Android Banner2.1.0

由于最近更新了studio，好多东西需要更新，那就彻底一点吧，banner原来用的1.4.9的，新版的更新了好多，之前的方法不能用了，不多说直接上代码。

依赖：

implementation 'com.youth.banner:banner:2.1.0'  

<com.youth.banner.Banner
    android:id="@+id/banner_index"
    android:layout_width="match_parent"
    android:layout_height="150dp" />  

宽高根据你情况设置。

banner.addBannerLifecycleObserver(this)
        .setAdapter(new ImageAdapter(list))
        .setIndicator(new CircleIndicator(this));  

实体类，考虑到你的图片类型可能是Sting，也可能是int类型，所以我用了object，下面代码可直接复制。

public class ImageBean {
    Object img;

    public ImageBean(Object img) {
        this.img = img;
    }

    public ImageBean() {
    }

    public Object getImg() {
        return img;
    }

    public void setImg(Object img) {
        this.img = img;
    }

    @Override
    public String toString() {
        return "ImageBean{" +
                "img=" + img +
                '}';
    }
}


适配器，可直接复制。  

public class ImageAdapter extends BannerAdapter<ImageBean, ImageAdapter.BannerViewHolder> {
    Context context;

    public ImageAdapter(List<ImageBean> datas) {
        super(datas);
    }

    @Override
    public ImageAdapter.BannerViewHolder onCreateHolder(ViewGroup parent, int viewType) {
        context = parent.getContext();
        ImageView imageView = new ImageView(parent.getContext());
        //注意，必须设置为match_parent，这个是viewpager2强制要求的
        imageView.setLayoutParams(new ViewGroup.LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
        return new BannerViewHolder(imageView);
    }

    @Override
    public void onBindView(ImageAdapter.BannerViewHolder holder, ImageBean data, int position, int size) {
//        holder.imageView.setImageResource(data.getImg());
        Glide.with(context).load(data.getImg()).into(holder.imageView);
    }

    public class BannerViewHolder extends RecyclerView.ViewHolder {
        private final ImageView imageView;

        public BannerViewHolder(@NonNull ImageView itemView) {
            super(itemView);
            this.imageView = itemView;
        }
    }
}
  

源码连接：https://github.com/youth5201314/banner