Viewpager制作自动左右循环滑动

1、布局文件，framlaout包含两层：viewpager+小点点

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >
    <FrameLayout
        android:layout_width="fill_parent"
        android:layout_height="120dp" >
        <android.support.v4.view.ViewPager
            android:id="@+id/Pager"
            android:layout_width="fill_parent"
            android:layout_height="120dp"
            android:layout_gravity="center"
            android:flipInterval="30"
            android:persistentDrawingCache="animation" />
        <LinearLayout
            android:id="@+id/viewGroup"
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:layout_gravity="bottom"
            android:orientation="horizontal" >
        </LinearLayout>

    </FrameLayout>

</RelativeLayout>

2、主代码

    // Views动态数组,装载图片，views.add(imaV);
    private List<View> views;
    // 滑动控件
    private ViewPager pager;
     // 装载小点指示器
    private ViewGroup group;
.................................
        initViewPager();
        setpagerListener();
................................
private void initViewPager() {
        // TODO Auto-generated method stub
        pager = (ViewPager) view.findViewById(R.id.Pager);
        group = (ViewGroup) view.findViewById(R.id.viewGroup);
        LayoutParams params = new LayoutParams(LayoutParams.MATCH_PARENT,
                LayoutParams.MATCH_PARENT);
        ImageView imaV;
        int[] ids = { R.drawable.pic1, R.drawable.pic2, R.drawable.pic3 };
        views = new ArrayList<View>();
        for (int i = 0; i < ids.length; i++) {
            imaV = new ImageView(getActivity());
            imaV.setImageResource(ids[i]);

            imaV.setLayoutParams(params);
            imaV.setScaleType(ScaleType.FIT_XY);
            views.add(imaV);
        }
        for (int i = 0; i < ids.length; i++) {
            imaV = new ImageView(getActivity());
            imaV.setLayoutParams(new LayoutParams(12, 12));
            if (i == 0) {
                imaV.setBackgroundResource(R.drawable.page_indicator_focused);
            } else {
                imaV.setBackgroundResource(R.drawable.page_indicator_unfocused);
            }
            group.addView(imaV);
        }
        pager.setAdapter(new MyAdapter(views));
        //当前页设置为很大才可以左滑
        pager.setCurrentItem((views.size()) * 100);
    }

    /**
     * 设置选中的tip的背景
     * 
     * @param selectItems
     */
    private void setImageBackground(int selectItems) {
        for (int i = 0; i < group.getChildCount(); i++) {
            if (i == selectItems) {
                group.getChildAt(i).setBackgroundResource(
                        R.drawable.page_indicator_focused);
            } else {
                group.getChildAt(i).setBackgroundResource(
                        R.drawable.page_indicator_unfocused);
            }
        }
    }
.............................................
private void setpagerListener() {
        // TODO Auto-generated method stub
        pager.setOnPageChangeListener(new OnPageChangeListener() {
            /**
             * onPageSelected:每次切换页面就会执行 在此实现圆点指示器以及在最后页面显示button
             */
            @Override
            public void onPageSelected(int arg0) {
                // TODO Auto-generated method stub
                setImageBackground(arg0 % views.size());
            }

            /**
             * 当页面在滑动的时候会调用此方法，在滑动被停止之前，此方法回得到调用。 其中三个参数的含义分别为：
             * 
             * arg0 :当前页面，及你点击滑动的页面
             * 
             * arg1:当前页面偏移的百分比
             * 
             * arg2:当前页面偏移的像素位置
             */
            @Override
            public void onPageScrolled(int arg0, float arg1, int arg2) {
                // TODO Auto-generated method stub
            }

            @Override
            public void onPageScrollStateChanged(int arg0) {
                // TODO Auto-generated method stub
            }
        });

    }

3、适配器

import java.util.List;

import android.support.v4.view.PagerAdapter;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.View;

public class MyAdapter extends PagerAdapter {

    private List<View> views;

    public MyAdapter(List<View> views) {
        this.views = views;
    }

    // destroyItem，getCount,instantiateItem实现循环滑动
    @Override
    public void destroyItem(View arg0, int arg1, Object arg2) {
        // ((ViewPager) arg0).removeView(views.get(arg1 % views.size()));
    }

    /*
     * (non-Javadoc)
     * 
     * @see android.support.v4.view.PagerAdapter#getCount() 这样才可以一直滑
     */
    @Override
    public int getCount() {
        return Integer.MAX_VALUE;
    }

    /*
     * (non-Javadoc)
     * 
     * @see
     * android.support.v4.view.PagerAdapter#instantiateItem(android.view.View,
     * int) 如果出现错误不会fc，而是在catch里面处理，实现左滑
     */
    @Override
    public Object instantiateItem(View arg0, int arg1) {
        Log.e("tag", "instantiateItem = " + arg1);
        try {
            ((ViewPager) arg0).addView(views.get(arg1 % views.size()), 0);
        } catch (Exception e) {
            // handler something
        }
        return views.get(arg1 % views.size());
    }

    @Override
    public boolean isViewFromObject(View arg0, Object arg1) {
        // TODO Auto-generated method stub
        return false;
    }

}

4、实现自动切换图片.

    ScheduledExecutorService scheduledExecutorService;
................................
    @Override
    public void onStart() {
        // TODO Auto-generated method stub
        scheduledExecutorService = Executors.newSingleThreadScheduledExecutor();
        // 当Activity显示出来后，每6秒切换一次图片
        // scheduleAtFixedRate安排所提交的Runnable任务按指定的间隔重复执行
        scheduledExecutorService.scheduleAtFixedRate(new ScrollTask(), 1, 6,
                TimeUnit.SECONDS);
        super.onStart();
    }

    @Override
    public void onStop() {
        // 当Activity不可见的时候停止切换
        scheduledExecutorService.shutdown();
        super.onStop();
    }

Done！