Question

我正在开发一个应用程序，并且想播放背景音乐，因此我使用服务来播放和停止。它运作完美。另外，我想显示暂停，播放...的通知，但该通知未出现在Android 8.0上。我使用andorid 3.0.1，compileSdkVersion = 26，targetSdkVersion = 26 ，minSdkVersion = 15

这是我当前的代码

public class BackgroundSoundService extends Service {
    private static final String TAG = "BackgroundSoundService";
    MediaPlayer player;
    int length;
    static int t;
    private static final String LOG_TAG = "ForegroundService";
    String channelId = "channel-01";
    Notification notification;
    NotificationChannel mChannel;
    String name = "volume";
    int id = 0;
    int importance = NotificationManager.IMPORTANCE_HIGH;

    public IBinder onBind(Intent arg0) {
        Log.i(TAG, "onBind()");
        return null;
    }

    @Override
    public void onCreate() {
        super.onCreate();
        player = MediaPlayer.create(this, R.raw.jorgesys_song);
       ....
    }

    @RequiresApi(api = Build.VERSION_CODES.O)
    public int onStartCommand(Intent intent, int flags, int startId) {
        if (intent.getAction().equals(Constants.ACTION.STARTFOREGROUND_ACTION)) {
            Intent notificationIntent = new Intent(this, MainActivity.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, BackgroundSoundService.class);
            previousIntent.setAction(Constants.ACTION.PREV_ACTION);
            PendingIntent ppreviousIntent = PendingIntent.getService(this, 0,
                    previousIntent, 0);

            Intent playIntent = new Intent(this, BackgroundSoundService.class);
            playIntent.setAction(Constants.ACTION.PLAY_ACTION);
            PendingIntent pplayIntent = PendingIntent.getService(this, 0,
                    playIntent, 0);

            Intent nextIntent = new Intent(this, BackgroundSoundService.class);
            nextIntent.setAction(Constants.ACTION.NEXT_ACTION);
            PendingIntent pnextIntent = PendingIntent.getService(this, 0,
                    nextIntent, 0);

            Bitmap icon = BitmapFactory.decodeResource(getResources(),
                    R.drawable.esp);

            notification = new NotificationCompat.Builder(this)
                    .setContentTitle("Truiton Music Player")
                    .setTicker("Truiton Music Player")
                    .setContentText("My Music")
                    .setSmallIcon(R.drawable.esp)
                    .setLargeIcon(
                            Bitmap.createScaledBitmap(icon, 128, 128, false))
                    .setContentIntent(pendingIntent)
                    .setOngoing(true)
                    .setPriority(Notification.PRIORITY_MAX).setWhen(0)
                    .addAction(R.drawable.ic_per,
                            "", ppreviousIntent)
                    .addAction(R.drawable.ic_play, "",
                            pplayIntent)
                    .addAction(R.drawable.ic_next, "",
                            pnextIntent).build();

            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                NotificationChannel mChannel = new NotificationChannel(channelId, name,
                        importance);
                mChannel.setShowBadge(true);
                NotificationManager mNotifyMgr =
                        (NotificationManager)
                                getSystemService(Context.NOTIFICATION_SERVICE);
                mNotifyMgr.createNotificationChannel(mChannel);

                // Builds the notification and issues it.
                mNotifyMgr.notify(id, notification);
            }


            startForeground(Constants.NOTIFICATION_ID.FOREGROUND_SERVICE,
                    notification);


        } else if (intent.getAction().equals(Constants.ACTION.PREV_ACTION)) {
            Log.i(LOG_TAG, "Clicked Previous");
        } else if (intent.getAction().equals(Constants.ACTION.PLAY_ACTION)) {
            Log.i(LOG_TAG, "Clicked Play");
        } else if (intent.getAction().equals(Constants.ACTION.NEXT_ACTION)) {
            Log.i(LOG_TAG, "Clicked Next");
        } else if (intent.getAction().equals(
                Constants.ACTION.STOPFOREGROUND_ACTION)) {
            Log.i(LOG_TAG, "Received Stop Foreground Intent");
            stopForeground(true);
            stopSelf();
        }


        player.start();
        return Service.START_STICKY;
    }

还有另一个问题：在通知中，我有三个按钮，并为它们添加了3张图像，但是它们的背景没有改变。预先感谢

Answer 1

在有条件的情况下添加此行

notification.setChannelId(mChannel);

喜欢这个：

 if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel mChannel = new NotificationChannel(channelId, name,
                    importance);
            mChannel.setShowBadge(true);

            notification.setChannelId(mChannel);//add this line

            NotificationManager mNotifyMgr =
                    (NotificationManager)
                            getSystemService(Context.NOTIFICATION_SERVICE);
            mNotifyMgr.createNotificationChannel(mChannel);

            // Builds the notification and issues it.
            mNotifyMgr.notify(id, notification);
        }

Answer 2

请尝试以下操作：

UIImage

还请在运行时添加 RECEIVE_SMS 权限。

Answer 3

来自Android官方网站：

以Android 8.0（API级别26）为目标时，您必须实现更多的通知渠道。如果您的targetSdkVersion设置为25或较低，当您的应用在Android 8.0（API级别26）或更高版本上运行时，行为与运行Android 7.1（API级别）的设备相同 25）或更低。

因为您的targetSdkVersion是26，所以将代码更改为：

notification = new NotificationCompat.Builder(this, channelId) // TODO: Add channelId here
                    .setContentTitle("Truiton Music Player")
                    .setTicker("Truiton Music Player")
                    .setContentText("My Music")
                    .setSmallIcon(R.drawable.esp)
                    .setLargeIcon(
                            Bitmap.createScaledBitmap(icon, 128, 128, false))
                    .setContentIntent(pendingIntent)
                    .setOngoing(true)
                    .setPriority(Notification.PRIORITY_MAX).setWhen(0)
                    .addAction(R.drawable.ic_per,
                            "", ppreviousIntent)
                    .addAction(R.drawable.ic_play, "",
                            pplayIntent)
                    .addAction(R.drawable.ic_next, "",
                            pnextIntent).build();

// TODO: Move this statement out of if block
NotificationManager mNotifyMgr =
            (NotificationManager)
                    getSystemService(Context.NOTIFICATION_SERVICE); 

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
    NotificationChannel mChannel = new NotificationChannel(channelId, name,
            importance);
    mChannel.setShowBadge(true);
    mNotifyMgr.createNotificationChannel(mChannel);
}

// TODO: Move this statement out of if block too.    
// Builds the notification and issues it.
mNotifyMgr.notify(id, notification);

通知未在Oreo上显示

3 个答案: