Learning Java by Building Android Games - Second Edition

Coding the collision detection and playing sounds

Now we have done so much theory and preparation we can finish everything off very quickly. We will write code to detect all the various collisions, using the RectF intersects method and play sounds and call the required methods of our classes.

The bat and the ball

Add the following highlighted code inside the detectCollisions method.

private void detectCollisions(){
   // Has the bat hit the ball?
   if(RectF.intersects(mBat.getRect(), mBall.getRect())) {
         // Realistic-ish bounce
         mBall.batBounce(mBat.getRect());
         mBall.increaseVelocity();
         mScore++;
         mSP.play(mBeepID, 1, 1, 0, 0, 1);
   }

   // Has the ball hit the edge of the screen

   // Bottom

   // Top

   // Left

   // Right

}

Tip

You will need to import the RectF class.