轮播

//-------------onCreate中------------------------
//找到控件
view_pager = (ViewPager) findViewById(R.id.view_pager);
//设置适配器
adapter = new BannerAdapter(views);
view_pager.setAdapter(adapter);
//初始化view
initView();
//轮播
lunbo();
//设置默认页
view_pager.setCurrentItem(0);


//---------------轮播------------------------

//轮播
    private void lunbo() {
        //使用Timer发送延迟消息
        Timer timer=new Timer();
        TimerTask task=new TimerTask() {
            int count=0;
            @Override
            public void run() {
                int a=count++;
                handler.sendEmptyMessage(a);
            }
        };
        timer.schedule(task,1000,1000);
    }
//---------------初始化view----------------------
//初始化view
    private void initView() {
        View view1=View.inflate(this,R.layout.item_pager1,null);
        View view2=View.inflate(this,R.layout.item_pager2,null);
        View view3=View.inflate(this,R.layout.item_pager3,null);
        View view4=View.inflate(this,R.layout.item_pager4,null);
        views.add(view1);
        views.add(view2);
        views.add(view3);
        views.add(view4);

    }

//--------------Handler---------------------

private Handler handler=new Handler(){
        @Override
        public void handleMessage(Message msg) {
view_pager.setCurrentItem(msg.what);

        }
    };

//===============创建一个类继承pageradapter====并实现以下方法================

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

    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

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

    @Override
    public Object instantiateItem(ViewGroup container, int position) {
        View view=views.get(position%views.size());
        container.addView(view);
        return view;
    }

    @Override
    public void destroyItem(ViewGroup container, int position, Object object) {
        container.removeView((View) object);
    }