tabActivity的简单实现

需要注意tabhost，framelayout，以及tabwidget的id都是android自带的那种。
指定好的。这边tab标签卡设置为底部的

<?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">

	<TabHost android:id="@android:id/tabhost" android:layout_width="match_parent"
		android:layout_height="match_parent">
		<FrameLayout android:orientation="vertical" android:id="@android:id/tabcontent"
			android:layout_width="fill_parent" android:layout_height="fill_parent">
			<TextView android:layout_width="fill_parent" android:id="@+id/tab1"
				android:layout_height="wrap_content" android:text="tab1" />
			<TextView android:layout_width="fill_parent" android:id="@+id/tab2"
				android:layout_height="wrap_content" android:text="tab2" />
			<TextView android:layout_width="fill_parent" android:id="@+id/tab3"
				android:layout_height="wrap_content" android:text="tab3" />
			<TextView android:layout_width="fill_parent" android:id="@+id/tab4"
				android:layout_height="wrap_content" android:text="tab4" />
		</FrameLayout>
			<TabWidget android:layout_width="match_parent"
				android:layout_height="match_parent" 
				android:id = "@android:id/tabs"   android:layout_gravity="center"
				android:gravity="bottom"/>
	</TabHost>
</LinearLayout>

package com.nico.tab;


import android.app.TabActivity;
import android.os.Bundle;
import android.widget.TabHost;

public class TestTabMain extends TabActivity {
	/** Called when the activity is first created. */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.tabxml);
		TabHost tabhost = getTabHost();
		tabhost.setup();
		tabhost.addTab(tabhost.newTabSpec("tab1").setIndicator("tab1")
				.setContent(R.id.tab1));
		tabhost.addTab(tabhost.newTabSpec("tab2").setIndicator("tab2")
				.setContent(R.id.tab2));
		tabhost.addTab(tabhost.newTabSpec("tab3").setIndicator("tab3")
				.setContent(R.id.tab3));
		tabhost.addTab(tabhost.newTabSpec("tab4").setIndicator("tab4")
				.setContent(R.id.tab4));
		//设置默认选中项
		tabhost.setCurrentTab(3);
	}
}