Feature/youtube-full-screen

[prnvptl]

Closes #18

Enables Youtube video full screen with a clean UX

• User will be able to go to full screen and back
• Video will NOT reset or go out of sync with this interaction
• No need to go outside of the app for the lesson at all :^)
• Uses Kotlin and cleans up the watch content fragment
• Uses out of the box WebView with a custom chrome client

After trying many solutions, I managed to stitch this one together which uses a custom chrome web client and overrides onShowCustomView and onHideCustomView which in turn, implements hiding and showing a full-screen video. Refactored some code in the WatchContentFragment.

Alternate solutions: 1) Youtube Video Player API: costs $ after 10K queries / day. implementation is possible but cumbersome and will require more effort

2) android-youtube-player Allows for ALOT of customizability, however seems like overkill for now, and would also require much more effort to even get a simple web view working like the current web view. A simple solution of showing full screen would just be to show a button outside of the web view. not the best UX.)

Sources:

• https://stackoverflow.com/questions/15768837/playing-html5-video-on-fullscreen-in-android-webview/16179544#16179544
• https://github.com/akhgupta/WebviewVideo

[Gear61]

Awesome pull request, thanks for sharing 😄