在App开放中经常遇到设置ImageView为部分圆角的情况，但是Glide又没有提供这个方法，该怎么办呢？直接上代码！/** * @author csc * @date 2019-01-18 * Todo 设置图片部分圆角 */public class RoundedCornersTransform implements Transformation<Bitmap> {    private BitmapPool mBitmapPool;     private float radius;     private boolean isLeftTop, isRightTop, isLeftBottom, isRightBotoom;     /**     * 需要设置圆角的部分     *     * @param leftTop     左上角     * @param rightTop    右上角     * @param leftBottom  左下角     * @param rightBottom 右下角     */    public void setNeedCorner(boolean leftTop, boolean rightTop, boolean leftBottom, boolean rightBottom) {        isLeftTop = leftTop;        isRightTop = rightTop;        isLeftBottom = leftBottom;        isRightBotoom = rightBottom;    }     /**     * @param context 上下文     * @param radius  圆角幅度     */    public RoundedCornersTransform(Context context, float radius) {        this.mBitmapPool = Glide.get(context).getBitmapPool();        this.radius = radius;    }     @NonNull    @Override    public Resource<Bitmap> transform(@NonNull Context context, @NonNull Resource<Bitmap> resource, int outWidth, int outHeight) {         Bitmap source = resource.get();        int finalWidth, finalHeight;        //输出目标的宽高或高宽比例        float scale;        if (outWidth > outHeight) {            //如果 输出宽度 > 输出高度 求高宽比             scale = (float) outHeight / (float) outWidth;            finalWidth = source.getWidth();            //固定原图宽度,求最终高度            finalHeight = (int) ((float) source.getWidth() * scale);            if (finalHeight > source.getHeight()) {                //如果 求出的最终高度 > 原图高度 求宽高比                 scale = (float) outWidth / (float) outHeight;                finalHeight = source.getHeight();                //固定原图高度,求最终宽度                finalWidth = (int) ((float) source.getHeight() * scale);            }        } else if (outWidth < outHeight) {            //如果 输出宽度 < 输出高度 求宽高比             scale = (float) outWidth / (float) outHeight;            finalHeight = source.getHeight();            //固定原图高度,求最终宽度            finalWidth = (int) ((float) source.getHeight() * scale);            if (finalWidth > source.getWidth()) {                //如果 求出的最终宽度 > 原图宽度 求高宽比                 scale = (float) outHeight / (float) outWidth;                finalWidth = source.getWidth();                finalHeight = (int) ((float) source.getWidth() * scale);            }        } else {            //如果 输出宽度=输出高度            finalHeight = source.getHeight();            finalWidth = finalHeight;        }         //修正圆角        this.radius *= (float) finalHeight / (float) outHeight;        Bitmap outBitmap = this.mBitmapPool.get(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);        if (outBitmap == null) {            outBitmap = Bitmap.createBitmap(finalWidth, finalHeight, Bitmap.Config.ARGB_8888);        }         Canvas canvas = new Canvas(outBitmap);        Paint paint = new Paint();        //关联画笔绘制的原图bitmap        BitmapShader shader = new BitmapShader(source, Shader.TileMode.CLAMP, Shader.TileMode.CLAMP);        //计算中心位置,进行偏移        int width = (source.getWidth() - finalWidth) / 2;        int height = (source.getHeight() - finalHeight) / 2;        if (width != 0 || height != 0) {            Matrix matrix = new Matrix();            matrix.setTranslate((float) (-width), (float) (-height));            shader.setLocalMatrix(matrix);        }         paint.setShader(shader);        paint.setAntiAlias(true);        RectF rectF = new RectF(0.0F, 0.0F, (float) canvas.getWidth(), (float) canvas.getHeight());        //先绘制圆角矩形        canvas.drawRoundRect(rectF, this.radius, this.radius, paint);         //左上角圆角        if (!isLeftTop) {            canvas.drawRect(0, 0, radius, radius, paint);        }        //右上角圆角        if (!isRightTop) {            canvas.drawRect(canvas.getWidth() - radius, 0, canvas.getWidth(), radius, paint);        }        //左下角圆角        if (!isLeftBottom) {            canvas.drawRect(0, canvas.getHeight() - radius, radius, canvas.getHeight(), paint);        }        //右下角圆角        if (!isRightBotoom) {            canvas.drawRect(canvas.getWidth() - radius, canvas.getHeight() - radius, canvas.getWidth(), canvas.getHeight(), paint);        }         return BitmapResource.obtain(outBitmap, this.mBitmapPool);    }      @Override    public void updateDiskCacheKey(@NonNull MessageDigest messageDigest) {    }}

 

 

 

如何使用？Glide 4.0+ 的使用RoundedCornersTransform transform = new RoundedCornersTransform(mContext, DensityUtil.dip2px(10));transform.setNeedCorner(true, false, true, false);RequestOptions options = new RequestOptions().placeholder(R.color.color_eee).transform(transform);                                Glide.with(mContext).asBitmap().load(mPicturesBeans.get(0).getSrc()).apply(options).into(holder.mPictureComment);上面的实现效果就是：左上角和左下角为圆角。

 

Glide 小于4.0的使用：RoundedCornersTransform transform = new RoundedCornersTransform(mContext, DensityUtil.dip2px(10));transform.setNeedCorner(true, false, true, false);Glide.with(this).                load(mPicturesBeans.get(0).getSrc()).                asBitmap().                skipMemoryCache(true).                diskCacheStrategy(DiskCacheStrategy.NONE).                transform(transform).                into(holder.mPictureComment); --------------------- 作者：csc_1024 来源：CSDN 原文：https://blog.csdn.net/csclmf/article/details/86544031 版权声明：本文为博主原创文章，转载请附上博文链接！