Android系統下檢測Wifi連接互聯網是否正常的代碼

/*
 


判斷網絡狀態是否可用
*
@return true: 網絡可用 ; false: 網絡不可用
*/

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;
}
/ 檢查網絡聯機是否正常 /
public boolean checkInternetConnection(String strURL, String strEncoding)
{
    / 最多延時n秒若無響應則表示無法聯機 /
    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;
}

}
/ 自定義BIG5轉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;
}
/ 自定義UTF-8轉BIG5 /
public String unicode2big5(String strUTF8)
{
    String strReturn = "";
    try
    {
        strReturn = new String(strUTF8.getBytes("UTF-8"), "big5");
    }
    catch (Exception e)
    {
        e.printStackTrace();
    }
    return strReturn;
}</pre>