Android 監聽網絡連接狀態的改變

Android 監聽網絡連接狀態的改變：

BroadcastReceiver

1. public class MyReceiver extends BroadcastReceiver {
2. @Override
3. public void onReceive(Context context, Intent intent) {
4. // TODO Auto-generated method stub
5. //Toast.makeText(context, intent.getAction(), 1).show();
6. ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
7. NetworkInfo mobileInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);
8. NetworkInfo wifiInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);
9. NetworkInfo activeInfo = manager.getActiveNetworkInfo();
10. Toast.makeText(context, "mobile:"+mobileInfo.isConnected()+"\n"+"wifi:"+wifiInfo.isConnected()
11. +"\n"+"active:"+activeInfo.getTypeName(), 1).show();
12. } //如果無網絡連接activeInfo為null
14. }

在清單文件中注冊 BroadcastReceiver

1. <receiver android:name=".MyReceiver">
2. <intent-filter>
3. <action android:name="android.net.conn.CONNECTIVITY_CHANGE"/>
4. </intent-filter>
5. </receiver>

要讀取網絡狀態記得要加權限

1. <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>

更多Android相關信息見Android 專題頁面 http://www.linuxidc.com/topicnews.aspx?tid=11