我想解析包含字符串和圖像的JSON對象。我的代碼正在工作，但它加載圖像太慢。我想加載另一個asynctask或服務(wù)的圖像，以減少加載時間。我怎樣才能做到這一點？哪一個是最好的方法使用asynctask或服務(wù)？這里是我的代碼JSON解析并獲取android中的圖像

public class Traffic extends Fragment {

private ListView listView;

private HttpURLConnection connection = null;

private BufferedReader bufferedReader = null;

private InputStream inputStream = null;

private ArrayList trafficList;

private TrafficAdapter trafficAdapter;

private View view;

private ProgressDialog progressDialog;

@Nullable

@Override

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

view = inflater.inflate(R.layout.traffic,container,false);

listView = (ListView) view.findViewById(R.id.trafficListView);

progressDialog = ProgressDialog.show(view.getContext(),"" ,"Wait..." , true);

new GetTrafficNews().execute();

trafficList = new ArrayList();

trafficAdapter = new TrafficAdapter(view.getContext() , R.id.trafficListView , trafficList);

listView.setAdapter(trafficAdapter);

return view;

}

public class GetTrafficNews extends AsyncTask {

@Override

protected String doInBackground(String... params) {

try {

URL url = new URL("http://www.dtexeshop.com/Journalist/GetTrafficNews.php");

connection = (HttpURLConnection) url.openConnection();

connection.setRequestMethod("POST");

connection.setDoInput(true);

inputStream = connection.getInputStream();

bufferedReader = new BufferedReader(new InputStreamReader(inputStream, "iso-8859-1"));

StringBuffer stringBuffer = new StringBuffer();

String line="";

while((line=bufferedReader.readLine()) != null){

stringBuffer.append(line);

}

String finalJson = stringBuffer.toString();

JSONObject parentJson = new JSONObject(finalJson);

JSONArray parentJsonArray = parentJson.getJSONArray("traffic");

for (int i = 0; i < parentJsonArray.length(); i++) {

JSONObject finalJsonObject = parentJsonArray.getJSONObject(i);

TrafficModelClass modelClass = new TrafficModelClass();

modelClass.setUserName(finalJsonObject.getString("UserName"));

modelClass.setDateTime(finalJsonObject.getString("DateTime"));

modelClass.setHeadline(finalJsonObject.getString("Headline"));

String string_url ="http://www.dtexeshop.com/Journalist/images/"+ finalJsonObject.getString("ImageName");

URL urlImage = new URL(string_url);

Bitmap image = BitmapFactory.decodeStream(urlImage.openConnection().getInputStream());

modelClass.setBitmapImage(image);

modelClass.setDescription(finalJsonObject.getString("Description"));

trafficList.add(modelClass);

if(i==1){

progressDialog.dismiss();

}

}

inputStream.close();

} catch (MalformedURLException e) {

e.printStackTrace();

} catch (ProtocolException e) {

e.printStackTrace();

} catch (IOException e) {

e.printStackTrace();

} catch (JSONException e) {

e.printStackTrace();

}finally {

if (connection != null) {

connection.disconnect();

}

if (bufferedReader != null) {

try {

bufferedReader.close();

} catch (IOException e) {

e.printStackTrace();

}

}

}

return null;

}

@Override

protected void onPreExecute() {

super.onPreExecute();

}

@Override

protected void onPostExecute(String s) {

trafficAdapter.notifyDataSetChanged();

progressDialog.dismiss();

}

}

}

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