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|
/*
* 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 in the call log. It is closely coupled
* to assumptions about the behaviors and lifecycle of the call log, in particular in the
* {@link CallLogFragment} and {@link CallLogAdapter}.
* <p>
* This controls a single {@link com.android.dialer.voicemail.VoicemailPlaybackLayout}. A single
* instance can be reused for different such layouts, using {@link #setVoicemailPlaybackView}. This
* is to facilitate reuse across different voicemail call log entries.
* <p>
* 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();
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, Uri voicemailUri);
}
/** 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 static VoicemailPlaybackPresenter sInstance;
private Activity mActivity;
private Context mContext;
private PlaybackView mView;
private Uri mVoicemailUri;
private MediaPlayer mMediaPlayer;
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;
private int mInitialOrientation;
// Used to run async tasks that need to interact with the UI.
private AsyncTaskExecutor mAsyncTaskExecutor;
private static ScheduledExecutorService mScheduledExecutorService;
/**
* Used to handle the result of a successful or time-out fetch result.
* <p>
* 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;
/**
* Obtain singleton instance of this class. Use a single instance to provide a consistent
* listener to the AudioManager when requesting and abandoning audio focus.
*
* Otherwise, after rotation the previous listener will still be active but a new listener
* will be provided to calls to the AudioManager, which is bad. For example, abandoning
* audio focus with the new listeners results in an AUDIO_FOCUS_GAIN callback to the
* previous listener, which is the opposite of the intended behavior.
*/
public static VoicemailPlaybackPresenter getInstance(
Activity activity, Bundle savedInstanceState) {
if (sInstance == null) {
sInstance = new VoicemailPlaybackPresenter(activity);
}
sInstance.init(activity, savedInstanceState);
return sInstance;
}
/**
* Initialize variables which are activity-independent and state-independent.
*/
private VoicemailPlaybackPresenter(Activity activity) {
Context context = activity.getApplicationContext();
mAsyncTaskExecutor = AsyncTaskExecutors.createAsyncTaskExecutor();
mAudioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
PowerManager powerManager =
(PowerManager) context.getSystemService(Context.POWER_SERVICE);
if (powerManager.isWakeLockLevelSupported(PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK)) {
mProximityWakeLock = powerManager.newWakeLock(
PowerManager.PROXIMITY_SCREEN_OFF_WAKE_LOCK, TAG);
}
}
/**
* Update variables which are activity-dependent or state-dependent.
*/
private void init(Activity activity, Bundle savedInstanceState) {
mActivity = activity;
mContext = activity;
mInitialOrientation = mContext.getResources().getConfiguration().orientation;
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);
}
}
/**
* Must be invoked when the parent Activity is saving it state.
*/
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);
}
}
/**
* Specify the view which this presenter controls and the voicemail to prepare to play.
*/
public void setPlaybackView(
PlaybackView view, Uri voicemailUri, boolean startPlayingImmediately) {
mView = view;
mView.setPresenter(this, voicemailUri);
if (mMediaPlayer != null && voicemailUri.equals(mVoicemailUri)) {
// Handles case where MediaPlayer was retained after an orientation change.
onPrepared(mMediaPlayer);
mView.onSpeakerphoneOn(isSpeakerphoneOn());
} else {
if (!voicemailUri.equals(mVoicemailUri)) {
mPosition = 0;
}
mVoicemailUri = voicemailUri;
mDuration.set(0);
mIsPlaying = startPlayingImmediately;
checkForContent();
// Default to earpiece.
mView.onSpeakerphoneOn(false);
}
}
/**
* Reset the presenter for playback.
*/
public void reset() {
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
disableProximitySensor(false /* waitForFarState */);
mView = null;
mVoicemailUri = null;
mIsPrepared = false;
mIsPlaying = false;
mPosition = 0;
mDuration.set(0);
}
/**
* Must be invoked when the parent activity is paused.
*/
public void onPause() {
if (mContext != null && mIsPrepared
&& mInitialOrientation != mContext.getResources().getConfiguration().orientation) {
// If an orientation change triggers the pause, retain the MediaPlayer.
Log.d(TAG, "onPause: Orientation changed.");
return;
}
// Release the media player, otherwise there may be failures.
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
disableProximitySensor(false /* waitForFarState */);
}
/**
* Must be invoked when the parent activity is destroyed.
*/
public void onDestroy() {
// Clear references to avoid leaks from the singleton instance.
mActivity = null;
mContext = null;
if (mScheduledExecutorService != null) {
mScheduledExecutorService.shutdown();
mScheduledExecutorService = null;
}
if (mFetchResultHandler != null) {
mFetchResultHandler.destroy();
mFetchResultHandler = null;
}
}
/**
* Checks to see if we have content available for this voicemail.
* <p>
* 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.
* <p>
* 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 #prepareContent()} 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<Void, Void, Boolean>() {
@Override
public Boolean doInBackground(Void... params) {
return queryHasContent(mVoicemailUri);
}
@Override
public void onPostExecute(Boolean hasContent) {
if (hasContent) {
prepareContent();
} else {
requestContent();
}
}
});
}
private boolean queryHasContent(Uri voicemailUri) {
ContentResolver contentResolver = mContext.getContentResolver();
Cursor cursor = contentResolver.query(
voicemailUri, HAS_CONTENT_PROJECTION, null, null, null);
try {
if (cursor != null && cursor.moveToNext()) {
return cursor.getInt(cursor.getColumnIndexOrThrow(
VoicemailContract.Voicemails.HAS_CONTENT)) == 1;
}
} finally {
MoreCloseables.closeQuietly(cursor);
}
return false;
}
/**
* Makes a broadcast request to ask that a voicemail source fetch this content.
* <p>
* This method <b>must be called on the ui thread</b>.
* <p>
* 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 #prepareContent()}. 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(), 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, Uri voicemailUri) {
super(handler);
mFetchResultHandler = handler;
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 != null) {
mContext.getContentResolver().unregisterContentObserver(this);
if (mView != null) {
mView.setFetchContentTimeout();
}
}
}
public void destroy() {
if (mIsWaitingForResult.getAndSet(false) && mContext != null) {
mContext.getContentResolver().unregisterContentObserver(this);
mFetchResultHandler.removeCallbacks(this);
}
}
@Override
public void onChange(boolean selfChange) {
mAsyncTaskExecutor.submit(Tasks.CHECK_CONTENT_AFTER_CHANGE,
new AsyncTask<Void, Void, Boolean>() {
@Override
public Boolean doInBackground(Void... params) {
return queryHasContent(mVoicemailUri);
}
@Override
public void onPostExecute(Boolean hasContent) {
if (hasContent && mContext != null && mIsWaitingForResult.getAndSet(false)) {
mContext.getContentResolver().unregisterContentObserver(
FetchResultHandler.this);
prepareContent();
}
}
});
}
}
/**
* Prepares the voicemail content for playback.
* <p>
* 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 prepareContent() {
if (mView == null) {
return;
}
Log.d(TAG, "prepareContent");
// Release the previous media player, otherwise there may be failures.
if (mMediaPlayer != null) {
mMediaPlayer.release();
mMediaPlayer = null;
}
mView.setIsBuffering();
mIsPrepared = false;
try {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setOnPreparedListener(this);
mMediaPlayer.setOnErrorListener(this);
mMediaPlayer.setOnCompletionListener(this);
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;
}
Log.d(TAG, "onPrepared");
mIsPrepared = true;
mDuration.set(mMediaPlayer.getDuration());
mView.enableUiElements();
Log.d(TAG, "onPrepared: mPosition=" + mPosition);
mView.setClipPosition(mPosition, mDuration.get());
mMediaPlayer.seekTo(mPosition);
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) {
Log.d(TAG, "handleError: Could not play voicemail " + e);
if (mIsPrepared) {
mMediaPlayer.release();
mMediaPlayer = null;
mIsPrepared = false;
}
mView.onPlaybackError();
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) {
Log.d(TAG, "onAudioFocusChange: focusChange=" + focusChange);
boolean lostFocus = focusChange == AudioManager.AUDIOFOCUS_LOSS_TRANSIENT
|| focusChange == AudioManager.AUDIOFOCUS_LOSS;
if (mIsPlaying && focusChange == AudioManager.AUDIOFOCUS_LOSS) {
pausePlayback();
} else if (!mIsPlaying && 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.
int result = mAudioManager.requestAudioFocus(
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);
}
}
Log.d(TAG, "Resumed playback at " + mPosition + ".");
mView.onPlaybackStarted(mDuration.get(), getScheduledExecutorServiceInstance());
enableProximitySensor();
}
/**
* Pauses voicemail playback at the current position. Null-op if already paused.
*/
public void pausePlayback() {
if (!mIsPrepared) {
return;
}
mIsPlaying = false;
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
}
mPosition = mMediaPlayer.getCurrentPosition();
Log.d(TAG, "Paused playback at " + mPosition + ".");
mView.onPlaybackStopped();
mAudioManager.abandonAudioFocus(this);
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() {
// Disable until proximity sensor behavior in onPause is fixed: b/21932251.
/*
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 int getMediaPlayerPosition() {
return mIsPrepared && mMediaPlayer != null ? 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;
}
}
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