自动滚动的ViewPager

效果图：

使用方法：

AutoScrollViewPager viewPager = (AutoScrollViewPager) findViewById(R.id.vp_photos);

viewPager.setDataList(mUrlList);
viewPager.updateView(0);
viewPager.setIsAutoScroll(true);
viewPager.setIsShowDot(true);

步骤一：在value的attrs.xml文件里添加自定义样式

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <declare-styleable name="AutoScrollViewPager">
        <attr name="autoscroll" format="boolean" />
        <attr name="show_navgation_dot" format="boolean" />
    </declare-styleable>
</resources>

步骤二：

添加 Android-Universal-Image-Loader Jar包（当然也可以用其他的加载网络图片工具）

步骤三：自定义view

/**
 * Created by pengkv on 15/12/5.
 */
public class AutoScrollViewPager extends FrameLayout implements View.OnClickListener {
    private Context mContext;
    private List<String> mDataList;//图片地址集合
    private int mBofPosition;
    private boolean isShowDot;//是否显示小点
    private boolean isAutoScroll;//是否自动滚动
    private List<View> mViewList;
    private ViewPager mViewPager;
    private LinearLayout mDotLayout;//放置小点的容器
    private MyPagerAdapter mPagerAdapter;
    private ViewPagerRollHelper mRollHelper;//控制滚动的工具类
    private ViewPager.LayoutParams mImageParams;//图片的布局参数
    private LinearLayout.LayoutParams mDotParams;//小点的布局参数
    private FrameLayout.LayoutParams mViewPagerParams;//ViewPager的布局参数
    private FrameLayout.LayoutParams mDotLayoutParams;//放置小点容器的布局参数


    public AutoScrollViewPager(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public AutoScrollViewPager(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        TypedArray array = mContext.obtainStyledAttributes(attrs, R.styleable.AutoScrollViewPager, defStyleAttr, 0);
        isAutoScroll = array.getBoolean(R.styleable.AutoScrollViewPager_autoscroll, true);
        isShowDot = array.getBoolean(R.styleable.AutoScrollViewPager_show_navgation_dot, true);
        array.recycle();
    }


    public void setIsAutoScroll(boolean isAutoScroll) {
        this.isAutoScroll = isAutoScroll;
    }

    public void setIsShowDot(boolean isShowDot) {
        this.isShowDot = isShowDot;
    }

    public void setDataList(List<String> mDataList) {
        this.mDataList = mDataList;
        initView();
    }

    private void initView() {
        mViewList = new ArrayList<>();

        //初始化图片布局参数
        mImageParams = new ViewPager.LayoutParams();
        mImageParams.width = ViewGroup.LayoutParams.MATCH_PARENT;
        mImageParams.height = ViewGroup.LayoutParams.MATCH_PARENT;

        //初始化小点布局参数
        int size = mContext.getResources().getDimensionPixelSize(R.dimen.five_dp);
        mDotParams = new LinearLayout.LayoutParams(size, size);
        mDotParams.setMargins(5, 0, 5, 0);

        //初始化ViewPager布局参数
        mViewPagerParams = new LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT);

        //初始化ViewPager
        mPagerAdapter = new MyPagerAdapter(mViewList);
        mViewPager = new ViewPager(mContext);
        mViewPager.setLayoutParams(mViewPagerParams);
        mViewPager.setAdapter(mPagerAdapter);
        mViewPager.addOnPageChangeListener(new MyPagerOnScrollChangeListener());

        //加载ViewPager
        addView(mViewPager);

        if (isShowDot) {
            int height = mContext.getResources().getDimensionPixelOffset(R.dimen.twenty_dp);
            mDotLayoutParams = new LayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, height);
            mDotLayoutParams.gravity = Gravity.BOTTOM | Gravity.CENTER;

            mDotLayout = new LinearLayout(mContext);
            mDotLayout.setLayoutParams(mDotLayoutParams);
            mDotLayout.setOrientation(LinearLayout.HORIZONTAL);
            mDotLayout.setGravity(Gravity.CENTER);
            addView(mDotLayout);
        }

    }

    public void updateView(int position) {
        if (null != mDotLayout) {
            mDotLayout.removeAllViews();
        }

        if (null != mViewList) {
            int length = mDataList.size();
            int viewLength = mViewList.size();

            for (int i = 0; i < length; i++) {
                String imgUrl = mDataList.get(i);
                ImageView view;

                if (i < viewLength) {//取以前的View
                    view = (ImageView) mViewList.get(i);
                } else {//新增View
                    view = new ImageView(mContext);
                    view.setLayoutParams(mImageParams);
                    mViewList.add(view);
                }

                view.setScaleType(ImageView.ScaleType.CENTER_CROP);
                view.setOnClickListener(this);

                //初始化加载图片框架
                ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(mContext)
                        .threadPriority(Thread.NORM_PRIORITY - 2)// 线程优先级
                        .denyCacheImageMultipleSizesInMemory()
                        .tasksProcessingOrder(QueueProcessingType.LIFO)
                        .memoryCache(new LruMemoryCache(3 * 1024 * 1024))
                        .memoryCacheSize(3 * 1024 * 1024)
                        .build();
                ImageLoader.getInstance().init(config);

                //下载图片－－》这里可以替换成自己想要的加载图片工具
                ImageLoader.getInstance().displayImage(imgUrl, view);

                //添加小点视图
                if (isShowDot) {
                    ImageView dot = new ImageView(mContext);
                    dot.setImageResource(R.drawable.dot);
                    dot.setLayoutParams(mDotParams);

                    if (i == 0)
                        dot.setSelected(true);

                    mDotLayout.addView(dot);
                }

            }

            //控制ViewPager的滚动
            setCurrentItem(position);
            mPagerAdapter.notifyDataSetChanged();
            mRollHelper = new ViewPagerRollHelper(mViewPager, mPagerAdapter);
            mRollHelper.setAutoScroll(isAutoScroll);
            mRollHelper.autoScroll();
        }


    }


    public void setCurrentItem(int position) {
        mViewPager.setCurrentItem(position);
    }

    public int getCurrentItem() {
        return mViewPager.getCurrentItem();
    }


    @Override
    public void onClick(View v) {
    }


    //ViewPager适配器：加载图片
    private 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 void destroyItem(ViewGroup container, int position, Object object) {
            container.removeView(viewList.get(position));
        }

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


    //页面滚动监听器：主要是为了控制小点的显示
    private class MyPagerOnScrollChangeListener implements ViewPager.OnPageChangeListener {
        @Override
        public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
        }

        @Override
        public void onPageSelected(int position) {
            mRollHelper.setPagerChangeEvent(position);
            if (isShowDot) {
                View view = mDotLayout.getChildAt(position);
                View befView = mDotLayout.getChildAt(mBofPosition);
                view.setSelected(true);
                befView.setSelected(false);
                mBofPosition = position;
            }
        }

        @Override
        public void onPageScrollStateChanged(int state) {
        }
    }


}

步骤四：添加辅助类

/**
 * Created by pengkv on 15/12/5.
 */
public class ViewPagerRollHelper {
    private ViewPager mViewPager = null;
    private PagerAdapter mPagerAdapter = null;
    private int newPosition, oldPosition, maxPosition;
    private boolean isAutoScroll = true;
    private static final int CHANGE_ADS = 0;//切换的参数
    private Timer mTimer = null;
    private MyTimertask myTimertask = null;


    public ViewPagerRollHelper(ViewPager viewPager, PagerAdapter pagerAdapter) {
        mViewPager = viewPager;
        mPagerAdapter = pagerAdapter;
    }


    //控制ViewPager的当前位置
    Handler handler = new Handler() {
        @Override
        public void handleMessage(Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case CHANGE_ADS:
                    newPosition = (Integer) msg.obj;
                    mViewPager.setCurrentItem(newPosition);
                    break;
            }
        }
    };


    //自动滚动
    public void autoScroll() {
        //获取页面个数
        maxPosition = mPagerAdapter.getCount() - 1;

        if (isAutoScroll && maxPosition > 0) {
            if (mTimer != null) {
                mTimer.cancel();
                mTimer = null;
            }

            mTimer = new Timer();

            if (myTimertask != null) {
                myTimertask.cancel();
                myTimertask = null;
            }

            if (null == myTimertask)
                myTimertask = new MyTimertask();

            mTimer.schedule(myTimertask, 3000, 3000);
        }

    }


    //设置页面变更事件
    public void setPagerChangeEvent(int curIndex) {
        newPosition = curIndex;
        oldPosition = newPosition - 1;
        autoScroll();
    }

    //发送位置变更信息
    class MyTimertask extends TimerTask {

        @Override
        public void run() {
            if (newPosition >= 0 && newPosition < maxPosition) {//自动翻下一页
                newPosition += 1;
            } else if (newPosition == maxPosition) {//在最后一页
                newPosition = 0;
            }

            Message message = handler.obtainMessage();
            message.what = CHANGE_ADS;
            message.obj = newPosition;
            handler.sendMessage(message);
        }

    }

    public void setAutoScroll(boolean isAutoScroll) {
        this.isAutoScroll = isAutoScroll;
    }
}