Sharing constants in multiple classes (android minesweeper)

I instantiate the class with the Button extension and access the integer variable directly for better performance. I use constants to easily define the current setting variable.

I have constants declared by both the Button class and the Activity class that creates them. I found similar questions and I don’t think it’s good practice to create a class to just hold constants.

What is the best way to use the same constant declaration in both classes?

I am a beginner programmer, so it is possible that I missed a simple solution.

Button Class:

public class GridButton extends Button {
  public int displayStatus;

  // constants for mine display status
  private static final int UNTOUCHED = 1;
  private static final int UNCOVERED = 2;
  private static final int FLAGGED = 3;
  private static final int HIT = 4;
  ...
}

Action class:

public class PlayGameActivity extends Activity {      
  private GridButton[][] gridButtons;      

  // constants for mine display status
  private static final int UNTOUCHED = 1;
  private static final int UNCOVERED = 2;
  private static final int FLAGGED = 3;
  private static final int HIT = 4;
  ...

  // e.g. accessing displayStatus value
  if (gridButtons[currentRow][currentColumn].displayStatus == FLAGGED)
  {
  }
}