Android 判斷網絡狀態

Android手機同時支持WIFI和3G, 判斷網絡連接, 判斷網絡類型(WIFI或3G).

權限:

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

   /**


 * 判斷網絡是否可用, 在使用網絡請求是預先使用此方法進行檢查, 以節省資源.
 *
 * @return 可用狀態
 */
public static boolean isNetAvailable() {
    Context context = App.getAppContext();
    ConnectivityManager manager = (ConnectivityManager)
         context.getSystemService(Context.CONNECTIVITY_SERVICE);
    NetworkInfo info = manager.getActiveNetworkInfo();
    return (info != null && info.isAvailable() && info.isConnected());
}</pre><br />

判斷網絡類型 
ConnectivityManager conMan = (ConnectivityManager) 
    context.getSystemService(Context.CONNECTIVITY_SERVICE);

// 3G
State mobile = conMan.getNetworkInfo(0).getState();
// WIFI
State wifi = conMan.getNetworkInfo(1).getState();
if (mobile == NetworkInfo.State.CONNECTED 
    || mobile == NetworkInfo.State.CONNECTING) {
    // TODO: in mobile do something
} else if (wifi == NetworkInfo.State.CONNECTED 
            || wifi == NetworkInfo.State.CONNECTING) {
    // TODO: in wifi do something
}</pre>

更加精細的網絡類型: 

TelephonyManager#getNetworkType or NetworkInfo#getSubtypeName



來自：http://blog.csdn.net/caroline_wendy/article/details/48468495