Question

I have a WebView with data populated from local javascript (in the “asset” folder). The WebView takes several seconds to load so I’d like to keep it on device rotation. I don’t want to use configChanges since it has some other collateral effects.

It seems to me that the best approach is to make a Picture from the WebView and load the Picture instead of the WebView on rotation but I can’t figure out how.

Here is the code I tried:

Canvas canvas = new Canvas();
pictureNightDay.draw(canvas);
Bitmap b = Bitmap.createBitmap(pictureNightDay.getWidth(), pictureNightDay.getHeight(),Config.ARGB_8888);
myWebViewNightDay.draw(new Canvas(b));

but this only shows a blank View.

The “pictureNightDay” was previously saved with

pictureNightDay = myWebViewNightDay.capturePicture();

Thanks, bye
Maurizio

Answer 1

At last I came with the following answer: I used two Views, one WebView and one ImageView (initially hidden)

Save the picture when WebView is loaded:

pictureNightDay = myWebViewNightDay.capturePicture();

(pictureNightDay is a static field).

Then on rotation check if pictureNightDay is not null and swap the ImageView and WebView visibility:

ImageView im = (ImageView) l.findViewById(R.id.tripreport_tipology_imagenightday);
im.setImageDrawable(new PictureDrawable(pictureNightDay));
im.setVisibility(View.VISIBILE);
myWebViewNightDay.setVisibility(View.GONE);