This worked for me,
mWebView.setBackgroundColor(Color.TRANSPARENT);
At the bottom of this earlier mentioned issue there is an solution.
It's a combination of 2 solutions.
webView.setBackgroundColor(Color.TRANSPARENT);
webView.setLayerType(WebView.LAYER_TYPE_SOFTWARE, null);
When adding this code to the WebViewer after loading the url, it works (API 11+).
It even works when hardeware acceleration is ON
I had the same issue with 2.2 and also in 2.3. I solved the problem by giving the alpa value in html not in android. I tried many things and what I found out is setBackgroundColor(); color doesnt work with alpha value. webView.setBackgroundColor(Color.argb(128, 0, 0, 0)); will not work.
so here is my solution, worked for me.
String webData = StringHelper.addSlashes("
"content=\"text/html; charset=utf-8\">
"padding: 20px; height: 260px; border-radius: 8px;\"> $$$ Content Goes Here ! $$$