Webview setBackgroundColor when playing a gif image

Question

I want to play gif using web view, the default webview background is white.so I use:

webView.setBackgroundColor(Color.TRANSPARENT); 

but when I use the code above, my gif can play, but behind my gif it also draws one gif picture like:

In fig. You will see the redundant snapshot at the back. My original gif pic is as follows:

When I tried to remove webView.setBackgroundColor(Color.TRANSPARENT) , the gif was showing good, but the background was white.

When I add code, my gif always has a redundant gif image.

So my question is: how can I set my gif background as transparent but not ruin the gif?