使用Glide改变图片的圆角

1.先看以下是不是您想要的效果（四个角都是圆角，以下还有左上，右上角的圆角），同时还附带预加载以及加载失败图片的效果

2.使用Glide之前我们先引入依赖

implementation 'com.github.bumptech.glide:glide:4.9.0'

3.然后创建一个改变圆角的GildeRoundTransform类

public class GlideRoundTransform extends BitmapTransformation {
    private static float radius = 0f;

    public GlideRoundTransform() {
        this(4);
    }

    public GlideRoundTransform(int dp) {
        super();
        this.radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }


    @Override
    protected Bitmap transform(@NonNull BitmapPool pool, @NonNull Bitmap toTransform, int outWidth, int outHeight) {
        //变换的时候裁切
        Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, bitmap);
    }

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {

    }


    private static Bitmap roundCrop(BitmapPool pool, Bitmap source) {
        if (source == null) {
            return null;
        }
        Bitmap result = pool.get(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(source.getWidth(), source.getHeight(), Bitmap.Config.ARGB_8888);
        }
        Canvas canvas = new Canvas(result);
        Paint paint = new Paint();
        paint.setShader(new BitmapShader(source, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
        paint.setAntiAlias(true);
        RectF rectF = new RectF(0f, 0f, source.getWidth(), source.getHeight());
        canvas.drawRoundRect(rectF, radius, radius, paint);
        //左上角、右上角圆角
//        RectF rectRound = new RectF(0f, 100f, source.getWidth(), source.getHeight());
//        canvas.drawRect(rectRound, paint);
        return result;
    }
}

4.然后在需要的地方引用

RequestOptions options = new RequestOptions()
                .centerCrop()
                .placeholder(R.mipmap.ic_launcher_round) //预加载图片
                .error(R.drawable.ic_launcher_foreground) //加载失败图片
                .priority(Priority.HIGH) //优先级
                .diskCacheStrategy(DiskCacheStrategy.NONE) //缓存
                .transform(new GlideRoundTransform(5)); //圆角
Glide.with(context).load(list.get(position).getImage()).apply(options).into(holder.imageView);

5.在GlideRoundTransform类中42、43行，改变左下角，右下角为直角的效果，附上效果图