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MainActivity.java
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package com.ktds.mycalculator;
import android.os.Bundle;
import android.support.v7.app.ActionBarActivity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class MainActivity extends ActionBarActivity {
private EditText edtResult;
private Button btnOne, btnTwo, btnThree, btnFore, btnFive, btnSix, btnSeven, btnEight, btnNine, btnZero, btnDoubleZero;
private Button btnResult, btnMinus, btnPlus, btnMul, btnDiv;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
edtResult = (EditText) findViewById(R.id.edtResult);
btnOne = (Button) findViewById(R.id.btnOne);
btnTwo = (Button) findViewById(R.id.btnTwo);
btnThree = (Button) findViewById(R.id.btnThree);
btnFore = (Button) findViewById(R.id.btnFore);
btnFive = (Button) findViewById(R.id.btnFive);
btnSix = (Button) findViewById(R.id.btnSix);
btnSeven = (Button) findViewById(R.id.btnSeven);
btnEight = (Button) findViewById(R.id.btnEight);
btnNine = (Button) findViewById(R.id.btnNine);
btnZero = (Button) findViewById(R.id.btnZero);
btnDoubleZero = (Button) findViewById(R.id.btnDoubleZero);
btnMinus = (Button) findViewById(R.id.btnMinus);
btnPlus = (Button) findViewById(R.id.btnPlus);
btnMul = (Button) findViewById(R.id.btnMul);
btnDiv = (Button) findViewById(R.id.btnDiv);
btnResult = (Button) findViewById(R.id.btnResult);
btnOne.setOnClickListener(new MyButtornClickListener());
btnTwo.setOnClickListener(new MyButtornClickListener());
btnThree.setOnClickListener(new MyButtornClickListener());
btnFore.setOnClickListener(new MyButtornClickListener());
btnFive.setOnClickListener(new MyButtornClickListener());
btnSix.setOnClickListener(new MyButtornClickListener());
btnSeven.setOnClickListener(new MyButtornClickListener());
btnEight.setOnClickListener(new MyButtornClickListener());
btnNine.setOnClickListener(new MyButtornClickListener());
btnZero.setOnClickListener(new MyButtornClickListener());
btnDoubleZero.setOnClickListener(new MyButtornClickListener());
btnMinus.setOnClickListener(new MyButtornClickListener());
btnPlus.setOnClickListener(new MyButtornClickListener());
btnMul.setOnClickListener(new MyButtornClickListener());
btnDiv.setOnClickListener(new MyButtornClickListener());
btnResult.setOnClickListener(new MyButtornClickListener());
}
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
/*
onPause 직전에 실행되며, 초기화 되는 데이터를 보존하기 위해 outState에 저장한다.
*/
outState.putInt("tempNumber",tempNumber);
outState.putString("oper", oper);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
/*
onResum 직전에 실행되며, Bundle의 데이터를 꺼내온다.
*/
tempNumber = savedInstanceState.getInt("tempNumber");
oper = savedInstanceState.getString("oper");
}
// private static를 사용하면 위의 메소드를 사용하지 않아도 된다.
// 하지만, 이 변수 말고도 다른 변수들이 많으면 메모리 관리상 위의 메소드를 활용하는것이 좋다.
String oper = "";
int tempNumber = 0;
private class MyButtornClickListener implements View.OnClickListener{
@Override
public void onClick(View v) {
int id = v.getId();
String numbers = edtResult.getText().toString();
if(numbers.equals("0")){
numbers = "";
}
else if(id == R.id.btnZero){
edtResult.setText(numbers+"0");
}
else if(id == R.id.btnDoubleZero){
edtResult.setText(numbers+"00");
}
else if(id == R.id.btnOne){
edtResult.setText(numbers+"1");
}
else if(id == R.id.btnTwo){
edtResult.setText(numbers+"2");
}
else if(id == R.id.btnThree){
edtResult.setText(numbers+"3");
}
else if(id == R.id.btnFore){
edtResult.setText(numbers+"4");
}
else if(id == R.id.btnFive){
edtResult.setText(numbers+"5");
}
else if(id == R.id.btnSix){
edtResult.setText(numbers+"6");
}
else if(id == R.id.btnSeven){
edtResult.setText(numbers+"7");
}
else if(id == R.id.btnEight) {
edtResult.setText(numbers + "8");
}
else if(id == R.id.btnNine) {
edtResult.setText(numbers + "9");
}
if(id == R.id.btnPlus){
tempNumber = Integer.parseInt(numbers);
edtResult.setText("0");
oper = "+";
}
else if(id == R.id.btnMinus){
tempNumber = Integer.parseInt(numbers);
edtResult.setText("0");
oper = "-";
}
else if(id == R.id.btnMul){
tempNumber = Integer.parseInt(numbers);
edtResult.setText("0");
oper = "*";
}
else if(id == R.id.btnDiv){
tempNumber = Integer.parseInt(numbers);
edtResult.setText("0");
oper = "/";
}
if(id==R.id.btnResult){
int tempNumber2 = Integer.parseInt(numbers);
int result = 0;
if(oper.equals("+")){
result = tempNumber+tempNumber2;
}
else if(oper.equals("-")){
result = tempNumber-tempNumber2;
}
else if(oper.equals("*")){
result = tempNumber*tempNumber2;
}
else if(oper.equals("/")){
result = tempNumber/tempNumber2;
}
edtResult.setText(result+"");
}
}
}
}
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cs |
activity_main.xml
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<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:id="@+id/edtResult"
android:hint="숫자 입력"
android:layout_gravity="fill_vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btnSeven"
android:text="7"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnEight"
android:text="8"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnNine"
android:text="9"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnDiv"
android:text="/"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btnFore"
android:text="4"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnFive"
android:text="5"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnSix"
android:text="6"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnMul"
android:text="*"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btnThree"
android:text="3"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnTwo"
android:text="2"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnOne"
android:text="1"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnPlus"
android:text="+"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal">
<Button
android:id="@+id/btnZero"
android:text="0"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnDoubleZero"
android:text="00"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnResult"
android:text="="
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
<Button
android:id="@+id/btnMinus"
android:text="-"
android:layout_weight="1"
android:layout_width="0dp"
android:layout_height="match_parent" />
</LinearLayout>
</LinearLayout>
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cs |
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