检查网络类型

/**
 * 获取ConnectivityManager
*/
public static ConnectivityManager getConnManager(Context context) {
    return (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);
}

public static NetType getConnectedType(Context context) {
        NetworkInfo net = getConnManager(context).getActiveNetworkInfo();
        if (net != null) {
            switch (net.getType()) {
                case ConnectivityManager.TYPE_WIFI :
                    return NetType.Wifi;
                case ConnectivityManager.TYPE_MOBILE :
                    return NetType.Mobile;
                default :
                    return NetType.Other;
            }
        }
        return NetType.None;
    }