1 package com.example.test02;
 2 
 3 import android.os.Bundle;
 4 import android.app.Activity;
 5 import android.view.Menu;
 6 import android.view.View;
 7 import android.widget.Button;
 8 
 9 public class MainActivity extends Activity {
10     Button b1 =null;
11     Button b2 =null;
12     @Override
13     public void onCreate(Bundle savedInstanceState) {
14         super.onCreate(savedInstanceState);
15         setContentView(R.layout.activity_main);
16         b1 = (Button) findViewById(R.id.button1);
17         b1.setOnClickListener( new Button.OnClickListener(){
18             
19             public void onClick(View v) {
20                 switchLayoutOne();
21                 
22             }
23             
24         } );
25     }
26     public void switchLayoutOne (){
27         setContentView(R.layout.activity_main2);
28         b2 = (Button) findViewById(R.id.button2);
29         b2.setOnClickListener( new Button.OnClickListener(){
30             public void onClick(View v){
31                 switchLayoutTwo();
32             }
33         });
34     }
35     public void switchLayoutTwo (){
36         setContentView(R.layout.activity_main);
37         b1 = (Button) findViewById(R.id.button1);
38         b1.setOnClickListener( new Button.OnClickListener(){
39             public void onClick(View v){
40                 switchLayoutOne();
41             }
42         });
43     }
44     @Override
45     public boolean onCreateOptionsMenu(Menu menu) {
46         getMenuInflater().inflate(R.menu.activity_main, menu);
47         return true;
48     }
49 }