这是我的代码到目前为止，我根据我在stackoverflow上找到的很多帖子进行了更改，但是我似乎无法使其正常工作，它运行正常，但有时它会停留在进度上吧，它一直在旋转，直到应用程序崩溃，我试图设置超时，以便如果连接不成功，它将停止而不是让应用程序崩溃。
我不确定我是否正确使用HttpConnectionParams.setSoTimeout和HttpConnectionParams.setConnectionTimeout，
这是JSON代码
public JSONObject makeHttpRequest(String url, String method,List<NameValuePair> params)
{
try
{
HttpParams httpParameters = new BasicHttpParams();
HttpConnectionParams.setSoTimeout(httpParameters, 4000);
HttpConnectionParams.setConnectionTimeout(httpParameters, 4000);
if(method.equals("POST"))
{
HttpClient httpClient = new DefaultHttpClient(httpParameters);
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params,"utf-8"));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity != null)
{
is = httpEntity.getContent();
if(is != null)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
json = sb.toString();
jObj = new JSONObject(json);
}
}
}
else if(method.equals("GET"))
{
HttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
if (httpEntity != null)
{
is = httpEntity.getContent();
if(is != null)
{
BufferedReader reader = new BufferedReader(new InputStreamReader(is, "utf-8"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null)
{
sb.append(line + "\n");
}
is.close();
json = sb.toString();
jObj = new JSONObject(json);
}
}
}
}
catch (ConnectTimeoutException e)
{
//Here Connection TimeOut excepion
Log.e("connection error time OUT", "ok");
}
catch (UnsupportedEncodingException e)
{
e.printStackTrace();
} catch (ClientProtocolException e)
{
e.printStackTrace();
} catch (IOException e)
{
e.printStackTrace();
}
catch (Exception e)
{
Log.e("Buffer Error", "error converting result " + e.toString());
}
return jObj;
}
这是AsyncTask从php页面加载项目。
class GetSpecialOffers extends AsyncTask<String, String, String> {
@Override
protected void onPreExecute() {
super.onPreExecute();
pDialog = new ProgressDialog(getActivity());
pDialog.setMessage("loading items, please wait...");
pDialog.setIndeterminate(false);
pDialog.setCancelable(false);
pDialog.show();
}
@Override
protected String doInBackground(String... args) {
List<NameValuePair> params = new ArrayList<NameValuePair>();
try
{
int success=0;
JSONObject json = jParser.makeHttpRequest(url_items, "GET",params);
if(json != null)
{
success = json.getInt(TAG_SUCCESS);
}
if (success == 1)
{
successValue = 1;
items = json.getJSONArray(TAG_SPECIAL_ITEM);
for (int i = 0; i < items.length(); i++)
{
JSONObject c = items.getJSONObject(i);
specialid = c.getString(TAG_SPECIAL_ID);
specialname = c.getString(TAG_SPECIAL_NAME);
specialprice = c.getString(TAG_SPECIAL_PRICE);
specialimage = c.getString(TAG_SPECIAL_IMAGE);
specialdate = c.getString(TAG_SPECIAL_DATE);
HashMap<String, String> map = new HashMap<String, String>();
map.put(TAG_SPECIAL_ID, specialid);
map.put(TAG_SPECIAL_NAME, specialname);
map.put(TAG_SPECIAL_PRICE, specialprice);
map.put(TAG_SPECIAL_IMAGE, specialimage);
map.put(TAG_SPECIAL_DATE, specialdate);
SpecialList.add(map);
}
}
else
{
successValue = 0;
}
}
catch (JSONException e)
{
e.printStackTrace();
}
return null;
}
protected void onPostExecute(String file_url)
{
pDialog.cancel();
if (successValue==1)
{
adapter = new SpecialAdapter(getActivity(), SpecialList);
lVSpecial.setAdapter(adapter);
}
else
{
NoSpecialOffersFound();
}
}
}
答案 0 :(得分：0)
使用此代码，这对我有用。
<强> JSONParser.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.util.List;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.client.utils.URLEncodedUtils;
import org.apache.http.impl.client.DefaultHttpClient;
import org.json.JSONException;
import org.json.JSONObject;
import android.util.Log;
public class JSONParser {
static InputStream is = null;
static JSONObject jObj = null;
static String json = "";
// constructor
public JSONParser() {
}
// function get json from url
// by making HTTP POST or GET mehtod
public JSONObject makeHttpRequest(String url, String method,
List<NameValuePair> params) {
// Making HTTP request
try {
// check for request method
if(method == "POST"){
// request method is POST
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpPost httpPost = new HttpPost(url);
httpPost.setEntity(new UrlEncodedFormEntity(params));
HttpResponse httpResponse = httpClient.execute(httpPost);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}else if(method == "GET"){
// request method is GET
DefaultHttpClient httpClient = new DefaultHttpClient();
String paramString = URLEncodedUtils.format(params, "utf-8");
url += "?" + paramString;
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
HttpEntity httpEntity = httpResponse.getEntity();
is = httpEntity.getContent();
}
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
} catch (ClientProtocolException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
try {
BufferedReader reader = new BufferedReader(new InputStreamReader(
is, "iso-8859-1"), 8);
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
sb.append(line + "\n");
}
is.close();
json = sb.toString();
} catch (Exception e) {
Log.e("Buffer Error", "Error converting result " + e.toString());
}
// try parse the string to a JSON object
try {
jObj = new JSONObject(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}