Future Learn Week 2 Keep Ball in Canvas

 @Override protected void updateGame(float secondsElapsed) {
        /*Detect if the ball is touching or has passed the edge of the screen.
          If it has, reverse the speed of the ball and slow it down slightly (making it appear
          to bounce back, losing 10% power)
         */
        if (mBallX >= mCanvasWidth) {
            mBallX = mCanvasWidth;
            mBallSpeedX = 0f - mBallSpeedX;
        }

        if (mBallX <= 0) {
            mBallX = 0;
            mBallSpeedX = 0f - mBallSpeedX;
        }

        if (mBallY >= mCanvasHeight) {
            mBallY = mCanvasHeight;
            mBallSpeedY = 0f - mBallSpeedY;
        }

        if (mBallY <= 0) {
            mBallY = 0;
            mBallSpeedY = 0f - mBallSpeedY;
        }

        //Move the ball's X and Y using the speed (pixel/sec)
        mBallX = mBallX + secondsElapsed * mBallSpeedX;
        mBallY = mBallY + secondsElapsed * mBallSpeedY;

        }