安卓使用viewpager

view pager是安卓3.0引入的一个页面容器组件，用于手势滑动切换页面，常常用于页面导航或者图片轮播。view pager的最主要的是一个viewadapter适配器。我们来通过代码具体看

    private myFriend friend;
    private myMap map;
    private myAbout about;
    private View viewfriend;
    private View viewmap;
    private View viewmine;
    private ViewPager viewPager;//viewpager
    private List<View> viewList=new ArrayList<View>();//把需要滑动的页卡添加到这个list中
    private LinearLayout btnFriend;
    private LinearLayout btnMap;
    private LinearLayout btnMine;

    btnFriend = (LinearLayout) findViewById(R.id.main_btn_Friend);
        btnMap=(LinearLayout)findViewById(R.id.main_btn_Map);
        btnMine=(LinearLayout)findViewById(R.id.main_btn_mine);
        viewPager=(ViewPager)findViewById(R.id.main_main);

        viewfriend=View.inflate(this,R.layout.activity_my_friend,null);
        viewmap=View.inflate(this,R.layout.activity_my_map,null);
        viewmine=View.inflate(this,R.layout.activity_my_mine,null);
        viewList.add(viewfriend);
        viewList.add(viewmap);
        viewList.add(viewmine);
    myPagerAdapter adapter=new myPagerAdapter(viewList);
        viewPager.setAdapter(adapter);
        viewPager.setCurrentItem(1);
        btnMap.setOnClickListener(new View.OnClickListener() {//通过底部导航栏来实现页面的切换
            @Override
            public void onClick(View v) {
                viewPager.setCurrentItem(1);
            }
        });
        btnFriend.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                viewPager.setCurrentItem(0);
            }
        });
        btnMine.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                viewPager.setCurrentItem(2);
            }
        });

public class myPagerAdapter extends PagerAdapter {
    private List<View> viewList;
    public myPagerAdapter(List<View> viewList)
    {
        this.viewList = viewList;
    }

    @Override
    public int getCount() {
        return viewList.size();
    }

    @Override
    public boolean isViewFromObject(View view, Object object) {
        return view == object;
    }

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View v=viewList.get(position);
        ViewGroup parent = (ViewGroup) v.getParent();
        if (parent != null) {
            parent.removeAllViews();
        }
        container.addView(viewList.get(position));

        return viewList.get(position);
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        //super.destroyItem(container, position, object);
        container.removeView(viewList.get(position));
        //container.removeView(viewList.get(position));
    }

}

流程如下：首先初始化你需要添加的页面，加入到list中，然后初始适配器，并设置view pager的适配器。mypageradapter是一个自定义的类，继承与pageradapter，并重写了几个方法，以适应项目要求。