在 Oreo 中销毁服务时防止通知被取消
Keeping notification from dismissing when service is destroyed in Oreo
好的。我有一个关于在 Android Oreo 中保留媒体播放器服务的问题。基于这里的讨论:
Android Oreo: Keep started background service alive without setting it foreground (but with a notification)?
似乎在 Android Oreo 中处理媒体播放器服务的正确方法是在媒体播放器暂停时存储状态信息,因此如果它被破坏,按下播放将创建一个新的媒体播放器并从哪里开始它停止了。
我的问题是如何创建一个在启动它的服务被销毁时不会被销毁的通知。我不是 运行 任何关闭通知的代码,但当服务被销毁时它仍然被自动关闭。正如您在我的代码中看到的那样,我可以重建 onDestroy 通知,但我不喜欢这种方式,因为用户可以看到它被关闭并再次重建。
这是我的通知代码:
private void buildNotification() {
Cat.d("building notification");
final MediaPlayerService context = this;
RequestBuilder<Bitmap> requestBuilder = Glide.with(this).asBitmap()
.load(R.mipmap.ic_launcher);
NotificationCompat.Action action;
if (mediaPlayer != null && mediaPlayer.isPlaying())
action = generateAction(R.drawable.ic_pause, "Pause");
else
action = generateAction(R.drawable.ic_play_arrow, "Play");
int[] actionsInCompact;
builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
.setSmallIcon(R.drawable.ic_navbooks_icon_black)
//.setOnlyAlertOnce(true)
.setContentTitle(book.getTitle())
.setContentText(book.getAuthor())
.setAutoCancel(false)
.setContentIntent(PendingIntentHelper.getOpenMainActivityIntent(context, book.getId()))
.setDeleteIntent(PendingIntentHelper.getStopServiceIntent(context));
if (SettingsUtil.GetNotificationSkip(context)) {
builder.addAction(R.drawable.ic_skip_backward, "Skip Previous",
PendingIntentHelper.getSkipBackwardIntent(context))
.addAction(R.drawable.ic_backward, "Rewind",
PendingIntentHelper.getSeekBackwardIntent(context))
.addAction(action)
.addAction(R.drawable.ic_forward, "Fast Forward",
PendingIntentHelper.getSeekForwardIntent(context))
.addAction(R.drawable.ic_skip_forward, "Skip Next",
PendingIntentHelper.getSkipForwardIntent(context));
actionsInCompact = new int[]{0, 1, 2, 3, 4};
} else {
builder.addAction(R.drawable.ic_backward, "Rewind",
PendingIntentHelper.getSeekBackwardIntent(context))
.addAction(action)
.addAction(R.drawable.ic_forward, "Fast Forward",
PendingIntentHelper.getSeekForwardIntent(context));
actionsInCompact = new int[]{0, 1, 2};
}
builder.setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
.setMediaSession(mediaSession.getSessionToken())
.setShowActionsInCompactView(actionsInCompact));
// Load a cover image if there isn't one loaded yet or the cover has changed
if(cover == null || !book.getCover().equals(lastCover)) {
lastCover = book.getCover();
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
Glide.with(this)
.asBitmap()
.error(requestBuilder)
.load(book.getCover())
.into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap largeIcon, Transition transition) {
Cat.d("Finished loading");
cover = largeIcon;
// initBuilder
builder.setLargeIcon(largeIcon);
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, largeIcon)
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
startNotification();
}
});
} else {
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, cover)
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
if(cover != null)
builder.setLargeIcon(cover);
}
startNotification();
}
private NotificationCompat.Action generateAction(int icon, String title) {
return new NotificationCompat.Action.Builder( icon, title, PendingIntentHelper.getPlayPauseIntent(this)).build();
}
private void startNotification() {
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setActions(MEDIA_SESSION_ACTIONS)
.setState(mediaPlayer.isPlaying() ? PlaybackStateCompat.STATE_PLAYING :
PlaybackStateCompat.STATE_PAUSED, book.getLastPosition(), 1)
.build());
if(mediaPlayer.isPlaying())
startForeground(NOTIFICATION_ID, builder.build());
else
{
NotificationManager notificationManager =
(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
if(notificationManager != null) {
notificationManager.notify(NOTIFICATION_ID, builder.build());
}
stopForeground(false);
}
}
这是服务被销毁时发生的情况:
@Override
public void onDestroy() {
//super.onDestroy();
handleDestroy();
}
private void handleDestroy() {
if(book != null)
sendProgressUpdate();
else
book = new BookDBHelper(this).getBook(SettingsUtil.GetLastPlayedBook(this));
if(mediaPlayer != null) {
book.setLastPosition(this, getPosition());
SyncHelper.SendProgressUpdate(this, book);
}
if(mediaSession != null)
mediaSession.release();
if(noisyRegistered) {
unregisterReceiver(becomingNoisyReceiver);
unregisterReceiver(shakeReceiver);
}
buildNotification();
}
好的。我发现 stopForeground 函数有一个可选的标志参数而不是布尔值。可以给它一个标志 STOP_FOREGROUND_DETACH ,即使在调用 stopForeground 之后,它也是从服务中分离通知所必需的,这样当服务被销毁时,通知就不会被取消,并且不必重新通知建成。这是我用于启动通知的更新代码:
private fun updateNotification(preparing: Boolean = false) {
if(getPlaying()) {
startService(Intent(applicationContext, this@MediaPlayerService.javaClass))
startForeground(NOTIFICATION_ID, getNotification())
}else {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
stopForeground(Service.STOP_FOREGROUND_DETACH)
else
stopForeground(false)
notificationManager.notify(NOTIFICATION_ID, getNotification())
}
}
好的。我有一个关于在 Android Oreo 中保留媒体播放器服务的问题。基于这里的讨论:
Android Oreo: Keep started background service alive without setting it foreground (but with a notification)?
似乎在 Android Oreo 中处理媒体播放器服务的正确方法是在媒体播放器暂停时存储状态信息,因此如果它被破坏,按下播放将创建一个新的媒体播放器并从哪里开始它停止了。
我的问题是如何创建一个在启动它的服务被销毁时不会被销毁的通知。我不是 运行 任何关闭通知的代码,但当服务被销毁时它仍然被自动关闭。正如您在我的代码中看到的那样,我可以重建 onDestroy 通知,但我不喜欢这种方式,因为用户可以看到它被关闭并再次重建。
这是我的通知代码:
private void buildNotification() {
Cat.d("building notification");
final MediaPlayerService context = this;
RequestBuilder<Bitmap> requestBuilder = Glide.with(this).asBitmap()
.load(R.mipmap.ic_launcher);
NotificationCompat.Action action;
if (mediaPlayer != null && mediaPlayer.isPlaying())
action = generateAction(R.drawable.ic_pause, "Pause");
else
action = generateAction(R.drawable.ic_play_arrow, "Play");
int[] actionsInCompact;
builder = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
.setSmallIcon(R.drawable.ic_navbooks_icon_black)
//.setOnlyAlertOnce(true)
.setContentTitle(book.getTitle())
.setContentText(book.getAuthor())
.setAutoCancel(false)
.setContentIntent(PendingIntentHelper.getOpenMainActivityIntent(context, book.getId()))
.setDeleteIntent(PendingIntentHelper.getStopServiceIntent(context));
if (SettingsUtil.GetNotificationSkip(context)) {
builder.addAction(R.drawable.ic_skip_backward, "Skip Previous",
PendingIntentHelper.getSkipBackwardIntent(context))
.addAction(R.drawable.ic_backward, "Rewind",
PendingIntentHelper.getSeekBackwardIntent(context))
.addAction(action)
.addAction(R.drawable.ic_forward, "Fast Forward",
PendingIntentHelper.getSeekForwardIntent(context))
.addAction(R.drawable.ic_skip_forward, "Skip Next",
PendingIntentHelper.getSkipForwardIntent(context));
actionsInCompact = new int[]{0, 1, 2, 3, 4};
} else {
builder.addAction(R.drawable.ic_backward, "Rewind",
PendingIntentHelper.getSeekBackwardIntent(context))
.addAction(action)
.addAction(R.drawable.ic_forward, "Fast Forward",
PendingIntentHelper.getSeekForwardIntent(context));
actionsInCompact = new int[]{0, 1, 2};
}
builder.setStyle(new android.support.v4.media.app.NotificationCompat.MediaStyle()
.setMediaSession(mediaSession.getSessionToken())
.setShowActionsInCompactView(actionsInCompact));
// Load a cover image if there isn't one loaded yet or the cover has changed
if(cover == null || !book.getCover().equals(lastCover)) {
lastCover = book.getCover();
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
Glide.with(this)
.asBitmap()
.error(requestBuilder)
.load(book.getCover())
.into(new SimpleTarget<Bitmap>() {
@Override
public void onResourceReady(Bitmap largeIcon, Transition transition) {
Cat.d("Finished loading");
cover = largeIcon;
// initBuilder
builder.setLargeIcon(largeIcon);
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, largeIcon)
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
startNotification();
}
});
} else {
mediaSession.setMetadata(new MediaMetadataCompat.Builder()
.putBitmap(MediaMetadataCompat.METADATA_KEY_ALBUM_ART, cover)
.putString(MediaMetadataCompat.METADATA_KEY_ARTIST, book.getTitle())
.putString(MediaMetadataCompat.METADATA_KEY_TITLE, book.getAuthor())
.build());
if(cover != null)
builder.setLargeIcon(cover);
}
startNotification();
}
private NotificationCompat.Action generateAction(int icon, String title) {
return new NotificationCompat.Action.Builder( icon, title, PendingIntentHelper.getPlayPauseIntent(this)).build();
}
private void startNotification() {
mediaSession.setPlaybackState(new PlaybackStateCompat.Builder()
.setActions(MEDIA_SESSION_ACTIONS)
.setState(mediaPlayer.isPlaying() ? PlaybackStateCompat.STATE_PLAYING :
PlaybackStateCompat.STATE_PAUSED, book.getLastPosition(), 1)
.build());
if(mediaPlayer.isPlaying())
startForeground(NOTIFICATION_ID, builder.build());
else
{
NotificationManager notificationManager =
(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
if(notificationManager != null) {
notificationManager.notify(NOTIFICATION_ID, builder.build());
}
stopForeground(false);
}
}
这是服务被销毁时发生的情况:
@Override
public void onDestroy() {
//super.onDestroy();
handleDestroy();
}
private void handleDestroy() {
if(book != null)
sendProgressUpdate();
else
book = new BookDBHelper(this).getBook(SettingsUtil.GetLastPlayedBook(this));
if(mediaPlayer != null) {
book.setLastPosition(this, getPosition());
SyncHelper.SendProgressUpdate(this, book);
}
if(mediaSession != null)
mediaSession.release();
if(noisyRegistered) {
unregisterReceiver(becomingNoisyReceiver);
unregisterReceiver(shakeReceiver);
}
buildNotification();
}
好的。我发现 stopForeground 函数有一个可选的标志参数而不是布尔值。可以给它一个标志 STOP_FOREGROUND_DETACH ,即使在调用 stopForeground 之后,它也是从服务中分离通知所必需的,这样当服务被销毁时,通知就不会被取消,并且不必重新通知建成。这是我用于启动通知的更新代码:
private fun updateNotification(preparing: Boolean = false) {
if(getPlaying()) {
startService(Intent(applicationContext, this@MediaPlayerService.javaClass))
startForeground(NOTIFICATION_ID, getNotification())
}else {
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.N)
stopForeground(Service.STOP_FOREGROUND_DETACH)
else
stopForeground(false)
notificationManager.notify(NOTIFICATION_ID, getNotification())
}
}