Glide3.0 ：
出現(xiàn)原因：看centerCrop()方法的源碼可知,也是需要調(diào)用transform()方法的.所以前后共用CenterCrop會覆蓋掉GlideRoundImage的效果

public BitmapRequestBuilder<ModelType, TranscodeType> centerCrop() {
        return transform(glide.getBitmapCenterCrop());
    }

解決辦法：2個效果同時放在transform里面就可以解決問題了坯癣。

.transform(new CenterCrop(Context context),new GlideRoundTransform(Context context,5))

Glide4.0
使用了glide4.0.0 +后，.transform方法參數(shù)改變最欠，不能添加new CenterCrop(Context context)方法示罗，修改GlideRoundTransform 繼承CenterCrop 不在繼承BitmapTransformation 如下：

public class GlideRoundTransform extends CenterCrop {

    private static float radius = 10f;
    public GlideRoundTransform(Context context) {
        this(context,10);
    }
    public GlideRoundTransform(Context context, int dp) {
        super(context);
        this.radius = DensityUtils.dp2px(context,dp);
    }

    @Override
    protected Bitmap transform(BitmapPool pool, Bitmap toTransform, int outWidth, int outHeight) {
        //glide4.0+
        Bitmap transform = super.transform(pool, toTransform, outWidth, outHeight);
        return roundCrop(pool, transform);
        //glide3.0
        //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;
    }

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

    @Override
    public void updateDiskCacheKey(MessageDigest messageDigest) {

    }

然后引用：

.transform(new GlideRoundTransform(mContext,5))

就可以正常顯示了