android客户端录制音频，并且压缩成mp3格式，可以做到每秒压缩到1kb大小，一小时仅需要3.6MB，非常强大
TextView显示数学公式
CoordinatorLayout ViewPager Fragment RecyclerView 吸附 ，下拉刷新 加载更多
FlowLayout
居中放大RecyclerView，特效Drawable
VerticalViewPager，且适应电视模式（KEYCODE_DPAD_DOWN下翻页，KEYCODE_DPAD_UP上翻页）
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