Android Volley源码分析及扩展

今天药忘吃喽~ 2022-01-07 17:59 198阅读 0赞

> 转载请标明出处：  
> [http://www.cnblogs.com/why168888/p/6681232.html][http_www.cnblogs.com_why168888_p_6681232.html]
> 
> 本文出自:[【Edwin博客园】][Edwin]

## [Volley][] ##

### 介绍 ###

*  Android系统中主要提供了两种方式来进行HTTP通信，HttpURLConnection和HttpClient
 *  Android 4.4以上使用HttpURLConnection底层使用OkHttp实现
 *  Volley自带Request
    
     *  StringRequest
     *  ImageRequest
     *  JsonObjectRequest
     *  ClearCacheRequest
 *  对Volley扩展的Request
    
     *  XMLRequest
     *  JsonArrayRequest
     *  MultipartRequest
     *  GsonRequest
 *  HttpStack
    
     *  HurlStack
     *  HttpClientStack
     *  OkApacheClientStack
     *  OkHttpURLConnectionStack
 *  实现底层HttpURLConnection替换成OkHttp
 *  TrafficStats——流量统计类的范例，获取实时网速
    
     *  static long getMobileRxBytes() //获取通过Mobile连接收到的字节总数，不包含WiFi
     *  static long getMobileRxPackets() //获取Mobile连接收到的数据包总数
     *  static long getMobileTxPackets() //Mobile发送的总数据包数
     *  static long getTotalRxBytes() //获取总的接受字节数，包含Mobile和WiFi等
     *  static long getTotalRxPackets() //总的接受数据包数，包含Mobile和WiFi等
     *  static long getTotalTxBytes() //总的发送字节数，包含Mobile和WiFi等
     *  static long getTotalTxPackets() //发送的总数据包数，包含Mobile和WiFi等
     *  static long getUidRxBytes(int uid) //获取某个网络UID的接受字节数，某一个进程的总接收量
     *  static long getUidTxBytes(int uid) //获取某个网络UID的发送字节数，某一个进程的总发送量
 *  Process.setThreadPriority(Process.THREAD\_PRIORITY\_BACKGROUND);//设置线程优先级为后台，这样当多个线程并发后很多无关紧要的线程分配的CPU时间将会减少，有利于主线程的处理，有以下几种:
    
     *  int THREAD\_PRIORITY\_AUDIO //标准音乐播放使用的线程优先级
     *  int THREAD\_PRIORITY\_BACKGROUND //标准后台程序
     *  int THREAD\_PRIORITY\_DEFAULT // 默认应用的优先级
     *  int THREAD\_PRIORITY\_DISPLAY //标准显示系统优先级，主要是改善UI的刷新
     *  int THREAD\_PRIORITY\_FOREGROUND //标准前台线程优先级
     *  int THREAD\_PRIORITY\_LESS\_FAVORABLE //低于favorable
     *  int THREAD\_PRIORITY\_LOWEST //有效的线程最低的优先级
     *  int THREAD\_PRIORITY\_MORE\_FAVORABLE //高于favorable
     *  int THREAD\_PRIORITY\_URGENT\_AUDIO //标准较重要音频播放优先级
     *  int THREAD\_PRIORITY\_URGENT\_DISPLAY //标准较重要显示优先级，对于输入事件同样适用。

### 参考资料 ###

*  [https://developer.android.com/training/volley/index.html][https_developer.android.com_training_volley_index.html]
 *  [https://android-developers.googleblog.com/2011/09/androids-http-clients.html][https_android-developers.googleblog.com_2011_09_androids-http-clients.html]

### 示例代码 ###

compile 'com.squareup.okhttp3:okhttp-urlconnection:3.6.0'
    compile 'com.squareup.okhttp3:okhttp-apache:3.6.0'
    compile 'com.squareup.okhttp3:okhttp:3.6.0'
    compile 'com.squareup.okhttp3:logging-interceptor:3.6.0'
    compile 'com.google.code.gson:gson:2.8.0'

/**
         * 请求方式一：
         * <p>
         * volley默认的请求方式
         * 2.3以后底层用的是HttpURLConnection
         */
        void HttpRequest$1() {
            RequestQueue queue = Volley.newRequestQueue(this);
            queue.add(initializedRequest());
        }
    
        /**
         * 请求方式二：
         * 底层使用okHttp-apache
         */
        void HttpRequest$2() {
            OkApacheClient okApacheClient = new OkApacheClient();
            OkApacheClientStack clientStack = new OkApacheClientStack(okApacheClient);
    
            RequestQueue queue = Volley.newRequestQueue(this, clientStack);
            queue.add(initializedRequest());
        }
    
        /**
         * 请求方式三：
         * 底层使用okHttp-urlConnection
         */
        void HttpRequest$3() {
            OkHttpURLConnectionStack clientStack = new OkHttpURLConnectionStack();
    
            RequestQueue queue = Volley.newRequestQueue(this, clientStack);
            queue.add(initializedRequest());
        }
    
        Request initializedRequest() {
            return new StringRequest(Request.Method.GET,
                    "http://www.aybrowser.com/sdk/partners/",
                    new Response.Listener<String>() {
                        @Override
                        public void onResponse(String response) {
                            Log.e("Edwin", "response = " + response);
                        }
                    },
                    new Response.ErrorListener() {
                        @Override
                        public void onErrorResponse(VolleyError error) {
                            Log.e("Edwin", "VolleyError = " + error);
                        }
                    });
        }
    
        /**
         * post请求
         * 多类型上传
         * 文件+字符
         */
        void MultipartRequest$4() {
            try {
                //构造参数列表
                List<Part> partList = new ArrayList<Part>();
                partList.add(new StringPart("username", "edwin"));
                partList.add(new StringPart("email", "edwin.wu@gmail.com"));
    
                String path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/ic_launcher.png";
                partList.add(new FilePart("ic_launcher", new File(path)));
    
                //获取队列
                RequestQueue requestQueue = Volley.newRequestQueue(this);
                String url = "http://www.cnblogs.com/";
                //生成请求
                MultipartRequest profileUpdateRequest = new MultipartRequest(url,
                        partList.toArray(new Part[partList.size()]),
                        new Response.Listener<String>() {
                            @Override
                            public void onResponse(String response) {
                                Log.e("Edwin", "onResponse : " + response);
                            }
                        },
                        new Response.ErrorListener() {
                            @Override
                            public void onErrorResponse(VolleyError error) {
                                Log.e("Edwin", "MultipartRequest : " + error.getMessage(), error);
                            }
                        }) {
                    @Override
                    public String getBodyContentType() {
                        return super.getBodyContentType();
                    }
    
                };
                requestQueue.add(profileUpdateRequest);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

转载于:https://www.cnblogs.com/why168888/p/6681232.html

[http_www.cnblogs.com_why168888_p_6681232.html]: http://www.cnblogs.com/why168888/p/6681232.html
[Edwin]: http://www.cnblogs.com/why168888/
[Volley]: https://github.com/why168/AndroidProjects/tree/master/VolleyStudy
[https_developer.android.com_training_volley_index.html]: https://developer.android.com/training/volley/index.html
[https_android-developers.googleblog.com_2011_09_androids-http-clients.html]: https://android-developers.googleblog.com/2011/09/androids-http-clients.html