mViewPager.getCurrentItem());
	if (mCurrentPage != null) {
	mCurrentPage.onPageResume(getActivity());
	}
	}

	@Override
	public void onPause() {
	LogUtil.d("ListsFragment.onPause", null);
	if (mCurrentPage != null) {
	mCurrentPage.onPagePause(getActivity());
	}
	super.onPause();
	}

	@Override
	public void onDestroyView() {
	super.onDestroyView();
	mViewPager.removeOnPageChangeListener(this);
	}

	@Override
	public View onCreateView(
	LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
	LogUtil.d("ListsFragment.onCreateView", null);
	Trace.beginSection(TAG + " onCreateView");
	Trace.beginSection(TAG + " inflate view");
	final View parentView = inflater.inflate(R.layout.lists_fragment, container, false);
	Trace.endSection();
	Trace.beginSection(TAG + " setup views");
	mViewPager = (ViewPager) parentView.findViewById(R.id.lists_pager);
	mViewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());
	mViewPager.setAdapter(mViewPagerAdapter);
	mViewPager.setOffscreenPageLimit(TAB_COUNT_WITH_VOICEMAIL - 1);
	mViewPager.addOnPageChangeListener(this);
	showTab(TAB_INDEX_SPEED_DIAL);

	mTabTitles = new String[TAB_COUNT_WITH_VOICEMAIL];
	mTabTitles[TAB_INDEX_SPEED_DIAL] = getResources().getString(R.string.tab_speed_dial);
	mTabTitles[TAB_INDEX_HISTORY] = getResources().getString(R.string.tab_history);
	mTabTitles[TAB_INDEX_ALL_CONTACTS] = getResources().getString(R.string.tab_all_contacts);
	mTabTitles[TAB_INDEX_VOICEMAIL] = getResources().getString(R.string.tab_voicemail);

	mTabIcons = new int[TAB_COUNT_WITH_VOICEMAIL];
	mTabIcons[TAB_INDEX_SPEED_DIAL] = R.drawable.ic_grade_24dp;
	mTabIcons[TAB_INDEX_HISTORY] = R.drawable.ic_schedule_24dp;
	mTabIcons[TAB_INDEX_ALL_CONTACTS] = R.drawable.ic_people_24dp;
	mTabIcons[TAB_INDEX_VOICEMAIL] = R.drawable.ic_voicemail_24dp;

	mViewPagerTabs = (ViewPagerTabs) parentView.findViewById(R.id.lists_pager_header);
	mViewPagerTabs.configureTabIcons(mTabIcons);
	mViewPagerTabs.setViewPager(mViewPager);
	addOnPageChangeListener(mViewPagerTabs);

	mRemoveView = (RemoveView) parentView.findViewById(R.id.remove_view);
	mRemoveViewContent = parentView.findViewById(R.id.remove_view_content);

	getActivity()
	.getContentResolver()
	.registerContentObserver(
	VoicemailContract.Status.CONTENT_URI, true, mVoicemailStatusObserver);

	Trace.endSection();
	Trace.endSection();
	return parentView;
	}

	@Override
	public void onDestroy() {
	getActivity().getContentResolver().unregisterContentObserver(mVoicemailStatusObserver);
	super.onDestroy();
	}

	public void addOnPageChangeListener(OnPageChangeListener onPageChangeListener) {
	if (!mOnPageChangeListeners.contains(onPageChangeListener)) {
	mOnPageChangeListeners.add(onPageChangeListener);
	}
	}

	/**
	* Shows the tab with the specified index. If the voicemail tab index is specified, but the
	* voicemail status hasn't been fetched, it will try to show the tab after the voicemail status
	* has been fetched.
	*/
	public void showTab(int index) {
	if (index == TAB_INDEX_VOICEMAIL) {
	if (mHasActiveVoicemailProvider) {
	Logger.get(getContext()).logImpression(DialerImpression.Type.VVM_TAB_VISIBLE);
	mViewPager.setCurrentItem(getRtlPosition(TAB_INDEX_VOICEMAIL));
	} else if (!mHasFetchedVoicemailStatus) {
	// Try to show the voicemail tab after the voicemail status returns.
	mShowVoicemailTabAfterVoicemailStatusIsFetched = true;
	}
	} else if (index < getTabCount()) {
	mViewPager.setCurrentItem(getRtlPosition(index));
	}
	}

	@Override
	public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
	mTabIndex = getRtlPosition(position);

	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) {
	LogUtil.i("ListsFragment.onPageSelected", "position: %d", position);
	mTabIndex = getRtlPosition(position);

	// Show the tab which has been selected instead.
	mShowVoicemailTabAfterVoicemailStatusIsFetched = false;

	final int count = mOnPageChangeListeners.size();
	for (int i = 0; i < count; i++) {
	mOnPageChangeListeners.get(i).onPageSelected(position);
	}
	sendScreenViewForCurrentPosition();

	if (mCurrentPage != null) {
	mCurrentPage.onPagePause(getActivity());
	}
	mCurrentPage = getListsPage(position);
	if (mCurrentPage != null) {
	mCurrentPage.onPageResume(getActivity());
	}
	}

	@Override
	public void onPageScrollStateChanged(int state) {
	final int count = mOnPageChangeListeners.size();
	for (int i = 0; i < count; i++) {
	mOnPageChangeListeners.get(i).onPageScrollStateChanged(state);
	}
	}

	@Override
	public void onVoicemailStatusFetched(Cursor statusCursor) {
	mHasFetchedVoicemailStatus = true;

	if (getActivity() == null \|\| getActivity().isFinishing()) {
	return;
	}

	VoicemailStatusCorruptionHandler.maybeFixVoicemailStatus(
	getContext(), statusCursor, Source.Activity);

	// Update mHasActiveVoicemailProvider, which controls the number of tabs displayed.
	boolean hasActiveVoicemailProvider =
	mVoicemailStatusHelper.getNumberActivityVoicemailSources(statusCursor) > 0;
	if (hasActiveVoicemailProvider != mHasActiveVoicemailProvider) {
	mHasActiveVoicemailProvider = hasActiveVoicemailProvider;
	mViewPagerAdapter.notifyDataSetChanged();

	if (hasActiveVoicemailProvider) {
	mViewPagerTabs.updateTab(TAB_INDEX_VOICEMAIL);
	} else {
	mViewPagerTabs.removeTab(TAB_INDEX_VOICEMAIL);
	removeVoicemailFragment();
	}

	mPrefs
	.edit()
	.putBoolean(
	VisualVoicemailEnabledChecker.PREF_KEY_HAS_ACTIVE_VOICEMAIL_PROVIDER,
	hasActiveVoicemailProvider)
	.commit();
	}

	if (hasActiveVoicemailProvider) {
	mCallLogQueryHandler.fetchVoicemailUnreadCount();
	}

	if (mHasActiveVoicemailProvider && mShowVoicemailTabAfterVoicemailStatusIsFetched) {
	mShowVoicemailTabAfterVoicemailStatusIsFetched = false;
	showTab(TAB_INDEX_VOICEMAIL);
	}
	}

	@Override
	public void onVoicemailUnreadCountFetched(Cursor cursor) {
	if (getActivity() == null \|\| getActivity().isFinishing() \|\| cursor == null) {
	return;
	}

	int count = 0;
	try {
	count = cursor.getCount();
	} finally {
	cursor.close();
	}

	mViewPagerTabs.setUnreadCount(count, TAB_INDEX_VOICEMAIL);
	mViewPagerTabs.updateTab(TAB_INDEX_VOICEMAIL);
	}

	@Override
	public void onMissedCallsUnreadCountFetched(Cursor cursor) {
	if (getActivity() == null \|\| getActivity().isFinishing() \|\| cursor == null) {
	return;
	}

	int count = 0;
	try {
	count = cursor.getCount();
	} finally {
	cursor.close();
	}

	mViewPagerTabs.setUnreadCount(count, TAB_INDEX_HISTORY);
	mViewPagerTabs.updateTab(TAB_INDEX_HISTORY);
	}

	@Override
	public boolean onCallsFetched(Cursor statusCursor) {
	// Return false; did not take ownership of cursor
	return false;
	}

	public int getCurrentTabIndex() {
	return mTabIndex;
	}

	/**
	* External method to update unread count because the unread count changes when the user expands a
	* voicemail in the call log or when the user expands an unread call in the call history tab.
	*/
	public void updateTabUnreadCounts() {
	if (mCallLogQueryHandler != null) {
	mCallLogQueryHandler.fetchMissedCallsUnreadCount();
	if (mHasActiveVoicemailProvider) {
	mCallLogQueryHandler.fetchVoicemailUnreadCount();
	}
	}
	}

	/** External method to mark all missed calls as read. */
	public void markMissedCallsAsReadAndRemoveNotifications() {
	if (mCallLogQueryHandler != null) {
	mCallLogQueryHandler.markMissedCallsAsRead();
	CallLogNotificationsHelper.removeMissedCallNotifications(getActivity());
	}
	}

	public void showRemoveView(boolean show) {
	mRemoveViewContent.setVisibility(show ? View.VISIBLE : View.GONE);
	mRemoveView.setAlpha(show ? 0 : 1);
	mRemoveView.animate().alpha(show ? 1 : 0).start();
	}

	public boolean shouldShowActionBar() {
	// TODO: Update this based on scroll state.
	return mActionBar != null;
	}

	public SpeedDialFragment getSpeedDialFragment() {
	return mSpeedDialFragment;
	}

	public RemoveView getRemoveView() {
	return mRemoveView;
	}

	public int getTabCount() {
	return mViewPagerAdapter.getCount();
	}

	private int getRtlPosition(int position) {
	if (ViewUtil.isRtl()) {
	return mViewPagerAdapter.getCount() - 1 - position;
	}
	return position;
	}

	public void sendScreenViewForCurrentPosition() {
	if (!isResumed()) {
	return;
	}

	int screenType;
	switch (getCurrentTabIndex()) {
	case TAB_INDEX_SPEED_DIAL:
	screenType = ScreenEvent.Type.SPEED_DIAL;
	break;
	case TAB_INDEX_HISTORY:
	screenType = ScreenEvent.Type.CALL_LOG;
	break;
	case TAB_INDEX_ALL_CONTACTS:
	screenType = ScreenEvent.Type.ALL_CONTACTS;
	break;
	case TAB_INDEX_VOICEMAIL:
	screenType = ScreenEvent.Type.VOICEMAIL_LOG;
	break;
	default:
	return;
	}
	Logger.get(getActivity()).logScreenView(screenType, getActivity());
	}

	private void removeVoicemailFragment() {
	if (mVoicemailFragment != null) {
	getChildFragmentManager()
	.beginTransaction()
	.remove(mVoicemailFragment)
	.commitAllowingStateLoss();
	mVoicemailFragment = null;
	}
	}

	private ListsPage getListsPage(int position) {
	switch (getRtlPosition(position)) {
	case TAB_INDEX_SPEED_DIAL:
	return mSpeedDialFragment;
	case TAB_INDEX_HISTORY:
	return mHistoryFragment;
	case TAB_INDEX_ALL_CONTACTS:
	return mAllContactsFragment;
	case TAB_INDEX_VOICEMAIL:
	return mVoicemailFragment;
	}
	throw new IllegalStateException("No fragment at position " + position);
	}

	public interface HostInterface {

	ActionBarController getActionBarController();
	}

	public class ViewPagerAdapter extends FragmentPagerAdapter {

	private final List<Fragment> mFragments = new ArrayList<>();

	public ViewPagerAdapter(FragmentManager fm) {
	super(fm);
	for (int i = 0; i < TAB_COUNT_WITH_VOICEMAIL; i++) {
	mFragments.add(null);
	}
	}

	@Override
	public long getItemId(int position) {
	return getRtlPosition(position);
	}

	@Override
	public Fragment getItem(int position) {
	LogUtil.d("ViewPagerAdapter.getItem", "position: %d", position);
	switch (getRtlPosition(position)) {
	case TAB_INDEX_SPEED_DIAL:
	if (mSpeedDialFragment == null) {
	mSpeedDialFragment = new SpeedDialFragment();
	}
	return mSpeedDialFragment;
	case TAB_INDEX_HISTORY:
	if (mHistoryFragment == null) {
	mHistoryFragment = new CallLogFragment();
	}
	return mHistoryFragment;
	case TAB_INDEX_ALL_CONTACTS:
	if (mAllContactsFragment == null) {
	mAllContactsFragment = new AllContactsFragment();
	}
	return mAllContactsFragment;
	case TAB_INDEX_VOICEMAIL:
	if (mVoicemailFragment == null) {
	mVoicemailFragment = new VisualVoicemailCallLogFragment();
	LogUtil.v(
	"ViewPagerAdapter.getItem",
	"new VisualVoicemailCallLogFragment: %s",
	mVoicemailFragment);
	}
	return mVoicemailFragment;
	}
	throw new IllegalStateException("No fragment at position " + position);
	}

	@Override
	public Fragment instantiateItem(ViewGroup container, int position) {
	LogUtil.d("ViewPagerAdapter.instantiateItem", "position: %d", position);
	// On rotation the FragmentManager handles rotation. Therefore getItem() isn't called.
	// Copy the fragments that the FragmentManager finds so that we can store them in
	// instance variables for later.
	final Fragment fragment = (Fragment) super.instantiateItem(container, position);
	if (fragment instanceof SpeedDialFragment) {
	mSpeedDialFragment = (SpeedDialFragment) fragment;
	} else if (fragment instanceof CallLogFragment && position == TAB_INDEX_HISTORY) {
	mHistoryFragment = (CallLogFragment) fragment;
	} else if (fragment instanceof AllContactsFragment) {
	mAllContactsFragment = (AllContactsFragment) fragment;
	} else if (fragment instanceof CallLogFragment && position == TAB_INDEX_VOICEMAIL) {
	mVoicemailFragment = (CallLogFragment) fragment;
	LogUtil.v("ViewPagerAdapter.instantiateItem", mVoicemailFragment.toString());
	}
	mFragments.set(position, fragment);
	return fragment;
	}

	/**
	* When {@link android.support.v4.view.PagerAdapter#notifyDataSetChanged} is called, this method
	* is called on all pages to determine whether they need to be recreated. When the voicemail tab
	* is removed, the view needs to be recreated by returning POSITION_NONE. If
	* notifyDataSetChanged is called for some other reason, the voicemail tab is recreated only if
	* it is active. All other tabs do not need to be recreated and POSITION_UNCHANGED is returned.
	*/
	@Override
	public int getItemPosition(Object object) {
	return !mHasActiveVoicemailProvider && mFragments.indexOf(object) == TAB_INDEX_VOICEMAIL
	? POSITION_NONE
	: POSITION_UNCHANGED;
	}

	@Override
	public int getCount() {
	return mHasActiveVoicemailProvider ? TAB_COUNT_WITH_VOICEMAIL : TAB_COUNT_DEFAULT;
	}

	@Override
	public CharSequence getPageTitle(int position) {
	return mTabTitles[position];
	}
	}
	}