如何设置x和y协调Android

Question

i have created a 10x10 grid in the center of the screen in android, now i would like to give each square in the grid a coordinate. for example top left square in the grid would be 0 then 1, 2,3 and so on. But i dont know how to do this. i am trying to do this in a draw class which extends view. my code of what i am trying is below

public int coordinates(int posX, int posY){

        int startX = (screenWidth / 2) - (rectSide / 2);
        int startY = (screenHeight / 2) - (rectSide / 2);

        //for(int i=0; i<=10000; i+=100){
        xCoord = (startX + (posX*100));
        yCoord = (startY + (posY*100));
    }

Answer 1

You know you start at point 0,0 top left . So assuming you have equally spaces squares you can just do the screen height / 10 to get how far apart each square should be in the y direction . And then do the same for the x direction . Say your screen was 1000 pixels tall .

Then your grid at position (0,1) would be at (0,100) pixels. (0,2) would be (0,200) you are just multiplying the y coordinate by the height of each square in the grid.