SubHandler.java

package com.calculator;

import java.util.ArrayList;

import android.widget.TextView;

public class SubHandler implements Handler{
	private double value1;
	private double value2;
	private double result;
	private String resultString;
	
	@Override
	public void handleIt(Object ... parameters) {

		//pull the CalculatorActivity from the Calculator class and assigns to activity
		CalculatorActivity activity = (CalculatorActivity) parameters[0];
		//declare Textviews from textViews pass from Calculator
		TextView inputTxt = (TextView) parameters[1];
		TextView solutionTxt = (TextView) parameters[2];	

		
		value1 = Double.parseDouble(inputTxt.getText().toString());
		value2 = Double.parseDouble(solutionTxt.getText().toString());

		result = value2 - value1;

		resultString = Double.toString(result);
		
		solutionTxt.setText(resultString);				


		inputTxt.setText("");
	}
}