This is going to be a simple tutorial on how to fix Android Keyboard not working. It is annoying if you are currently experiencing such problem but there is always a fix.
Solution 1: Restart The Keyboard
Restarting the keyboard can be very effective\n in solving the problem.
Go to the Settings menu of the device
Scroll down to the Apps section and Tap on Application Manager
Swipe to go to the “All” tab
Now look for the app Android Keyboard and tap on it 5.
Now tap on Force Stop to stop the keyboard Exit the app and restart your device.
Solution 2: Restart The Device
A device reboot can solve basic app problems and can fix simple glitches in the device. Reboot your smartphone device and check if its fixed.
Solution 3: Clear Cache and Data For Keyboard
See More : https://specsdevices.com/7-ways-fix-android-keyboard-not-working/