手机页面转换--关于setContentView的应用

要实现手机页面的转换，最简单的方式就是改变Activity的Layout！下面我做的这个是将布局两个layout，默认载入的layout是main.xml，且在layout1中创建一个按钮，当单击按钮的时候，显示第二个layout（mylayout.xml），同样的，在layout2中也创建一个按钮，当单击按钮的时候，显示第一个layout1

package prac.ex09_01;

import android.app.Activity;
import android.os.Bundle;
import android.widget.Button;
import android.view.View;


public class EX09_01 extends Activity {
	/** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        Button b1 = (Button) findViewById(R.id.button1);
        b1.setOnClickListener(new Button.OnClickListener()
        {
          public void onClick(View v)
          {
            jumpToLayout2();
          }
        });
      }
    
    public void jumpToLayout2()
    {
    	setContentView(R.layout.mylayout);
    	  Button b2 = (Button) findViewById(R.id.button2);
          b2.setOnClickListener(new  Button.OnClickListener()
          {
         	public void onClick(View v)
         	{
         		jumpToLayout1();
         	}
         });
     }
    public void jumpToLayout1()
    {
    	setContentView(R.layout.main);
    	Button b1 = (Button) findViewById(R.id.button1);
        b1.setOnClickListener(new Button.OnClickListener()
        {
         	public void onClick(View v)
         	{
         		jumpToLayout2();
         	}
         });
     }
}

main.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 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:id="@+id/text1"
    android:textSize="24sp"
    android:layout_width="186px" 
    android:layout_height="29px" 
    android:layout_x="70px"
    android:layout_y="32px"  
    android:text="This is layout1"
    />
    
<Button 
    android:text="Go to Layout2" 
    android:id="@+id/button1" 
    android:layout_width="118px" 
     android:layout_x="100px"
    android:layout_y="82px"
    android:layout_height="wrap_content">
</Button>
</AbsoluteLayout>

mylayout.xml

<?xml version="1.0" encoding="utf-8"?>
<AbsoluteLayout 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:id="@+id/text2"
    android:textSize="24sp"
    android:layout_width="186px" 
    android:layout_height="29px" 
    android:layout_x="70px"
    android:layout_y="32px"
    android:textColor="@drawable/black"    
    android:text="This is layout2"
    />
    
<Button 
    android:text="Go to Layout1" 
    android:id="@+id/button2" 
    android:layout_width="118px" 
     android:layout_x="100px"
    android:layout_y="82px"
    android:layout_height="wrap_content">
</Button>
</AbsoluteLayout>

string.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
      <drawable name="black">#000000</drawable>
     <drawable name="white">#FFFFFFFF</drawable>
</resources>

运行结果：

点击按钮则：