Android判斷網絡狀態的工具類

public class NetUtils
{

/**
 * 判斷網絡是否連接
 * 
 * @param context
 * @return
 */
public static boolean isConnected(Context context)
{


    ConnectivityManager connectivity = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);


    if (null != connectivity)
    {


        NetworkInfo info = connectivity.getActiveNetworkInfo();
        if (null != info && info.isConnected())
        {
            if (info.getState() == NetworkInfo.State.CONNECTED)
            {
                return true;
            }
        }
    }
    return false;
}


/**
 * 判斷是否是wifi連接
 */
public static boolean isWifi(Context context)
{
    ConnectivityManager cm = (ConnectivityManager) context
            .getSystemService(Context.CONNECTIVITY_SERVICE);


    if (cm == null)
        return false;
    return cm.getActiveNetworkInfo().getType() == ConnectivityManager.TYPE_WIFI;


}


/**
 * 打開網絡設置界面
 */
public static void openSetting(Activity activity)
{
    Intent intent = new Intent("/");
    ComponentName cm = new ComponentName("com.android.settings",
            "com.android.settings.WirelessSettings");
    intent.setComponent(cm);
    intent.setAction("android.intent.action.VIEW");
    activity.startActivityForResult(intent, 0);
}

}