Android: set button to random position

Question

How can I as easy as possible set the position of my Button to a random place?
I've tryed to use this: (My screen resolution is 800x480)

Button btn = (Button) findViewById(R.id.button1);  
Random r = new Random();

int x = r.nextInt(480);
int y = r.nextInt(800);

btn.setX(x);  
btn.setY(y);

But when i use this, it seems that the button some times get located outside my application or so? is it possible to prevent this and keep the button inside the app?

Answer 1

Pretty sure your problem is you are not accounting for the width and height of the button, and so if it randoms to 480*800 it will be off the screen. Try something similar to:

int x = r.nextInt(480 - buttonWidth);
int y = r.nextInt(800 - buttonHeight);