Send the following on WhatsApp
Continue to ChatAndroid Hide Soft Keyboard and Show Soft Keyoard https://www.myandroidsolutions.com/2012/10/07/android-hide-soft-keyboard-and-show-soft-keyoard/
Android Hide Soft Keyboard and Show Soft Keyoard https://www.myandroidsolutions.com/2012/10/07/android-hide-soft-keyboard-and-show-soft-keyoard/