网络的辅助类

public class NetUtil {  
    /** * 检查当前手机网络 * * @param context * @return */  
    public static boolean checkNet(Context context)  
    {  
        // 判断连接方式 
        boolean wifiConnected = isWIFIConnected(context);  
        boolean mobileConnected = isMOBILEConnected(context);  
        if (wifiConnected == false && mobileConnected == false)  
        {  
            // 如果都没有连接返回false，提示用户当前没有网络 
            return false;  
        }  
        return true;  
    }  

    // 判断手机使用是wifi还是mobile 
    /** * 判断手机是否采用wifi连接 */  
    public static boolean isWIFIConnected(Context context)  
    {  
        // Context.CONNECTIVITY_SERVICE). 

        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_WIFI);  
        if (networkInfo != null && networkInfo.isConnected())  
        {  
            return true;  
        }  
        return false;  
    }  

    public static boolean isMOBILEConnected(Context context)  
    {  
        ConnectivityManager manager = (ConnectivityManager) context.getSystemService(Context.CONNECTIVITY_SERVICE);  
        NetworkInfo networkInfo = manager.getNetworkInfo(ConnectivityManager.TYPE_MOBILE);  
        if (networkInfo != null && networkInfo.isConnected())  
        {  
            return true;  
        }  
        return false;  
    }  
}