android 开发中关于多个界面的管理采用了观察者模式的设计理念 完美实现了 android application 的actvity的生命周期的管理-Management of multiple Android interface development used in the observation of the perfect design concept model implementation of the Android application actvity life cycle

软件键盘，类似android,ios的键盘。-soft keyboard, like the keyboard of android,ios

实现drawgrid自画，类似于Android的listview效果。-Achieve drawgrid self-portraits, similar to the effect of Android listview.

drawerlayout的简单使用，和Actionbar联合使用-Simple use of drawerlayout, and Actionbar combined use