Thanks!
I think the part that I am confused is that I never used view.draw
(canvas) code in my program so I don't know when to call it... at this
moment, says I wanted to clear a screen, this is my code in the view:
public void clearScreen() {
gradient = false;
dots.clear();
invalidate(); // this will call the onDraw and pass in the
canvas
}
so I replace invalidate() by draw(canvas)?
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