#2 계산기 만들기

안경잡이 개발자의 안드로이드 스튜디오 강좌 2강 소스입니다.

계산기 만들기 (How To Make Calculator)

안드로이드를 공부하면서 입력한 소스 입니다.

동영상 링크 : https://www.youtube.com/watch?v=dk_AyDJL61g&index=2&list=PLRx0vPvlEmdB6sCgj_jubp8KPb1ni0VOC

동영상에 나오는 프로그램의 소스입니다.

MainActivity.java

package com.example.cadmus.a001_tutorial;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    }

    public void addClick(View v)
    {
        EditText number1 = (EditText)findViewById(R.id.number1);
        EditText number2 = (EditText)findViewById(R.id.number2);
        TextView result = (TextView)findViewById(R.id.result);

        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1+n2));
    }

    public void subtractClick(View v)
    {
        EditText number1 = (EditText)findViewById(R.id.number1);
        EditText number2 = (EditText)findViewById(R.id.number2);
        TextView result = (TextView)findViewById(R.id.result);

        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1-n2));
    }

    public void multiflyClick(View v)
    {
        EditText number1 = (EditText)findViewById(R.id.number1);
        EditText number2 = (EditText)findViewById(R.id.number2);
        TextView result = (TextView)findViewById(R.id.result);

        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1*n2));
    }

    public void devideClick(View v)
    {
        EditText number1 = (EditText)findViewById(R.id.number1);
        EditText number2 = (EditText)findViewById(R.id.number2);
        TextView result = (TextView)findViewById(R.id.result);

        int n1 = Integer.parseInt(number1.getText().toString());
        int n2 = Integer.parseInt(number2.getText().toString());
        result.setText(Integer.toString(n1/n2));
    }

}

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.cadmus.a001_tutorial.MainActivity">


    <EditText
        android:id="@+id/number1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentStart="true"
        android:layout_alignParentTop="true"
        android:ems="10"
        android:hint="첫번째숫자"
        android:inputType="textPersonName" />

    <EditText
        android:id="@+id/number2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/number1"
        android:ems="10"
        android:hint="두번째 숫자"
        android:inputType="textPersonName" />

    <Button
        android:id="@+id/addButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/number2"
        android:text="더하기"
        android:onClick="addClick"/>

    <Button
        android:id="@+id/subtractBtton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/number2"
        android:layout_toEndOf="@+id/addButton"
        android:text="빼기"
        android:onClick="subtractClick"/>

    <Button
        android:id="@+id/multiplyButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/number2"
        android:layout_toEndOf="@+id/subtractBtton"
        android:text="곱하기"
        android:onClick="multiflyClick"/>

    <Button
        android:id="@+id/devideButton"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignBottom="@+id/multiplyButton"
        android:layout_toEndOf="@+id/multiplyButton"
        android:text="나누기"
        android:onClick="devideClick"/>

    <TextView
        android:id="@+id/result"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentStart="true"
        android:layout_below="@+id/addButton"
        android:textAppearance="@style/TextAppearance.AppCompat.Display1" />
</RelativeLayout>