支持所有角的圆角，自动计算合适的半径，不用担心图片比预定值小导致的圆角过大的问题

修改自：https://blog.csdn.net/qq_15059163/article/details/97613790
增加了指定图片尺寸、解决了图片某些情况下圆角过大的问题

public class GlideRoundCornersTransUtils implements Transformation<Bitmap> {private BitmapPool mBitmapPool;private int mRadius;//半径private int mDiameter;//直径private CornerType mCornerType = CornerType.ALL;private DisplayMetrics metrics;int width, height;public GlideRoundCornersTransUtils(Context context, int radius, CornerType type, int width, int height) {mBitmapPool = Glide.get(context).getBitmapPool();metrics = context.getResources().getDisplayMetrics();mRadius = (int) (radius * (metrics.densityDpi / 160f));mCornerType = type;mDiameter = 2 * mRadius;this.width = width;this.height = height;}public enum CornerType {/*** 所有角*/ALL,/*** 左上*/LEFT_TOP,/*** 左下*/LEFT_BOTTOM,/*** 右上*/RIGHT_TOP,/*** 右下*/RIGHT_BOTTOM,/*** 左侧*/LEFT,/*** 右侧*/RIGHT,/*** 下侧*/BOTTOM,/*** 上侧*/TOP,}@Overridepublic Resource<Bitmap> transform(Resource<Bitmap> resource, int outWidth, int outHeight) {Bitmap source = resource.get();// 剪裁图片到指定的尺寸Bitmap croppedBitmap = cropBitmap(source, width, height);int width = croppedBitmap.getWidth();int height = croppedBitmap.getHeight();Bitmap bitmap = mBitmapPool.get(width, height, Bitmap.Config.ARGB_8888);if (bitmap == null) {bitmap = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);}Canvas canvas = new Canvas(bitmap);Paint paint = new Paint();paint.setAntiAlias(true);paint.setShader(new BitmapShader(croppedBitmap, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP));drawRoundRect(canvas, paint, width, height);return BitmapResource.obtain(bitmap, mBitmapPool);}private Bitmap cropBitmap(Bitmap source, int targetWidth, int targetHeight) {int sourceWidth = source.getWidth();int sourceHeight = source.getHeight();float srcRatio = (float) sourceWidth / sourceHeight;float targetRatio = (float) targetWidth / targetHeight;int width, height;if (srcRatio > targetRatio) {// 源图片更宽，需要剪裁宽度width = (int) (sourceHeight * targetRatio);height = sourceHeight;} else {// 源图片更高，需要剪裁高度width = sourceWidth;height = (int) (sourceWidth / targetRatio);}// 计算剪裁的起始点int x = (sourceWidth - width) / 2;int y = (sourceHeight - height) / 2;//计算当前适合的半径、直径，因为当前图片的宽高有可能比预定值小，因此，半径、直径也要跟着缩小mRadius=mRadius*width/targetWidth;mDiameter=mDiameter*width/targetWidth;// 剪裁图片return Bitmap.createBitmap(source, x, y, width, height);}private void drawRoundRect(Canvas canvas, Paint paint, float width, float height) {Log.e("测试", "全局: width:" + this.width + ",height:" + this.height + ",局部：width:" + width + ",height:" + height+",角度:"+mRadius);switch (mCornerType) {case LEFT_TOP:drawLeftTopCorner(canvas, paint, width, height);break;case LEFT_BOTTOM:drawLeftBottomCorner(canvas, paint, width, height);break;case RIGHT_TOP:drawRightTopCorner(canvas, paint, width, height);break;case RIGHT_BOTTOM:drawRightBottomCorner(canvas, paint, width, height);break;case LEFT:drawLeftCorner(canvas, paint, width, height);break;case RIGHT:drawRightCorner(canvas, paint, width, height);break;case BOTTOM:drawBottomCorner(canvas, paint, width, height);break;case TOP:drawTopCorner(canvas, paint, width, height);break;case ALL:default:canvas.drawRoundRect(new RectF(0, 0, width, height), mRadius, mRadius, paint);break;}}/*** 画左上角*/private void drawLeftTopCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(mRadius, 0, width, height), paint);canvas.drawRect(new RectF(0, mRadius, mRadius, height), paint);canvas.drawArc(new RectF(0, 0, mDiameter, mDiameter), 180, 90, true, paint);}/*** 画左下角*/private void drawLeftBottomCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, 0, width, height - mRadius), paint);canvas.drawRect(new RectF(mRadius, height - mRadius, width, height), paint);canvas.drawArc(new RectF(0, height - mDiameter, mDiameter, height), 90, 90, true, paint);}/*** 画右上角*/private void drawRightTopCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, 0, width - mRadius, height), paint);canvas.drawRect(new RectF(width - mRadius, mRadius, width, height), paint);canvas.drawArc(new RectF(width - mDiameter, 0, width, mDiameter), 270, 90, true, paint);}/*** 画右下角*/private void drawRightBottomCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, 0, width, height - mRadius), paint);canvas.drawRect(new RectF(0, height - mRadius, width - mRadius, height), paint);canvas.drawArc(new RectF(width - mDiameter, height - mDiameter, width, height), 0, 90, true, paint);}/*** 画左 角*/private void drawLeftCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(mRadius, 0, width, height), paint);canvas.drawRect(new RectF(0, mRadius, mRadius, height - mRadius), paint);canvas.drawArc(new RectF(0, 0, mDiameter, mDiameter), 180, 90, true, paint);canvas.drawArc(new RectF(0, height - mDiameter, mDiameter, height), 90, 90, true, paint);}/*** 画右角*/private void drawRightCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, 0, width - mRadius, height), paint);canvas.drawRect(new RectF(width - mRadius, mRadius, width, height - mRadius), paint);canvas.drawArc(new RectF(width - mDiameter, 0, width, mDiameter), 270, 90, true, paint);canvas.drawArc(new RectF(width - mDiameter, height - mDiameter, width, height), 0, 90, true, paint);}/*** 画上 角*/private void drawTopCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, mRadius, width, height), paint);canvas.drawRect(new RectF(mRadius, 0, width - mRadius, mRadius), paint);canvas.drawArc(new RectF(0, 0, mDiameter, mDiameter), 180, 90, true, paint);canvas.drawArc(new RectF(width - mDiameter, 0, width, mDiameter), 270, 90, true, paint);}/*** 画下 角*/private void drawBottomCorner(Canvas canvas, Paint paint, float width, float height) {canvas.drawRect(new RectF(0, 0, width, height - mRadius), paint);canvas.drawRect(new RectF(mRadius, height - mRadius, width - mRadius, height), paint);canvas.drawArc(new RectF(0, height - mDiameter, mDiameter, height), 90, 90, true, paint);canvas.drawArc(new RectF(width - mDiameter, height - mDiameter, width, height), 0, 90, true, paint);}@Overridepublic String getId() {return "RoundedTransformation(radius=" + mRadius + ", diameter=" + mDiameter + ")";}
}

调用

 view.post(()->{Glide.with(context).load(glideUrl).override(view.getWidth(),view.getHeight()).bitmapTransform( new GlideRoundCornersTransUtils(context,radius,CornerType.ALL,view.getWidth(),view.getHeight())).into(view);});