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サービスで音楽を再生するアプリケーションを作成しました。サービスはかなりうまく動作し、音楽は期待どおりに再生されます。私が直面する問題は、音声が並行して再生されるバックグラウンドで音楽が再び再生される前に、通知の再生ボタンを再度クリックするときです。 mediaplayer.isPlaying状態が機能していないようです！あなたは曲が再び再生を開始による先のように新しいサービスインスタンスが作成され、あなたの通知に意図ので、新しいMediaPlayerのインスタンスと..を作成すると マイコードは通知バーで再生ボタンがクリックされたときに複数回メディアを再生する
public class MediaPlayerService extends Service implements MediaPlayer.OnCompletionListener {
Notification status;
private final String LOG_TAG = "NotificationService";
private MediaPlayer mediaPlayer;;
private MediaSessionManager mManager;
private MediaSession mSession;
private MediaController mController;
/** indicates how to behave if the service is killed */
int mStartMode;
/** interface for clients that bind */
IBinder mBinder;
/** indicates whether onRebind should be used */
boolean mAllowRebind;
/** Called when the service is being created. */
@Override
public void onCreate() {
mediaPlayer = new MediaPlayer();
mediaPlayer.reset();
mediaPlayer.setOnCompletionListener(this);
}
@Nullable
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
AssetFileDescriptor afd = null;
try {
afd = getAssets().openFd("mySound.mp3");
mediaPlayer.setDataSource(afd.getFileDescriptor(),afd.getStartOffset(),afd.getLength());
mediaPlayer.prepare();
if(!mediaPlayer.isPlaying()) {
Toast.makeText(this, "Not Playing", Toast.LENGTH_SHORT).show();
mediaPlayer.start();
}
else{
Toast.makeText(this, "Playing", Toast.LENGTH_SHORT).show();
mediaPlayer.pause();
}
} catch (IOException e) {
e.printStackTrace();
}
if (intent.getAction().equals(Constants.ACTION.STARTFOREGROUND_ACTION)) {
showNotification();
Toast.makeText(this, "Service Started", Toast.LENGTH_SHORT).show();
} else if (intent.getAction().equals(Constants.ACTION.PREV_ACTION)) {
Toast.makeText(this, "Clicked Previous", Toast.LENGTH_SHORT).show();
Log.i(LOG_TAG, "Clicked Previous");
} else if (intent.getAction().equals(Constants.ACTION.PLAY_ACTION)) {
if(mediaPlayer.isPlaying()) {
Toast.makeText(this, "Playing", Toast.LENGTH_SHORT).show();
}
else{
Toast.makeText(this, "Not Playing", Toast.LENGTH_SHORT).show();
}
Log.i(LOG_TAG, "Clicked Play");
} else if (intent.getAction().equals(Constants.ACTION.NEXT_ACTION)) {
Toast.makeText(this, "Clicked Next", Toast.LENGTH_SHORT).show();
Log.i(LOG_TAG, "Clicked Next");
} else if (intent.getAction().equals(
Constants.ACTION.STOPFOREGROUND_ACTION)) {
if(mediaPlayer.isPlaying()) {
mediaPlayer.stop();
}
stopForeground(true);
stopSelf();
}
return START_STICKY;
}
@Override
public void onCompletion(MediaPlayer mp) {
showNotificationClose();
Toast.makeText(this, "OVER", Toast.LENGTH_SHORT).show();
}
/** A client is binding to the service with bindService() */
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}
/** Called when all clients have unbound with unbindService() */
@Override
public boolean onUnbind(Intent intent) {
return mAllowRebind;
}
/** Called when a client is binding to the service with bindService()*/
@Override
public void onRebind(Intent intent) {
}
/** Called when The service is no longer used and is being destroyed */
@Override
public void onDestroy() {
}
private void showNotification() {
// Using RemoteViews to bind custom layouts into Notification
RemoteViews views = new RemoteViews(getPackageName(),
R.layout.status_bar);
RemoteViews bigViews = new RemoteViews(getPackageName(),
R.layout.status_bar_expanded);
// showing default album image
views.setViewVisibility(R.id.status_bar_icon, View.VISIBLE);
views.setViewVisibility(R.id.status_bar_album_art, View.GONE);
bigViews.setImageViewBitmap(R.id.status_bar_album_art,
Constants.getDefaultAlbumArt(this));
Intent notificationIntent = new Intent(this, myHome.class);
notificationIntent.setAction(Constants.ACTION.MAIN_ACTION);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
Intent previousIntent = new Intent(this, MediaPlayerService.class);
previousIntent.setAction(Constants.ACTION.PREV_ACTION);
PendingIntent ppreviousIntent = PendingIntent.getService(this, 0,
previousIntent, 0);
Intent playIntent = new Intent(this, MediaPlayerService.class);
playIntent.setAction(Constants.ACTION.PLAY_ACTION);
PendingIntent pplayIntent = PendingIntent.getService(this, 0,
playIntent, 0);
Intent nextIntent = new Intent(this, MediaPlayerService.class);
nextIntent.setAction(Constants.ACTION.NEXT_ACTION);
PendingIntent pnextIntent = PendingIntent.getService(this, 0,
nextIntent, 0);
Intent closeIntent = new Intent(this, MediaPlayerService.class);
closeIntent.setAction(Constants.ACTION.STOPFOREGROUND_ACTION);
PendingIntent pcloseIntent = PendingIntent.getService(this, 0,
closeIntent, 0);
views.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
views.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
views.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
views.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
views.setImageViewResource(R.id.status_bar_play,
R.drawable.apollo_holo_dark_pause);
bigViews.setImageViewResource(R.id.status_bar_play,
R.drawable.apollo_holo_dark_pause);
views.setTextViewText(R.id.status_bar_track_name, "Cheap Thrills");
bigViews.setTextViewText(R.id.status_bar_track_name, "Cheap Thrills");
views.setTextViewText(R.id.status_bar_artist_name, "Sia");
bigViews.setTextViewText(R.id.status_bar_artist_name, "Sia");
bigViews.setTextViewText(R.id.status_bar_album_name, "Cheap Thrills");
status = new Notification.Builder(this).build();
status.contentView = views;
status.bigContentView = bigViews;
status.flags = Notification.FLAG_ONGOING_EVENT;
status.icon = R.drawable.icon;
status.contentIntent = pendingIntent;
startForeground(Constants.NOTIFICATION_ID.FOREGROUND_SERVICE, status);
}
private void showNotificationClose() {
// Using RemoteViews to bind custom layouts into Notification
RemoteViews views = new RemoteViews(getPackageName(),
R.layout.status_bar);
RemoteViews bigViews = new RemoteViews(getPackageName(),
R.layout.status_bar_expanded);
// showing default album image
views.setViewVisibility(R.id.status_bar_icon, View.VISIBLE);
views.setViewVisibility(R.id.status_bar_album_art, View.GONE);
bigViews.setImageViewBitmap(R.id.status_bar_album_art,
Constants.getDefaultAlbumArt(this));
Intent notificationIntent = new Intent(this, myHome.class);
notificationIntent.setAction(Constants.ACTION.MAIN_ACTION);
notificationIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK
| Intent.FLAG_ACTIVITY_CLEAR_TASK);
PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
notificationIntent, 0);
Intent previousIntent = new Intent(this, MediaPlayerService.class);
previousIntent.setAction(Constants.ACTION.PREV_ACTION);
PendingIntent ppreviousIntent = PendingIntent.getService(this, 0,
previousIntent, 0);
Intent playIntent = new Intent(this, MediaPlayerService.class);
playIntent.setAction(Constants.ACTION.PLAY_ACTION);
PendingIntent pplayIntent = PendingIntent.getService(this, 0,
playIntent, 0);
Intent nextIntent = new Intent(this, MediaPlayerService.class);
nextIntent.setAction(Constants.ACTION.NEXT_ACTION);
PendingIntent pnextIntent = PendingIntent.getService(this, 0,
nextIntent, 0);
Intent closeIntent = new Intent(this, MediaPlayerService.class);
closeIntent.setAction(Constants.ACTION.STOPFOREGROUND_ACTION);
PendingIntent pcloseIntent = PendingIntent.getService(this, 0,
closeIntent, 0);
views.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_play, pplayIntent);
views.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_next, pnextIntent);
views.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_prev, ppreviousIntent);
views.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
bigViews.setOnClickPendingIntent(R.id.status_bar_collapse, pcloseIntent);
views.setImageViewResource(R.id.status_bar_play,
R.drawable.apollo_holo_dark_play);
bigViews.setImageViewResource(R.id.status_bar_play,
R.drawable.apollo_holo_dark_play);
views.setTextViewText(R.id.status_bar_track_name, "Cheap Thrills");
bigViews.setTextViewText(R.id.status_bar_track_name, "Cheap Thrills");
views.setTextViewText(R.id.status_bar_artist_name, "Sia");
bigViews.setTextViewText(R.id.status_bar_artist_name, "Sia");
bigViews.setTextViewText(R.id.status_bar_album_name, "Cheap Thrills");
status = new Notification.Builder(this).build();
status.contentView = views;
status.bigContentView = bigViews;
status.flags = Notification.FLAG_ONGOING_EVENT;
status.icon = R.drawable.icon;
status.contentIntent = pendingIntent;
startForeground(Constants.NOTIFICATION_ID.FOREGROUND_SERVICE, status);
}
}
'onResume（）で再生中かどうかを確認してください。 – hrskrs
@hrskrs通知から再生ボタンを押します。次に、それはonResume関数を呼び出すでしょうか？また、サービスにはonResume関数がありますか？ –