Replace the short video with an animated vector image that shows the
swipe gesture.
This is much lighter and reliable than the mp4 video, which failed to
play on many devices.
Source for the image of the key is in inkscape SVG format in srcs/res
and is converted to an android drawable when needed. The swipe animation
is hand-written.
Incompatible APIs were used in the custom layouts and the extra keys
options.
Add @TargetApi annotations to help catch similar issues in the future
with the help of 'gradle lint'.
This activity points to the system settings page for enabling input
methods. This is purely a shortcut but is expected by many users.
It could be made more useful in the future or hidden whenever the
keyboard is enabled.
