Creating Simple Piano app | using event listeners

We are creating a simple Piano app using event listeners.
when touch down we create touch effect and playsound when user lift up the finger we stop playing sound and reset background colour of the keys ..... this project is available on our jokhio Sketch Projects app. and the codes also.

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demo app
https://play.google.com/store/apps/details?id=jokhio.simple.piano

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download Jokhio Sketch Projects
https://jokhioapps.blogspot.com/2021/01/our-project-store.html
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btw these are the codes

//ASSIGN LISTENER TO THE VIEW
/**
*"key1" IS THE I'D OF VIEW (LINEAR, TEXTVIEW ETC)
* YOU HAVE TO CHANGE VARIABLE NAME ALSO "l1" HERE TO "l2" OR "l3" ETC.
**/

MyOnTouchListener1 l1 = new MyOnTouchListener1();
key1.setOnTouchListener(l1);
//DEFINING LISTENER CLASS
class MyOnTouchListener1 implements OnTouchListener {
public boolean onTouch(View v, MotionEvent event) {
switch(event.getAction()) {
case MotionEvent.ACTION_DOWN:
// touch down code
break;

case MotionEvent.ACTION_MOVE:
// touch move code
break;

case MotionEvent.ACTION_UP:
// touch up code
break;
}
return true;
}
}

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