Android handle 练习

 1 <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context=".MainActivity" >
10 
11     <TextView
12         android:id="@+id/text_id"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="@string/hello_world" />
16     <Button 
17         android:id="@+id/btn"
18         android:layout_width="wrap_content"
19         android:layout_height="wrap_content"
20         android:text="Button"
21         android:layout_below="@id/text_id"
22         
23         />
24 
25 </RelativeLayout>

 1 package com.ibox365.s0725001;
 2 
 3 import android.os.Bundle;
 4 import android.os.Handler;
 5 import android.os.Message;
 6 import android.app.Activity;
 7 import android.view.Menu;
 8 import android.view.View;
 9 import android.view.View.OnClickListener;
10 import android.widget.Button;
11 
12 public class MainActivity extends Activity {
13 
14     private Button button;
15     private Handler handler;
16     
17     @Override
18     protected void onCreate(Bundle savedInstanceState) {
19         super.onCreate(savedInstanceState);
20         setContentView(R.layout.activity_main);
21         
22         button=(Button) findViewById(R.id.btn);
23         button.setOnClickListener(new ButtonListen());
24         
25         handler=new myHandle();
26         
27     }
28     
29     class ButtonListen implements OnClickListener
30     {
31 
32         /* (non-Javadoc)
33          * @see android.view.View.OnClickListener#onClick(android.view.View)
34          */
35         @Override
36         public void onClick(View v) {
37             // TODO Auto-generated method stub
38             
39             Message msg=handler.obtainMessage();
40             msg.what=2;
41             handler.sendMessage(msg);
42         }
43         
44         
45     }
46     
47     class  myHandle extends Handler{
48 
49         /* (non-Javadoc)
50          * @see android.os.Handler#handleMessage(android.os.Message)
51          */
52         @Override
53         public void handleMessage(Message msg) {
54             // TODO Auto-generated method stub
55             super.handleMessage(msg);
56             
57         int what    =msg.what;
58         System.out.println(what);
59             
60         }
61         
62         
63     } 
64 
65     @Override
66     public boolean onCreateOptionsMenu(Menu menu) {
67         // Inflate the menu; this adds items to the action bar if it is present.
68         getMenuInflater().inflate(R.menu.main, menu);
69         return true;
70     }
71 
72 }