I have created an ImageView

image = new ImageView(myMainActivity.this);
Bitmap pictBM = BitmapFactory.decodeFile(fName);
image.setImageBitmap(pictBM);
. . . 

How do I create an overlay or something so
I can click an ImageButton and then   mark two points
draw a line between them and measure the distance?

Also on the ImageButton is there a way to click and hold it down (as Active) 
until the two clicks
on the image have taken place ???

so far I have the calcDistance  function

private double calcDistance (Point pt1, Point pt2) {
    double square_x = (double) (pt2.x * pt2.x) - (double)(pt1.x * pt1.x);
    double square_y = (double) (pt2.y * pt2.y) - (double)(pt1.y * pt1.y);
    double dist = Math.sqrt( (double)square_x + (double)square_y );
        
    return dist;
}

I can't seem to get it right to mark the Image  and the online examples all 
talk about  R.drawable
which I have none .

Thanks in advance


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