BroadcastReceiver的VS WakefulBroadcastReceiver

问题描述

有人可以解释我在breify，是什么的BroadcastReceiver和WakefulBroadcastReceiver之间准确的区别。

can Somebody explain me in breify, what is the exact difference between BroadcastReceiver and WakefulBroadcastReceiver.

在这情况下，我们一定要到这个接收器。

In which situation we have to go to this receivers.

推荐答案

之间存在的BroadcastReceiver 和 WakefulBroadcastReceiver 。

当您收到内部的onReceive广播（）方法

假设，

的BroadcastReceiver

• 是不保证是 CPU会保持清醒如果您启动一些长时间运行的进程。 CPU可立即回到入睡。

• It is not guaranteed that CPU will stay awake if you initiate some long running process. CPU may go immediately back to sleep.

WakefulBroadcastReceiver

• 是保障是 CPU会保持清醒，直到你火 completeWakefulIntent 。

• It is guaranteed that CPU will stay awake until you fire completeWakefulIntent.

例如：

在这里，当你接收广播，你开始一个服务，因为你正在使用 WakefulBroadcastReceiver ，将持有 wakelock ，不会让CPU睡眠直到完成内部供水和消防工作的 completeWakefulIntent

Here, when you receive broadcast, you are starting a service, as you are using WakefulBroadcastReceiver, it will hold wakelock and won't let the CPU sleep until you finish the work inside service and fire completeWakefulIntent

code：

    public class SimpleWakefulReceiver extends WakefulBroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        // This is the Intent to deliver to our service.
        Intent service = new Intent(context, SimpleWakefulService.class);

        // Start the service, keeping the device awake while it is launching.
        Log.i("SimpleWakefulReceiver", "Starting service @ " + SystemClock.elapsedRealtime());
        startWakefulService(context, service);
    }
}

    public class SimpleWakefulService extends IntentService {
    public SimpleWakefulService() {
        super("SimpleWakefulService");
    }

    @Override
    protected void onHandleIntent(Intent intent) {
        // At this point SimpleWakefulReceiver is still holding a wake lock
        // for us.  We can do whatever we need to here and then tell it that
        // it can release the wakelock.  This sample just does some slow work,
        // but more complicated implementations could take their own wake
        // lock here before releasing the receiver's.
        //
        // Note that when using this approach you should be aware that if your
        // service gets killed and restarted while in the middle of such work
        // (so the Intent gets re-delivered to perform the work again), it will
        // at that point no longer be holding a wake lock since we are depending
        // on SimpleWakefulReceiver to that for us.  If this is a concern, you can
        // acquire a separate wake lock here.
        for (int i=0; i<5; i++) {
            Log.i("SimpleWakefulReceiver", "Running service " + (i+1)
                    + "/5 @ " + SystemClock.elapsedRealtime());
            try {
                Thread.sleep(5000);
            } catch (InterruptedException e) {
            }
        }
        Log.i("SimpleWakefulReceiver", "Completed service @ " + SystemClock.elapsedRealtime());
        SimpleWakefulReceiver.completeWakefulIntent(intent);
    }
}

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