【转】关于NetworkInfo对象的isConnected()与isAvailable()

本文转自 http://blog.csdn.net/santicom/article/details/6932421

测试类如下：

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("--------------------");
        }
    };
}

总结有以下5种状态：

在WLAN设置界面

1，显示连接已保存，但标题栏没有，即没有实质连接上，输出为：not connect， available

2，显示连接已保存，标题栏也有已连接上的图标，            输出为：connect， available

3，选择不保存后                                                                        输出为：not connect， available

4，选择连接，在正在获取IP地址时                                        输出为：not connect， not available

5，连接上后                                                                                输出为：connect， available