Android开发中可能被忽视的bug

java.lang.IllegalArgumentException

  • 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

    1. 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

    1. 文件路径:android.app.ReceiverRestrictedContext.java
    @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
做者:奔跑的平头哥 连接:https://www.jianshu.com/p/e98735bda717 来源:简书 简书著做权归做者全部,任何形式的转载都请联系做者得到受权并注明出处。
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