Basic Android Calculator
Basic Android Calculator Default.java package com.woplandia.calc; import java.util.HashSet; import java.util.Set; import android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.TextView; public class Default extends Activity { private TextView result; private String operand; private String operator; private Set<String> numbers; private Set<String> operators; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); result = (TextView) findViewById(R.id.result); } /** * Initialization of set of number values. */ private void initNumbers() { numbers = new HashSet<String>(); for (int i = 0; i < 10; i++) { numbers.add(Integer.toString(i)); } } /** * Initialization of set of operators. */ private vo...