Pass image from HTML via Android javascript interface

Question

My app loads a small HTML document that contains one image in a webview. How can I fetch this image and use it as a Bitmap object in my app?

I'm already using a JavaScriptInterface together with my webview for getting some other information, like passing booleans. Is it possible to pass an image aswell via the JavaScriptIterface? Is it a good idéa or is there a better way?

Answer 1

Take a look at this question: Get image data in JavaScript?

You might be able to draw the image on a (I presume hidden) Canvas, then Base64-encode it with toDataURL and pass that as a string through the JS interface then decode it on the Java side. I imagine it'll be slow, but it's worth a try.