Both the invalidate and the postInvalidate methods of the View class have a version that accepts four parameters. These four parameters represent a rectangle within the View.

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Quizplus · Accepted Answer

The invalidate(Rect) and postInvalidate(Rect) methods of the View class accept a rectangle as a parameter, representing the area of the view that needs to be invalidated or post-invalidated, respectively.

Both the Invalidate and the PostInvalidate Methods of the View