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.chinaftw.music.ui; import android.app.ActivityOptions; import android.app.FragmentManager; import android.content.Intent; import android.content.res.Configuration; import android.graphics.Color; import android.os.Bundle; import android.os.Handler; import android.support.v4.widget.DrawerLayout; import android.support.v7.app.ActionBarActivity; import android.support.v7.app.ActionBarDrawerToggle; import android.support.v7.app.MediaRouteButton; import android.support.v7.media.MediaRouter; import android.support.v7.widget.Toolbar; import android.view.Gravity; import android.view.Menu; import android.view.MenuItem; import android.view.View; import android.view.ViewGroup; import android.widget.AdapterView; import android.widget.ListView; import android.widget.SimpleAdapter; import com.chinaftw.music.api.MusicAPI; import com.chinaftw.music.R; import com.chinaftw.music.utils.LogHelper; import com.chinaftw.music.utils.PrefUtils; import com.chinaftw.music.utils.ResourceHelper; import com.github.amlcurran.showcaseview.ShowcaseView; import com.github.amlcurran.showcaseview.targets.ViewTarget; import com.google.android.libraries.cast.companionlibrary.cast.VideoCastManager; import com.google.android.libraries.cast.companionlibrary.cast.callbacks.VideoCastConsumerImpl; import org.json.JSONObject; /** * 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. * * 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 ActionBarActivity { 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 ActionBarDrawerToggle mDrawerToggle; private DrawerLayout mDrawerLayout; private ListView mDrawerList; private DrawerMenuContents mDrawerMenuContents; private boolean mToolbarInitialized; private int mItemToOpenWhenDrawerCloses = -1; private 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 onCastDeviceDetected(final MediaRouter.RouteInfo info) { // FTU stands for First Time Use: if (!PrefUtils.isFtuShown(ActionBarCastActivity.this)) { // If user is seeing the cast button for the first time, we will // show an overlay that explains what that button means. PrefUtils.setFtuShown(ActionBarCastActivity.this, true); LogHelper.d(TAG, "Route is visible: ", info); new Handler().postDelayed(new Runnable() { @Override public void run() { if (mMediaRouteMenuItem.isVisible()) { LogHelper.d(TAG, "Cast Icon is visible: ", info.getName()); showFtu(); } } }, DELAY_MILLIS); } } }; private DrawerLayout.DrawerListener mDrawerListener = new DrawerLayout.DrawerListener() { @Override public void onDrawerClosed(View drawerView) { if (mDrawerToggle != null) mDrawerToggle.onDrawerClosed(drawerView); int position = mItemToOpenWhenDrawerCloses; if (position >= 0) { Bundle extras = ActivityOptions .makeCustomAnimation(ActionBarCastActivity.this, R.anim.fade_in, R.anim.fade_out) .toBundle(); Class activityClass = mDrawerMenuContents.getActivity(position); startActivity(new Intent(ActionBarCastActivity.this, activityClass), extras); } } @Override public void onDrawerStateChanged(int newState) { if (mDrawerToggle != null) mDrawerToggle.onDrawerStateChanged(newState); } @Override public void onDrawerSlide(View drawerView, float slideOffset) { if (mDrawerToggle != null) mDrawerToggle.onDrawerSlide(drawerView, slideOffset); } @Override public void onDrawerOpened(View drawerView) { if (mDrawerToggle != null) mDrawerToggle.onDrawerOpened(drawerView); getSupportActionBar().setTitle(R.string.app_name); } }; private FragmentManager.OnBackStackChangedListener mBackStackChangedListener = new FragmentManager.OnBackStackChangedListener() { @Override public void onBackStackChanged() { updateDrawerToggle(); } }; @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 protected void onPostCreate(Bundle savedInstanceState) { super.onPostCreate(savedInstanceState); if (mDrawerToggle != null) { mDrawerToggle.syncState(); } } @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. getFragmentManager().addOnBackStackChangedListener(mBackStackChangedListener); } @Override public void onConfigurationChanged(Configuration newConfig) { super.onConfigurationChanged(newConfig); if (mDrawerToggle != null) { mDrawerToggle.onConfigurationChanged(newConfig); } } @Override public void onPause() { super.onPause(); mCastManager.removeVideoCastConsumer(mCastConsumer); mCastManager.decrementUiCounter(); getFragmentManager().removeOnBackStackChangedListener(mBackStackChangedListener); } @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 boolean onOptionsItemSelected(MenuItem item) { if (mDrawerToggle != null && mDrawerToggle.onOptionsItemSelected(item)) { return true; } // If not handled by drawerToggle, home needs to be handled by returning to previous if (item != null && item.getItemId() == android.R.id.home) { onBackPressed(); return true; } return super.onOptionsItemSelected(item); } @Override public void onBackPressed() { // If the drawer is open, back will close it if (mDrawerLayout != null && mDrawerLayout.isDrawerOpen(Gravity.START)) { mDrawerLayout.closeDrawers(); return; } // 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); mDrawerLayout = (DrawerLayout) findViewById(R.id.drawerLayout); if (mDrawerLayout != null) { mDrawerList = (ListView) findViewById(R.id.drawer_list); if (mDrawerList == null) { throw new IllegalStateException( "A layout with a drawerLayout is required to" + "include a ListView with id 'drawerList'"); } // Create an ActionBarDrawerToggle that will handle opening/closing of the drawer: mDrawerToggle = new ActionBarDrawerToggle(this, mDrawerLayout, mToolbar, R.string.open_content_drawer, R.string.close_content_drawer); mDrawerLayout.setDrawerListener(mDrawerListener); mDrawerLayout.setStatusBarBackgroundColor( ResourceHelper.getThemeColor(this, R.attr.colorPrimary, android.R.color.black)); populateDrawerItems(); setSupportActionBar(mToolbar); updateDrawerToggle(); } else { setSupportActionBar(mToolbar); } mToolbarInitialized = true; } private void populateDrawerItems() { mDrawerMenuContents = new DrawerMenuContents(this); final int selectedPosition = mDrawerMenuContents.getPosition(this.getClass()); final int unselectedColor = Color.WHITE; final int selectedColor = getResources().getColor(R.color.drawer_item_selected_background); SimpleAdapter adapter = new SimpleAdapter(this, mDrawerMenuContents.getItems(), R.layout.drawer_list_item, new String[] { DrawerMenuContents.FIELD_TITLE, DrawerMenuContents.FIELD_ICON }, new int[] { R.id.drawer_item_title, R.id.drawer_item_icon }) { @Override public View getView(int position, View convertView, ViewGroup parent) { View view = super.getView(position, convertView, parent); int color = unselectedColor; if (position == selectedPosition) { color = selectedColor; } view.setBackgroundColor(color); return view; } }; mDrawerList.setOnItemClickListener(new AdapterView.OnItemClickListener() { @Override public void onItemClick(AdapterView<?> parent, View view, int position, long id) { if (position != selectedPosition) { view.setBackgroundColor(getResources().getColor(R.color.drawer_item_selected_background)); mItemToOpenWhenDrawerCloses = position; } mDrawerLayout.closeDrawers(); } }); mDrawerList.setAdapter(adapter); } protected void updateDrawerToggle() { if (mDrawerToggle == null) { return; } boolean isRoot = getFragmentManager().getBackStackEntryCount() == 0; mDrawerToggle.setDrawerIndicatorEnabled(isRoot); getSupportActionBar().setDisplayShowHomeEnabled(!isRoot); getSupportActionBar().setDisplayHomeAsUpEnabled(!isRoot); getSupportActionBar().setHomeButtonEnabled(!isRoot); if (isRoot) { mDrawerToggle.syncState(); } } /** * 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) { new ShowcaseView.Builder(this).setTarget(new ViewTarget(view)).setContentTitle(R.string.touch_to_cast) .hideOnTouchOutside().build(); } } }