摘要：
android如何区分屏幕的大小：Low density (120),ldpiMedium density (160),mdpiHigh density (240),hdpiSmallscreenQVGA (240x320), 2.6"-3.0" diagonalNormalscreenWQVGA (240x400), 3.2"-3.5" diagonalFWQVGA (240x432), 3.5"-3.8" diagonalHVGA (320x480), 3.0"-3.5" diagonalWVGA (480x8 阅读全文
摘要：
A composite is a group of objects in which some objects may contain others; thus, one objectmay represent groups, and another may represent an individual item, or leaf. When you modela composite, two powerful concepts emerge. One important modeling idea is to design groupsso that they can contain ei 阅读全文