如题所示，请教下各位Android中都有些什么计量单位？如何使用？
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dp Use dp for layout sizesp Use sp for font sizepx Rarely used, usually when absolute units are needed (such as the separator height of a list)
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dp Use dp for layout size
sp Use sp for font size
px Rarely used, usually when absolute units are needed (such as the separator height of a list)