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

1 package com.qg.lizhanqi.myvolleydemo;
2
3 import android.app.Application;
4
5         import com.android.volley.RequestQueue;
6         import com.android.volley.toolbox.HttpStack;
7         import com.android.volley.toolbox.Volley;
8 /**
9  * Created by lizhanqi on 2016-7-27-0027.
10  */
11
12 /**
13  * 这是一个本应用全局的Volley请求队列，所以这里继承了Application
14  * 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
15  *   android:name=".MyApplication"
16  */
17 public class MyApplication extends Application {
18     public static RequestQueue queues;
19
20     @Override
21     public void onCreate() {
22         super.onCreate();
23         //实例化全局的请求队列
24         queues = Volley.newRequestQueue(getApplicationContext(), (HttpStack) null);
25     }
26     public static RequestQueue getHttpQueues() {
27         return queues;
28     }
29 }

然后是StringRequest的GET请求方式

1     private void volleyGetStringMonth(String url) {
2          /**
3          *  StringRequest(int method, String url, Listener<String> listener, ErrorListener errorListener)
4          *   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
5          */
6         StringRequest sr = new StringRequest(Request.Method.GET, url, new Response.Listener<String>() {
7             @Override
8             public void onResponse(String s) {
9                 Log.i(TAG, "onResponse: 成功了");
10                 Toast.makeText(MainActivity.this, "请求成功volleyGetStringMonth" + s, Toast.LENGTH_SHORT).show();
11             }
12         }, new Response.ErrorListener() {
13             @Override
14             public void onErrorResponse(VolleyError volleyError) {
15                 Log.i(TAG, "onErrorResponse: 失败了");
16             }
17         });
18         //设置请求标签用于加入全局队列后，方便找到
19         sr.setTag("stringquest");
20         //添加到全局的请求队列
21         MyApplication.getHttpQueues().add(sr);
22     }

接着是StringRequest的POST请求方式的使用

1     private void volleyPostStringMonth(String url) {
2         StringRequest postsr = new StringRequest(Request.Method.POST, url, new Response.Listener<String>() {
3             @Override
4             public void onResponse(String s) {
5                 Log.i(TAG, "onResponse: 成功了");
6                 Toast.makeText(MainActivity.this, "volleyPostStringMonth请求成功：" + s, Toast.LENGTH_SHORT).show();
7             }
8         }, new Response.ErrorListener() {
9             @Override
10             public void onErrorResponse(VolleyError volleyError) {
11                 Log.i(TAG, "onErrorResponse: 失败了");
12             }
13         }) {
14             @Override
15             protected Map<String, String> getParams() throws AuthFailureError {
16                 //创建一个集合，放的是keyvalue的key是参数名与value是参数值
17                 Map<String, String> map = new HashMap<String, String>();
18                 map.put("type", "news");
19                 map.put("nums", "20");
20                 return map;
21             }
22
23
24         };
25         //设置请求标签用于加入全局队列后，方便找到
26         postsr.setTag("postsr");
27         //添加到全局的请求队列
28         MyApplication.getHttpQueues().add(postsr);
29     }

最后是JsonObjectRequest的简单使用

1         private void volleyGetJsonMonth(String url) {
2             /*
3             * JsonObjectRequest(int method, String url, JSONObject jsonRequest, Listener<JSONObject> listener, ErrorListener errorListener)
4             method 请求方式
5             url请求路径
6              */
7             JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, url, null, new Response.Listener<JSONObject>() {
8                 @Override
9                 public void onResponse(JSONObject jsonObject) {
10                     Log.i(TAG, "onResponse: JsonObjectRequest成功了");
11                     Toast.makeText(MainActivity.this, "volleyGetJsonMonth请求成功:" + jsonObject, Toast.LENGTH_SHORT).show();
12                 }
13             }, new Response.ErrorListener() {
14                 @Override
15                 public void onErrorResponse(VolleyError volleyError) {
16                     Log.i(TAG, "onErrorResponse: JsonObjectRequest失败了");
17                 }
18             });
19             jsonObjectRequest.setTag("jsonObjectRequest");
20             MyApplication.getHttpQueues().add(jsonObjectRequest);
21         }

然后我们还可以重写onstop不可见后就取消请求

1     @Override
2     protected void onStop() {
3         MyApplication.getHttpQueues().cancelAll("stringquest");
4         MyApplication.getHttpQueues().cancelAll("jsonObjectRequest");
5         MyApplication.getHttpQueues().cancelAll("postsr");
6         super.onStop();
7     }