Android WebView renders blank/white, view doesn't update on css changes or HTML changes, animations are choppy

Question

When ever I make a css class change, the changes don\'t always appear. This appears to happen when I have a touch event that adds something like a down class name to a butto

Answer 1

As pointed out above and elsewhere - overriding View.onDraw() and calling View.invalidate will make for an unhappy battery / app performance will drop. You can also do a manual invalidate call ever x ms like so

/**
 * Due to bug in 4.2.2 sometimes the webView will not draw its contents after the data has loaded. 
 * Triggers redraw. Does not work in webView's onPageFinished callback for some reason
 */
private void forceWebViewRedraw()
{
    mWebView.post(new Runnable() {
        @Override
        public void run()
        {
            mWebView.invalidate();
            if(!isFinishing())
                mWebView.postDelayed(this, 1000);
        }
    });
}

I tried putting an invalidate call in WebViewClient.onPageLoaded() but this does not seem to work. While my solution could be better its simple and it works for me (im just showing a twitter login)