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一、为什么要有Fragment?Android运行在各种各样的设备中，有小屏幕的手机，还有大屏幕的平板，电视等。同样的界面在手机上显示可能很好看，在大屏幕的平板上就未必了，手机的界面放在平板上可能会有过分被拉长、控件间距过大等情况。针对屏幕尺寸的差距，Fragment 的出现能做到一个App可以同时...

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