초간단계산기

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >

<EditText
android:id="@+id/Edit1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="숫자1"
android:layout_margin="10dp"/>
<EditText
android:id="@+id/Edit2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="숫자2"
android:layout_margin="10dp"/>
<Button
android:id="@+id/BtnAdd"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="더하기" />
<Button
android:id="@+id/BtnSub"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="빼기"/>
<Button
android:id="@+id/BtnMul"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="나누기" />
<Button
android:id="@+id/BtnDiv"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="10dp"
android:text="나누기"/>
<Button
android:id="@+id/BtnRim"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="나머지값"
android:layout_margin="10dp"/>

<TextView
android:id="@+id/TextResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="계산 결과"
android:layout_margin="10dp"
android:textColor="#FF0000"
android:textSize="30dp"/>




</LinearLayout><pre style='color: rgb(0, 0, 0); font-family: "굴림체"; font-size: 9pt; background-color: rgb(255, 255, 255);'>package com.example.alswj.myapplication;

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


public class MainActivity extends AppCompatActivity {


Button btnAdd, btnSub, btnMul, btnDiv,btnRim;
EditText edit1, edit2;
TextView textResult;
String num1, num2;
Double result;


@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setTitle("초간단 계산기(수정)");

edit1 = (EditText) findViewById(R.id.Edit1);
edit2 = (EditText) findViewById(R.id.Edit2);

btnAdd = (Button) findViewById(R.id.BtnAdd);
btnSub = (Button) findViewById(R.id.BtnSub);
btnMul = (Button) findViewById(R.id.BtnMul);
btnDiv = (Button) findViewById(R.id.BtnDiv);
btnRim = (Button) findViewById(R.id.BtnRim);

textResult = (TextView) findViewById(R.id.TextResult);

btnAdd.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
num1 = edit1.getText().toString();
num2 = edit2.getText().toString();

if (num1.trim().equals("")|| num2.trim().equals("")){
Toast.makeText(getApplicationContext(),"입력 값이 비었습니다",Toast.LENGTH_SHORT)
.show();
}else {
result= Double.parseDouble(num1) + Double.parseDouble(num2);
textResult.setText("계산 결과 :" + result.toString());

}}


});
btnSub.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
num1 = edit1.getText().toString();
num2 = edit2.getText().toString();
if (num1.trim().equals("") || num2.trim().equals("")) {
Toast.makeText(getApplicationContext(), "입력 값이 비었습니다", Toast.LENGTH_SHORT)
.show();
} else {
result = Double.parseDouble(num1) - Double.parseDouble(num2);
textResult.setText("계산 결과 :" + result.toString());

}
}
});
btnMul.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
num1 = edit1.getText().toString();
num2 = edit2.getText().toString();
if (num1.trim().equals("")|| num2.trim().equals("")){
Toast.makeText(getApplicationContext(),"입력 값이 비었습니다",Toast.LENGTH_SHORT)
.show();
}else{
result = Double.parseDouble(num1) * Double.parseDouble(num2);
textResult.setText("계산 결과 :" + result.toString());

}}
});
btnDiv.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
num1 = edit1.getText().toString();
num2 = edit2.getText().toString();
if (num1.trim().equals("")|| num2.trim().equals("")) {
Toast.makeText(getApplicationContext(), "입력 값이 비었습니다", Toast.LENGTH_SHORT)
.show();
}else if(edit2.getText().toString().equals("0")){
Toast.makeText(getApplicationContext(),"0으로 나누면 안됩니다!",Toast.LENGTH_SHORT)
.show();
}else {
result = Double.parseDouble(num1) / Double.parseDouble(num2);
textResult.setText("계산 결과 :" + result.toString());
}
}
});

btnRim.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
num1 = edit1.getText().toString();
num2 = edit2.getText().toString();
if (num1.trim().equals("")|| num2.trim().equals("")){
Toast.makeText(getApplicationContext(),"입력 값이 비었습니다",Toast.LENGTH_SHORT)
.show();
}else {
result = Double.parseDouble(num1) % Double.parseDouble(num2);
textResult.setText("계산 결과 :" + result.toString());
}
}
});



}
}

출처: https://m.blog.naver.com/minjeongwow7461/221396262330