移动开发不能不知道的事-dp

	dp	px	sp	mm	in	pt
ldpi	@ 48.00dp	= 36.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
mdpi	@ 48.00dp	= 48.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
tvdpi	@ 48.00dp	= 63.90px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
hdpi	@ 48.00dp	= 72.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
xhdpi	@ 48.00dp	= 96.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
xxhdpi	@ 48.00dp	= 144.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt
xxxhdpi	@ 48.00dp	= 192.00px	= 48.00sp	= 7.62mm	= 0.30in	= 21.60pt