Simple Calculator

I'm learning android now. so, I update this app frequently.

V.1.4

1. If u push the "=" button, calculate last operator

2. After the calculate, you calculate new num

3. After the calculate, you push the number button you can calculate continue early number

4. Fix some error

V.1.3

1. Change "/" -> "÷"

2. Change result , forexample 12345 -> 12,345

3. Chang char size

4. Chang number size, forexample 0.3333333.... -> 0.334