Android/Java(?) - accessing parent from child

Question

I am (trying to) making a simple boardgame. Its UI should be very simple, a top component representing a drawing of the board itself, and on the bottom, a few TextView s giving some relevant info (turns, number of tokens on the board, current player, ...).

I have an Activity , with:

• A Game member, which handles all the logic.
• A BoardView extending View , to draw the game board, which handles the interaction.
• TextView s which should show some additional interaction.

So the BoardView and TextView instances need to access info from their sibling Game . How shall I access it?

Answer 1

You can either construct both classes BoardView and TextView with the same Game instance,

Game game = new Game();
BoardView board = new BoardView(game);
TextView text = new TextView(game);

or make Game a singleton which holds its own instance.

public class Game{

private Game game;
//private constructor
private Game(){};    

//synchronised method to create a game instance
private  synchronized static void createInstance () {
    if (game == null) game = new Game ();
}


public static void getInstance(){
  if(game==null){
    createInstance();
  }
  return game;
}

Then you can get the same game instance in both classes by calling

Game game = Game.getInstance();

Answer 2

Benjamin's answer from above is what you need. You can try MVC pattern with an implementation as suggested here