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();
     }