Android studio: Make a imageView face users finger touch

im trying to make a game and i want a imageView at the bottom of the screen to stay in its location but turn to face a touch when a user touches the screen and when they relese thear finger the imageView stays faceing where the user faced it and when user touches that imageView then it shoots out a ball from the front shooting part and when that ball hits a incoming ball both of the balls dissapear and if the shooter ball reaches the edge of the screen it dissapears. I know this is a BIG question but any help would be extremely helpful and AWESOME :) .