Question

从Android应用程序调用webservice时，我有两到三次执行。当我从2.3.3（仿真器）版本的应用程序调用web服务时，我得到异常，如UnhostException，4.2.2（真实设备）版本上的connectiontimeoutexception和3.1版本的正常工作，我不知道为什么会发生这种情况。我试图从昨天开始解决这个异常但是已经解决，如果代码中需要进行任何更改，那么请建议我。

在 LoginActivity 中，我调用了发出http请求的方法

List<NameValuePair> params = new ArrayList<NameValuePair>();
    params.add(new BasicNameValuePair("tag", login_tag));
    params.add(new BasicNameValuePair("email", username));
    params.add(new BasicNameValuePair("password", userpsw));
    JsonParserWebs jsonDataFromSrvr = new JsonParserWebs();
    String loginData = jsonDataFromSrvr.makeHttpReqToSrvr(loginUrl,"POST", params);

以下是用于调用webservice的 JsonParserWebs

public String makeHttpReqToSrvr(String url,String requestType,List<NameValuePair> params) {
Log.i(JsonParserWebs.class.getName(),"URL..."+url);
HttpEntity httpEntity=null;

//making http request
try {

    if (requestType == "GET") {

        //connection time out
        HttpParams httpParameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
        HttpConnectionParams.setSoTimeout(httpParameters, 10000);

        HttpClient httpClient = new DefaultHttpClient(httpParameters);
        String paramString =URLEncodedUtils.format(params, "utf-8");
        HttpGet httpGet = new HttpGet(url+"?"+paramString);



        HttpResponse httpResp = httpClient.execute(httpGet);
        httpEntity = httpResp.getEntity();

    }
    if (requestType == "POST") {

        //connection time out
        // From stackoverflow, I addes following three line but still got ConnectTimeoutException
        HttpParams httpParameters = new BasicHttpParams();
        HttpConnectionParams.setConnectionTimeout(httpParameters, 5000);
        HttpConnectionParams.setSoTimeout(httpParameters, 10000);

        HttpClient  httpClient = new DefaultHttpClient(httpParameters);
        HttpPost httpPost = new HttpPost(url);
        httpPost.setEntity(new UrlEncodedFormEntity(params));

        HttpResponse httpResp = httpClient.execute(httpPost);
        httpEntity = httpResp.getEntity();

    }

} catch (UnsupportedEncodingException e) {
    e.printStackTrace();
} catch (ClientProtocolException e) {
    e.printStackTrace();
} catch (IOException e) {
    e.printStackTrace();
}

try {

    json = EntityUtils.toString(httpEntity);
    Log.v("JSON", "data"+json);
} catch (Exception e) {
    e.printStackTrace();
} 
// try parse the string to a JSON object

return json;

}

先谢谢

Answer 1

您需要使用AsyncTask，否则会崩溃！

Answer 2

1。使用AsyncTask时，如果您使用耗时的过程，则会出现网络异常 2。在.mainfeast

中获取互联网权限

在android中调用webservice时遇到异常？

2 个答案: