java - Android 中广播接收器的 AlarmManager

Question

我一直在尝试使用 AlarmManager 重复某个操作，但是，它一次工作正常，然后在 20 秒后不再重复。

public class CheckingService extends Service {
    private static final String APP_TAG = "com.test";

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

    @Override
    public int onStartCommand(final Intent intent, final int flags,
                              final int startId) {
        Log.d(APP_TAG, "event received in service: " + new Date().toString());
        Toast.makeText(CheckingService.this, "TEST", Toast.LENGTH_SHORT).show();
        return Service.START_NOT_STICKY;
    }
 }

用于安排警报的广播接收器:

public class SchedulerReciever extends BroadcastReceiver {
    public SchedulerReciever() {
    }

    private static final String APP_TAG = "com.test";

    private static final int EXEC_INTERVAL = 20 * 10;

    @Override
    public void onReceive(final Context ctx, final Intent intent) {
        Log.d(APP_TAG, "onReceive() called");
        AlarmManager alarmManager = (AlarmManager) ctx
                .getSystemService(Context.ALARM_SERVICE);
        Intent i = new Intent(ctx, MyBraoadCastReciever.class); // explicit
        // intent
        PendingIntent intentExecuted = PendingIntent.getBroadcast(ctx, 0, i,
                PendingIntent.FLAG_CANCEL_CURRENT);
        Calendar now = Calendar.getInstance();
        now.add(Calendar.SECOND, 2);
        alarmManager.setRepeating(AlarmManager.RTC_WAKEUP,
                now.getTimeInMillis(), EXEC_INTERVAL, intentExecuted);
    }
}

我加载服务的广播接收器:

public class MyBraoadCastReciever extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {


            Intent eventService = new Intent(context,  CheckingService.class);
            context.startService(eventService);

    }
}

最后我的 AndroidManifest.xml 正在使用启动

<receiver android:name=".SchedulerReciever" android:process=":my_process">
        <intent-filter >
            <action android:name="android.intent.action.BOOT_COMPLETED" />
            <action android:name="android.intent.action.USER_PRESENT" />
        </intent-filter>
    </receiver>

  <service android:name=".CheckingService" android:process=":my_process" >
    </service>


    <receiver
        android:name=".MyBraoadCastReciever" android:process=":my_process"
        android:enabled="true"
        android:exported="false" >
    </receiver>

Answer 1

您的 EXEC_INTERVAL 设置为 200 毫秒，而不是 20 * 1000(20 秒)。

此外，如果您使用 setRepeating，最好使用相对时间 AlarmManager.ELAPSED_REALTIME_WAKEUP(自手机启动以来的时间)，并且无需创建日历，您只需调用 SystemClock.elapsedRealtime() 或使用可选的 2 秒偏移量 SystemClock.elapsedRealtime() + 2000。

所以你的重复集应该是这样的:

alarmManager.setRepeating(AlarmManager.ELAPSED_REALTIME_WAKEUP,
                SystemClock.elapsedRealtime() + 2000, EXEC_INTERVAL, intentExecuted);