Click on android keyboard using script in test complete

I think sending Keys("[Enter]") would be the same here as the done, search, checkmark etc... buttons on Android keyboards I believe are synonymous to that. 

 

Alternatively if you really want to actually touch the button, you could use https://support.smartbear.com/testcomplete/docs/app-testing/mobile/android/simulating-user-actions/basic-touches.html