Volley的三种基本用法StringRequest的Get和post用法以及JsonObjectRequest

首先做出整个应用的全局请求队列

package com.qg.lizhanqi.myvolleydemo;

import android.app.Application;

        import com.android.volley.RequestQueue;
        import com.android.volley.toolbox.HttpStack;
        import com.android.volley.toolbox.Volley;
/**
 * Created by lizhanqi on 2016-7-27-0027.
 */

/**
 * 这是一个本应用全局的Volley请求队列，所以这里继承了Application
 * 由于这是一个自定义的全局的application，所以在清单文件application中加入属性
 *   android:name=".MyApplication"
 */
public class MyApplication extends Application {
    public static RequestQueue queues;

    @Override
    public void onCreate() {
        super.onCreate();
        //实例化全局的请求队列
        queues = Volley.newRequestQueue(getApplicationContext(), (HttpStack) null);
    }
    public static RequestQueue getHttpQueues() {
        return queues;
    }
}

然后是StringRequest的GET请求方式

    private void volleyGetStringMonth(String url) {
         /**
         *  StringRequest(int method, String url, Listener<String> listener, ErrorListener errorListener)
         *   method请求方法 url请求路径，Listener请求成功的监听的回调，ErrorListener请求失败的监听回调
         */
        StringRequest sr = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {
                Log.i(TAG, "onResponse: 成功了");
                Toast.makeText(MainActivity.this, "请求成功volleyGetStringMonth" + s, Toast.LENGTH_SHORT).show();
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Log.i(TAG, "onErrorResponse: 失败了");
            }
        });
        //设置请求标签用于加入全局队列后，方便找到
        sr.setTag("stringquest");
        //添加到全局的请求队列
        MyApplication.getHttpQueues().add(sr);
    }

接着是StringRequest的POST请求方式的使用

    private void volleyPostStringMonth(String url) {
        StringRequest postsr = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
            @Override
            public void onResponse(String s) {
                Log.i(TAG, "onResponse: 成功了");
                Toast.makeText(MainActivity.this, "volleyPostStringMonth请求成功：" + s, Toast.LENGTH_SHORT).show();
            }
        }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError volleyError) {
                Log.i(TAG, "onErrorResponse: 失败了");
            }
        }) {
            @Override
            protected Map<String, String> getParams() throws AuthFailureError {
                //创建一个集合，放的是keyvalue的key是参数名与value是参数值
                Map<String, String> map = new HashMap<String, String>();
                map.put("type", "news");
                map.put("nums", "20");
                return map;
            }


        };
        //设置请求标签用于加入全局队列后，方便找到
        postsr.setTag("postsr");
        //添加到全局的请求队列
        MyApplication.getHttpQueues().add(postsr);
    }

最后是JsonObjectRequest的简单使用

        private void volleyGetJsonMonth(String url) {
            /*
            * JsonObjectRequest(int method, String url, JSONObject jsonRequest, Listener<JSONObject> listener, ErrorListener errorListener)
            method 请求方式
            url请求路径
             */
            JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
                @Override
                public void onResponse(JSONObject jsonObject) {
                    Log.i(TAG, "onResponse: JsonObjectRequest成功了");
                    Toast.makeText(MainActivity.this, "volleyGetJsonMonth请求成功:" + jsonObject, Toast.LENGTH_SHORT).show();
                }
            }, new Response.ErrorListener() {
                @Override
                public void onErrorResponse(VolleyError volleyError) {
                    Log.i(TAG, "onErrorResponse: JsonObjectRequest失败了");
                }
            });
            jsonObjectRequest.setTag("jsonObjectRequest");
            MyApplication.getHttpQueues().add(jsonObjectRequest);
        }

然后我们还可以重写onstop不可见后就取消请求

    @Override
    protected void onStop() {
        MyApplication.getHttpQueues().cancelAll("stringquest");
        MyApplication.getHttpQueues().cancelAll("jsonObjectRequest");
        MyApplication.getHttpQueues().cancelAll("postsr");
        super.onStop();
    }