【轉】關於NetworkInfo對象的isConnected()與isAvailable()

本文轉自 http://blog.csdn.net/santicom/article/details/6932421

測試類如下：

public class MainActivity extends Activity
{
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        this.registerReceiver(mBroadcastReceiver, new IntentFilter(
                ConnectivityManager.CONNECTIVITY_ACTION));
    }

    private BroadcastReceiver mBroadcastReceiver = new BroadcastReceiver()
    {
        @Override
        public void onReceive(Context context, Intent intent)
        {
            Bundle bundle = intent.getExtras();
            NetworkInfo aNetworkInfo = (NetworkInfo) bundle
                    .get(ConnectivityManager.EXTRA_NETWORK_INFO);

            if (aNetworkInfo.isConnected())
            {
                System.out.println("connecte");
            } else
            {
                System.out.println("not connect");
            }

            if (aNetworkInfo.isAvailable())
            {
                System.out.println("available");
            } else
            {
                System.out.println("not available");
            }
            System.out.println("--------------------");
        }
    };
}

總結有以下5種狀態：

在WLAN設置界面

1，顯示連接已保存，但標題欄沒有，即沒有實質連接上，輸出為：not connect， available

2，顯示連接已保存，標題欄也有已連接上的圖標，            輸出為：connect， available

3，選擇不保存后                                                                        輸出為：not connect， available

4，選擇連接，在正在獲取IP地址時                                        輸出為：not connect， not available

5，連接上后                                                                                輸出為：connect， available