界面之间的跳转，一种是setContentView,一种是activity

1、用setContentView方法

各个文件定义

layout2.xml

<?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"
    android:background="@drawable/black"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello2"
    />
<Button
    android:id="@+id/button02"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/buttontext2"/>
</LinearLayout>

main.xml

<?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"
    android:background="@drawable/white"
    >
<TextView  
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/hello1"
    />
<Button
    android:id="@+id/button01"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text="@string/buttontext1"/>
</LinearLayout>

color.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <drawable name="white">#123123</drawable>
    <drawable name="black">#000001</drawable>
</resources>

strings.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="hello">Hello World, LayoutChangeTest!</string>
    <string name="app_name">LayoutChangeTest</string>
    <string name="hello1">Hello，我是布局1</string>
    <string name="hello2">Hello，我是布局2</string>
    <string name="buttontext1">我是button1，按我跳转到layout2</string> 
    <string name="buttontext2">我是button2，按我跳转到layout1</string> 
</resources>

java代码

package com.lay.test;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
public class LayoutChangeTest extends Activity {
    /** Called when the activity is first created. */
    private Button button1;
    private Button button2;
    private String TAG="LayoutChangeTest";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        button1=(Button)findViewById(R.id.button01);
        button1.setOnClickListener(listener);
    }
    public OnClickListener listener = new OnClickListener() {

        @Override
        public void onClick(View v) {
            // TODO Auto-generated method stub
            if (v.getId() == R.id.button01) {
                //把button2的再次定义和监听放到这儿不行
               /* button2 = (Button) findViewById(R.id.button02);
                button2.setOnClickListener(listener);*/
                gotoLayout2();
                //方法1：可以把button2的定义和监听放到这里
                /*button2 = (Button) findViewById(R.id.button02);
                button2.setOnClickListener(listener);*/
            } else if (v.getId() == R.id.button02) {
                gotoLayout1();
            }else {
                Log.v(TAG,"dddd");
            }
        }
    };

    private void gotoLayout2() {
        setContentView(R.layout.layout2);
        //方法2可以把button2的定义和监听放到这里
        button2 = (Button) findViewById(R.id.button02);
        button2.setOnClickListener(listener);
    }
    private void gotoLayout1() {
        setContentView(R.layout.main);
        button1 = (Button) findViewById(R.id.button01);
        button1.setOnClickListener(listener);
        
      }
}

分析：必须在

gotoLayout1()和
gotoLayout2()中重新获取button对象，因为还是同一个activity，但是view变了，因为视图一改变，所以要重新获取view，并且重新再监听，这样就可以实现两个布局之间的相互转换了。。
注意2点：1、重新获取view，此中是button对象
               2、重新监听