We watch video everyday. Some of video streaming apps is do not hide soft keys (home / back / recent apps key) during full screen video playback. It is very annoying and disturbing. The app add a "Down Button" for selected apps. Users can press this button to hide the soft keys, and enjoy truly full screen video playback.
The soft keys bar is also know as navigation bar.

★ Hide soft keys on demand anytime, anywhere (by pressing our floating "Down Button")
★ Move "Down Button" to your favorite location
★ Remember location for portrait and landscape mode
★ Customizable size and transparency
★ Display "Down Button" only for selected apps (floating on top of your screen)
★ Auto start on boot
★ Lock "Down Button" position

★ Ongoing hiding / fullscreen function *REQUIRE ROOT*
★ Auto-fullscreen list *REQUIRE ROOT*

*** 4.3+ user with ROOT: You can now download our "Notification Helper" app to hide, force clear, and recover notifications ***
http://goo.gl/t5UAgC

Update Log:

1.0.87 Fix for android 5, re-support Selected Apps Only for lollipop, require PACKAGE_USAGE_STATS permission
1.0.84 Xiaomi fix
1.0.83 Allow fully transparent down button
1.0.82 Fix for 4.4

1.0.80-81
* Enforce ACCESS_SUPERUSER permission
* Update Icons for higher resolutions
* Fix for edge not found problem
* Fix for Nexus 5
* Other minor bug fixes

1.0.76 Auto unlock for force-fullscreen function [Kitkat/ #screen lock: Slide or None] (require DISABLE_KEYGUARD permission)

1.0.75 (Rooted devices only feature)
* Ongoing hiding / fullscreen function (Require SET_WALLPAPER permission)
* Auto-fullscreen list

1.0.71 Bug fix
1.0.70 Notification fix (4.3+)
1.0.69 Add +1 button, please recommend it to your friends. Thank!
1.0.66 Widget bug fix
1.0.65 On / Off switch for displaying "Down Button"

Popular supported devices: Nexus 4, Nexus 5, Nexus 7, Nexus 10, LG G2, Xperia, etc.