1 /*
2  * Copyright (C) 2011 The Android Open Source Project
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  *      http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 
17 package com.android.volley.toolbox;
18 
19 import com.android.volley.NetworkResponse;
20 import com.android.volley.Request;
21 import com.android.volley.Response;
22 import com.android.volley.Response.ErrorListener;
23 import com.android.volley.Response.Listener;
24 
25 import java.io.UnsupportedEncodingException;
26 
27 /**
28  * A canned request for retrieving the response body at a given URL as a String.
29  */
30 public class StringRequest extends Request<String> {
31     private final Listener<String> mListener;
32 
33     /**
34      * Creates a new request with the given method.
35      *
36      * @param method the request {@link Method} to use
37      * @param url URL to fetch the string at
38      * @param listener Listener to receive the String response
39      * @param errorListener Error listener, or null to ignore errors
40      */
StringRequest(int method, String url, Listener<String> listener, ErrorListener errorListener)41     public StringRequest(int method, String url, Listener<String> listener,
42             ErrorListener errorListener) {
43         super(method, url, errorListener);
44         mListener = listener;
45     }
46 
47     /**
48      * Creates a new GET request.
49      *
50      * @param url URL to fetch the string at
51      * @param listener Listener to receive the String response
52      * @param errorListener Error listener, or null to ignore errors
53      */
StringRequest(String url, Listener<String> listener, ErrorListener errorListener)54     public StringRequest(String url, Listener<String> listener, ErrorListener errorListener) {
55         this(Method.GET, url, listener, errorListener);
56     }
57 
58     @Override
deliverResponse(String response)59     protected void deliverResponse(String response) {
60         mListener.onResponse(response);
61     }
62 
63     @Override
parseNetworkResponse(NetworkResponse response)64     protected Response<String> parseNetworkResponse(NetworkResponse response) {
65         String parsed;
66         try {
67             parsed = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
68         } catch (UnsupportedEncodingException e) {
69             parsed = new String(response.data);
70         }
71         return Response.success(parsed, HttpHeaderParser.parseCacheHeaders(response));
72     }
73 }
74