Android系统下检测Wifi连接互联网是否正常的代码

/**

 *

 * 判断网络状态是否可用

 *

 * @return true: 网络可用 ; false: 网络不可用

 */

public boolean isConnectInternet()

{

    ConnectivityManager conManager = (ConnectivityManager) test.this

            .getSystemService(Context.CONNECTIVITY_SERVICE);

    NetworkInfo networkInfo = conManager.getActiveNetworkInfo();

    if (networkInfo == null || !networkInfo.isConnected())

    {

        return false;

    }

    if (networkInfo.isConnected())

    {

        return true;

    }

    return false;

}

/* 检查网络联机是否正常 */

public boolean checkInternetConnection(String strURL, String strEncoding)

{

    /* 最多延时n秒若无响应则表示无法联机 */

    int intTimeout = 10;

    try

    {

        HttpURLConnection urlConnection = null;

        URL url = new URL(strURL);

        urlConnection = (HttpURLConnection) url.openConnection();

        urlConnection.setRequestMethod("GET");

        urlConnection.setDoOutput(true);

        urlConnection.setDoInput(true);

        urlConnection.setRequestProperty("User-Agent", "Mozilla/4.0"

                + " (compatible; MSIE 6.0; Windows 2000)");

        urlConnection.setRequestProperty("Content-type",

                "text/html; charset=" + strEncoding);

        urlConnection.setConnectTimeout(1000 * intTimeout);

        urlConnection.connect();

        if (urlConnection.getResponseCode() == 200)

        {

            return true;

        }

        else

        {

            Log.d("getResponseCode=", urlConnection.getResponseMessage());

            return false;

        }

    }

    catch (Exception e)

    {

        e.printStackTrace();

        Log.d("emessage", e.getMessage());

        return false;

    }

}

/* 自定义BIG5转UTF-8 */

public String big52unicode(String strBIG5)

{

    String strReturn = "";

    try

    {

        strReturn = new String(strBIG5.getBytes("big5"), "UTF-8");

    }

    catch (Exception e)

    {

        e.printStackTrace();

    }

    return strReturn;

}

/* 自定义UTF-8转BIG5 */

public String unicode2big5(String strUTF8)

{

    String strReturn = "";

    try

    {

        strReturn = new String(strUTF8.getBytes("UTF-8"), "big5");

    }

    catch (Exception e)

    {

        e.printStackTrace();

    }

    return strReturn;

}