问题
I cannot change the transparency of a TextureView by setAlpha method to maske it semi-transparent as it is promised by the android SDK. For example mTextureView.setAlpha(0.5f) does not have any effect.
回答1:
You need to make sure and setOpaque(false).
From the docs:
public void setOpaque (boolean opaque) Added in API level 14
Indicates whether the content of this TextureView is opaque. The content is assumed to be opaque by default.
回答2:
The solution I used to make it happen was to wrap the TextureView in another widget like RelativeLayout and change the transparency of the parent.
来源：https://stackoverflow.com/questions/18993355/semi-transparent-textureviews-not-working