how to use variable in android studio code example

Example 1: how to declare variable in android

I suggest learning Java fundamentals first. Declaring a variable is fundamental to Java programming language (and indeed many programming languages), its not just Android specific.

You can learn Java fundamentals here.

Good Luck in your learning

Example 2: how to declare variable in android

var1 = 'variable1';
var2 = 'variable2';