當想實現廣播接收功能時，因java ?是單繼承，所以一般一個類都會extends Activity，所以會想到內部類來extends BroadcastReceiver,這中間可能會出現兩種異常

1：java.lang.RuntimeException: Unable to instantiate

receiver com.example.progressbar.ProgressBarActivity$mBroadcastReceiver:

java.lang.InstantiationException: com.example.progressbar.ProgressBarActivity$mBroadcastReceiver

這是因為內部類需要寫成靜態的，即static

static?class mBroadcastReceiver extends BroadcastReceiver {

//必須為靜態公開的(public static)

@Override

public 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

這是因為需要將此類寫成public ，若沒寫默認為protected的，則會出現access to class not allowed

正確的為：

public static?class mBroadcastReceiver extends BroadcastReceiver {

//必須為靜態公開的(public static)

@Override

public void onReceive(Context context, Intent intent) {

// TODO Auto-generated method stub

}

}

內部類需要加上$

當然還有另一種方法即實現其一個實例

private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver() {

@Override

public void onReceive(Context context, Intent intent) {

}

};

然后就是注冊和注銷

在onCreate() 或onResume()中調用registerBoradcastReceiver()

public void registerBoradcastReceiver() {

IntentFilter myIntentFilter = new IntentFilter();

myIntentFilter.addAction(ACTION_NAME);

// 注冊廣播

registerReceiver(mBroadcastReceiver, myIntentFilter);

}

@Override

public void onDestroy() {

super.onDestroy();

unregisterReceiver(mBroadcastReceiver);

}

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