在onReceive中取消注册Android Broadcast Receiver会抛出“未注册Receiver". [英] Unregistering Android Broadcast Receiver in onReceive throws "Receiver not registered"

问题描述

我有一个BroadcastReceiver可供使用.

我正在一个活动中注册它.我不能将unregisterReceiver()放在onPause中，因为即使活动被暂停或破坏，它也必须保持运行.

I'm registering it in an Activity. I can't put the unregisterReceiver() in onPause because it has to stay running even when the activity is paused or destroyed.

我希望BroadcastReceiver完成后自行注销，就像这样:

I want the BroadcastReceiver to unregister itself when it is done, something like this:

public class SmsReceiver extends BroadcastReceiver {

    public void onReceive(Context context, Intent intent) {
           // do some code..
           context.unregisterReceiver(this)
        }
}

但是会导致异常:Receiver not registered.

推荐答案

BroadcastReceiver仅在执行其onReceive()方法期间存在.因此，每次发射/接收广播时， this 都会评估为抛出的实例.请参见广播接收器生命周期.为了动态注册/注销BroadcastReceiver，您必须记住onPause()中的接收者实例，以便在onResume()期间再次注册它.

A BroadcastReceiver only exists during the execution of its onReceive() method. So, this evaluates to a throw-away instance every time the broadcast is fired/received. See Broadcast Receiver Lifecycle. For dynamically registering/unregistering of BroadcastReceivers, you have to remember the instance of your receiver in onPause() to register it again during onResume().

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