Glide转化圆形图片的坑

昨天写了Glide转化圆形图片的ImageView，然后就把我坑了好久。。。。。。。

Demo地址：https://github.com/HarryXR/GlideImageView

1.首先导包

compile 'com.github.bumptech.glide:glide:3.6.1'

2.开始实现

查看文档发现实现圆形图片都是重写Glide的BitmapTransformation类

使用方式：

  
  
   Glide.with(context).load(url).transform(new CircleTransForm(context)).into(iv);
public static class CircleTransform extends BitmapTransformation {
    public CircleTransform(Context context) {
        super(context);
    }

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

    private static Bitmap circleCrop(BitmapPool pool, Bitmap source) {
        if (source == null) {
            return null;
        }

        int size = Math.min(source.getWidth(), source.getHeight());
        int x = (source.getWidth() - size) / 2;
        int y = (source.getHeight() - size) / 2;

        // TODO this could be acquired from the pool too
        Bitmap squared = Bitmap.createBitmap(source, x, y, size, size);

        Bitmap result = pool.get(size, size, Bitmap.Config.ARGB_8888);
        if (result == null) {
            result = Bitmap.createBitmap(size, size, 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);
        float r = size / 2f;
        canvas.drawCircle(r, r, r, paint);
        return result;
    }

    @Override
    public String getId() {
        return getClass().getName();
    }
}

由于我要定制Glide的加载功能，没有使用上诉拼接加载的方式

  
  

   
   
builder = (DrawableTypeRequest) Glide.with(context).load(url).dontAnimate();
builder.transform(new CircleTransForm(context));
builder.into(this);
  
  

坑点来了

DrawableTypeRequest是DrawableRequestBuilder的子类，在我的使用方法中，不能使用

DrawableRequestBuilder来添加transform

必须使用DrawableTypeRequest才能实现圆形图片的转化。