《使用选项卡实现界面切换》

package com.example.ui1;

import android.os.Bundle;
import android.app.Activity;
import android.app.TabActivity;
import android.content.Intent;
import android.view.Menu;
import android.widget.TabHost;
import android.widget.TabHost.TabSpec;

public class MainActivity extends TabActivity {
	private TabHost tabHost;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		tabHost=getTabHost();
		AddTabPage1();
		AddTabPage2();
		AddTabPage3();
		
	}

	


	private void AddTabPage1() {
		// TODO Auto-generated method stub
		Intent intent1=new Intent();
		intent1.setClass(this,Act1.class);
		TabSpec tabSpec=tabHost.newTabSpec("act1");
		tabSpec.setIndicator("",getResources().getDrawable(R.drawable.e));
		tabSpec.setContent(intent1);          
		tabHost.addTab(tabSpec);
		
		
	}
	private void AddTabPage2() {
		// TODO Auto-generated method stub
		Intent intent2=new Intent();
		intent2.setClass(this,Act2.class);
		TabSpec tabSpec=tabHost.newTabSpec("act2");
		tabSpec.setIndicator("",getResources().getDrawable(R.drawable.f));
		tabSpec.setContent(intent2);          
		tabHost.addTab(tabSpec);
		
	}
	private void AddTabPage3() {
		// TODO Auto-generated method stub
		Intent intent3=new Intent();
		intent3.setClass(this,Act3.class);
		TabSpec tabSpec=tabHost.newTabSpec("act3");
		tabSpec.setIndicator("",getResources().getDrawable(R.drawable.d));
		tabSpec.setContent(intent3);          
		tabHost.addTab(tabSpec);
		
		
	}



	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// Inflate the menu; this adds items to the action bar if it is present.
		getMenuInflater().inflate(R.menu.main, menu);
		return true;
	}

}

<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@android:id/tabhost"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent" >
    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >

        <TabWidget
            android:id="@android:id/tabs"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:paddingLeft="1dip"
            android:paddingRight="1dip"
            android:paddingTop="4dip" />

        <FrameLayout
            android:id="@android:id/tabcontent"
            android:layout_width="fill_parent"
            android:layout_height="1dip"
            android:layout_weight="1" />
    </LinearLayout>

</TabHost>

<?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"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/aa"
        android:text="第一幅" />

</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"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/textView2"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/bb"
        android:text="第二幅" />

</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"
    android:orientation="vertical" >
    <TextView
        android:id="@+id/textView3"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:background="@drawable/cc"
        android:text="第三幅" />
    

</LinearLayout>