handle 与 Message

 1 package com.douaty.asynctaskdemo;
 2
 3 import android.app.Activity;
 4 import android.os.Bundle;
 5 import android.os.Handler;
 6 import android.os.Message;
 7 import android.view.View;
 8 import android.widget.Button;
 9 import android.widget.TextView;
10
11
12 public class MessageActivity extends Activity {
13
14     int messageId = 0x1000;
15     TextView tv_connet;
16     Button bt_send;
17     Button bt_post;
18
19     private Handler handler = new Handler() {
20         @Override
21         public void handleMessage(Message msg){
22             if (msg.what == messageId){
23                 tv_connet.setText((String)msg.obj);
24                 System.out.println("--arg1: " + msg.arg1 + ",  arg2: " + msg.arg2);
25             }
26         }
27     };
28
29     @Override
30     protected void onCreate(Bundle savedInstanceState) {
31         super.onCreate(savedInstanceState);
32         setContentView(R.layout.activity_message);
33
34         tv_connet = (TextView) findViewById(R.id.tv_showcontnet);
35         bt_send = (Button) findViewById(R.id.bt_send);
36         bt_post = (Button) findViewById(R.id.bt_post);
37
38         bt_send.setOnClickListener(new View.OnClickListener() {
39             @Override
40             public void onClick(View v) {
41                 new Thread(new Mythread()).start();
42             }
43         });
44
45         bt_post.setOnClickListener(new View.OnClickListener() {
46             @Override
47             public void onClick(View v) {
48                 handler.post(new Runnable() {
49                     @Override
50                     public void run() {
51                         Message msg = Message.obtain(handler, messageId, 123, 456, "hello");
52                         msg.sendToTarget();
53                     }
54                 });
55             }
56         });
57     }
58
59     public class Mythread implements Runnable {
60
61         @Override
62         public void run() {
63             try {
64                 Thread.sleep(1000);
65             } catch (InterruptedException e) {
66                 e.printStackTrace();
67             }
68 //            //方式1
69 //            Message msg = Message.obtain();
70 //            msg.obj = "我是一个Handler！";
71 //            msg.what = messageId;
72 //            handler.sendMessage(msg);
73 //            //方式2
74 //            Message msg = Message.obtain(handler);
75 //            msg.obj = "我是一个Handler！";
76 //            msg.what = messageId;
77 //            msg.sendToTarget();
78 //            //方式3
79 //            Message msg = Message.obtain(handler, messageId);
80 //            msg.obj = "我是一个Handler！";
81 //            msg.sendToTarget();
82 //            //方式4
83 //            Message msg = Message.obtain(handler, messageId, "我是一个Handler！");
84 //            msg.sendToTarget();
85             //方式5
86             Message msg = Message.obtain(handler, messageId, 123, 456, "hello");
87             msg.sendToTarget();
88         }
89     }
90 }