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/** 
 * 跟网络相关的工具类 
 *  
 *  
 *  
 */ 
public class NetUtils  
{  
    private NetUtils()  
    {  
        /* cannot be instantiated */ 
        throw new UnsupportedOperationException("cannot be instantiated");  
    }  
   
    /** 
     * 判断网络是否连接 
     *  
     * @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;  
    }  
   
    /** 
     * 判断是否是wifi连接 
     */ 
    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;  
   
    }  
   
    /** 
     * 打开网络设置界面 
     */ 
    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);  
    }  
   
}