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...
