1 package com.example.asynctask;
 2 
 3 import android.app.Activity;
 4 import android.os.AsyncTask;
 5 import android.os.Bundle;
 6 import android.util.Log;
 7 import android.widget.TextView;
 8 
 9 public class MainActivity extends Activity {
10     private TextView tv_text;
11 
12     @Override
13     protected void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16         tv_text = (TextView) findViewById(R.id.tv_text);
17         
18         MyAsyncTask task=new  MyAsyncTask();
19         //执行
20         task.execute("www.baidu.com");
21     }
22 
23     class MyAsyncTask extends AsyncTask<String,Integer, String> {
24         /**
25          * 被主线程执行，在doInBackground函数前执行
26          * */
27         @Override
28         protected void onPreExecute() {
29             // 弹加载对话框
30             Log.d("bh", "onPreExecute");
31         }
32 
33         /**
34          * 被子线程执行，用来处理耗时行为
35          * */
36         @Override
37         protected String doInBackground(String... params) {
38             Log.d("bh", "doInBackground:"+params[0]);
39             for(int i=1;i<=100;i++){
40                 try {
41                     Thread.sleep(1000);
42                     //推送当前的进度
43                     publishProgress(i);
44                 } catch (InterruptedException e) {
45                     e.printStackTrace();
46                 }
47             }
48             return null;
49         }
50         @Override
51         protected void onProgressUpdate(Integer... values) {
52             //更新UI上的进度
53             tv_text.setText(values[0]+"");
54         }
55         /**
56          * 被主线程执行，在doInBackground函数后执行
57          * */
58         @Override
59         protected void onPostExecute(String result) {
60             Log.d("bh", "onPostExecute");
61             // 更UI数据
62             tv_text.setText(result);
63         }
64     }
65 }