Android 轮换页面+TabHost 实例

package com.huarui.my12android2502;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.app.TabActivity;
import android.os.Bundle;
import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v4.view.ViewPager.OnPageChangeListener;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TabHost;
import android.widget.TabHost.OnTabChangeListener;
import android.widget.TabHost.TabSpec;

public class MainActivity extends TabActivity {
    
    //v
    //页面轮换控件
    private ViewPager vp;
    private TabHost tabHost;
    //m 保存一下页面的ID
    private int[] pageids = new int[]{
            R.layout.view1,
            R.layout.view2,
            R.layout.view3
    };
    //c 适配器
    private PagerAdapter adapter;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        initview();
    }

    private void initview() {
        setContentView(R.layout.activity_main);
        initViewpager();
        
        tabHost = this.getTabHost();
        addtab("0","第一页");
        addtab("1","第二页");
        addtab("2","第三页");
        
        //当tab的选中改变之后 我要触发一个事件
        
        tabHost.setOnTabChangedListener(new OnTabChangeListener() {
            
            @Override
            //tab 选中改变会触发这个方法
            //tabId
            public void onTabChanged(String tabId) {
                // TODO Auto-generated method stub
                //拿到了选中的tab的小标
                int tabindex = Integer.parseInt(tabId);
                //让视图轮换控价 显示第 tabindex的图
                vp.setCurrentItem(tabindex);
                
            }
        });
    }

    private void addtab(String tag,String title) {
        TabSpec spec = tabHost.newTabSpec(tag);
        spec.setIndicator(title);
        spec.setContent(R.id.tab1);
        tabHost.addTab(spec);
    }

    private void initViewpager() {
        //v
        vp = (ViewPager) findViewById(R.id.vp);
        //m
        //c
        adapter = new MyPageAdapter();
        //vc
        vp.setAdapter(adapter);
        //当滑动轮换控件 改变页面的时候 会触发该事件
        vp.setOnPageChangeListener(new OnPageChangeListener() {
            
            @Override
            //position 选中页面的下标
            public void onPageSelected(int position) {
                // TODO Auto-generated method stub
                
                tabHost.setCurrentTab(position);
                
            }
            
            @Override
            public void onPageScrolled(int position, float positionOffset,
                    int positionOffsetPixels) {
                // TODO Auto-generated method stub
                
            }
            
            @Override
            public void onPageScrollStateChanged(int state) {
                // TODO Auto-generated method stub
                
            }
        });
    }
    
    private class MyPageAdapter extends PagerAdapter{
        
        private List<View> vs;
        
        public MyPageAdapter(){
            vs = new ArrayList<View>();
            for (int i=0;i<pageids.length;i++) {
                View view = View.inflate(MainActivity.this, pageids[i], null);
                vs.add(view);
            }
            
        }

        @Override
        //告诉适配器 要轮换的页面总共有多少
        public int getCount() {
            // TODO Auto-generated method stub
            return pageids.length;
        }

        @Override
        public boolean isViewFromObject(View view, Object object) {
            // TODO Auto-generated method stub
            //谷歌要求这么写
            return view==object;
        }

        @Override
        //初始化一个条目   (这个方法需要自己添加进来 方法: 右键-Source—Override/...-找到这个方法勾上确定)
        //container 就是viewpager 本身
        //position 马上要出来的视图的下表
        public Object instantiateItem(ViewGroup container, int position) {
            // TODO Auto-generated method stub
            //return super.instantiateItem(container, position);
            //View view = View.inflate(MainActivity.this, pageids[position], null);
            //把视图 加到 轮换容器中去
            container.addView(vs.get(position));
            //把加进去的视图 作为 返回值返回
            return vs.get(position);
        }

        @Override
        //销毁条目   (这个方法需要自己添加进来 方法: 右键-Source—Override/...-找到这个方法勾上确定)
        //container 容器本身
        //position 要销毁的view的下标
        //object 即将销毁的page
        public void destroyItem(ViewGroup container, int position, Object object) {
            // TODO Auto-generated method stub
            //super.destroyItem(container, position, object);
            container.removeView((View)object);
            
        }
        
        
        
    }

    
}