Android : Reverse Guess-Game tip between two numbers

I'd like to build a reverse guess-game. (The player has a number in his mind, and the program tries to guess the number. You have three buttons. One button for a smaller tip, one for a bigger and one for the correct.) My app is generating the numbers on keypress, but the problem, that it doesn't remember my buttons I pressed. So for example the program tips number 50. I click "Smaller" button, it generates a smaller number, for example 35. I click "Bigger" button, and it can generate 80 or 90, even if I pressed "Smaller" for 50. How could I make the program "remember" the choices? Thank you :) Best regards!

Sorry if I'm unclear, but I'm beginner.