Android之网络通信Volley框架用法

概述：

Volley提供的功能

简单的讲，提供了如下主要的功能：

1、封装了的异步的RESTful 请求API；

2、一个优雅和稳健的请求队列；

3、一个可扩展的架构，它使开发人员能够实现自定义的请求和响应处理机制；

4、能够使用外部HTTP Client库；

5、缓存策略；

6、自定义的网络图像加载视图（NetworkImageView，ImageLoader等);

Volley也有两种加载方式DoGet和DoPost。

代码：

将volley框架单例封装成一个方法：

/** * Created by Administrator on 2015/9/14. * 单例模式的RequestQueue，可以防止内存溢出 */public class MySingleTon  {    private static MySingleTon mInstance;    private RequestQueue mRequestQueue;    private static Context mCtx;    private MySingleTon(Context context) {        mCtx = context;        mRequestQueue = getRequestQueue();    }    public static synchronized MySingleTon getInstance(Context context) {        if (mInstance == null) {            mInstance = new MySingleTon(context);        }        return mInstance;    }    public RequestQueue getRequestQueue() {        if (mRequestQueue == null) {            // getApplicationContext() is key, it keeps you from leaking the            // Activity or BroadcastReceiver if someone passes one in.            mRequestQueue = Volley.newRequestQueue(mCtx.getApplicationContext());        }        return mRequestQueue;    }    public <T> void addToRequestQueue(Request<T> req) {        getRequestQueue().add(req);    }}

DoGet方式：

private void volleyDoGet() {        //RequestQueue queue = Volley.newRequestQueue(getApplicationContext());        //response的监听有两种，一个是正确响应的监听，一个是错误响应的监听，当没有网络时，网络连接会出错        StringRequest request = new StringRequest(Request.Method.GET, "http://www.360.com", new Response.Listener<String>() {            @Override            public void onResponse(String response) {                mTextViewContent.setText(response);            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                mTextViewContent.setText("网络连接错误！");            }        });        MySingleTon.getInstance(getApplicationContext()).addToRequestQueue(request);    }

DoPost方式：

private void volleyDoPost() {        //RequestQueue queue = Volley.newRequestQueue(getApplicationContext());        StringRequest request = new StringRequest(Request.Method.POST, "http://192.168.0.30:8080/MyWebTest/MyTestServerlet", new Response.Listener<String>() {            @Override            public void onResponse(String response) {                mTextViewContent.setText(response);            }        }, new Response.ErrorListener() {            @Override            public void onErrorResponse(VolleyError error) {                mTextViewContent.setText("网络连接错误！");            }        }){            @Override            protected Map<String, String> getParams() throws AuthFailureError {                HashMap<String,String> map = new HashMap<>();                map.put("username","zhaoliu");                return map;            }        };        MySingleTon.getInstance(getApplicationContext()).addToRequestQueue(request);    }

结果演示：