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.bayapps.android.robophish.ui; import android.app.ActivityManager; import android.content.BroadcastReceiver; import android.content.ComponentName; import android.content.Context; import android.content.Intent; import android.content.IntentFilter; import android.content.SharedPreferences; import android.graphics.BitmapFactory; import android.os.Build; import android.os.Bundle; import android.os.RemoteException; import android.preference.PreferenceManager; import android.support.annotation.NonNull; import android.support.v4.content.LocalBroadcastManager; import android.support.v4.media.MediaBrowserCompat; import android.support.v4.media.MediaMetadataCompat; import android.support.v4.media.session.MediaControllerCompat; import android.support.v4.media.session.MediaSessionCompat; import android.support.v4.media.session.PlaybackStateCompat; import android.util.Log; import com.bayapps.android.robophish.MusicService; import com.bayapps.android.robophish.R; import com.bayapps.android.robophish.utils.LogHelper; import com.bayapps.android.robophish.utils.NetworkHelper; import com.bayapps.android.robophish.gcm.QuickstartPreferences; import com.bayapps.android.robophish.gcm.RegistrationIntentService; import com.bayapps.android.robophish.utils.ResourceHelper; import com.google.android.gms.common.ConnectionResult; import com.google.android.gms.common.GoogleApiAvailability; /** * Base activity for activities that need to show a playback control fragment when media is playing. */ public abstract class BaseActivity extends ActionBarCastActivity implements MediaBrowserProvider { private static final String TAG = LogHelper.makeLogTag(BaseActivity.class); private static final int PLAY_SERVICES_RESOLUTION_REQUEST = 9000; private MediaBrowserCompat mMediaBrowser; private PlaybackControlsFragment mControlsFragment; private BroadcastReceiver mRegistrationBroadcastReceiver; private boolean isReceiverRegistered; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); LogHelper.d(TAG, "Activity onCreate"); if (Build.VERSION.SDK_INT >= 21) { // Since our app icon has the same color as colorPrimary, our entry in the Recent Apps // list gets weird. We need to change either the icon or the color // of the TaskDescription. ActivityManager.TaskDescription taskDesc = new ActivityManager.TaskDescription(getTitle().toString(), BitmapFactory.decodeResource(getResources(), R.drawable.ic_launcher_white), ResourceHelper.getThemeColor(this, R.attr.colorPrimary, android.R.color.darker_gray)); setTaskDescription(taskDesc); } // Connect a media browser just to get the media session token. There are other ways // this can be done, for example by sharing the session token directly. mMediaBrowser = new MediaBrowserCompat(this, new ComponentName(this, MusicService.class), mConnectionCallback, null); mRegistrationBroadcastReceiver = new BroadcastReceiver() { @Override public void onReceive(Context context, Intent intent) { //mRegistrationProgressBar.setVisibility(ProgressBar.GONE); SharedPreferences sharedPreferences = PreferenceManager.getDefaultSharedPreferences(context); boolean sentToken = sharedPreferences.getBoolean(QuickstartPreferences.SENT_TOKEN_TO_SERVER, false); if (sentToken) { //mInformationTextView.setText(getString(R.string.gcm_send_message)); } else { //mInformationTextView.setText(getString(R.string.token_error_message)); } } }; // Registering BroadcastReceiver registerReceiver(); if (checkPlayServices()) { // Start IntentService to register this application with GCM. Intent intent = new Intent(this, RegistrationIntentService.class); startService(intent); } } private void registerReceiver() { if (!isReceiverRegistered) { LocalBroadcastManager.getInstance(this).registerReceiver(mRegistrationBroadcastReceiver, new IntentFilter(QuickstartPreferences.REGISTRATION_COMPLETE)); isReceiverRegistered = true; } } /** * Check the device to make sure it has the Google Play Services APK. If * it doesn't, display a dialog that allows users to download the APK from * the Google Play Store or enable it in the device's system settings. */ private boolean checkPlayServices() { GoogleApiAvailability apiAvailability = GoogleApiAvailability.getInstance(); int resultCode = apiAvailability.isGooglePlayServicesAvailable(this); if (resultCode == ConnectionResult.SUCCESS) { return true; } return false; //just don't start RegistrationIntentService if not available } @Override protected void onStart() { super.onStart(); LogHelper.d(TAG, "Activity onStart"); mControlsFragment = (PlaybackControlsFragment) getFragmentManager() .findFragmentById(R.id.fragment_playback_controls); if (mControlsFragment == null) { throw new IllegalStateException("Mising fragment with id 'controls'. Cannot continue."); } hidePlaybackControls(); mMediaBrowser.connect(); } @Override protected void onStop() { super.onStop(); LogHelper.d(TAG, "Activity onStop"); if (getSupportMediaController() != null) { getSupportMediaController().unregisterCallback(mMediaControllerCallback); } mMediaBrowser.disconnect(); } @Override public MediaBrowserCompat getMediaBrowser() { return mMediaBrowser; } protected void onMediaControllerConnected() { // empty implementation, can be overridden by clients. } protected void showPlaybackControls() { LogHelper.d(TAG, "showPlaybackControls"); if (NetworkHelper.isOnline(this)) { getFragmentManager().beginTransaction() .setCustomAnimations(R.animator.slide_in_from_bottom, R.animator.slide_out_to_bottom, R.animator.slide_in_from_bottom, R.animator.slide_out_to_bottom) .show(mControlsFragment).commit(); } } protected void hidePlaybackControls() { LogHelper.d(TAG, "hidePlaybackControls"); getFragmentManager().beginTransaction().hide(mControlsFragment).commit(); } /** * Check if the MediaSession is active and in a "playback-able" state * (not NONE and not STOPPED). * * @return true if the MediaSession's state requires playback controls to be visible. */ protected boolean shouldShowControls() { MediaControllerCompat mediaController = getSupportMediaController(); if (mediaController == null || mediaController.getMetadata() == null || mediaController.getPlaybackState() == null) { return false; } switch (mediaController.getPlaybackState().getState()) { case PlaybackStateCompat.STATE_ERROR: case PlaybackStateCompat.STATE_NONE: case PlaybackStateCompat.STATE_STOPPED: return false; default: return true; } } private void connectToSession(MediaSessionCompat.Token token) throws RemoteException { MediaControllerCompat mediaController = new MediaControllerCompat(this, token); setSupportMediaController(mediaController); mediaController.registerCallback(mMediaControllerCallback); if (shouldShowControls()) { showPlaybackControls(); } else { LogHelper.d(TAG, "connectionCallback.onConnected: " + "hiding controls because metadata is null"); hidePlaybackControls(); } if (mControlsFragment != null) { mControlsFragment.onConnected(); } onMediaControllerConnected(); } // Callback that ensures that we are showing the controls private final MediaControllerCompat.Callback mMediaControllerCallback = new MediaControllerCompat.Callback() { @Override public void onPlaybackStateChanged(@NonNull PlaybackStateCompat state) { if (shouldShowControls()) { showPlaybackControls(); } else { LogHelper.d(TAG, "mediaControllerCallback.onPlaybackStateChanged: " + "hiding controls because state is ", state.getState()); hidePlaybackControls(); } } @Override public void onMetadataChanged(MediaMetadataCompat metadata) { if (shouldShowControls()) { showPlaybackControls(); } else { LogHelper.d(TAG, "mediaControllerCallback.onMetadataChanged: " + "hiding controls because metadata is null"); hidePlaybackControls(); } } }; private final MediaBrowserCompat.ConnectionCallback mConnectionCallback = new MediaBrowserCompat.ConnectionCallback() { @Override public void onConnected() { LogHelper.d(TAG, "onConnected"); try { connectToSession(mMediaBrowser.getSessionToken()); } catch (RemoteException e) { LogHelper.e(TAG, e, "could not connect media controller"); hidePlaybackControls(); } } }; }