<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
 android:orientation="vertical" 
 android:layout_width="fill_parent" 
 android:layout_height="fill_parent" 
 > 
<TextView 
 android:layout_width="fill_parent" 
 android:layout_height="wrap_content" 
 android:text="@string/hello" 
 /> 
<Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="下一页面 "></Button>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?> 
<LinearLayout 
 xmlns:android="http://schemas.android.com/apk/res/android" 
 android:layout_width="match_parent" 
 android:layout_height="match_parent"> 
 <Button android:layout_width="wrap_content" android:layout_height="wrap_content" android:text="上一页面 " android:id="@+id/button1"></Button> 
</LinearLayout>

package com.makechoice; 
import android.app.Activity; 
import android.os.Bundle; 
import android.view.View; 
import android.widget.Button; 
public class makechoice extends Activity 
{ 
 /** Called when the activity is first created. */ 
 @Override 
 public void onCreate(Bundle savedInstanceState) 
 { 
  super.onCreate(savedInstanceState); 
  setContentView(R.layout.main); 
  Button btn = (Button)findViewById(R.id.button1); 
  btn.setOnClickListener(new Button.OnClickListener() 
  { 
   @Override 
   public void onClick(View v) 
   { 
    jump2ok(); 
   } 
  }); 
 } 
 //跳到ok页面 
 public void jump2ok() 
 { 
  setContentView(R.layout.ok); 
  //当有按键按下跳到main页面 
  Button btn = (Button)findViewById(R.id.button1); 
  btn.setOnClickListener(new Button.OnClickListener() 
  { 
   @Override 
   public void onClick(View v) 
   { 
    jump2main(); 
   } 
  }); 
 } 
 //跳到main页面 
 public void jump2main() 
 { 
  setContentView(R.layout.main); 
  //当有按键按下跳到ok页面 
  Button btn = (Button)findViewById(R.id.button1); 
  btn.setOnClickListener(new Button.OnClickListener() 
  { 
   @Override 
   public void onClick(View v) 
   { 
    jump2ok(); 
   } 
  }); 
 } 
}