Question

我了解到，其他通知通道现在需要显示通知，以向运行android OS Oreo或更高版本的android设备显示通知，但是我仍然很难理解在通知服务中添加频道的基本知识。
就像在我当前的媒体播放器项目中一样，我想在歌曲开始播放时显示媒体控制通知，因此我按照教程进行操作，能够使通知出现，但仅在运行OS 6.0的设备中（这是我测试过的最低OS）和），而当我尝试在OS 9.0的另一台设备中运行时，什么也没出现。
我认为是因为我的频道设置不正确。

这是处理通知的类

@Override
public IBinder onBind(Intent intent) {
    return null;
}

private void handleIntent( Intent intent ) {
    if( intent == null || intent.getAction() == null )
        return;

    String action = intent.getAction();

    if( action.equalsIgnoreCase( ACTION_PLAY ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().play();
        }
    } else if( action.equalsIgnoreCase( ACTION_PAUSE ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().pause();
        }
    } else if( action.equalsIgnoreCase( ACTION_FAST_FORWARD ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().fastForward();
        }
    } else if( action.equalsIgnoreCase( ACTION_REWIND ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().rewind();
        }
    } else if( action.equalsIgnoreCase( ACTION_PREVIOUS ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().skipToPrevious();
        }
    } else if( action.equalsIgnoreCase( ACTION_NEXT ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().skipToNext();
        }
    } else if( action.equalsIgnoreCase( ACTION_STOP ) ) {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            mController.getTransportControls().stop();
        }
    }
}

private Notification.Action generateAction(int icon, String title, String intentAction ) {
    Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
    intent.setAction( intentAction );
    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        return new Notification.Action.Builder( icon, title, pendingIntent ).build();
    }
    return null;
}

private void buildNotification( Notification.Action action ) {
    Notification.MediaStyle style = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        style = new Notification.MediaStyle();
    }

    Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
    intent.setAction( ACTION_STOP );
    PendingIntent pendingIntent = PendingIntent.getService(getApplicationContext(), 1, intent, 0);
    Notification.Builder builder = null;
    if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.O) {
        builder = new Notification.Builder(this)
                .setSmallIcon(R.mipmap.custom_launcher)
                .setContentTitle("Media Title")
                .setContentText("Media Artist")
                .setDeleteIntent(pendingIntent)
                .setStyle(style);

        NotificationManager mNotifyMgr =
                (NotificationManager) getSystemService(NOTIFICATION_SERVICE);

        // Since android Oreo notification channel is needed.
        NotificationChannel channel = new NotificationChannel(channelID,
                "Channel human readable title",
                NotificationManager.IMPORTANCE_DEFAULT);
        if (mNotifyMgr != null) {
            mNotifyMgr.createNotificationChannel(channel);
        }

    }



    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        assert builder != null;
        builder.addAction( generateAction( android.R.drawable.ic_media_previous, "Previous", ACTION_PREVIOUS ) );
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder.addAction( generateAction( android.R.drawable.ic_media_rew, "Rewind", ACTION_REWIND ) );
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder.addAction( action );
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder.addAction( generateAction( android.R.drawable.ic_media_ff, "Fast Foward", ACTION_FAST_FORWARD ) );
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        builder.addAction( generateAction( android.R.drawable.ic_media_next, "Next", ACTION_NEXT ) );
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        style.setShowActionsInCompactView(0,1,2,3,4);
    }

    NotificationManager notificationManager = (NotificationManager) getSystemService( Context.NOTIFICATION_SERVICE );
    notificationManager.notify( 1, builder.build() );
}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    if( mManager == null ) {
        initMediaSessions();
    }

    handleIntent( intent );
    return super.onStartCommand(intent, flags, startId);
}

private void initMediaSessions() {
    mMediaPlayer = new MediaPlayer();


    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        mSession = new MediaSession(getApplicationContext(), "simple player session");
    }
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        mController =new MediaController(getApplicationContext(), mSession.getSessionToken());
    }

    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        mSession.setCallback(new MediaSession.Callback(){
                                 @Override
                                 public void onPlay() {
                                     super.onPlay();
                                     Log.e( "MediaPlayerService", "onPlay");
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
                                 }

                                 @Override
                                 public void onPause() {
                                     super.onPause();
                                     Log.e( "MediaPlayerService", "onPause");
                                     buildNotification(generateAction(android.R.drawable.ic_media_play, "Play", ACTION_PLAY));
                                 }

                                 @Override
                                 public void onSkipToNext() {
                                     super.onSkipToNext();
                                     Log.e( "MediaPlayerService", "onSkipToNext");
                                     //Change media here
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
                                 }

                                 @Override
                                 public void onSkipToPrevious() {
                                     super.onSkipToPrevious();
                                     Log.e( "MediaPlayerService", "onSkipToPrevious");
                                     //Change media here
                                     buildNotification( generateAction( android.R.drawable.ic_media_pause, "Pause", ACTION_PAUSE ) );
                                 }

                                 @Override
                                 public void onFastForward() {
                                     super.onFastForward();
                                     Log.e( "MediaPlayerService", "onFastForward");
                                     //Manipulate current media here
                                 }

                                 @Override
                                 public void onRewind() {
                                     super.onRewind();
                                     Log.e( "MediaPlayerService", "onRewind");
                                     //Manipulate current media here
                                 }

                                 @Override
                                 public void onStop() {
                                     super.onStop();
                                     Log.e( "MediaPlayerService", "onStop");
                                     //Stop media player here
                                     NotificationManager notificationManager = (NotificationManager) getApplicationContext().getSystemService(Context.NOTIFICATION_SERVICE);
                                     notificationManager.cancel( 1 );
                                     Intent intent = new Intent( getApplicationContext(), MediaPlayerService.class );
                                     stopService( intent );
                                 }

                                 @Override
                                 public void onSeekTo(long pos) {
                                     super.onSeekTo(pos);
                                 }

                                 @Override
                                 public void onSetRating(Rating rating) {
                                     super.onSetRating(rating);
                                 }
                             }
        );
    }
}

@Override
public boolean onUnbind(Intent intent) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        mSession.release();
    }
    return super.onUnbind(intent);
}

Answer 1

要创建NotificationBuilder时，必须将GroupId传递给它。

builder = new Notification.Builder(context, channelId)

添加通知通道以在高级Android中显示通知

1 个答案: