@Override
public void onPageFinished(WebView view, String url) {
                Picture picture = view.capturePicture();
Toast.makeText(finplan.this, "picture height "+picture.getHeight()+ " url "+url, Toast.LENGTH_LONG).show();

mywebview.loadUrl("http://www.google.com");
// this one works fine and picture.getHeight() is > 0

mywebview.loadUrl("file:///android_asset/test.html");
// this one works, but the picture.getHeight() retrieved in onPageFinished is always 0

webView.setWebViewClient(new WebViewClient() {

    @Override
    public void onPageFinished(WebView view, String url) {
         Picture picture = view.capturePicture();
    }

});
webView.setPictureListener(new PictureListener() {

    public void onNewPicture(WebView view, Picture picture) {
        if (picture != null) {
            Toast.makeText(MainActivity.this,
                    "picture height " + picture.getHeight(),
                    Toast.LENGTH_LONG).show();
        }
    }
});