android 公开静态内部类BroadcastReceiver

android 公开静态内部类BroadcastReceiver

第一次写博客，写得不好盼大家指正.

      当想实现广播接收功能时，因java  是单继承，所以一般一个类都会extends Activity，所以会想到内部类来extends BroadcastReceiver,这中间可能会出现两种异常

1:java.lang.RuntimeException: Unable to instantiate      receiver com.example.progressbar.ProgressBarActivity$mBroadcastReceiver:      java.lang.InstantiationException: com.example.progressbar.ProgressBarActivity$mBroadcastReceiver

      这是因为内部类需要写成静态的，即static

static class mBroadcastReceiver extends BroadcastReceiver {//必须为静态公开的(public static)@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stub}}

2: java.lang.RuntimeException: Unable to instantiate     receiver com.example.progressbar.ProgressBarActivity$mBroadcastReceiver:     java.lang.IllegalAccessException: access to class not allowed

public static  class mBroadcastReceiver extends BroadcastReceiver { //必须为静态公开的(public static)@Overridepublic void onReceive(Context context, Intent intent) {// TODO Auto-generated method stub}}

    这是因为需要将此类写成public ，若没写默认为protected的，则会出现access to class not allowed

正确的为：

内部类需要加上$

<receiver android:name="com.example.progressbar.ProgressBarActivity$mBroadcastReceiver" >            <intent-filter>                <action android:name="com.example.progressbar.ProgressBarActivity.mBroadcastReceiver" />            </intent-filter>        </receiver>

      当然还有另一种方法即实现其一个实例

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {@Overridepublic void onReceive(Context context, Intent intent) {        }};

然后就是注册和注销

在onCreate（） 或onResume（）中调用registerBoradcastReceiver()

public void registerBoradcastReceiver() {IntentFilter myIntentFilter = new IntentFilter();myIntentFilter.addAction(ACTION_NAME);// 注册广播registerReceiver(mBroadcastReceiver, myIntentFilter);}@Overridepublic void onDestroy() {super.onDestroy();unregisterReceiver(mBroadcastReceiver);}