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Android模仿jquery异步请求

2019年09月10日 ⁄ 移动开发 ⁄ 共 3196字 ⁄ 字号 小 中 大 ⁄ 评论关闭
01 package com.xbl.task;
02  
03 import java.io.BufferedReader;
04 import java.io.InputStream;
05 import java.io.InputStreamReader;
06 import java.net.URL;
07 import java.util.concurrent.Executor;
08 import java.util.concurrent.ExecutorService;
09 import java.util.concurrent.Executors;
10  
11 import android.os.Bundle;
12 import android.os.Handler;
13 import android.os.Message;
14 import android.util.Log;
15  
16  
17 public class JQuery
{
18      
19     private static final String
KEY = "key";
20     private static String
TAG = "JQuery";
21     private static final int N
= 5;//
5个工人 
22     private static final Executor
worker = Executors.newFixedThreadPool(N);//
线程池
23     private static final Handler
handler = new Handler(){
24         @Override
25         public void handleMessage(Message
msg) {
26             TaskListener
listener = (TaskListener)msg.obj;
27             Object
result = msg.getData();
28             if(listener
!=null ){
29                 listener.callBack(result);
30             }
31             destory();
32         }
33     };
34      
35     private JQuery(){      
36     }
37      
38     public static void execute(final String
url,final TaskListener
listener){
39         worker.execute(new Runnable()
{
40             @Override
41             public void run()
{
42                 String
result = null;
43                 try {
44                     result
= WebUtil.get(url);
45                 } catch (Exception
e) {
46                     Log.e(TAG,
e.getMessage());
47                 }
48                  
49                 Message
msg = new Message();
50                 Bundle
data = new Bundle();
51                 data.putSerializable(KEY,
result);
52                 msg.setData(data);
53                 msg.obj
= listener;
54                 handler.sendMessage(msg);
55             }
56         });
57     }
58      
59     //销毁线程
60     private static void destory()
{
61         if (worker
!= null &&
worker instanceof ExecutorService)
{
62             ExecutorService
es = (ExecutorService) worker;
63             if (!es.isShutdown())
{
64                 es.shutdown();
65             }
66         }
67     }  
68      
69     public interface TaskListener{
70         public void callBack(Object
result);
71     }
72     /**
73      *
74      *
不必太在意此处代码，只是示例
75      *
76      */
77     public static class WebUtil{
78          
79         public static String
get(String url) throws Exception{
80             InputStream
inputStream = new URL(url).openStream();
81             StringBuilder
strBuilder = new StringBuilder();
82             BufferedReader
reader = new BufferedReader(newInputStreamReader(inputStream));
83             for (String
s = reader.readLine(); s != null;
s = reader.readLine())
84                 strBuilder.append(s);
85              
86             inputStream.close();
87             return strBuilder.toString();
88         }
89     }
90 }

2. [代码][Java]代码     

01 //调用方法：
02 JQuery.execute("http://weather.news.qq.com/inc/minisite_125.js", newJQuery.TaskListener()
{               
03                 @Override
04                 public void callBack(Object
result) {
05                     TextView
t = new TextView(TaskDemoActivity.this);
06                     t.setText(String.valueOf(result));
07                     LinearLayout
layout = (LinearLayout)findViewById(R.id.layout1);
08                     layout.addView(t);
09                 }
10             });
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