android - AlarmManager RTC_WAKEUP 耗尽电池

Question

我有一个在后台运行的服务，它会定期从服务器下载数据。我需要每隔一小时下载一次数据。但是电池消耗得很快。代码如下。如何使闹钟更省电？

public class BackgroundFetchService extends Service {

    @Override
    public int onStartCommand(Intent intent, int flags, int startId) {

        int s = super.onStartCommand(intent, flags, startId);

        BackgroundFetchManager.getSharedInstance().setAlarmStatus(false);

        TherapyManager.getSharedInstance().downloadData(new DataManager.DataManagerListener() {
            @Override
            public void onCompletion(AppError error) {
                stopSelf();
            }
        });

        return s;
    }

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

    @Override
    public void onDestroy() {
        //restart this service again in one hour

        if(!BackgroundFetchManager.getSharedInstance().getAlarmStatus()) {
            AlarmManager alarm = (AlarmManager) getSystemService(ALARM_SERVICE);
            alarm.set(
                    alarm.RTC_WAKEUP,
                    System.currentTimeMillis() + (1000 * 60 * 60),
                    PendingIntent.getService(this, 0, new Intent(this, BackgroundFetchService.class), 0)
            );
            BackgroundFetchManager.getSharedInstance().setAlarmStatus(true);
        }

        super.onDestroy();
    }
}

Answer 1

尝试仅使用 RTC，因为根据文档:https://developer.android.com/training/scheduling/alarms.html , RTC 在指定时间触发未决 Intent 但不唤醒设备。

例如:

AlarmManager alarm = (AlarmManager) getSystemService(ALARM_SERVICE);
alarm.set(
        alarm.RTC,
        System.currentTimeMillis() + (1000 * 60 * 60),
        PendingIntent.getService(this, 0, new Intent(this, BackgroundFetchService.class), 0)
);
BackgroundFetchManager.getSharedInstance().setAlarmStatus(true);