Receiver not registered.

1. 在MessageListActivity中出現異常：Receiver not registered.

07-16 11:15:47.881: E/AndroidRuntime(32361): FATAL EXCEPTION: main
07-16 11:15:47.881: E/AndroidRuntime(32361): java.lang.RuntimeException: Unable to destroy activity {com.txrj.sms/com.txrj.sms.activity.MessageListActivity}: java.lang.IllegalArgumentException: Receiver not registered: com.txrj.sms.activity.MessageListActivity$6@41dd73f0
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3129)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread.handleDestroyActivity(ActivityThread.java:3147)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread.access$1200(ActivityThread.java:128)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1194)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.os.Handler.dispatchMessage(Handler.java:99)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.os.Looper.loop(Looper.java:137)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread.main(ActivityThread.java:4517)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at java.lang.reflect.Method.invokeNative(Native Method)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at java.lang.reflect.Method.invoke(Method.java:511)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at dalvik.system.NativeStart.main(Native Method)
07-16 11:15:47.881: E/AndroidRuntime(32361): Caused by: java.lang.IllegalArgumentException: Receiver not registered: com.txrj.sms.activity.MessageListActivity$6@41dd73f0
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.LoadedApk.forgetReceiverDispatcher(LoadedApk.java:628)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ContextImpl.unregisterReceiver(ContextImpl.java:1190)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.content.ContextWrapper.unregisterReceiver(ContextWrapper.java:361)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at com.txrj.sms.activity.MessageListActivity.onDestroy(MessageListActivity.java:327)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.Activity.performDestroy(Activity.java:4634)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.Instrumentation.callActivityOnDestroy(Instrumentation.java:1083)
07-16 11:15:47.881: E/AndroidRuntime(32361):     at android.app.ActivityThread.performDestroyActivity(ActivityThread.java:3116)
07-16 11:15:47.881: E/AndroidRuntime(32361):     ... 11 more

2. 查看BroadcastReceiver API文檔，了解到廣播的onReceive方法執行完，然后廣播就不再處於active狀態了。所以當發出信息成功之后，通過Toast.makeText彈出提示告知用戶，然后onReceive方法結束，廣播的生命周期就結束了。從中還了解到onReceive方法中可以執行Toast.makeText()表現了廣播的onReceive方法是在主線程中執行的，否則就無法執行Toast.makeText方法了。

private void createAndRegisterDeliveryIntent() {
    deliveryReceiver = new BroadcastReceiver(){

        @Override
        public void onReceive(Context context, Intent intent) {
            mContext.unregisterReceiver(this);
           Toast.makeText(context, "message arrived.", Toast.LENGTH_SHORT).show();
        }
    };
    IntentFilter filter = new IntentFilter(TxrjConstant.ACTION_DELIVERY_SMS);
    mContext.registerReceiver(deliveryReceiver, filter);
}

3. 查看上面的代碼片段紅色部分。這條語句不應該出現。因為在Activity的onDestroy()方法中調用了注銷方法。