android TabHost 使用

package com.android.tabhost;

import android.app.TabActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;

public class TabActivtiy extends TabActivity{
    private String TAG="==TabActivtiy=";
    private TabHost mHost;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mHost=getTabHost();
        LayoutInflater.from(this).inflate(R.layout.main,mHost.getTabContentView(),true);
        mHost.setBackgroundColor(Color.argb(80, 128,128,128));
        mHost.addTab(mHost.newTabSpec("aa").setIndicator("aaaaaa", getResources().getDrawable(R.drawable.icon)).setContent(R.id.one));
        mHost.addTab(mHost.newTabSpec("bb").setIndicator("bbbbbb", getResources().getDrawable(R.drawable.icon)).setContent(R.id.two));
        mHost.addTab(mHost.newTabSpec("cc").setIndicator("cccccc", getResources().getDrawable(R.drawable.icon)).setContent(R.id.three));
        mHost.setOnTabChangedListener(new OnTabChangeListener() {
            
            @Override
            public void onTabChanged(String tabId) {
                
                Log.i(TAG, "=tabId="+tabId);//tabId is aa bb cc
            }
        });
        //setContentView(R.layout.main);
    }

}

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent" android:layout_height="fill_parent">
    <LinearLayout android:id="@+id/one"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        androidrientation="vertical" >
        <TextView  android:id="@+id/one_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="one"
        />
        <ImageView android:id="@+id/one_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
    </LinearLayout>
    <LinearLayout android:id="@+id/two"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        androidrientation="vertical"  >
        <TextView  android:id="@+id/two_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="two"
        />
        <ImageView android:id="@+id/two_image"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
        <ImageView android:id="@+id/two_image_two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
    </LinearLayout>

    <LinearLayout android:id="@+id/three"
        android:layout_width="fill_parent" android:layout_height="fill_parent"
        androidrientation="vertical">
        <TextView  android:id="@+id/three_txt"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="three"
        />
        <ImageView android:id="@+id/three_image_one"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
        <ImageView android:id="@+id/three_image_two"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
         <ImageView android:id="@+id/three_image_three"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:background="@drawable/icon"/>
    </LinearLayout>
</FrameLayout>