File uploads in WebView not working on KitKat (4.4.0->4.4.2)

[Whyser]

This is probably a VERY known issue (and might even be unsolvable). But I thought I'd make an issue about it so that people know it won't work for KitKat 4.4.0->4.4.2. Also maybe update the README.md to state this?

It should work in KitKat 4.4.3+ though, but I haven't tested it myself.

[ocram]

You're right, it's good to have this in the issues, at least. Don't know if it's necessary to have this in the README as well.

So the file uploads don't work on Android 4.4 and never will. This is because Android removed the undocumented APIs that existed before Android 4.4 and only introduced a new API in 5.0.

This should affect Android 4.4.3 as well.

[ocram]

In order to check if file uploads are available or not, you can call the following method:

AdvancedWebView.isFileUploadAvailable()