Glide控制显示图片上方2个圆角（或4个都是圆角）

自定义Glide

package com.wintec.huashang.ui;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;

import com.bumptech.glide.load.engine.bitmap_recycle.BitmapPool;
import com.bumptech.glide.load.resource.bitmap.BitmapTransformation;
import com.bumptech.glide.load.resource.bitmap.TransformationUtils;

import java.security.MessageDigest;

import androidx.annotation.NonNull;

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);
        //只保留左上角、右上角圆角（注释掉以下两行，则四个角为圆角）
        RectF rectRound = new RectF(0f, 100f, source.getWidth(), source.getHeight());
        canvas.drawRect(rectRound, paint);
        return result;
    }
}
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使用

public class GlideUtil {
    public static RequestBuilder<Drawable> GlideWithPlaceHolder(Context context, Object object) {
       /*默认的策略是DiskCacheStrategy.AUTOMATIC
//DiskCacheStrategy有五个常量：
//DiskCacheStrategy.ALL 使用DATA和RESOURCE缓存远程数据，仅使用RESOURCE来缓存本地数据。
//DiskCacheStrategy.NONE 不使用磁盘缓存
//DiskCacheStrategy.DATA 在资源解码前就将原始数据写入磁盘缓存
//DiskCacheStrategy.RESOURCE 在资源解码后将数据写入磁盘缓存，即经过缩放等转换后的图片资源。
//DiskCacheStrategy.AUTOMATIC 根据原始图片数据和资源编码策略来自动选择磁盘缓存策略。*/

//每次渲染都需要1S
//        return Glide.with(context).load(object).diskCacheStrategy(DiskCacheStrategy.ALL).apply(new RequestOptions().placeholder(R.drawable.camera).dontAnimate());
//        三次有一次渲染需要1S,默认是Auto
//        return Glide.with(context).load(object).diskCacheStrategy(DiskCacheStrategy.AUTOMATIC).apply(new RequestOptions().placeholder(R.drawable.camera).dontAnimate());
//        RequestOptions options = new RequestOptions().error(R.drawable.img_load_failure).bitmapTransform(new RoundedCorners(30));//图片圆角为30
//        return Glide.with(context).load(object).diskCacheStrategy(DiskCacheStrategy.NONE).apply(new RequestOptions().placeholder(R.drawable.camera).dontAnimate().bitmapTransform(new RoundedCorners(30)));
        return Glide.with(context).load(object).diskCacheStrategy(DiskCacheStrategy.NONE).apply(new RequestOptions().placeholder(R.drawable.camera).dontAnimate().transform(new GlideRoundTransform(15)));
    }

}
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实际调用

GlideUtil.GlideWithPlaceHolder(MainActivity.this, data.toString()).into(iv);
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