Creating a Calculator for Android devices :

Arithematic operations implemented: +,-,*,/ 

Boolean operations implemented: and, or, not, xor Primality check, finding mod, exponent, GCD operations have also been implemented.     

Design a Interface : 

First we will create the GUI of our application coz interface of any application is very major effective part in development. 

- grid layout

- TextView

- res/layout

<?xml version="1.0" encoding="utf-8"?> 
<set xmlns:android="http://schemas.android.com/apk/res/android">

 <scale

 android:fromXScale="1.0"

 android:toXScale="2.0"

 android:fromYScale="1.0"

 android:toYScale="2.0"

 android:duration="50"

 android:pivotY="50%"

 android:pivotX="50%"

 android:repeatCount="1"

 android:repeatMode="reverse"/> </set>