android之实现底部TabHost

先说布局文件，如下：利用android:layout_alignParentBottom="true" 实现底部显示

<?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>

下面是主程序代码，注释写的比较详细，这里就不在多解释了

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();
			}
		});
    }
}

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