java – Android set()和setExact()以不正确的间隔触发警报

我正在开发一个应该每60秒执行一次任务的应用程序.由于 Android 4.4中的警报存在一些准确性问题,其中所有警报都不准确,我选择了链式模型：BroadcastReceiver触发第一个警报,每个警报依次设置下一个警报.

问题是,即使我以60秒(60000毫秒)的间隔设置警报,警报也会以5秒的间隔触发,有时甚至更少.我已经在我的Nexus 5(Android 5.1.1)和Android 5.0.1仿真器上测试了代码,两者都给出了相同的结果.
我应该指出,两个接收器都在AndroidManifest上注册,我的应用程序具有RECEIVE_BOOT_COMPLETED权限.

编辑：setExact()导致完全相同的问题

StartupReceiver.java(BroadcastReceiver for BOOT_COMPLETED)：

public class StartupReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context,Intent intent) {
        Log.d(TAG,"Got the BOOT_COMPLETED signal");
        // Get the first alarm to be invoked immediately
        AlarmReceiver.setNextScanAlarm(context,0);
    }
}

AlarmReceiver.java

public class AlarmReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context,Intent intent) {
        // Start the service
        Intent startServiceIntent = new Intent(context,BackgroundService.class);
        startServiceIntent.putExtra("interval",60000);
        startServiceIntent.putExtra("action","scan");
        context.startService(startServiceIntent);

        // Schedule the next alarm
        setNextScanAlarm(context,60000);
    }

    public static void setNextScanAlarm(Context context,int interval) {
        Intent scanIntent = new Intent(context,AlarmReceiver.class);
        scanIntent.putExtra("interval",interval);
        scanIntent.putExtra("action","scan");
        PendingIntent pendingIntent = PendingIntent.getBroadcast(
                context,scanIntent,PendingIntent.FLAG_ONE_SHOT);


        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(
                AlarmManager.ELAPSED_REALTIME_WAKEUP,interval,pendingIntent);
    }
}

可能是什么问题呢？

alarmManager.set(
                AlarmManager.ELAPSED_REALTIME_WAKEUP,pendingIntent);

public static void setNextScanAlarm(Context context,int interval) {
        //create the intent the same way as before
        Intent scanIntent = new Intent(context,PendingIntent.FLAG_ONE_SHOT);

        //create new variables to calculate the correct time for this to go off
        long timeRightNow = System.elapsedRealTime() //use something else if you change AlarmManager type
        long timeWhenIShouldGoOff = timeRightNow + interval;

        //use the new timeWhenIShouldGoOff variable instead of interval
        AlarmManager alarmManager = (AlarmManager) context.getSystemService(Context.ALARM_SERVICE);
        alarmManager.set(
                AlarmManager.ELAPSED_REALTIME_WAKEUP,timeWhenIShouldGoOff,pendingIntent);
    }