Android简单的handler处理

 1 package com.example.androidprojecttest;
 2 
 3 import android.os.Bundle;
 4 import android.os.Handler;
 5 import android.os.Message;
 6 import android.os.Messenger;
 7 import android.R.id;
 8 import android.app.Activity;
 9 import android.content.Intent;
10 import android.view.Menu;
11 import android.view.View;
12 import android.view.View.OnClickListener;
13 import android.widget.Button;
14 import android.widget.LinearLayout;
15 import android.widget.TextView;
16 
17 public class MainActivity extends Activity {
18 
19     private TextView tView;
20 
21     private Handler mHandler = new Handler() {
22         @Override
23         public void handleMessage(Message msg) {
24             // TODO 接收消息并且去更新UI线程上的控件内容
25             if (msg.what == 1) {
26                 tView.setText(String.valueOf(msg.obj));
27             }
28             super.handleMessage(msg);
29         }
30 
31     };
32 
33     @Override
34     protected void onCreate(Bundle savedInstanceState) {
35         super.onCreate(savedInstanceState);
36         setContentView(R.layout.activity_main);
37         tView = (TextView) findViewById(R.id.tv);
38 
39         new Thread() {
40             public void run() {
41                 try {
42                     for (int i = 0; i < 100; i++) {
43                         Thread.sleep(500);
44                         Message msgMessage=new Message();
45                         msgMessage.what=1;
46                         msgMessage.obj="更新后的值是："+i;
47                         mHandler.sendMessage(msgMessage);
48                     }
49                 } catch (Exception e) {
50                     e.printStackTrace();
51                 }
52             }
53         }.start();
54     }
55 
56 }