导入

implementation 'com.github.bumptech.glide:glide:3.7.0'

样式类

import android.content.Context;
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;

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

    /**
     * 构造函数 默认圆角半径 4dp
     *
     * @param context Context
     */
    public GlideRoundTransform(Context context) {
        this(context, 4);
    }
    /**
     * 构造函数
     *
     * @param context Context
     * @param dp 圆角半径
     */
    public GlideRoundTransform(Context context, int dp) {
        super(context);
        radius = Resources.getSystem().getDisplayMetrics().density * dp;
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        return roundCrop(pool, toTransform);
    }

    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);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName() + Math.round(radius);
    }

}

使用

Glide.with(context)
                    .load(url)
                    .transform(new CenterCrop(context),new GlideRoundTransform(context))
                    .diskCacheStrategy(DiskCacheStrategy.ALL)
                    .placeholder(R.mipmap.ic_launcher)
                    .dontAnimate()
                    .crossFade()
                    .into(ImageView);