I added Floating Windows (resizable and movable), Lockscreen Notifications and App Circle Bar features to OmniROM and built for our Galaxy Tab (p1/l/n). I built from sources of 4th August. ROM is compatible with P1, P1L and P1N. Kernel is stock Omni kernel.
Firstly, go to recovery mode and do factory reset. Then go to advanced and wipe “/system”.
After wiping system, select install zip option and choose my zip. If your recovery is old, that is not a problem and you don’t have to install a newer recovery, because while installing the ROM, the zip will also install latest version of TWRP. Then your device will reboot to TWRP automatically. After rebooting to TWRP, your device will continue installation. Then go to main menu of TWRP and install GApps (I use PA Mini Modular GApps). Voila, you installed the ROM.
So, how to enable Lockscreen Notifications or Floating Windows?
For enabling Lockscreen Notifications, go to Settings/Security/Lockscreen/Notifications and touch to “enable”.
For enabling App Circle Bar and optional Floating Windows, go to Settings/More… and tick “App Circle Bar”. Touch to “Included Apps” and add your favorite apps to App Circle Bar. And if you touch right top corner of your device, you will see App Circle Bar. Spin the bar and select an app to open, if you want to open an app in floating window, long press to app icon in app circle bar and select floating mode option. You can open infinite apps in floating window.
For detailed guide of floating windows and lockscreen notifications, watch my video: