自定义轮播图加小圆点

布局文件引用

Activity调用

 ViewPager bannerViewPager = view.findViewById(R.id.bannerViewPager);
 RecyclerView bannerRecycleView = view.findViewById(R.id.bannerRecycleView);

 List bannerList = new ArrayList<>();
      
new BannerView().setBanner(getActivity(), bannerViewPager, bannerRecycleView, bannerList,     new BannerView.OnClickListener() {
            @Override
            public void cickPostion(int position) {

            }
     });

Banner管理器

package com.xinchengle.xiaokedou.utils.uiutils;

import android.app.Activity;
import android.content.Context;
import android.os.Build;
import android.os.Handler;
import android.os.Message;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Interpolator;
import android.widget.LinearLayout;
import android.widget.Scroller;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import androidx.viewpager.widget.PagerAdapter;
import androidx.viewpager.widget.ViewPager;

import com.bumptech.glide.Glide;
import com.xinchengle.xiaokedou.R;

import java.lang.reflect.Field;
import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

/**
 * Banner 轮播图
 */

public class BannerView {

    public interface OnClickListener {
        void cickPostion(int position);
    }

    private Context context;
    private List list;
    private OnClickListener onClickListener;
    private ViewPager viewPager;
    private final int BANNER_NEXT = 1;

    private Handler handler = new Handler() {
        @Override
        public void handleMessage(@NonNull Message msg) {
            super.handleMessage(msg);
            switch (msg.what) {
                case BANNER_NEXT:
                    int currentItem = viewPager.getCurrentItem();
                    viewPager.setCurrentItem(currentItem + 1);
                    sendMsg();
                    break;
            }
        }
    };

    public void setBanner(Context context, ViewPager vp, RecyclerView recyclerView, List list, BannerView.OnClickListener onClickListener) {
        this.context = context;
        this.list = list;
        this.onClickListener = onClickListener;
        this.viewPager = vp;

        if (list.size() == 0) {
            return;
        }

        //设置展示View
        recyclerView.setLayoutManager(new LinearLayoutManager(context, RecyclerView.HORIZONTAL, false));
        MyDotAdapter myDotAdaoter = new MyDotAdapter();
        recyclerView.setAdapter(myDotAdaoter);

        ViewPagerScroller pagerScroller = new ViewPagerScroller(context);
        pagerScroller.initViewPagerScroll(viewPager);

        MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter();
        viewPager.setAdapter(myViewPagerAdapter);

        //让viewpager的索引默认的指在200
        viewPager.setCurrentItem(200);
        viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
            @Override
            public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {

            }

            @Override
            public void onPageSelected(int position) {
                myDotAdaoter.setCheckPostion(position);
                myDotAdaoter.notifyDataSetChanged();
            }

            @Override
            public void onPageScrollStateChanged(int state) {

            }
        });

        //及时取消viewPager切换事件  防止OOM
        viewPager.setOnTouchListener(new View.OnTouchListener() {
            @Override
            public boolean onTouch(View v, MotionEvent event) {

                switch (event.getAction()) {
                    case MotionEvent.ACTION_DOWN:  //按下
                        handler.removeMessages(BANNER_NEXT);

                    case MotionEvent.ACTION_MOVE:  //移动
                        handler.removeMessages(BANNER_NEXT);

                    case MotionEvent.ACTION_UP:  //抬起
                        handler.removeMessages(BANNER_NEXT);
                        handler.sendEmptyMessageDelayed(BANNER_NEXT, 3000);
                }
                return false;
            }
        });

    }

    //发送轮播请求
    private void sendMsg() {
        handler.sendEmptyMessageDelayed(BANNER_NEXT, 3000);
    }

    //ViewPager适配器
    private class MyViewPagerAdapter extends PagerAdapter {

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

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

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

        @NonNull
        @Override
        public Object instantiateItem(@NonNull ViewGroup container, int position) {

            View inflate = View.inflate(context, R.layout.item_banner_vp_view, null);
            RoundImageView imageView = inflate.findViewById(R.id.roundImage);
            if (!isDestroy((Activity) context)) {
                Glide.with(context).load(list.get(position % list.size())).into(imageView);
            }
            container.addView(inflate);
            inflate.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    if(onClickListener!=null){
                        onClickListener.cickPostion(position % list.size());
                    }
                }
            });

            return inflate;
        }
    }

    /**
     * 判断Activity是否Destroy
     */
    private static boolean isDestroy(Activity mActivity) {
        if (mActivity == null || mActivity.isFinishing() || (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1 && mActivity.isDestroyed())) {
            return true;
        } else {
            return false;
        }
    }

    //小圆点适配器
    private class MyDotAdapter extends RecyclerView.Adapter {

        private int checkPostion;

        public void setCheckPostion(int checkPostion) {
            this.checkPostion = checkPostion;
        }

        @NonNull
        @Override
        public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
            View inflate = View.inflate(context, R.layout.item_banner_recycle_view, null);
            return new ViewHolder(inflate);
        }

        @Override
        public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
            if (position == (checkPostion % list.size())) {
                holder.bannerDot.setBackgroundResource(R.drawable.shape_banner_dot_check);
            } else {
                holder.bannerDot.setBackgroundResource(R.drawable.shape_banner_dot_false);
            }
        }

        @Override
        public int getItemCount() {
            return list.size();
        }

        public class ViewHolder extends RecyclerView.ViewHolder {

            private final LinearLayout bannerDot;

            public ViewHolder(@NonNull View itemView) {
                super(itemView);
                bannerDot = itemView.findViewById(R.id.bannerDot);
            }
        }
    }

    //配置滑动速度
    private class ViewPagerScroller extends Scroller {

        private int mScrollDuration = 800;

        public ViewPagerScroller(Context context) {
            super(context);
        }

        public ViewPagerScroller(Context context, Interpolator interpolator) {
            super(context, interpolator);
        }

        public ViewPagerScroller(Context context, Interpolator interpolator, boolean flywheel) {
            super(context, interpolator, flywheel);
        }

        @Override
        public void startScroll(int startX, int startY, int dx, int dy) {
            super.startScroll(startX, startY, dx, dy, mScrollDuration);
        }

        @Override
        public void startScroll(int startX, int startY, int dx, int dy, int duration) {
            super.startScroll(startX, startY, dx, dy, mScrollDuration);
        }

        public void initViewPagerScroll(ViewPager viewPager) {
            try {
                Field mScroller = ViewPager.class.getDeclaredField("mScroller");
                mScroller.setAccessible(true);
                mScroller.set(viewPager, this);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

    }

}

小圆点选择shape

小圆点未选择shape

ViewPager引用布局（其实就是引用个ImageView，我这是圆角）