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Stacking UI elements and Tracking Android

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http://stackoverflow.com – I have many rectangles(Cards) (Technically a Rect class along with a ShapeDrawable inside it) and they are stacked on top of one another or should be kept on the sides..They should respond to touch and zoom events. For example, Here the card that is shaded is below and the rest are above it.The card 2 & 3 Partially hides it.When I touch the one below it should come Up. How should I design my cards or shaded rectangles.Should I use a custom view or View group.(I am new to android and I am not sure how to implement this.Is this even a good Idea.Can we have so many of them on the screen?) (HowTos)