/* * Copyright (C) 2011 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.voicemail; import android.app.Activity; import android.content.Context; import android.content.ContentResolver; import android.content.Intent; import android.database.ContentObserver; import android.database.Cursor; import android.media.AudioManager; import android.media.AudioManager.OnAudioFocusChangeListener; import android.media.MediaPlayer; import android.net.Uri; import android.os.AsyncTask; import android.os.Bundle; import android.os.Handler; import android.os.PowerManager; import android.provider.VoicemailContract; import android.util.Log; import android.view.View; import android.widget.SeekBar; import com.android.dialer.R; import com.android.dialer.util.AsyncTaskExecutor; import com.android.dialer.util.AsyncTaskExecutors; import com.android.common.io.MoreCloseables; import com.google.common.annotations.VisibleForTesting; import com.google.common.base.Preconditions; import java.io.IOException; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.RejectedExecutionException; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.atomic.AtomicBoolean; import java.util.concurrent.atomic.AtomicInteger; import javax.annotation.concurrent.NotThreadSafe; import javax.annotation.concurrent.ThreadSafe; /** * Contains the controlling logic for a voicemail playback UI. *
* This controls a single {@link com.android.dialer.voicemail.VoicemailPlaybackLayout}. A single * instance can be reused for different such layouts, using {@link #setVoicemailPlaybackView}. *
* This class is not thread safe. The thread policy for this class is thread-confinement, all calls * into this class from outside must be done from the main UI thread. */ @NotThreadSafe @VisibleForTesting public class VoicemailPlaybackPresenter implements OnAudioFocusChangeListener, MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener { private static final String TAG = VoicemailPlaybackPresenter.class.getSimpleName(); /** Contract describing the behaviour we need from the ui we are controlling. */ public interface PlaybackView { int getDesiredClipPosition(); void disableUiElements(); void enableUiElements(); void onPlaybackError(Exception e); void onPlaybackStarted(int duration, ScheduledExecutorService executorService); void onPlaybackStopped(); void onSpeakerphoneOn(boolean on); void setClipPosition(int clipPositionInMillis, int clipLengthInMillis); void setFetchContentTimeout(); void setIsBuffering(); void setIsFetchingContent(); void setPresenter(VoicemailPlaybackPresenter presenter); } /** The enumeration of {@link AsyncTask} objects we use in this class. */ public enum Tasks { CHECK_FOR_CONTENT, CHECK_CONTENT_AFTER_CHANGE, } private static final String[] HAS_CONTENT_PROJECTION = new String[] { VoicemailContract.Voicemails.HAS_CONTENT, }; public static final int PLAYBACK_STREAM = AudioManager.STREAM_VOICE_CALL; private static final int NUMBER_OF_THREADS_IN_POOL = 2; // Time to wait for content to be fetched before timing out. private static final long FETCH_CONTENT_TIMEOUT_MS = 20000; private static final String VOICEMAIL_URI_KEY = VoicemailPlaybackPresenter.class.getName() + ".VOICEMAIL_URI"; private static final String IS_PREPARED_KEY = VoicemailPlaybackPresenter.class.getName() + ".IS_PREPARED"; // If present in the saved instance bundle, we should not resume playback on create. private static final String IS_PLAYING_STATE_KEY = VoicemailPlaybackPresenter.class.getName() + ".IS_PLAYING_STATE_KEY"; // If present in the saved instance bundle, indicates where to set the playback slider. private static final String CLIP_POSITION_KEY = VoicemailPlaybackPresenter.class.getName() + ".CLIP_POSITION_KEY"; /** * The most recently cached duration. We cache this since we don't want to keep requesting it * from the player, as this can easily lead to throwing {@link IllegalStateException} (any time * the player is released, it's illegal to ask for the duration). */ private final AtomicInteger mDuration = new AtomicInteger(0); private Activity mActivity; private Context mContext; private PlaybackView mView; private static MediaPlayer mMediaPlayer; private Uri mVoicemailUri; private int mPosition; private boolean mIsPlaying; // MediaPlayer crashes on some method calls if not prepared but does not have a method which // exposes its prepared state. Store this locally, so we can check and prevent crashes. private boolean mIsPrepared; private boolean mShouldResumePlaybackAfterSeeking; // Used to run async tasks that need to interact with the UI. private final AsyncTaskExecutor mAsyncTaskExecutor; private static ScheduledExecutorService mScheduledExecutorService; /** * Used to handle the result of a successful or time-out fetch result. *
* This variable is thread-contained, accessed only on the ui thread. */ private FetchResultHandler mFetchResultHandler; private Handler mHandler = new Handler(); private PowerManager.WakeLock mProximityWakeLock; private AudioManager mAudioManager; public VoicemailPlaybackPresenter(Activity activity, Bundle savedInstanceState) { mActivity = activity; mContext = activity; mAsyncTaskExecutor = AsyncTaskExecutors.createAsyncTaskExecutor(); mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE); mActivity.setVolumeControlStream(VoicemailPlaybackPresenter.PLAYBACK_STREAM); if (savedInstanceState != null) { // Restores playback state when activity is recreated, such as after rotation. mVoicemailUri = (Uri) savedInstanceState.getParcelable(VOICEMAIL_URI_KEY); mIsPrepared = savedInstanceState.getBoolean(IS_PREPARED_KEY); mPosition = savedInstanceState.getInt(CLIP_POSITION_KEY, 0); mIsPlaying = savedInstanceState.getBoolean(IS_PLAYING_STATE_KEY, false); } PowerManager powerManager = (PowerManager) mContext.getSystemService(Context.POWER_SERVICE); if (powerManager.isWakeLockLevelSupported(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK)) { mProximityWakeLock = powerManager.newWakeLock( PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, TAG); } // mMediaPlayer is static to enable seamless playback during rotation. If we do not create // a new MediaPlayer, we still need to update listeners to the current Presenter instance. if (mMediaPlayer == null) { mMediaPlayer = new MediaPlayer(); mIsPrepared = false; } mMediaPlayer.setOnPreparedListener(this); mMediaPlayer.setOnErrorListener(this); mMediaPlayer.setOnCompletionListener(this); } public void reset() { pausePlayback(); mView = null; mVoicemailUri = null; mIsPrepared = false; mIsPlaying = false; mPosition = 0; mDuration.set(0); } /** * Specify the view which this presenter controls and the voicemail for playback. */ public void setPlaybackView( PlaybackView view, Uri voicemailUri, boolean startPlayingImmediately) { mView = view; mView.setPresenter(this); if (mVoicemailUri != null && mVoicemailUri.equals(voicemailUri)) { // Handles rotation case where playback view is set for the same voicemail. if (mIsPrepared) { onPrepared(mMediaPlayer); } else { checkForContent(); } mView.onSpeakerphoneOn(isSpeakerphoneOn()); } else { mVoicemailUri = voicemailUri; mPosition = 0; mDuration.set(0); mIsPlaying = startPlayingImmediately; // Default to earpiece. mView.onSpeakerphoneOn(false); checkForContent(); } } public void onPause(boolean isFinishing) { // Do not pause for orientation changes. if (mIsPrepared && mMediaPlayer.isPlaying() && isFinishing) { pausePlayback(); } disableProximitySensor(false /* waitForFarState */); } public void onDestroy(boolean isFinishing) { // Do not release for orientation changes. if (mIsPrepared && isFinishing) { mMediaPlayer.release(); mIsPrepared = false; } if (mScheduledExecutorService != null) { mScheduledExecutorService.shutdown(); mScheduledExecutorService = null; } if (mFetchResultHandler != null) { mFetchResultHandler.destroy(); mFetchResultHandler = null; } disableProximitySensor(false /* waitForFarState */); } public void onSaveInstanceState(Bundle outState) { if (mView != null) { outState.putParcelable(VOICEMAIL_URI_KEY, mVoicemailUri); outState.putBoolean(IS_PREPARED_KEY, mIsPrepared); outState.putInt(CLIP_POSITION_KEY, mView.getDesiredClipPosition()); outState.putBoolean(IS_PLAYING_STATE_KEY, mIsPlaying); } } /** * Checks to see if we have content available for this voicemail. *
* This method will be called once, after the fragment has been created, before we know if the * voicemail we've been asked to play has any content available. *
* Notify the user that we are fetching the content, then check to see if the content field in
* the DB is set. If set, we proceed to {@link #prepareToPlayContent()} method. If not set, make
* a request to fetch the content asynchronously via {@link #requestContent()}.
*/
private void checkForContent() {
mView.setIsFetchingContent();
mAsyncTaskExecutor.submit(Tasks.CHECK_FOR_CONTENT, new AsyncTask
* This method must be called on the ui thread.
*
* This method will be called when we realise that we don't have content for this voicemail. It
* will trigger a broadcast to request that the content be downloaded. It will add a listener to
* the content resolver so that it will be notified when the has_content field changes. It will
* also set a timer. If the has_content field changes to true within the allowed time, we will
* proceed to {@link #prepareToPlayContent()}. If the has_content field does not
* become true within the allowed time, we will update the ui to reflect the fact that content
* was not available.
*/
private void requestContent() {
if (mFetchResultHandler != null) {
mFetchResultHandler.destroy();
}
mFetchResultHandler = new FetchResultHandler(new Handler());
mFetchResultHandler.registerContentObserver(mVoicemailUri);
// Send voicemail fetch request.
Intent intent = new Intent(VoicemailContract.ACTION_FETCH_VOICEMAIL, mVoicemailUri);
mContext.sendBroadcast(intent);
}
@ThreadSafe
private class FetchResultHandler extends ContentObserver implements Runnable {
private AtomicBoolean mIsWaitingForResult = new AtomicBoolean(true);
private final Handler mFetchResultHandler;
public FetchResultHandler(Handler handler) {
super(handler);
mFetchResultHandler = handler;
}
public void registerContentObserver(Uri voicemailUri) {
if (mIsWaitingForResult.get()) {
mContext.getContentResolver().registerContentObserver(
voicemailUri, false, this);
mFetchResultHandler.postDelayed(this, FETCH_CONTENT_TIMEOUT_MS);
}
}
/**
* Stop waiting for content and notify UI if {@link FETCH_CONTENT_TIMEOUT_MS} has elapsed.
*/
@Override
public void run() {
if (mIsWaitingForResult.getAndSet(false)) {
mContext.getContentResolver().unregisterContentObserver(this);
if (mView != null) {
mView.setFetchContentTimeout();
}
}
}
public void destroy() {
if (mIsWaitingForResult.getAndSet(false)) {
mContext.getContentResolver().unregisterContentObserver(this);
mFetchResultHandler.removeCallbacks(this);
}
}
@Override
public void onChange(boolean selfChange) {
mAsyncTaskExecutor.submit(Tasks.CHECK_CONTENT_AFTER_CHANGE,
new AsyncTask
* This method will be called once we know that our voicemail has content (according to the
* content provider). this method asynchronously tries to prepare the data source through the
* media player. If preparation is successful, the media player will {@link #onPrepared()},
* and it will call {@link #onError()} otherwise.
*/
private void prepareToPlayContent() {
if (mView == null) {
return;
}
mIsPrepared = false;
mView.setIsBuffering();
try {
mMediaPlayer.reset();
mMediaPlayer.setDataSource(mContext, mVoicemailUri);
mMediaPlayer.setAudioStreamType(PLAYBACK_STREAM);
mMediaPlayer.prepareAsync();
} catch (IOException e) {
handleError(e);
}
}
/**
* Once the media player is prepared, enables the UI and adopts the appropriate playback state.
*/
@Override
public void onPrepared(MediaPlayer mp) {
if (mView == null) {
return;
}
mIsPrepared = true;
mDuration.set(mMediaPlayer.getDuration());
mView.enableUiElements();
mView.setClipPosition(mPosition, mDuration.get());
if (mIsPlaying) {
resumePlayback();
} else {
pausePlayback();
}
}
/**
* Invoked if preparing the media player fails, for example, if file is missing or the voicemail
* is an unknown file format that can't be played.
*/
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
handleError(new IllegalStateException("MediaPlayer error listener invoked: " + extra));
return true;
}
private void handleError(Exception e) {
if (mIsPrepared) {
mMediaPlayer.release();
mIsPrepared = false;
}
mView.onPlaybackError(e);
mPosition = 0;
mIsPlaying = false;
}
/**
* After done playing the voicemail clip, reset the clip position to the start.
*/
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
pausePlayback();
// Reset the seekbar position to the beginning.
mPosition = 0;
mView.setClipPosition(0, mDuration.get());
}
@Override
public void onAudioFocusChange(int focusChange) {
if (!mIsPrepared) {
return;
}
boolean lostFocus = focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT ||
focusChange == AudioManager.AUDIOFOCUS_LOSS;
if (mMediaPlayer.isPlaying() && lostFocus) {
pausePlayback();
} else if (!mMediaPlayer.isPlaying() && focusChange == AudioManager.AUDIOFOCUS_GAIN) {
resumePlayback();
}
}
/**
* Resumes voicemail playback at the clip position stored by the presenter. Null-op if already
* playing.
*/
public void resumePlayback() {
if (!mIsPrepared) {
return;
}
mIsPlaying = true;
if (!mMediaPlayer.isPlaying()) {
// Clamp the start position between 0 and the duration.
mPosition = Math.max(0, Math.min(mPosition, mDuration.get()));
mMediaPlayer.seekTo(mPosition);
try {
// Grab audio focus here
int result = mAudioManager.requestAudioFocus(
VoicemailPlaybackPresenter.this,
PLAYBACK_STREAM,
AudioManager.AUDIOFOCUS_GAIN_TRANSIENT);
if (result != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
throw new RejectedExecutionException("Could not capture audio focus.");
}
// Can throw RejectedExecutionException
mMediaPlayer.start();
} catch (RejectedExecutionException e) {
handleError(e);
}
}
enableProximitySensor();
mView.onPlaybackStarted(mDuration.get(), getScheduledExecutorServiceInstance());
}
/**
* Pauses voicemail playback at the current position. Null-op if already paused.
*/
public void pausePlayback() {
if (!mIsPrepared) {
return;
}
mPosition = mMediaPlayer.getCurrentPosition();
mIsPlaying = false;
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
}
mAudioManager.abandonAudioFocus(this);
mView.onPlaybackStopped();
// Always disable the proximity sensor on stop.
disableProximitySensor(true /* waitForFarState */);
}
/**
* Pauses playback when the user starts seeking the position, and notes whether the voicemail is
* playing to know whether to resume playback once the user selects a new position.
*/
public void pausePlaybackForSeeking() {
mShouldResumePlaybackAfterSeeking = mMediaPlayer.isPlaying();
pausePlayback();
}
public void resumePlaybackAfterSeeking(int desiredPosition) {
mPosition = desiredPosition;
if (mShouldResumePlaybackAfterSeeking) {
mShouldResumePlaybackAfterSeeking = false;
resumePlayback();
}
}
private void enableProximitySensor() {
if (mProximityWakeLock == null || isSpeakerphoneOn() || !mIsPrepared
|| !mMediaPlayer.isPlaying()) {
return;
}
if (!mProximityWakeLock.isHeld()) {
Log.i(TAG, "Acquiring proximity wake lock");
mProximityWakeLock.acquire();
} else {
Log.i(TAG, "Proximity wake lock already acquired");
}
}
private void disableProximitySensor(boolean waitForFarState) {
if (mProximityWakeLock == null) {
return;
}
if (mProximityWakeLock.isHeld()) {
Log.i(TAG, "Releasing proximity wake lock");
int flags = waitForFarState ? PowerManager.RELEASE_FLAG_WAIT_FOR_NO_PROXIMITY : 0;
mProximityWakeLock.release(flags);
} else {
Log.i(TAG, "Proximity wake lock already released");
}
}
public void setSpeakerphoneOn(boolean on) {
mAudioManager.setSpeakerphoneOn(on);
if (on) {
disableProximitySensor(false /* waitForFarState */);
} else {
enableProximitySensor();
}
}
public boolean isSpeakerphoneOn() {
return mAudioManager.isSpeakerphoneOn();
}
public Uri getVoicemailUri() {
return mVoicemailUri;
}
public int getMediaPlayerPosition() {
return mIsPrepared ? mMediaPlayer.getCurrentPosition() : 0;
}
private static synchronized ScheduledExecutorService getScheduledExecutorServiceInstance() {
if (mScheduledExecutorService == null) {
mScheduledExecutorService = Executors.newScheduledThreadPool(NUMBER_OF_THREADS_IN_POOL);
}
return mScheduledExecutorService;
}
@VisibleForTesting
public boolean isPlaying() {
return mIsPlaying;
}
}