<receiver 
  android:enabled=["true" | "false"]
//此broadcastReceiver能否接收其他App的發(fā)出的廣播
//默認值是由receiver中有無intent-filter決定的：如果有intent-filter，默認值為true，否則為false
  android:exported=["true" | "false"]
  android:icon="drawable resource"
  android:label="string resource"
//繼承BroadcastReceiver子類的類名
  android:name=".mBroadcastReceiver"
//具有相應權限的廣播發(fā)送者發(fā)送的廣播才能被此BroadcastReceiver所接收；
  android:permission="string"
//BroadcastReceiver運行所處的進程
//默認為app的進程，可以指定獨立的進程
//注：Android四大基本組件都可以通過此屬性指定自己的獨立進程
  android:process="string" >

//用于指定此廣播接收器將接收的廣播類型
//本示例中給出的是用于接收網(wǎng)絡狀態(tài)改變時發(fā)出的廣播
 <intent-filter>
<action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
  </intent-filter>
</receiver>

<receiver 
  //此廣播接收者類是mBroadcastReceiver
  android:name=".mBroadcastReceiver" >
  //用于接收網(wǎng)絡狀態(tài)改變時發(fā)出的廣播
  <intent-filter>
    <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
  </intent-filter>
</receiver>

@Override
 protected void onResume(){
   super.onResume();

  //實例化BroadcastReceiver子類 & IntentFilter
   mBroadcastReceiver mBroadcastReceiver = new mBroadcastReceiver();
   IntentFilter intentFilter = new IntentFilter();

  //設置接收廣播的類型
   intentFilter.addAction(android.net.conn.CONNECTIVITY_CHANGE);

  //調(diào)用Context的registerReceiver（）方法進行動態(tài)注冊
   registerReceiver(mBroadcastReceiver, intentFilter);
 }


//注冊廣播后，要在相應位置記得銷毀廣播
//即在onPause() 中unregisterReceiver(mBroadcastReceiver)
//當此Activity實例化時，會動態(tài)將MyBroadcastReceiver注冊到系統(tǒng)中
//當此Activity銷毀時，動態(tài)注冊的MyBroadcastReceiver將不再接收到相應的廣播。
 @Override
 protected void onPause() {
   super.onPause();
   //銷毀在onResume()方法中的廣播
   unregisterReceiver(mBroadcastReceiver);
   }
}