youth.Banner2 实现图片圆角 任意角

Banner2： https://github.com/youth5201314/banner

RoundImageView类

public class RoundImageView extends ImageView {

    private int defaultRadius = 0;
    private int radius;
    private int leftTopRadius;
    private int rightTopRadius;
    private int rightBottomRadius;
    private int leftBottomRadius;

    float width,height;

    public RoundImageView(Context context) {
        this(context, null);
    }

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

    public RoundImageView(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        if (Build.VERSION.SDK_INT < 18) {
            setLayerType(View.LAYER_TYPE_SOFTWARE, null);
        }
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);
        width = getWidth();
        height = getHeight();
    }

    @Override
    protected void onDraw(Canvas canvas) {

        leftTopRadius = 24;  //左上角
        rightTopRadius = 24;  //右上角
        rightBottomRadius = 0;  //右下角
        leftBottomRadius = 0;  //左下角

        int maxLeft = Math.max(leftTopRadius, leftBottomRadius);
        int maxRight = Math.max(rightTopRadius, rightBottomRadius);
        int minWidth = maxLeft + maxRight;
        int maxTop = Math.max(leftTopRadius, rightTopRadius);
        int maxBottom = Math.max(leftBottomRadius, rightBottomRadius);
        int minHeight = maxTop + maxBottom;

        if (width >= minWidth && height > minHeight) {
            Path path = new Path();
            path.moveTo(leftTopRadius, 0);
            path.lineTo(width - rightTopRadius, 0);
            path.quadTo(width, 0, width, rightTopRadius);
            path.lineTo(width, height - rightBottomRadius);
            path.quadTo(width, height, width - rightBottomRadius, height);
            path.lineTo(leftBottomRadius, height);
            path.quadTo(0, height, 0, height - leftBottomRadius);
            path.lineTo(0, leftTopRadius);
            path.quadTo(0, 0, leftTopRadius, 0);

            canvas.clipPath(path);
        }
        super.onDraw(canvas);
    }
}

然后在修改ImageAdapter类

public class ImageAdapter extends BannerAdapter<DataBean, ImageAdapter.BannerViewHolder> {

    public ImageAdapter(List<DataBean> mDatas) {
        super(mDatas);
    }

    @Override
    public BannerViewHolder onCreateHolder(ViewGroup parent, int viewType) {
        RoundImageView imageView = new RoundImageView(parent.getContext());
        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(BannerViewHolder holder, DataBean data, int position, int size) {
        holder.imageView.setImageResource(data.imageRes);
    }

    class BannerViewHolder extends RecyclerView.ViewHolder {
        RoundImageView imageView;

        public BannerViewHolder(@NonNull RoundImageView view) {
            super(view);
            this.imageView = view;
        }
    }
}