Java tutorial
/* * Copyright (C) 2014 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.example.chu.googleplaylibrary.ui; import android.app.FragmentManager; import android.os.Bundle; import android.os.Handler; import android.support.v7.app.AppCompatActivity; import android.support.v7.app.MediaRouteButton; import android.support.v7.widget.Toolbar; import android.view.Menu; import android.view.MenuItem; import android.view.View; import com.example.chu.googleplaylibrary.R; import com.example.chu.googleplaylibrary.utils.LogHelper; import com.google.android.libraries.cast.companionlibrary.cast.VideoCastManager; import com.google.android.libraries.cast.companionlibrary.cast.callbacks.VideoCastConsumerImpl; import com.google.android.libraries.cast.companionlibrary.widgets.IntroductoryOverlay; /** * Abstract activity with toolbar, navigation drawer and cast support. Needs to be extended by * any activity that wants to be shown as a top level activity. * <p/> * The requirements for a subclass is to call {@link #initializeToolbar()} on onCreate, after * setContentView() is called and have three mandatory layout elements: * a {@link android.support.v7.widget.Toolbar} with id 'toolbar', * a {@link android.support.v4.widget.DrawerLayout} with id 'drawerLayout' and * a {@link android.widget.ListView} with id 'drawerList'. */ public abstract class ActionBarCastActivity extends AppCompatActivity { private static final String TAG = LogHelper.makeLogTag(ActionBarCastActivity.class); private static final int DELAY_MILLIS = 1000; private VideoCastManager mCastManager; private MenuItem mMediaRouteMenuItem; private Toolbar mToolbar; private boolean mToolbarInitialized; private final VideoCastConsumerImpl mCastConsumer = new VideoCastConsumerImpl() { @Override public void onFailed(int resourceId, int statusCode) { LogHelper.d(TAG, "onFailed ", resourceId, " status ", statusCode); } @Override public void onConnectionSuspended(int cause) { LogHelper.d(TAG, "onConnectionSuspended() was called with cause: ", cause); } @Override public void onConnectivityRecovered() { } @Override public void onCastAvailabilityChanged(boolean castPresent) { if (castPresent) { new Handler().postDelayed(new Runnable() { @Override public void run() { if (mMediaRouteMenuItem.isVisible()) { LogHelper.d(TAG, "Cast Icon is visible"); showFtu(); } } }, DELAY_MILLIS); } } }; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LogHelper.d(TAG, "Activity onCreate"); // Ensure that Google Play Service is available. VideoCastManager.checkGooglePlayServices(this); mCastManager = VideoCastManager.getInstance(); mCastManager.reconnectSessionIfPossible(); } @Override protected void onStart() { super.onStart(); if (!mToolbarInitialized) { throw new IllegalStateException( "You must run super.initializeToolbar at " + "the end of your onCreate method"); } } @Override public void onResume() { super.onResume(); mCastManager.addVideoCastConsumer(mCastConsumer); mCastManager.incrementUiCounter(); // Whenever the fragment back stack changes, we may need to update the // action bar toggle: only top level screens show the hamburger-like icon, inner // screens - either Activities or fragments - show the "Up" icon instead. } @Override public void onPause() { super.onPause(); mCastManager.removeVideoCastConsumer(mCastConsumer); mCastManager.decrementUiCounter(); } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); getMenuInflater().inflate(R.menu.main, menu); mMediaRouteMenuItem = mCastManager.addMediaRouterButton(menu, R.id.media_route_menu_item); return true; } @Override public void onBackPressed() { // If the drawer is open, back will close it // Otherwise, it may return to the previous fragment stack FragmentManager fragmentManager = getFragmentManager(); if (fragmentManager.getBackStackEntryCount() > 0) { fragmentManager.popBackStack(); } else { // Lastly, it will rely on the system behavior for back super.onBackPressed(); } } @Override public void setTitle(CharSequence title) { super.setTitle(title); mToolbar.setTitle(title); } @Override public void setTitle(int titleId) { super.setTitle(titleId); mToolbar.setTitle(titleId); } protected void initializeToolbar() { mToolbar = (Toolbar) findViewById(R.id.toolbar); if (mToolbar == null) { throw new IllegalStateException("Layout is required to include a Toolbar with id " + "'toolbar'"); } mToolbar.inflateMenu(R.menu.main); setSupportActionBar(mToolbar); mToolbarInitialized = true; } /** * Shows the Cast First Time User experience to the user (an overlay that explains what is * the Cast icon) */ private void showFtu() { Menu menu = mToolbar.getMenu(); View view = menu.findItem(R.id.media_route_menu_item).getActionView(); if (view != null && view instanceof MediaRouteButton) { IntroductoryOverlay overlay = new IntroductoryOverlay.Builder(this).setMenuItem(mMediaRouteMenuItem) .setTitleText(R.string.touch_to_cast).setSingleTime().build(); overlay.show(); } } }