异常:Receiver not registeredjava
出现状况:偶现android
问题缘由:广播在没有注册的状况下就调用注销广播方法。bash
问题场景:平时大多动态注册广播,都是把广播注册写在Activity的onCreate方法里面,把注销写在onDestory里面,这样能够保证调用广播注销方法时,该广播必定是被注册过的,可是在其它地方使用,可能因为代码逻辑不够严谨,而出现注销时,广播并无被注册。app
问题衍生:ide
若是屡次调用注销广播也是会报异常的:spa
"Unregistering Receiver " + r+ " that was already unregistered"
复制代码
源码位置:code
@Override
public void unregisterReceiver(BroadcastReceiver receiver) {
if (mPackageInfo != null) {
IIntentReceiver rd = mPackageInfo.forgetReceiverDispatcher(
getOuterContext(), receiver);
try {
ActivityManager.getService().unregisterReceiver(rd);
} catch (RemoteException e) {
throw e.rethrowFromSystemServer();
}
} else {
throw new RuntimeException("Not supported in system context");
}
public IIntentReceiver forgetReceiverDispatcher(Context context, BroadcastReceiver r) {
...
if (context == null) {
throw new IllegalStateException("Unbinding Receiver " + r
+ " from Context that is no longer in use: " + context);
} else {
throw new IllegalArgumentException("Receiver not registered: " + r);
}
}
} ```复制代码