Android Studio AlarmManager后台重复运行

我正在尝试创建一个后台服务，因此当应用程序关闭时，后台将运行一个服务，该服务将使用AlarmManager每隔5秒向手机显示一个通知

我目前将java服务文件设置为：

package com.racecoursedatatechnologies.rdtstockmanagement;

import android.app.Service;
import android.app.AlarmManager;
import android.content.Intent;
import android.util.Log;
import android.os.Binder;
import android.os.IBinder;
import android.app.PendingIntent;
import android.app.PendingIntent;

public class BackIntentService extends Service {

    private PendingIntent pendingIntent;
    private AlarmManager manager;

    public class LocalBinder extends Binder {
        BackIntentService getService() {
            return BackIntentService.this;
        }
    }

    @Override
    public void onCreate() {
        startAlarm();
    }

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {
        Log.d("LocalService", "Received start id " + startId + ": " + intent);
        return START_NOT_STICKY;
    }

    public void startAlarm()
    {
        manager = (AlarmManager)getSystemService(this.ALARM_SERVICE);
        Intent intent = new Intent(this, BackNotifyAlarm.class);
        pendingIntent = PendingIntent.getBroadcast(this, 0, intent, 0);

        int interval = 1000 * 5;

        manager.setRepeating(AlarmManager.RTC_WAKEUP, System.currentTimeMillis(), interval, pendingIntent);
        Toast.makeText(this, "Alarm Started", Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onDestroy() {

        // Tell the user we stopped.
        Log.d("LocalService", "Stopped");
    }

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

    // This is the object that receives interactions from clients.  See
    // RemoteService for a more complete example.
    private final IBinder mBinder = new LocalBinder();

    /**
     * Show a notification while this service is running.
     */
    private void showNotification() {

        //Create a notification and set it's content and display it.
        NotificationManager notif=(NotificationManager)getSystemService(NOTIFICATION_SERVICE);
        Notification notify=new Notification.Builder
                (getApplicationContext()).setContentTitle("RDT Stock").setContentText("HELLOOO").
                setContentTitle("Low Stock Items").setSmallIcon(R.drawable.noticon).build();

        notify.flags |= Notification.FLAG_AUTO_CANCEL;
        notif.notify(11, notify);
    }

}

BackNotifyAlarm广播java文件：

public class BackNotifyAlarm extends BroadcastReceiver
{
    @Override
    public void onReceive(Context context, Intent intent)
    {
        //PowerManager pm = (PowerManager) context.getSystemService(Context.POWER_SERVICE);
        //PowerManager.WakeLock wl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "");
        //wl.acquire();

        Toast.makeText(context, "Notification sent!", Toast.LENGTH_LONG).show();

        //wl.release();

    }

---

我正在启动

MainActivity

文件中的服务。服务启动，然后服务运行警报，但是警报似乎只运行一次，不会重复，知道为什么吗？

在Android 6.0+上，您想要的东西实际上是不可能的。最接近的解决方案是使用

AlarmManager

（可能与

服务配套使用）或
JobScheduler
（在Android 5.0+上）。不要试图让您的服务连续运行，只是为了观察时钟的滴答声。我已经用中的AlarmManager更新了主代码。但由于某些原因，它不是每5秒运行一次，似乎需要更长的时间。你不能这么快发出警报。在安卓5.1+上，最短时间为一分钟，在安卓6.0+上，在打瞌睡模式下的频率会低很多。干杯。我现在用一个线程来排序。