动态注册BroadcastReceiver-未注册接收器

Question

I've a problem with dynamically registering BroacasrReceiver CallReceiver . When onReceive method of CallReceiver is trigerred the fatal exception is thrown.

...
private boolean isCRRegistered = false;

public int onStartCommand (Intent intent, int flags, int startId) {

     if(!isCRRegistered)    {
     IntentFilter filter2 = new IntentFilter("android.intent.action.PHONE_STATE");
     CallReceiver mCallReceiver = new CallReceiver();
     registerReceiver(mCallReceiver, filter2);

     //registering some listener
     mCallReceiver.registerListener(this);
     }
}

unregistering:

if(isCRRegistered)  {
        unregisterReceiver (mCallReceiver);
}

logcat:

02-04 14:41:50.286: E/AndroidRuntime(28328): FATAL EXCEPTION: main
02-04 14:41:50.286: E/AndroidRuntime(28328): java.lang.RuntimeException: Error receiving broadcast Intent { act=android.intent.action.PHONE_STATE flg=0x20000000 (has extras) } in com.kris.intellignetringer.CallReceiver@448162b8
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.app.ActivityThread$PackageInfo$ReceiverDispatcher$Args.run(ActivityThread.java:934)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.os.Handler.handleCallback(Handler.java:587)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.os.Handler.dispatchMessage(Handler.java:92)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.os.Looper.loop(Looper.java:143)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.app.ActivityThread.main(ActivityThread.java:4914)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at java.lang.reflect.Method.invokeNative(Native Method)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at java.lang.reflect.Method.invoke(Method.java:521)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at dalvik.system.NativeStart.main(Native Method)
02-04 14:41:50.286: E/AndroidRuntime(28328): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.kris.intellignetringer.ScreenReceiver@44816d60
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.app.ActivityThread$PackageInfo.forgetReceiverDispatcher(ActivityThread.java:812)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:822)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:331)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at com.kris.intellignetringer.StateChecker.serviceDestroy(StateChecker.java:126)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at com.kris.intellignetringer.StateChecker.onPhoneStateChange(StateChecker.java:36)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at com.kris.intellignetringer.CallReceiver.onReceive(CallReceiver.java:50)
02-04 14:41:50.286: E/AndroidRuntime(28328):    at  android.app.ActivityThread$PackageInfo$ReceiverDispatcher$Args.run(ActivityThread.java:917)
02-04 14:41:50.286: E/AndroidRuntime(28328):    ... 9 more

Answer 1

The error is not here! The error is when you are unregistering the receiver. It seems you are conditionally registering the receiver.

Therefore, before unregistering the receiver, make sure that you have really registered it.

You can make use of a boolean that is set once you register the receiver. Then when you want to unregister the receiver, you make sure that the boolean is set otherwise(if it is not(false)) you do not unregister.