facebook/fresco

Overlay drawable alpha value not respected

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#1,905 创建于 2017年9月18日

 (1 条评论) (2 个反应) (1 位负责人)Java (3,750 个派生)batch import
buggood first issuehelp wanted

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描述

Description

Reported via StackOverflow: https://stackoverflow.com/questions/45971482/translucent-image-overlay-drawable-loses-alpha

If you set an overlay drawable, the alpha value will always be set to 255, no matter what the actual alpha value is.

Reproduction

Drawable drawable = ...;
drawable.setAlpha(50);
draweeView.getHierarchy().setOverlayImage(drawable);

The alpha value of the drawable will be 255 instead of 50.

Solution

The reason for this is that a FadeDrawable holds all drawables of the drawee hierarchy and fades between them as needed - but does not respect initial alpha values.

Additional Information

  • Fresco version: 1.5.0
  • Platform version: All platforms

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