解决Glide4.0和圆角裁剪CenterCrop冲突

两种方案：

1、重写BitmapTransformation

重写方法解决冲突，来自CSDN的一个解决方案

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

    public GlideRoundTransform(Context context) {
        this(context, 4);
    }

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

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        Bitmap bitmap = TransformationUtils.centerCrop(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, bitmap);
    }

    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;
    }

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

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {

    }
}

在加载的时候使用

RequestOptions myOptions = new RequestOptions()  
                .transform(new GlideRoundTransform(this,30));  

        Glide.with(this)  
                .load(R.drawable.item1)  
                .apply(myOptions)  
                .into(icon1);  

地址http://blog.csdn.net/flyinbed_/article/details/75506062

2、使用第三方框架

库地址：
https://github.com/wasabeef/glide-transformations

该库是专门针对glide的一个辅助类，包括裁剪
效果图

引入方法

    compile 'jp.wasabeef:glide-transformations:3.0.1'

使用方法

   Glide.with(mContext)
                .load(aClass.img)
                .apply(RequestOptions.bitmapTransform(new MultiTransformation(
                        new CenterCrop(),
                        new RoundedCornersTransformation(SizeUtils.dp2px(5), 0, RoundedCornersTransformation.CornerType.TOP))))
                .into(imageView);

这里RoundedCornersTransformation的第一个参数需要转换成像素