Android volley 使用OkHttp3.0

本文仅介绍如何使用OKHttp3.0实现HttpStack，从而接管volley的网络请求。

前言：

volley ---- Google出品的android平台轻量级网络库

     　　　  优点：扩展性强，请求队列管理

　　　　　基本介绍：http://blog.csdn.net/t12x3456/article/details/9221611/

　　　　　github镜像: https://github.com/mcxiaoke/android-volley

 

okhttp----Square出品的java网络库，android4.4以后已作为默认的HTTP连接实现

　　　　   优点：支持SPDY，连接池，传输效率的各种优化

　　　　　源码：https://github.com/square/okhttp

　　　　   官方wiki：https://github.com/square/okhttp/wiki

 

正文：

OkHttp 3.x相对于2.x，在api以及使用规范上有一些调整，所以在实现HttpStack的时候要做相应的更改，基本用法不变。

参考来源：http://blog.csdn.net/lonewolf521125/article/details/47256475

 

下面直接上代码，红色部分关注一下即可。

  1 package com.xxx.xxx;  2   3 import com.android.volley.AuthFailureError;  4 import com.android.volley.Request;  5 import com.android.volley.toolbox.HttpStack;  6   7 import org.apache.http.HttpEntity;  8 import org.apache.http.HttpResponse;  9 import org.apache.http.ProtocolVersion; 10 import org.apache.http.StatusLine; 11 import org.apache.http.entity.BasicHttpEntity; 12 import org.apache.http.message.BasicHeader; 13 import org.apache.http.message.BasicHttpResponse; 14 import org.apache.http.message.BasicStatusLine; 15  16 import java.io.IOException; 17 import java.util.Map; 18 import java.util.concurrent.TimeUnit; 19  20 import okhttp3.Call; 21 import okhttp3.Headers; 22 import okhttp3.MediaType; 23 import okhttp3.OkHttpClient; 24 import okhttp3.Protocol; 25 import okhttp3.RequestBody; 26 import okhttp3.Response; 27 import okhttp3.ResponseBody; 28  29 /** 30  * The MIT License (MIT) 31  * <p/> 32  * Copyright (c) 2015 Circle Internet Financial 33  * <p/> 34  * Permission is hereby granted, free of charge, to any person obtaining a copy 35  * of this software and associated documentation files (the "Software"), to deal 36  * in the Software without restriction, including without limitation the rights 37  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 38  * copies of the Software, and to permit persons to whom the Software is 39  * furnished to do so, subject to the following conditions: 40  * <p/> 41  * The above copyright notice and this permission notice shall be included in 42  * all copies or substantial portions of the Software. 43  * <p/> 44  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 45  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 46  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 47  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 48  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 49  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 50  * THE SOFTWARE. 51  */ 52  53 /** 54  * OkHttp backed {@link com.android.volley.toolbox.HttpStack HttpStack} that 55  * does not use okhttp-urlconnection 56  */ 57 public class OkHttpStack implements HttpStack { 58      59     private final OkHttpClient mClient; 60      61     public OkHttpStack(OkHttpClient client) { 62         this.mClient = client; 63     } 64      65     @Override 66     public HttpResponse performRequest(Request<?> request, 67             Map<String, String> additionalHeaders) throws IOException, AuthFailureError { 68          69         int timeoutMs = request.getTimeoutMs(); 70         // okhttp 3.0以后的版本构建OkHttpClient使用Builder 71         OkHttpClient.Builder builder = mClient.newBuilder(); 72         builder.connectTimeout(timeoutMs, TimeUnit.MILLISECONDS) 73                 .readTimeout(timeoutMs, TimeUnit.MILLISECONDS) 74                 .writeTimeout(timeoutMs, TimeUnit.MILLISECONDS); 75         OkHttpClient client = builder.build(); 76          77         okhttp3.Request.Builder okHttpRequestBuilder = new okhttp3.Request.Builder(); 78         okHttpRequestBuilder.url(request.getUrl()); 79          80         Map<String, String> headers = request.getHeaders(); 81         for (final String name : headers.keySet()) { 82             okHttpRequestBuilder.addHeader(name, headers.get(name)); 83         } 84         for (final String name : additionalHeaders.keySet()) { 85             // 这里用header方法，如果有重复的name，会覆盖，否则某些请求会被判定为非法 86             okHttpRequestBuilder.header(name, additionalHeaders.get(name)); 87         } 88          89         setConnectionParametersForRequest(okHttpRequestBuilder, request); 90          91         okhttp3.Request okHttpRequest = okHttpRequestBuilder.build(); 92         Call okHttpCall = client.newCall(okHttpRequest); 93         Response okHttpResponse = okHttpCall.execute(); 94          95         StatusLine responseStatus = new BasicStatusLine( 96                 parseProtocol(okHttpResponse.protocol()), okHttpResponse.code(), 97                 okHttpResponse.message()); 98         BasicHttpResponse response = new BasicHttpResponse(responseStatus); 99         response.setEntity(entityFromOkHttpResponse(okHttpResponse));100         101         Headers responseHeaders = okHttpResponse.headers();102         for (int i = 0, len = responseHeaders.size(); i < len; i++) {103             final String name = responseHeaders.name(i), value = responseHeaders.value(i);104             if (name != null) {105                 response.addHeader(new BasicHeader(name, value));106             }107         }108         109         return response;110     }111     112     private static HttpEntity entityFromOkHttpResponse(Response r) throws IOException {113         BasicHttpEntity entity = new BasicHttpEntity();114         ResponseBody body = r.body();115         116         entity.setContent(body.byteStream());117         entity.setContentLength(body.contentLength());118         entity.setContentEncoding(r.header("Content-Encoding"));119         120         if (body.contentType() != null) {121             entity.setContentType(body.contentType().type());122         }123         return entity;124     }125     126     @SuppressWarnings("deprecation")127     private static void setConnectionParametersForRequest(128             okhttp3.Request.Builder builder, Request<?> request) throws IOException,129             AuthFailureError {130         switch (request.getMethod()) {131             case Request.Method.DEPRECATED_GET_OR_POST:132                 // Ensure backwards compatibility. Volley assumes a request with133                 // a null body is a GET.134                 byte[] postBody = request.getPostBody();135                 if (postBody != null) {136                     builder.post(RequestBody.create(137                             MediaType.parse(request.getPostBodyContentType()), postBody));138                 }139                 break;140             case Request.Method.GET:141                 builder.get();142                 break;143             case Request.Method.DELETE:144                 builder.delete();145                 break;146             case Request.Method.POST:147                 builder.post(createRequestBody(request));148                 break;149             case Request.Method.PUT:150                 builder.put(createRequestBody(request));151                 break;152             case Request.Method.HEAD:153                 builder.head();154                 break;155             case Request.Method.OPTIONS:156                 builder.method("OPTIONS", null);157                 break;158             case Request.Method.TRACE:159                 builder.method("TRACE", null);160                 break;161             case Request.Method.PATCH:162                 builder.patch(createRequestBody(request));163                 break;164             default:165                 throw new IllegalStateException("Unknown method type.");166         }167     }168     169     private static ProtocolVersion parseProtocol(final Protocol p) {170         switch (p) {171             case HTTP_1_0:172                 return new ProtocolVersion("HTTP", 1, 0);173             case HTTP_1_1:174                 return new ProtocolVersion("HTTP", 1, 1);175             case SPDY_3:176                 return new ProtocolVersion("SPDY", 3, 1);177             case HTTP_2:178                 return new ProtocolVersion("HTTP", 2, 0);179         }180         181         throw new IllegalAccessError("Unkwown protocol");182     }183     184     private static RequestBody createRequestBody(Request r) throws AuthFailureError {185         byte[] body = r.getBody();186         if (body == null) {187             // OkHttp内部默认的的判断逻辑是POST 不能为空，这里做了规避188             if (r.getMethod() == Request.Method.POST) {189                 body = "".getBytes();190             }191             else {192                 return null;193             }194         }195         196         return RequestBody.create(MediaType.parse(r.getBodyContentType()), body);197     }198 }

 在volley的调用：

1 OkHttpClient okClient = new OkHttpClient.Builder().build();2 3 RequestQueue queue = Volley.newRequestQueue(context, new OkHttpStack(okClient));