Question

我正在服务，实际上我想要的是每分钟调用一些事件，假设我想在每分钟打印日志，我做了什么代码工作正常但只有当活动在前台时，我是最小化应用程序或关闭它，它会给出如下错误：

08-19 17:31:33.936: E/AndroidRuntime(14264): FATAL EXCEPTION: main
08-19 17:31:33.936: E/AndroidRuntime(14264): java.lang.RuntimeException: Unable to stop activity    {com.example/com.example.MainActivity}: java.lang.IllegalArgumentException: Receiver not registered:   com.example.MainActivity$1@41117730
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3629)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread.handleStopActivity(ActivityThread.java:3675)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread.access$900(ActivityThread.java:162)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1393)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.os.Looper.loop(Looper.java:158)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread.main(ActivityThread.java:5751)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at java.lang.reflect.Method.invokeNative(Native Method)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at java.lang.reflect.Method.invoke(Method.java:511)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1083)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:850)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at dalvik.system.NativeStart.main(Native Method)
08-19 17:31:33.936: E/AndroidRuntime(14264): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.example.MainActivity$1@41117730
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:719)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1620)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:445)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at com.example.MainActivity.onStop(MainActivity.java:143)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.Instrumentation.callActivityOnStop(Instrumentation.java:1305)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.Activity.performStop(Activity.java:5338)
08-19 17:31:33.936: E/AndroidRuntime(14264):    at android.app.ActivityThread.performStopActivityInner(ActivityThread.java:3626)
08-19 17:31:33.936: E/AndroidRuntime(14264):    ... 11 more

我的活动代码如下：

public class MainActivity extends Activity 
{


BroadcastReceiver mBroadcastTime;

@Override
public void onCreate(Bundle savedInstanceState) 
{

super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);


mBroadcastTime = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        Intent service1 = new Intent(context, MyAlarmService.class);
        context.startService(service1);
    }

};

IntentFilter mTime = new IntentFilter(Intent.ACTION_TIME_TICK);
registerReceiver(mBroadcastTime, mTime);


}

@Override
public void onPause()
{
  super.onPause();
  if(mBroadcastTime != null){
      unregisterReceiver(mBroadcastTime);
      Log.v("BROADCAST ON PAUSE", "UNREGISTERED");
  }
}

@Override
public void onStop()
{
  super.onStop();
  if(mBroadcastTime != null){
      unregisterReceiver(mBroadcastTime);
      Log.v("BROADCAST ON STOP", "UNREGISTERED");
  }
}

@Override
public void onDestroy()
{
  super.onDestroy();
  if(mBroadcastTime != null){
      unregisterReceiver(mBroadcastTime);
      Log.v("BROADCAST ON DESTROY", "UNREGISTERED");
  }
}

}

Answer 1

问题在于您尝试取消注册不止一次的广播接收器。你应该检查两件事：对象是否为null 是否已注册

请关注this question或从onStop()和onDestroy()

中删除取消注册方法

还要记住，如果你在onPause取消注册广播，你应该再次在onResume()

注册

IMO最简单的方式是：

从onStrop()和onDestroy()
将注册广播从onCreate()移至onResume()

请查看Android中的活动生命周期 - 应该了解每个Android开发人员;） - here您需要的一切

Answer 2

您在onCreate中注册接收器，并在onPause中取消注册。问题是onCreate只注册一次。因此，如果onPause被调用至少一次，那么你将无法取消注册两次。所以最好的办法是在onResume中注册接收器

取消注册Android中的BroadcastReceiver

2 个答案: