android之实现底部TabHost

<?xml version="1.0" encoding="utf-8"?>
<TabHost xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@android:id/tabhost" 
     android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <RelativeLayout
        android:background="@drawable/g"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
    <TabWidget android:id="@android:id/tabs"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true">
    </TabWidget>
    <FrameLayout android:id="@android:id/tabcontent"
        android:layout_width="fill_parent"
        android:layout_height="fill_parent">
        <RelativeLayout android:id="@+id/tabFirst"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical">
        <AnalogClock
            android:id="@+id/widget31"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_centerInParent="true">
        </AnalogClock>
        </RelativeLayout>>
        <RelativeLayout android:id="@+id/tabSecond"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent"
            android:orientation="vertical">
            <DigitalClock
                android:layout_centerInParent="true"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content">
            </DigitalClock>
        </RelativeLayout>
    </FrameLayout>
    </RelativeLayout>
</TabHost>

package com.cloay;

import android.app.TabActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.Toast;

public class TabTestActivity extends TabActivity {
    TabHost tabHost;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        //获取TabHost对象
        tabHost = getTabHost();   
//        tabHost.setup();
        //新建一个newTabSpec,设置标签和图标(setIndicator),设置内容(setContent)
        tabHost.addTab(tabHost.newTabSpec("Test one").setIndicator("",getResources().getDrawable(android.R.drawable.ic_menu_call)).setContent(R.id.tabFirst));
        tabHost.addTab(tabHost.newTabSpec("Test two").setIndicator("",getResources().getDrawable(android.R.drawable.ic_menu_camera)).setContent(R.id.tabSecond));
        //设置TabHost的背景颜色
        tabHost.setBackgroundColor(Color.argb(150,22,70,150));
        //设置TabHost的背景图片资源
//        tabHost.setBackgroundResource(R.drawable.bg);
        //设置当前现实哪一个标签
        tabHost.setCurrentTab(0);   //0为标签ID
        //标签切换处理，用setOnTabChangedListener    
        tabHost.setOnTabChangedListener(new OnTabChangeListener(){
            public void onTabChanged(String tabId){
                Toast.makeText(TabTestActivity.this, "This is a Test!", Toast.LENGTH_LONG).show();
            }
        });
    }
}