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.

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You can learn Java fundamentals here.

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Good Luck in your learning

public class MyApplication extends Application {

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    private String someVariable;

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    public String getSomeVariable() {

        return someVariable;

    }

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    public void setSomeVariable(String someVariable) {

        this.someVariable = someVariable;

    }

}

var1 = 'variable1';

var2 = 'variable2';