Simple Android Calculator

Features

1. Addition, Multiplication, Substraction, Division, Percentage, Logarithm, Exponential, Root, Sin, Cos, Tan, Root.
2. About menu for toast text (Appears for 2 seconds in bottom).
3. Round buttons with ripple effects.
4. Close Menu for exit.

Screenshots:

My app:

Source app:

Source Code credit CMDann

Developed for learning purposes. New java learners can easlily understand how calculator works by this small and simple app.