android - Cannot draw on surfaceview onDraw -

hi using surfaceview draw on canvas.when using this

canvas.drawcircle(100, 100, 5, paint); //it drawing fine 

while using :

canvas.drawcircle(x, y, 5, paint); //it's not drawing.x,y being points on screen , floats. 

any help

check if x , y coordinate positive , inside bounds of view:

x >= 0 && x < canvas.getwidth() && y >= 0 && y < canvas.getheight()