Handling touches

In our Pong game, we will have no UI buttons, and therefore cannot use the OnCLickListener interface and override the onClick method. This is not a problem, however. We will just use another interface to suit our situation. We will use OnTouchListener and override the onTouchEvent method. It works a little bit differently, so let's take a look before we dive into the game code.

We must implement the OnTouchListener interface for the activity we want to listen for touches in, like this:

public class MainActivity extends Activity implements View.OnTouchListener{

Then, we can override the onTouchEvent method, perhaps a bit like this:

@Override
public boolean onTouchEvent(MotionEvent motionEvent) {
  
  float x = motionEvent.getX();
  float y = motionEvent.getY();

  //do something with the x and y values

  return false;
}

The variable x will hold the horizontal value of the position on the screen that was touched, and y will hold the vertical position. It is worth noting...