我创建了一个前台服务，并在其中启动了一个exoplayer实例。但是当应用程序进入后台时，服务会在一段时间后停止，从而导致玩家崩溃。我想要停止服务，只有当用户解散它(通过暂停使它不是前台服务)。
服务规范:
public class BackgroundAudioService extends Service {
static SimpleExoPlayer player;
Context context;
@Override
public void onCreate() {
super.onCreate();
context = getApplicationContext();
player = ExoPlayerFactory.newSimpleInstance(context, new DefaultTrackSelector());
playerNotificationManager = PlayerNotificationManager.createWithNotificationChannel(context, "My_channel_id", R.string.app_name, R.string.app_name, 123, mediaDescriptionAdapter, new PlayerNotificationManager.NotificationListener() {
@Override
public void onNotificationCancelled(int notificationId, boolean dismissedByUser) {
stopSelf();
}
@Override
public void onNotificationPosted(int notificationId, Notification notification, boolean ongoing) {
if(ongoing)
startForeground(notificationId,notification);
}
});
player.addListener(new Player.EventListener() {
@Override
public void onPlaybackStateChanged(int state) {
int pos = player.getCurrentWindowIndex();
PlayerSingleton.getInstance().audioFile = PlayerSingleton.getInstance().playingList.get(pos);
/*Bitmap b = coverpicture(PlayerSingleton.getInstance().audioFile.getPath());
if(b==null){
playerView.setBackground();
}else{
playerView.setBackground(null);
playerView.setBackgroundColor(Color.parseColor("#FFFFFFFF"));
}*/
}
@Override
public void onIsPlayingChanged(boolean isPlaying) {
if(!isPlaying){
stopForeground(false);
}else{
playerNotificationManager.setPlayer(player);
player.play();
}
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
playerNotificationManager.setPlayer(null);
player.release();
player = null;
PlayerSingleton.getInstance().audioFile = null;
PlayerSingleton.getInstance().playingList = new ArrayList<>();
new Thread(()->{
ActivityManager activityManager = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
List<ActivityManager.RunningAppProcessInfo> appProcesses = activityManager.getRunningAppProcesses();
if (appProcesses != null){
final String packageName = context.getPackageName();
for (ActivityManager.RunningAppProcessInfo appProcess : appProcesses) {
if (appProcess.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND && appProcess.processName.equals(packageName)) {
Intent i = new Intent(this, PlayerActivity.class);
i.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TOP);
i.putExtra("STOP", "STOP");
context.startActivity(i);
}
}
}
}).start();
}
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}
private PlayerNotificationManager.MediaDescriptionAdapter mediaDescriptionAdapter = new PlayerNotificationManager.MediaDescriptionAdapter() {
@Override
public String getCurrentSubText(Player player) {
return " ";
}
@Override
public String getCurrentContentTitle(Player player) {
if(PlayerSingleton.getInstance().playingList.size()>player.getCurrentWindowIndex())
return PlayerSingleton.getInstance().playingList.get(player.getCurrentWindowIndex()).getTitle();
else
return "";
}
@Override
public PendingIntent createCurrentContentIntent(Player player) {
Intent intentForeground = new Intent(context, PlayerActivity.class)
.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
return PendingIntent.getActivity(getApplicationContext(), 0, intentForeground, 0);
}
@Override
public String getCurrentContentText(Player player) {
if(PlayerSingleton.getInstance().playingList.size()>player.getCurrentWindowIndex())
return PlayerSingleton.getInstance().playingList.get(player.getCurrentWindowIndex()).getAlbum();
else
return "";
}
@Override
public Bitmap getCurrentLargeIcon(Player player, PlayerNotificationManager.BitmapCallback callback) {
if(PlayerSingleton.getInstance().playingList.size()>player.getCurrentWindowIndex())
return coverpicture(PlayerSingleton.getInstance().playingList.get(player.getCurrentWindowIndex()).getPath());
else
return null;
}
};
PlayerNotificationManager playerNotificationManager;
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
String where = intent.getStringExtra("WHERE");
String path = intent.getStringExtra("PATH");
if(PlayerSingleton.getInstance().audioFile!=null) {
if (!path.equals(PlayerSingleton.getInstance().audioFile.getPath())) {
player.pause();
}
}
new StartOperation(where,path).execute();
return START_STICKY;
}
static Bitmap coverpicture(String path) {
MediaMetadataRetriever mr;
byte[] byte1 = new byte[1];
mr = new MediaMetadataRetriever();
mr.setDataSource(path);
try {
byte1 = mr.getEmbeddedPicture();
mr.release();
}catch (Exception e){
e.printStackTrace();
}
if(byte1 != null) {
return BitmapFactory.decodeByteArray(byte1, 0, byte1.length);
}
else {
return null;
}
}
public class StartOperation extends AsyncTask{
String where,path;
int pos;
ConcatenatingMediaSource concatenatingMediaSource;
public StartOperation(String where,String path){
this.where = where;
this.path = path;
}
@Override
protected Object doInBackground(Object... objects) {
PlayerSingleton playerSingleton = PlayerSingleton.getInstance();
playerSingleton.playingList = new ArrayList<>();
playerSingleton.audioFile = null;
if(where!=null&&path!=null){
switch (where) {
case "search":
playerSingleton.playingList = audioFileDatabase.audioFileDao().getAudioFilesStatic();
playerSingleton.audioFile = audioFileDatabase.audioFileDao().checkforExist(path).get(0);
pos = playerSingleton.playingList.indexOf(playerSingleton.audioFile);
break;
case "fav":
playerSingleton.playingList = audioFileDatabase.audioFileDao().getAllFavStatic();
playerSingleton.audioFile = audioFileDatabase.audioFileDao().checkforExist(path).get(0);
pos = playerSingleton.playingList.indexOf(playerSingleton.audioFile);
break;
case "folder":
playerSingleton.audioFile = audioFileDatabase.audioFileDao().checkforExist(path).get(0);
playerSingleton.playingList = audioFileDatabase.audioFileDao().selectByFolderStatic(playerSingleton.audioFile.getFolder());
pos = playerSingleton.playingList.indexOf(playerSingleton.audioFile);
break;
case "album":
playerSingleton.audioFile = audioFileDatabase.audioFileDao().checkforExist(path).get(0);
playerSingleton.playingList = audioFileDatabase.audioFileDao().selectByAlbumStatic(playerSingleton.audioFile.getAlbum());
pos = playerSingleton.playingList.indexOf(playerSingleton.audioFile);
break;
default:
new Handler(Looper.getMainLooper()).post(() -> Toast.makeText(context, "Error", Toast.LENGTH_SHORT).show());
stopSelf();
}
}
DefaultDataSourceFactory dataSourceFactory = new DefaultDataSourceFactory(
context, Util.getUserAgent(context, getString(R.string.app_name)));
concatenatingMediaSource = new ConcatenatingMediaSource();
for (int i = 0; i < playerSingleton.playingList.size(); i++) {
MediaItem mediaItem = MediaItem.fromUri(Uri.parse(playerSingleton.playingList.get(i).getPath()));
MediaSource mediaSource = new ProgressiveMediaSource.Factory(dataSourceFactory).createMediaSource(mediaItem);
//previous new ExtractorMediaSource.Factory
///CHECK
concatenatingMediaSource.addMediaSource(mediaSource);
}
return null;
}
@Override
protected void onPostExecute(Object o) {
super.onPostExecute(o);
player.setMediaSource(concatenatingMediaSource);
player.prepare();
player.seekTo(pos,0);
Log.e("TOT"+PlayerSingleton.getInstance().playingList.size(),"pos"+pos);
playerNotificationManager.setPlayer(player);
playerView.setPlayer(player);
playerControlView.setPlayer(player);
player.play();
}
}
}
我怀疑服务是由于android的一些电源管理限制而关闭的。那些是什么?如何克服这些呢?
答案很简单。我正在运行调试版本。我创建了一个密钥库和一个密钥，签署了我的应用程序，并创建了一个发布版本。现在运行正常。