Question

I’m making a simple ‘tic tac toe’ game and so I have 9 buttons. These 9 buttons have the same
on click listener which I set in the layout “on click” property so that I don’t have to create 9 buttons in code just to set the listener.

My problem is that I have to remove all the listeners
from the buttons when a game is won or tied.

Is there a way to loop through all the buttons without actually having to create 9 button variables and setting each listener to null?

My code:

public void onClick(View v) {
    Button b = (Button) v;
    Integer tag = Integer.parseInt((String) b.getTag());
    values[tag] = turnToPlay;
    b.setText(turnToPlay);
    b.setOnClickListener(null);
    playerTurn.setText("Player " + turnToPlay + " turn");

    if(isBoardFull()) {
        playerWon.setText("Tie Game!!");
        removeAllListeners()
    }

    if(turnToPlay.equalsIgnoreCase("X")) {
        turnToPlay = "O";
    }

    else {
        turnToPlay = "X";
    }    
}

Answer 1

You can use this function to traverse the view tree and remove all listeners:

public void removeListeners() {
    View topView = getWindow().getDecorView();
    traverseTree(topView);
}

private void traverseTree(View view) {

    if(view instanceof ViewGroup) {
        ViewGroup group = (ViewGroup)view;
            for(int index = 0; index < group.
                getChildCount(); index++) {
                traverseTree(group.getChildAt(index));
            }
        } 

        else if (view instanceof Button) {
            Button button = (Button)view;
            button.setOnClickListener(null);
        }
    }