One Calculator：除了具备基本的计算器功能只玩还包括单位换算、科学计算、矩阵计算等等，比较使用。
官方介绍
One Calculator是一款计算器，可以进行科学计算、矩阵计算，单位换算。
更新日志
- Layout improvements inspired from the new Material Design by Google.
- "Settings" have been moved in NavigationDrawer.
- APK size have been strongly reduced.
- Fixed some code errors.
