Tab widget用法

package com.yarin.android.Examples_04_29;
 
import android.app.AlertDialog;
import android.app.Dialog;
import android.app.TabActivity;
import android.content.DialogInterface;
import android.graphics.Color;
import android.os.Bundle;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
 
public class Activity01 extends TabActivity
{
    //声明TabHost对象
    TabHost mTabHost;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
         
        //取得TabHost对象
        mTabHost = getTabHost();
         
        /* 为TabHost添加标签 */
        //新建一个newTabSpec(newTabSpec)
        //设置其标签和图标(setIndicator)
        //设置内容(setContent)
        mTabHost.addTab(mTabHost.newTabSpec("tab_test1")
                .setIndicator("TAB 1",getResources().getDrawable(R.drawable.img1))
                .setContent(R.id.textview1));
        mTabHost.addTab(mTabHost.newTabSpec("tab_test2")
                .setIndicator("TAB 2",getResources().getDrawable(R.drawable.img2))
                .setContent(R.id.textview2));
        mTabHost.addTab(mTabHost.newTabSpec("tab_test3")
                .setIndicator("TAB 3",getResources().getDrawable(R.drawable.img3))
                .setContent(R.id.textview3));
         
        //设置TabHost的背景颜色
        mTabHost.setBackgroundColor(Color.argb(150, 22, 70, 150));
        //设置TabHost的背景图片资源
        //mTabHost.setBackgroundResource(R.drawable.bg0);
         
        //设置当前显示哪一个标签
        mTabHost.setCurrentTab(0);
         
        //标签切换事件处理，setOnTabChangedListener
        mTabHost.setOnTabChangedListener(new OnTabChangeListener()
        {
            // TODO Auto-generated method stub
            @Override
            public void onTabChanged(String tabId)
            {
                Dialog dialog = new AlertDialog.Builder(Activity01.this)
                        .setTitle("提示")
                        .setMessage("当前选中："+tabId+"标签")
                        .setPositiveButton("确定",
                        new DialogInterface.OnClickListener()
                        {
                            public void onClick(DialogInterface dialog, int whichButton)
                            {
                                dialog.cancel();
                            }
                        }).create();//创建按钮
               
                dialog.show();
            }           
        });
    }
}