Draw in ImageView - android-studio

Question

I want to fill into imageView a path following the finger position and you can't draw outside of imageView. You only able to draw in imageView. I use Paint an on Touch. What I want to do is be able to draw where the user touches that Imageview with an image from the drawable folder.
this my java code
public class MyImageView extends androidx.appcompat.widget.AppCompatImageView {
private ArrayList<Point> mTouches;
private Bitmap mMarker;
//Java constructor
public MyImageView(Context context) {
super(context);
init();
}
//XML constructor
public MyImageView(Context context, AttributeSet attrs) {
super(context, attrs);
init();
}
private void init() {
mTouches = new ArrayList<Point>();
mMarker = BitmapFactory.decodeResource(context.getResources(), R.drawable.trois);
}
#Override
public boolean onTouchEvent(MotionEvent event) {
//Capture a reference to each touch for drawing
if(event.getAction() == MotionEvent.ACTION_DOWN) {
mTouches.add( new Point((int)event.getX(),(int) event.getY()) );
return true;
}
return super.onTouchEvent(event);
}
#Override
protected void onDraw(Canvas c) {
//Let the image be drawn first
super.onDraw(c);
//Draw your custom points here
Paint paint = new Paint();
for(Point p : mTouches) {
c.drawBitmap(mMarker, p.x, p.y, paint);
}
}
}
Activity code
<ImageView
android:id="#+id/image_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="#drawable/trois" />
I create a main Activity with imageVien instance from the class MyimageView
But I get is my original Imageview and it does not do anything when I touch it.
Thanks for helping