The picture flickers when refreshing the adapter in Recyclerview

When we refresh the adapter in the Recyclerview, if the image with rounded corners is loaded in the item, it will flicker.
The Glide loading I used here is based on the introduction of Glide official website,

so we need to rewrite these three methods

public class BTransformation extends BitmapTransformation {
    
    
    private static final String ID = "com.demo.mvp_demo.hilt.BTransformation";
    private static final byte[] ID_BYTES = ID.getBytes(CHARSET);


    private float radius;

    public BTransformation(int radius) {
    
    
        this.radius = radius;
    }


    @Override
    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
    
    
        return cornersImage(pool, toTransform);
    }
    //重写三方法 使得磁盘和缓存 正常工作
    @Override
    public boolean equals(@Nullable Object obj) {
    
    
        return obj instanceof BTransformation;
    }

    @Override
    public int hashCode() {
    
    
        return ID.hashCode();
    }

    @Override
    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {
    
    
        messageDigest.update(ID_BYTES);
    }
    //画圆角
    private Bitmap cornersImage(BitmapPool pool, Bitmap bitmapSource) {
    
    
        Bitmap tempBitmap = null;
        try {
    
    
            if (bitmapSource == null) {
    
    
                return null;
            }
            tempBitmap = pool.get(bitmapSource.getWidth(), bitmapSource.getHeight(),
                    Bitmap.Config.ARGB_8888);
            if (tempBitmap == null) {
    
    
                tempBitmap = Bitmap.createBitmap(bitmapSource.getWidth(),
                        bitmapSource.getHeight(), Bitmap.Config.ARGB_8888);
            }
            Canvas canvas = new Canvas(tempBitmap);
            Paint paint = new Paint();
            paint.setShader(new BitmapShader(bitmapSource, BitmapShader.TileMode.CLAMP,
                    BitmapShader.TileMode.CLAMP));
            paint.setAntiAlias(true);

            RectF rectF = new RectF(0f, 0f, bitmapSource.getWidth(),
                    bitmapSource.getHeight());
            canvas.drawRoundRect(rectF, radius, radius, paint);
        } catch (Exception e) {
    
    
            e.printStackTrace();
        }
        return tempBitmap;
    }
    //画圆
    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
    
    
        if (source == null) return null;
        //获取资源的长宽,获取最小值 子位图的像素个数
        int size = Math.min(source.getWidth(), source.getHeight());
        // 子位图第一个像素在源位图的X坐标
        int x = (source.getWidth() - size) / 2;
        //子位图第一个像素在源位图的y坐标
        int y = (source.getHeight() - size) / 2;
        //创建新位图  source 源位图
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);
        //返回一个正好匹配给定宽、高和配置的只包含透明像素的Bitmap
        // 如果BitmapPool中找不到这样的Bitmap，就返回null
        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        //当返回null 时,创建给定宽、高和配置的新位图
        if (result == null) {
    
    
            result = Bitmap.createBitmap(size, size, Bitmap.Config.ARGB_8888);
        }
        //画图
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        // 设置shader
        paint.setShader(new BitmapShader(squared, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        //抗锯齿
        paint.setAntiAlias(true);
        float r = size / 2f;
        // 用设置好的画笔绘制一个圆
        canvas.drawCircle(r, r, r, paint);
        return result;
    }
}

This way the disk and memory make it work properly.

Activity

		int radius = 30;
        RequestOptions options = new RequestOptions().transform(new BTransformation(radius));
        Glide.with(this).load(url).apply(options).into(iv_main_img);

If the rounded corners implemented by default here need to be rounded, you need to replace the method in the transform with the circleCrop method to achieve. Use the circlecrop method to delete the construction method without passing in the radius. Because you don’t need to use the rounded corners, you need to construct the pass. Parameter radius

Record here