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Draw a line between objects in Android

Hello I have a layout with a number of buttons created dynamically. What I need to do is draw a line connecting the first and last buttons. How can I get the position of the buttons, and how can I draw a line? Thank you!

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This is how you draw the line:

canvas.drawLine(startPoint.x, startPoint.y, endPoint.x, endPoint.y, paint);


This is done for the canvas object in the method onDraw

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