android webview rendering is showing a White Page

Question

Sometimes, when I load my webview with loadUrl, the website is not showing up until I touch the screen or scroll.

It\'s like I have a webview drawing problem.

Answer 1

I'am not sure, I don't have the whole code, but I think is related to the webViewClient implemented in this function:

public boolean shouldOverrideUrlLoading(WebView view, String url){
    // do your handling codes here, which url is the requested url
    // probably you need to open that url rather than redirect:
    view.loadUrl(url);
    view.setVisibility(View.VISIBLE);
    return false; // then it is not handled by default action
}

here is the officiel definition:

public boolean shouldOverrideUrlLoading (WebView view, String url)

Try to test with your code without implementing shouldOverrideUrlLoading, or make it return true.

Answer 2

What version of Android are you testing on? Pre-4.1 versions of Android seem to have this sort problem with WebViews sometimes.

Add this to the manifest for that Activity to fix the problem:

android:hardwareAccelerated="false"

Answer 3

Make WebView invisible in your layout:

<WebView
    ...
    android:visibility="invisible"
    .../>

Now, show it back when onPageFinished occurs for the fist time:

webView.setWebViewClient(new WebViewClient() {
    @Override
    public void onPageFinished(WebView view, String url) {
        if (webView.getVisibility() != View.VISIBLE) {
            webView.setVisibility(View.VISIBLE);
        }
    }
});