问当应用程序在后台时，自定义通知音不起作用

EN

public class MyFirebaseMessagingService extends FirebaseMessagingService{

private static final String TAG = "MyFirebaseMsgService";
Utilities utils = new Utilities();
Notification notification;
@Override
public void onMessageReceived(RemoteMessage remoteMessage) {
    if (remoteMessage.getData() != null) {
        sendNotification(remoteMessage.getData().get("message"));
        Log.e(TAG,remoteMessage.getData().get("message"));
    }else{
        utils.print(TAG,"FCM Notification failed");
    }
}
private void sendNotification(String messageBody) {
    long[] v = {500,1000};

    if (!isAppIsInBackground(getApplicationContext())) {

        utils.print(TAG,"foreground");
        Log.e(TAG,"Notifcation"+messageBody);
            Intent intent = new Intent(this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            intent.putExtra("push", true);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                    PendingIntent.FLAG_ONE_SHOT);


            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                    .setContentTitle(getString(R.string.app_name))
                    .setContentText(messageBody)
                    .setAutoCancel(false)
                    .setVibrate(v)
                    .setContentIntent(pendingIntent);

            notificationBuilder.setSmallIcon(getNotificationIcon(notificationBuilder), 1);

        notification = notificationBuilder.build();
        notification.sound=Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.alert_tone);
        notification.defaults=Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE;

            NotificationManager notificationManager =
                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

            notificationManager.notify(0, notification);
    }
    else{
        if(messageBody.equalsIgnoreCase("New Incoming Ride")){
            Intent intent = new Intent(this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
          PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                   PendingIntent.FLAG_ONE_SHOT);

            Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                    .setContentTitle(getString(R.string.app_name))
                    .setContentText(messageBody)
                    .setAutoCancel(false)
                    .setVibrate(v)
                    .setSound(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.alert_tone))
                   .setContentIntent(pendingIntent);

            notificationBuilder.setSmallIcon(getNotificationIcon(notificationBuilder), 1);
            NotificationManager notificationManager =
                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notification = notificationBuilder.build();
            notification.defaults=Notification.DEFAULT_LIGHTS | Notification.DEFAULT_VIBRATE;
            notification.sound=Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.alert_tone);
            notificationManager.notify(0, notification);
        }
        else{
            Intent intent = new Intent(this, MainActivity.class);
            intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
            intent.putExtra("push", true);
            PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, intent,
                    PendingIntent.FLAG_ONE_SHOT);
            NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                    .setContentTitle(getString(R.string.app_name))
                    .setContentText(messageBody)
                    .setAutoCancel(false)
                    .setVibrate(v)
                    .setSound(Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.alert_tone))
                   .setContentIntent(pendingIntent);

            notificationBuilder.setSmallIcon(getNotificationIcon(notificationBuilder), 1);
            NotificationManager notificationManager =
                    (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
            notification = notificationBuilder.build();
            notification.sound=Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.alert_tone);
            notificationManager.notify(0, notification);
        }
    }
}

private int getNotificationIcon(NotificationCompat.Builder notificationBuilder) {
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP){
        notificationBuilder.setColor(ContextCompat.getColor(getApplicationContext(),R.color.colorPrimary));
        return  R.mipmap.ic_launcher;
    }else {
        return R.mipmap.ic_launcher;
    }
}
public static boolean isAppIsInBackground(Context context) {
    boolean isInBackground = true;
    ActivityManager am = (ActivityManager) context.getSystemService(Context.ACTIVITY_SERVICE);
    if (Build.VERSION.SDK_INT > Build.VERSION_CODES.KITKAT_WATCH) {
        List<ActivityManager.RunningAppProcessInfo> runningProcesses = am.getRunningAppProcesses();
        for (ActivityManager.RunningAppProcessInfo processInfo : runningProcesses) {
            if (processInfo.importance == ActivityManager.RunningAppProcessInfo.IMPORTANCE_FOREGROUND) {
                for (String activeProcess : processInfo.pkgList) {
                    if (activeProcess.equals(context.getPackageName())) {
                        isInBackground = false;
                    }
                }
            }
        }
    } else {
        List<ActivityManager.RunningTaskInfo> taskInfo = am.getRunningTasks(1);
        ComponentName componentInfo = taskInfo.get(0).topActivity;
        if (componentInfo.getPackageName().equals(context.getPackageName())) {
            isInBackground = false;
        }
    }
    return isInBackground;