<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="fill_parent"
    android:layout_height="fill_parent" android:id="@+id/mainLayout">
    <TextView android:layout_width="fill_parent"
        android:layout_height="wrap_content" android:text="@string/hello"
        android:gravity="center_horizontal" android:textSize="48px"
        android:padding="12px" />
    <EditText android:layout_height="wrap_content" android:id="@+id/value1"
        android:hint="@string/hint1" android:inputType="numberDecimal"
        android:layout_width="fill_parent" android:textSize="48px"></EditText>
    <EditText android:layout_height="wrap_content" android:id="@+id/value2"
        android:hint="@string/hint2" android:inputType="numberDecimal"
        android:layout_width="fill_parent" android:textSize="48px"></EditText>
    <FrameLayout android:id="@+id/FrameLayout01"
        android:layout_width="wrap_content" android:layout_height="wrap_content"
        android:padding="12px" android:background="#ff0000">
        <LinearLayout android:id="@+id/LinearLayout02"
            android:layout_width="wrap_content" android:layout_height="wrap_content"
            android:orientation="horizontal" android:background="#000000"
            android:padding="4px">
            <TextView android:layout_width="wrap_content"
                android:layout_height="wrap_content" android:text="@string/resultLabel"
                android:textSize="48px" android:id="@+id/resultLabel"></TextView>
            <TextView android:layout_width="wrap_content"
                android:layout_height="wrap_content" android:id="@+id/result"
                android:textSize="48px" android:textStyle="bold"
                android:layout_marginLeft="16px"></TextView>
        </LinearLayout>
    </FrameLayout>
    <LinearLayout android:id="@+id/LinearLayout03"
        android:layout_height="wrap_content" android:layout_width="fill_parent">
        <Button android:layout_height="wrap_content" android:id="@+id/addValues"
            android:text="@string/add" android:textSize="32px"
            android:layout_width="wrap_content"></Button>
        <Button android:layout_height="wrap_content" android:id="@+id/multiplyValues"
            android:text="@string/multiply" android:textSize="32px"
            android:layout_width="wrap_content"></Button>
    </LinearLayout>
</LinearLayout>

/*
 * Copyright (c) 2010, Lauren Darcey and Shane Conder
 * All rights reserved.
 * 
 * Redistribution and use in source and binary forms, with or without modification, are 
 * permitted provided that the following conditions are met:
 * 
 * * Redistributions of source code must retain the above copyright notice, this list of 
 *   conditions and the following disclaimer.
 *   
 * * Redistributions in binary form must reproduce the above copyright notice, this list 
 *   of conditions and the following disclaimer in the documentation and/or other 
 *   materials provided with the distribution.
 *   
 * * Neither the name of the <ORGANIZATION> nor the names of its contributors may be used
 *   to endorse or promote products derived from this software without specific prior 
 *   written permission.
 *   
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY 
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT 
 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED 
 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR 
 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF 
 * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 * <ORGANIZATION> = Mamlambo
 */
package com.mamlambo.article.simplecalc;


import android.app.Activity;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        final String LOG_TAG = "MainScreen";
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        final EditText value1 = (EditText) findViewById(R.id.value1);
        final EditText value2 = (EditText) findViewById(R.id.value2);

        final TextView result = (TextView) findViewById(R.id.result);

        Button addButton = (Button) findViewById(R.id.addValues);
        addButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                try {
                    int val1 = Integer.parseInt(value1.getText().toString());
                    int val2 = Integer.parseInt(value2.getText().toString());

                    Integer answer = val1 + val2;
                    result.setText(answer.toString());
                } catch (Exception e) {
                    Log.e(LOG_TAG, "Failed to add numbers", e);
                }
            }
        });

        Button multiplyButton = (Button) findViewById(R.id.multiplyValues);
        multiplyButton.setOnClickListener(new OnClickListener() {

            public void onClick(View v) {
                try {
                    int val1 = Integer.parseInt(value1.getText().toString());
                    int val2 = Integer.parseInt(value2.getText().toString());

                    Integer answer = val1 * val2;
                    result.setText(answer.toString());
                } catch (Exception e) {
                    Log.e(LOG_TAG, "Failed to multiply numbers", e);
                }
            }
        });
    }
}

package com.mamlambo.article.simplecalc.test;

import android.test.ActivityInstrumentationTestCase2;

public class MathValidation extends
       ActivityInstrumentationTestCase2<MainActivity> {   

   public MathValidation(String name) {
       super(name);
   }

   protected void setUp() throws Exception {
       super.setUp();
   }
}

public MathValidation() {
       super("com.mamlambo.article.simplecalc", MainActivity.class);
}

package com.mamlambo.article.simplecalc.test;

import android.test.ActivityInstrumentationTestCase2;
import android.widget.TextView;
import com.mamlambo.article.simplecalc.MainActivity;
import com.mamlambo.article.simplecalc.R;

public class MathValidation extends ActivityInstrumentationTestCase2<MainActivity> {

   private TextView result;

   public MathValidation() {
       super ("com.mamlambo.article.simplecalc", MainActivity.class);
   }

   @Override
   protected void setUp() throws Exception {
       super.setUp();

       MainActivity mainActivity = getActivity();

       result = (TextView) mainActivity.findViewById(R.id.result);
   }
}

private static final String NUMBER_24 = "2 4 ENTER ";
private static final String NUMBER_74 = "7 4 ENTER ";
private static final String ADD_RESULT = "98";

public void testAddValues() {

   sendKeys(NUMBER_24);
   // now on value2 entry
   sendKeys(NUMBER_74);
   // now on Add button
   sendKeys("ENTER");

   // get result
   String mathResult = result.getText().toString();
   assertTrue("Add result should be 98", mathResult.equals(ADD_RESULT));
}