Android 无限循环且支持自动滚动的ViewPager

无限循环思路：

1. 添加最后一条数据到第一条，添加第一条数据到最后一条； 

2.滚动到最后一页，自动跳到第二页（视觉上的第一页），滚动到第一页，自动跳转至倒数第二页（视觉上最后一页）;

3.初始设置滚动到第二页（视觉上的第一页）；

自动滚动思路：

使用定时器自动向右滚动。

具体实现

public class LoopPagerAdapter extends PagerAdapter implements ViewPager.OnPageChangeListener {    private static final String TAG = "LoopPagerAdapter";    private Context context;    /**是否循环*/    private boolean isLoop;    /**viewpager*/    private ViewPager viewPager;    /**view布局文件*/    private List<Integer> resources;    /**View数据源*/    private List<View> views;    /**当前页面*/    private int currentPosition = 0;    /**定时器*/    private Timer timer;    private MyHandler handler;    /**     *     * @param context 上下文     * @param resources view布局列表     * @param vp viewpager     */    public LoopPagerAdapter(Context context, List<Integer> resources, ViewPager vp){        this.context = context;        this.resources = resources;        this.viewPager = vp;        init();    }    /**     *     * @param context 上下文     * @param resources view布局列表     * @param isLoop 是否循环滚动     * @param vp viewpager     */    public LoopPagerAdapter(Context context, List<Integer> resources, boolean isLoop, ViewPager vp){        this.context = context;        this.context = context;        this.resources = resources;        this.isLoop = isLoop;        this.viewPager = vp;        addLoopViews();        init();    }    private void addLoopViews(){        if(views == null){            views = new ArrayList<>();        }        LayoutInflater inflater = LayoutInflater.from(context);        for(Integer id : resources){            views.add(inflater.inflate(id, null));        }        int size = views.size();        //如果不是循环，view数量只有1个，则不处理        if(!isLoop || size <= 1){            return;        }        //第一页view        View firstView = inflater.inflate(resources.get(0), null);        //尾页view        View endView = inflater.inflate(resources.get(size-1), null);        //添加一个尾页到第一页        views.add(0, endView);        //添加一个首页到最后一页        views.add(firstView);    }    private void init(){        viewPager.setAdapter(this);        viewPager.addOnPageChangeListener(this);        viewPager.setCurrentItem(1, false);    }    @Override    public int getCount() {        return views.size();    }    @Override    public boolean isViewFromObject(View view, Object object) {        return view == object;    }    @Override    public Object instantiateItem(ViewGroup container, int position) {        View view = views.get(position);        container.addView(view);        return views.get(position);    }    @Override    public void destroyItem(ViewGroup container, int position, Object object) {        container.removeView(views.get(position));    }    @Override    public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {    }    @Override    public void onPageSelected(int position) {        this.currentPosition = position;    }    @Override    public void onPageScrollStateChanged(int state) {        //如果还在滑动中或非循环不做处理        if(state != ViewPager.SCROLL_STATE_IDLE || !isLoop){            return;        }        //如果当前页面为第一张，则设置页面为倒数第二张        if(currentPosition == 0){            viewPager.setCurrentItem(views.size()-2, false);        }else if(currentPosition == views.size() - 1){//若当前为倒数第一张，设置页面为第二张            viewPager.setCurrentItem(1, false);        }    }    /**     * 开始自动滚动     * @param delay 等待时间     * @param period 间隔时间     */    public void startAutoScrollPage(long delay, long period){        handler = new MyHandler(this);        timer = new Timer();        timer.schedule(new MyTask(this), delay, period);    }    /**     * 停止自动滚动     */    public void stopAutoScrollPage(){        if(timer != null){            timer.cancel();        }        if(handler != null){            handler.removeCallbacksAndMessages(null);        }    }    /**     * 自动滚动handler     */    private static class MyHandler extends Handler {        private WeakReference<LoopPagerAdapter> weakReference;        public MyHandler(LoopPagerAdapter adapter){            weakReference  = new WeakReference<>(adapter) ;        }        @Override        public void handleMessage(Message msg) {            if(weakReference.get() == null){                return;            }            LoopPagerAdapter adapter = weakReference.get();            adapter.viewPager.arrowScroll(adapter.viewPager.FOCUS_RIGHT);        }    }    /**     * 定时器     */    private static class MyTask extends TimerTask {        private WeakReference<LoopPagerAdapter> weakReference;        public MyTask(LoopPagerAdapter adapter){            weakReference  = new WeakReference<>(adapter);        }        @Override        public void run() {            if(weakReference.get() == null){                return;            }            LoopPagerAdapter adapter = weakReference.get();            adapter.handler.sendMessage(new Message());        }    }}

使用

vp = (ViewPager) findViewById(R.id.activity_main_vp);        List<Integer> ids = new ArrayList<>();        ids.add(R.layout.view_vp1);        ids.add(R.layout.view_vp2);        ids.add(R.layout.view_vp3);        LoopPagerAdapter adapter = new LoopPagerAdapter(getApplicationContext(), ids, true, vp);        adapter.startAutoScrollPage(3000, 3000);

效果