StartForeground_Service仍然不起作用

问题内容

我正在开发蓝牙广告程序。它在 sdk 28 中编译。根据文档的要求，我添加了 android.permission.foreground 权限。但即使是现在，如果单击“蓝牙广告”按钮并调用 startforeground()，应用程序也会崩溃。

在我添加权限后，捕获从未达到。在添加权限之前，我仍然会到达捕获序列，并且消息告诉我，我必须添加上面提到的 foreground_service 权限。

对于这个应用程序，我使用 java。

`/**
     * Starts BLE Advertising.
     */
    private void startAdvertising() {
        goForeground();

    Log.d(TAG, "Service: Starting Advertising");

    if (mAdvertiseCallback == null) {
        AdvertiseSettings settings = buildAdvertiseSettings();
        AdvertiseData data = buildAdvertiseData();
        mAdvertiseCallback = new SampleAdvertiseCallback();

        if (mBluetoothLeAdvertiser != null) {
            mBluetoothLeAdvertiser.startAdvertising(settings, data,
                    mAdvertiseCallback);
        }
    }
}

/**
 * Move service to the foreground, to avoid execution limits on background processes.
 *
 * Callers should call stopForeground(true) when background work is complete.
 */
private void goForeground() {
    Intent notificationIntent = new Intent(this, MainActivity.class);
    PendingIntent pendingIntent = PendingIntent.getActivity(this, 0,
            notificationIntent, 0);
    Notification n = new Notification.Builder(this)
            .setContentTitle("Advertising device via Bluetooth")
            .setContentText("This device is discoverable to others nearby.")
            .setSmallIcon(R.drawable.ic_launcher)
            .setContentIntent(pendingIntent)
            .build();
    //TODO: startForeground throws Exception. Has to be Fixed
    try{
        startForeground(FOREGROUND_NOTIFICATION_ID, n);
    } catch (SecurityException e) {
        Toast toast = Toast.makeText(this, e.getMessage() + " Exception Throwed", Toast.LENGTH_SHORT);
        toast.getView().setBackgroundColor(Color.parseColor("#FF0FF0"));
        toast.show();
    }

}`

有人要求我提供堆栈跟踪，所以这就是：

致命异常：主要 进程：com.example.android.bluetoothadvertisements，pid：9760 android.app.remoteserviceexception$cannotpostforegroundservicenotificationexception：startforeground 的错误通知 在 android.app.activitythread.throwremoteserviceexception(activitythread.java:1983) 在 android.app.activitythread.-$$nest$mthrowremoteserviceexception（来源未知：0） 在 android.app.activitythread$h.handlemessage(activitythread.java:2242) 在 android.os.handler.dispatchmessage(handler.java:106) 在 android.os.looper.looponce(looper.java:201) 在 android.os.looper.loop(looper.java:288) 在 android.app.activitythread.main(activitythread.java:7898) 在 java.lang.reflect.method.invoke（本机方法） 在 com.android.internal.os.runtimeinit$methodandargscaller.run(runtimeinit.java:548) 在 com.android.internal.os.zygoteinit.main(zygoteinit.java:936)

正确答案

您的代码已过时：替换两行

pendingintent pendingintent = ...
notification n = ...

由

PendingIntent pendingIntent = PendingIntent.getActivity(this, 0, notificationIntent, PendingIntent.FLAG_IMMUTABLE);
NotificationChannel notificationChannel = new NotificationChannel("your_Channel_ID", "your channel name", NotificationManager.IMPORTANCE_LOW);
getSystemService(NotificationManager.class).createNotificationChannel(notificationChannel);
Notification n = new Notification.Builder(this, "your_Channel_ID")

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