我正在使用音乐应用程序，因此我的通知使用MediaStyle并显示与前台服务链接。
我的服务：
public class MusicService extends Service
implements AudioManager.OnAudioFocusChangeListener, MediaPlayer.OnPreparedListener, MediaPlayer.OnCompletionListener, MediaPlayer.OnErrorListener{
//region Variables
...
//endregion
//region Service
@Override
public void onCreate() {
super.onCreate();
InitMediaPlayer();
mAudioManager = (AudioManager) getSystemService(AUDIO_SERVICE);
mPreferences = PreferenceManager.getDefaultSharedPreferences(getApplicationContext());
iCurrentSongIndex = 0;
iSeekTo = -1;
bPlayingFromQueue = false;
bStarted = bPreparing = bRestartAfterLoss = bControlReceiverRegistered = false;
mPlayMode = PlayMode.PASS;
mSongQueue = new ArrayList<>();
nManager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
int iRequestResult = mAudioManager.requestAudioFocus(this, AudioManager.STREAM_MUSIC, AudioManager.AUDIOFOCUS_GAIN);
if (iRequestResult != AudioManager.AUDIOFOCUS_REQUEST_GRANTED) {
Toast.makeText(getApplicationContext(), "Couldn't gain the Permission to play music!", Toast.LENGTH_LONG).show();
stopForeground(true);
stopSelf();
return;
}
mControlReceiver = new MediaControlReceiver();
IntentFilter infNotification = new IntentFilter();
infNotification.addAction(MediaControlReceiver.NOTIFY_PLAYPAUSE);
infNotification.addAction(MediaControlReceiver.NOTIFY_PREVIOUS);
infNotification.addAction(MediaControlReceiver.NOTIFY_NEXT);
infNotification.addAction(MediaControlReceiver.NOTIFY_CANCEL);
infNotification.addAction(Intent.ACTION_HEADSET_PLUG);
if (!bControlReceiverRegistered) {
registerReceiver(mControlReceiver, infNotification);
bControlReceiverRegistered = true;
}
mRemoteControlComponent = new ComponentName(this, RemoteControlReceiver.class);
mAudioManager.registerMediaButtonEventReceiver(mRemoteControlComponent);
getTheme().applyStyle(RuntimeInfo.getThemeID(), true);
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
return START_NOT_STICKY;
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return new MusicBinder();
}
@Override
public boolean onUnbind(Intent intent) {
return super.onUnbind(intent);
}
@Override
public void onDestroy() {
super.onDestroy();
if (mMediaPlayer != null) {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.stop();
}
mMediaPlayer.reset();
mMediaPlayer.release();
mMediaPlayer = null;
}
if (bControlReceiverRegistered) {
unregisterReceiver(mControlReceiver);
mControlReceiver = null;
}
mAudioManager.unregisterMediaButtonEventReceiver(mRemoteControlComponent);
mAudioManager = null;
SharedPreferences.Editor mEditor = mPreferences.edit();
mEditor.putString(Constants.Preferences.PLAYMODE, mPlayMode.toString());
mEditor.apply();
if (SleepTimer.isTimerRunning()) {
SleepTimer.cancelTimer();
}
}
@Override
public void onAudioFocusChange(int focusChange) {
if (isActive()) {
switch (focusChange) {
case AudioManager.AUDIOFOCUS_GAIN:
if (bRestartAfterLoss) {
mMediaPlayer.setVolume(1.0f, 1.0f);
if (!isPlaying() && !isPreparing()) {
play();
}
}
break;
case AudioManager.AUDIOFOCUS_LOSS:
bRestartAfterLoss = false;
if (isPlaying()) {
pause();
}
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT:
bRestartAfterLoss = true;
if (isPlaying()) {
pause();
}
break;
case AudioManager.AUDIOFOCUS_LOSS_TRANSIENT_CAN_DUCK:
bRestartAfterLoss = true;
int duckFactor = mPreferences.getInt(getResources().getString(R.string.keyDuckVolume), 10);
float percent = (float) duckFactor / 100f;
mMediaPlayer.setVolume(percent, percent);
break;
}
}
}
//endregion
//region Control-Methods
public void play() {
if (!bStarted) {
playSong(iCurrentSongIndex);
}
else {
mMediaPlayer.start();
startForeground(NOTIFICATION_ID, Build_Notification());
if (mCallback != null) {
mCallback.onPlayPause(true);
}
}
}
public void pause() {
mMediaPlayer.pause();
nManager.notify(NOTIFICATION_ID, Build_Notification());
if (mCallback != null) {
mCallback.onPlayPause(false);
}
}
//endregion
//region MediaPlayer
@Override
public void onCompletion(MediaPlayer mp) {
if (mSongQueue.size() > 0) {
playSong(PLAY_QUEUE);
}
else {
switch (mPlayMode) {
default:
case PASS:
if (iCurrentSongIndex++ < sSongs.length) {
playSong(iCurrentSongIndex);
}
else {
mNotification = null;
if (mCallback != null) {
mCallback.onCompleted(getCurrentSong());
}
}
break;
case REPEAT_SINGLE:
playSong(iCurrentSongIndex);
break;
case REPEAT_ALL:
next();
break;
case SHUFFLE:
iCurrentSongIndex = new Random().nextInt(sSongs.length);
playSong(iCurrentSongIndex);
break;
}
}
}
@Override
public boolean onError(MediaPlayer mp, int what, int extra) {
mp.reset();
return false;
}
@Override
public void onPrepared(MediaPlayer mp) {
if (iSeekTo != -1) {
mp.seekTo(iSeekTo);
iSeekTo = -1;
}
mp.start();
SharedPreferences.Editor editor = mPreferences.edit();
editor.putLong(Constants.Preferences.LAST_SONG, getCurrentSong().getID());
editor.apply();
startForeground(NOTIFICATION_ID, Build_Notification());
bPreparing = false;
if (!bStarted) {
bStarted = true;
}
}
//endregion
//region Methods
private void InitMediaPlayer() {
mMediaPlayer = new MediaPlayer();
mMediaPlayer.setWakeMode(getApplicationContext(), PowerManager.PARTIAL_WAKE_LOCK);
mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);
mMediaPlayer.setOnPreparedListener(this);
mMediaPlayer.setOnCompletionListener(this);
mMediaPlayer.setOnErrorListener(this);
}
private Notification Build_Notification() {
NotificationCompat.Builder nBuilder = new NotificationCompat.Builder(this);
nBuilder.setShowWhen(false);
TypedValue typedValue = new TypedValue();
getTheme().resolveAttribute(R.attr.colorPrimary, typedValue, true);
int iPrimaryColor = typedValue.data;
nBuilder.setColor(iPrimaryColor);
Intent notIntent = new Intent(getApplicationContext(), MainActivity.class);
PendingIntent notOpenOnClick = PendingIntent.getActivity(getApplicationContext(), 0, notIntent, PendingIntent.FLAG_UPDATE_CURRENT);
MediaSessionCompat mMediaSession = new MediaSessionCompat(getApplicationContext(), getPackageName());
MediaMetadataCompat.Builder mMetaDataBuilder = new MediaMetadataCompat.Builder();
mMetaDataBuilder.putString(MediaMetadataCompat.METADATA_KEY_TITLE, getCurrentSong().getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_ALBUM, getCurrentSong().getAlbum())
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, getCurrentSong().getArtist());
if (isPreparing() || isPlaying()) {
mMediaSession.setActive(true);
}
else {
mMediaSession.setActive(false);
}
mMediaSession.setMetadata(mMetaDataBuilder.build());
mMediaSession.setFlags(MediaSessionCompat.FLAG_HANDLES_TRANSPORT_CONTROLS);
nBuilder.setSmallIcon(R.drawable.not_icon)
.setContentTitle(getCurrentSong().getTitle())
.setContentText(getCurrentSong().getAlbum() + " - " + getCurrentSong().getArtist())
.setLargeIcon(new ArtworkProvider(this).getAlbumArtwork(getCurrentSong().getAlbumID(), 100, 100))
.setContentIntent(notOpenOnClick);
Intent previous = new Intent(MediaControlReceiver.NOTIFY_PREVIOUS);
Intent next = new Intent(MediaControlReceiver.NOTIFY_NEXT);
Intent playpause = new Intent(MediaControlReceiver.NOTIFY_PLAYPAUSE);
Intent cancel = new Intent(MediaControlReceiver.NOTIFY_CANCEL);
PendingIntent pPrevious = PendingIntent.getBroadcast(getApplicationContext(), 0, previous, PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent pPlayPause = PendingIntent.getBroadcast(getApplicationContext(), 0, playpause, PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent pNext = PendingIntent.getBroadcast(getApplicationContext(), 0, next, PendingIntent.FLAG_UPDATE_CURRENT);
PendingIntent pCancel = PendingIntent.getBroadcast(getApplicationContext(), 0, cancel, PendingIntent.FLAG_UPDATE_CURRENT);
nBuilder.addAction(R.drawable.ic_previous_48dp, MediaControlReceiver.NOTIFY_PREVIOUS, pPrevious);
if (isPreparing() || isPlaying()) {
nBuilder.addAction(R.drawable.ic_pause_48dp, MediaControlReceiver.NOTIFY_PLAYPAUSE, pPlayPause);
}
else {
nBuilder.addAction(R.drawable.ic_play_48dp, MediaControlReceiver.NOTIFY_PLAYPAUSE, pPlayPause);
}
nBuilder.addAction(R.drawable.ic_next_48dp, MediaControlReceiver.NOTIFY_NEXT, pNext);
nBuilder.setStyle(new NotificationCompat.MediaStyle()
.setMediaSession(mMediaSession.getSessionToken())
.setShowActionsInCompactView(0, 1, 2)
.setShowCancelButton(true)
.setCancelButtonIntent(pCancel));
mNotification = nBuilder.build();
return mNotification;
}
//endregion
public enum PlayMode {
PASS, REPEAT_SINGLE, REPEAT_ALL, SHUFFLE
}
public class MusicBinder extends Binder {
public MusicService getService() {
return MusicService.this;
}
}
}
我没有将Notification Property“OnGoing”设置为true，我已经尝试将其设置为false，但这不会改变任何内容！
答案 0 :(得分：0)
我犯了一个愚蠢的错误：
我忘了在pause（）中调用stopForeground（false）。
这是我的工作代码：
public void pause() {
mMediaPlayer.pause();
stopForeground(false);
nManager.notify(NOTIFICATION_ID, Build_Notification());
if (mCallback != null) {
mCallback.onPlayPause(false);
}
}