Just a heads up to anyone reading this. You CAN use emoji keyboard with your stock keyboard or swiftkey, what ever.
To use it:
Click on a text box like you usually do to type something. In your notification drawer there will be a notification for input selection.
Click on it, and select Emoji Keyboard.
From there it pops up and enjoy!
It's now working on my device and I can use it wherever I want. Just tested it out on instagram.
---------- Post added at 11:21 AM ---------- Previous post was at 11:09 AM ----------
You can also set it to switch to the emoji keyboard by pressing the language button on the keyboard by:
Go to Language and Input
Select settings on Android Keyboard
Select Advanced Settings
Select Switch to other input methods
Do the same with emoji Keyboard
To get mine to work I also had to do the same to android aosp keyboard. But the language and input only takes me to emoji and not aosp keyboard. So I'm on 4.2 keyboard all the time until I press the Globe button then it brings me to Emoji, and when I press globe again it takes me back to 4.2 keyboard.
Hope this helps anyone. Thanks to the users above who outlined how to install the emoji keyboard. And my post in the second page brings you to the emoji zip! You download the "universal" flashable zip.
Peace out/ ✌