Alpha animation in pre-HC not working if view has background

[billdawson]

A simple alpha animation ....

ViewPropertyAnimator.animate(view).alpha(0.0f); // does nothing pre-HC if view has background

... appears to do nothing on pre-HC (Gingerbread, specifically) if the view has a background. Specifically, a color background (ColorDrawable) -- I haven't tested other background drawables.

If I add a transformation such as a rotation ...

ViewPropertyAnimator.animate(view).alpha(0.0f).rotationBy(45f); // works fine

... then it all works fine. Also, if I remove the background from the view, it works fine even when only the alpha property is changed.

I've studied the code a bit, and it pretty much seems like the alpha animation is being done in the same way as the built-in, old-style AlphaAnimation. But the AlphaAnimation works fine, so I guess something is different.

[renfu8888]

thanks a lot appreciate your effort .

At 2013-09-05 02:50:37,"Bill Dawson" [email protected] wrote:

A simple alpha animation ....

ViewPropertyAnimator.animate(view).alpha(0.0f); // does nothing pre-HC if view has background

... appears to do nothing on pre-HC (Gingerbread, specifically) if the view has a background. Specifically, a color background (ColorDrawable) -- I haven't tested other background drawables.

If I add a transformation such as a rotation ...

ViewPropertyAnimator.animate(view).alpha(0.0f).rotationBy(45f); // works fine

... then it all works fine. Also, if I remove the background from the view, it works fine even when only the alpha property is changed.

I've studied the code a bit, and it pretty much seems like the alpha animation is being done in the same way as the built-in, old-style AlphaAnimation.

¡ª
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