src/com/android/dialer/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.list;

 import android.app.Fragment;
 import android.app.FragmentManager;
 import android.content.SharedPreferences;
 import android.database.Cursor;
 import android.os.Bundle;
 import android.os.Trace;
 import android.preference.PreferenceManager;
 import android.provider.CallLog.Calls;
 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.DialtactsActivity;
 import com.android.dialer.R;
 import com.android.dialer.calllog.CallLogFragment;
 import com.android.dialer.calllog.CallLogNotificationsHelper;
 import com.android.dialer.calllog.CallLogQueryHandler;
 import com.android.dialer.calllog.VisualVoicemailCallLogFragment;
 import com.android.dialer.logging.Logger;
 import com.android.dialer.logging.ScreenEvent;
 import com.android.dialer.util.DialerUtils;
 import com.android.dialer.voicemail.VisualVoicemailEnabledChecker;
 import com.android.dialer.voicemail.VoicemailStatusHelper;
 import com.android.dialer.voicemail.VoicemailStatusHelperImpl;
 import com.android.dialer.widget.ActionBarController;

 import java.util.ArrayList;
 import java.util.List;

 /**
  * Fragment that is used as the main screen of the Dialer.
  *
  * 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 {

     private static final boolean DEBUG = DialtactsActivity.DEBUG;
     private static final String TAG = "ListsFragment";

     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;

     public interface HostInterface {
         public ActionBarController getActionBarController();
     }

     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 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;

     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) {
             switch (getRtlPosition(position)) {
                 case TAB_INDEX_SPEED_DIAL:
                     mSpeedDialFragment = new SpeedDialFragment();
                     return mSpeedDialFragment;
                 case TAB_INDEX_HISTORY:
                     mHistoryFragment = new CallLogFragment(CallLogQueryHandler.CALL_TYPE_ALL);
                     return mHistoryFragment;
                 case TAB_INDEX_ALL_CONTACTS:
                     mAllContactsFragment = new AllContactsFragment();
                     return mAllContactsFragment;
                 case TAB_INDEX_VOICEMAIL:
                     mVoicemailFragment = new VisualVoicemailCallLogFragment();
                     return mVoicemailFragment;
             }
             throw new IllegalStateException("No fragment at position " + position);
         }

         @Override
         public Fragment instantiateItem(ViewGroup container, int 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;
             }
             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];
         }
     }

     @Override
     public void onCreate(Bundle savedInstanceState) {
         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() {
         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();
     }

     @Override
     public View onCreateView(LayoutInflater inflater, ViewGroup container,
             Bundle savedInstanceState) {
         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.setOnPageChangeListener(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);

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

     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) {
                 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) {
         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();
     }

     @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;
         }

         // 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 (DialerUtils.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.SPEED_DIAL;
                 break;
             case TAB_INDEX_HISTORY:
                 screenType = ScreenEvent.CALL_LOG;
                 break;
             case TAB_INDEX_ALL_CONTACTS:
                 screenType = ScreenEvent.ALL_CONTACTS;
                 break;
             case TAB_INDEX_VOICEMAIL:
                 screenType = ScreenEvent.VOICEMAIL_LOG;
             default:
                 return;
         }
         Logger.logScreenView(screenType, getActivity());
     }

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

	import android.app.Fragment;
	import android.app.FragmentManager;
	import android.content.SharedPreferences;
	import android.database.Cursor;
	import android.os.Bundle;
	import android.os.Trace;
	import android.preference.PreferenceManager;
	import android.provider.CallLog.Calls;
	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.DialtactsActivity;
	import com.android.dialer.R;
	import com.android.dialer.calllog.CallLogFragment;
	import com.android.dialer.calllog.CallLogNotificationsHelper;
	import com.android.dialer.calllog.CallLogQueryHandler;
	import com.android.dialer.calllog.VisualVoicemailCallLogFragment;
	import com.android.dialer.logging.Logger;
	import com.android.dialer.logging.ScreenEvent;
	import com.android.dialer.util.DialerUtils;
	import com.android.dialer.voicemail.VisualVoicemailEnabledChecker;
	import com.android.dialer.voicemail.VoicemailStatusHelper;
	import com.android.dialer.voicemail.VoicemailStatusHelperImpl;
	import com.android.dialer.widget.ActionBarController;

	import java.util.ArrayList;
	import java.util.List;

	/**
	* Fragment that is used as the main screen of the Dialer.
	*
	* 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 {

	private static final boolean DEBUG = DialtactsActivity.DEBUG;
	private static final String TAG = "ListsFragment";

	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;

	public interface HostInterface {
	public ActionBarController getActionBarController();
	}

	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 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;

	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) {
	switch (getRtlPosition(position)) {
	case TAB_INDEX_SPEED_DIAL:
	mSpeedDialFragment = new SpeedDialFragment();
	return mSpeedDialFragment;
	case TAB_INDEX_HISTORY:
	mHistoryFragment = new CallLogFragment(CallLogQueryHandler.CALL_TYPE_ALL);
	return mHistoryFragment;
	case TAB_INDEX_ALL_CONTACTS:
	mAllContactsFragment = new AllContactsFragment();
	return mAllContactsFragment;
	case TAB_INDEX_VOICEMAIL:
	mVoicemailFragment = new VisualVoicemailCallLogFragment();
	return mVoicemailFragment;
	}
	throw new IllegalStateException("No fragment at position " + position);
	}

	@Override
	public Fragment instantiateItem(ViewGroup container, int 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;
	}
	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];
	}
	}

	@Override
	public void onCreate(Bundle savedInstanceState) {
	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() {
	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();
	}

	@Override
	public View onCreateView(LayoutInflater inflater, ViewGroup container,
	Bundle savedInstanceState) {
	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.setOnPageChangeListener(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);

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

	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) {
	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) {
	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();
	}

	@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;
	}

	// 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 (DialerUtils.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.SPEED_DIAL;
	break;
	case TAB_INDEX_HISTORY:
	screenType = ScreenEvent.CALL_LOG;
	break;
	case TAB_INDEX_ALL_CONTACTS:
	screenType = ScreenEvent.ALL_CONTACTS;
	break;
	case TAB_INDEX_VOICEMAIL:
	screenType = ScreenEvent.VOICEMAIL_LOG;
	default:
	return;
	}
	Logger.logScreenView(screenType, getActivity());
	}

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