** 사칙연산(괄호 가능) **
0. 프로젝트명 : KeyPadAll
1. 사칙연산을 Queue에 넣다 빼면서 처리
2. 괄호 가능
3. 화면 :
5. 안드로이드 버전
- 스튜디오 : v2.2.3
- Minumum SDK : API 19:Android 4.4. (KitKat)
6. 소스목록
1. MainActivity.java
2. Calculator.java
3. activity_main.xml
4. drawable/border_calbutton.xml
5. drawable/border_layout.xml
6. values/colors.xml
6. 소스
|
|
1. MainActivity.java |
|
|
package com.example.farmer.keypadall;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
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 {
EditText arithmetic;
TextView result;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
arithmetic = (EditText)findViewById(R.id.et_arithmetic);
result = (TextView)findViewById(R.id.tv_result);
((TextView)findViewById(R.id.tv_mqrquee)).setSelected(true);
//arithmetic.requestFocus(); //포커스 주기
arithmetic.setFocusableInTouchMode(false); // 결과 box에 edit막기 : ok
arithmetic.setKeyListener(null); //key 가 안눌림. 하지만 keypad가 보임
}
//---------------------------------------------------------------------------
// 사칙연산자 클릭 시
// - 사칙연산자가 중복 시 최종연산자로 대체
//---------------------------------------------------------------------------
public void arithmeticOrganOnClick(View view){
String sCurrNum = arithmetic.getText().toString();
if (sCurrNum.length() == 0) return;
String lastChar = sCurrNum.substring(sCurrNum.length()-1, sCurrNum.length());
if ("+-*/".indexOf(lastChar) >= 0){
arithmetic.setText( sCurrNum.substring(0, sCurrNum.length()-1) + ((Button)view).getText());
}else{
arithmetic.setText( sCurrNum + ((Button)view).getText());
}
}
//---------------------------------------------------------------------------
// 숫자 클릭 시
//---------------------------------------------------------------------------
public void numberOnClick(View view){
arithmetic.setText( arithmetic.getText().toString() + ((Button)view).getText());
}
//---------------------------------------------------------------------------
// 소수점 클릭 시
//---------------------------------------------------------------------------
public void pointOnClick(View view){
arithmetic.setText( arithmetic.getText().toString() + ((Button)view).getText());
}
//---------------------------------------------------------------------------
// BackClear 버튼 클릭 시
//---------------------------------------------------------------------------
public void oneCharClearOnClick(View view){
String sCurrNum = arithmetic.getText().toString(); //? getText() : Return이 Editable ?
//Log.d("farm-1", sNum1); //?log가 안보임 ?
if (sCurrNum.length() > 0) {
//Log.d("farm-2", sNum1);
sCurrNum = sCurrNum.substring(0, sCurrNum.length() - 1);
//Log.d("farm-3", sNum1);
arithmetic.setText(sCurrNum);
//포커스를 맨 뒤로 하기
//Editable editable = arithmetic.getText();
//Selection.setSelection(editable, editable.length());
}
}
//---------------------------------------------------------------------------
// Clear 버튼 클릭 시
//---------------------------------------------------------------------------
public void allClearOnClick(View view){
arithmetic.setText("");
result.setText("");
}
//---------------------------------------------------------------------------
// ()괄호 버튼 클릭 시
// 1. 숫자 다음에 ( 여는 괄호는 올 수 없음
// 2. 사칙연산자 다음이 ) 닫는 괄호는 올 수 없음
//---------------------------------------------------------------------------
public void bracketOnclick(View view){
String sCurrNum = arithmetic.getText().toString();
switch (view.getId()){
case R.id.bt_braketLeft:
if (sCurrNum.length() > 0) {
String lastChar = sCurrNum.substring(sCurrNum.length()-1, sCurrNum.length());
Toast.makeText(MainActivity.this, "lastChar=" + lastChar, Toast.LENGTH_SHORT).show();
if ("0123456789".indexOf(lastChar) >= 0) return;
}
break;
case R.id.bt_braketRight:
if (sCurrNum.length() > 0) {
String lastChar = sCurrNum.substring(sCurrNum.length()-1, sCurrNum.length());
if ("+0*/".indexOf(lastChar) >= 0) return;
}
break;
}
arithmetic.setText( arithmetic.getText().toString() + ((Button)view).getText());
}
//---------------------------------------------------------------------------
// 계산 버튼 클릭 시
//---------------------------------------------------------------------------
public void calculatorOnClick(View view) throws Exception{
Calculator calculator = new Calculator();
String sCurrNum = arithmetic.getText().toString();
String resultVal = calculator.bracketCalMain(sCurrNum);
result.setText(resultVal);
}
} |
|
|
2. Calculator.java |
|
|
package com.example.farmer.keypadall;
import java.util.LinkedList;
import java.util.Queue;
import java.math.BigDecimal;
/**
* Created by kyh on 2017-01-02.
*/
public class Calculator {
//------------------------------------------------------------------------
// 괄호 까지 존재하는 사칙연사
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public static String bracketCalMain(String sNumList) throws Exception{
//0. ( ) 괄호 갯수 검증
if (checkBracket(sNumList) == false) return "괄호 () 갯수가 Match되지 않습니다.";
// 1. 1차 문자열 Parsing
Queue firstQueue = new LinkedList();
firstQueue = stringParsing(sNumList);
System.out.println("----------------------------------------------");
System.out.println("괄호 1차 => " + firstQueue.toString());
// 2. 2차 괄호안 계산
Queue secondQueue = new LinkedList();
String oneChar;
while(firstQueue.peek() != null){
oneChar = firstQueue.poll().toString();
//System.out.println("괄호 => " + oneChar);
if ("()".indexOf(oneChar) >= 0){
//괄호안 계산 (firstQueue)
secondQueue.offer(braketInCal(firstQueue));
}else{
secondQueue.offer(oneChar);
}
}
//3. Queue에 저장 된 값 중 곱셈. 나눗셈 계산
secondQueue = multiplyDivideCal(secondQueue);
//4. Queue에 저장 된 값 중 덧셈. 뺄샘 계산
String sResult = addSubtractCal(secondQueue);
System.out.println("괄호 최종결과 => " + sResult);
return sResult;
}
//( ) 괄호 갯수 검증
public static boolean checkBracket(String sNumList){
int count1=0, count2=0;
for(int i=0; i<sNumList.length(); i++){
if ("(".equals(sNumList.substring(i, i+1))){
count1 ++;
}else if (")".equals(sNumList.substring(i, i+1))){
count2 ++;
}
}
if (count1 == count2)
return true;
else{
System.out.println("괄호 () 갯수가 Match되지 않습니다.");
return false;
}
}
//------------------------------------------------------------------------
// 1차. 문자열 Parsing
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Queue stringParsing(String sNumList){
String sOneNum = ""; //하나의 숫자열
Queue firstQueue = new LinkedList();
for(int i=0; i<sNumList.length(); i++){
String oneChar = sNumList.substring(i, i+1);
if ("+-*/()".indexOf(oneChar) >= 0 ){
// 3+(3 과 같이 4칙연산자와 괄호가 동시에 존재 하는 경우 때문
if (!"".equals(sOneNum)) firstQueue.offer(sOneNum);
firstQueue.offer(oneChar);
sOneNum = "";
}else{
sOneNum += oneChar;
if (i+1 == sNumList.length()){
firstQueue.offer(sOneNum);
}
}
}
return firstQueue;
}
//------------------------------------------------------------------------
// 2차. 괄호 내부 계산 (재귀적 호출)
//------------------------------------------------------------------------
@SuppressWarnings({ "unchecked", "rawtypes" })
public static String braketInCal(Queue firstQueue) throws Exception{
String oneChar;
//1. 괄호 내부에 존재 하는 값을 Queue에 저장
Queue secondQueue = new LinkedList();
while(firstQueue.peek() != null){
oneChar = firstQueue.poll().toString();
if ("(".equals(oneChar)){
//괄호안 계산 (firstQueue)
secondQueue.offer(braketInCal(firstQueue));
}else if (")".equals(oneChar)){
break; //닫기 괄호가 나오면 stop
}else{
secondQueue.offer(oneChar);
}
}
System.out.println("괄호 2차 => " + secondQueue.toString());
//2. Queue에 저장 된 값 중 곱셈. 나눗셈 계산
secondQueue = multiplyDivideCal(secondQueue);
//3. Queue에 저장 된 값 중 덧셈. 뺄샘 계산
String sResult = addSubtractCal(secondQueue);
return sResult;
}
//------------------------------------------------------------------------
// 곱셈, 나눗셈 계산
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public static Queue multiplyDivideCal(Queue inQueue) throws Exception{
Queue outQueue = new LinkedList();
String oneChar;
String sNum1 = "", sNum2 = "", sResult = "";
String operator = "";
BigDecimal nResult = new BigDecimal("0");
while(inQueue.peek() != null){
oneChar = inQueue.poll().toString();
if ("+-".indexOf(oneChar) >= 0 ){
outQueue.offer(sNum1);
outQueue.offer(oneChar);
sNum1 = "";
}else if ("*/".indexOf(oneChar) >= 0 ) {
operator = oneChar;
}else{
if ("".equals(sNum1)){
sNum1 = oneChar;
}else if ("".equals(sNum2)) {
sNum2 = oneChar;
if ("*".equals(operator)) {
nResult = (new BigDecimal(sNum1)).multiply(new BigDecimal(sNum2));
}else if ("/".equals(operator)) {
if ("0".equals(sNum2)){
throw new Exception("나눗셈 분모에 0 이 존재 합니다.");
}
nResult = (new BigDecimal(sNum1)).divide(new BigDecimal(sNum2), 6, BigDecimal.ROUND_UP);
}
sResult = String.valueOf(nResult);
sNum1 = sResult;
sNum2 = "";
operator = "";
}
}
if (inQueue.peek() == null) outQueue.offer(sNum1);
}
return outQueue;
}
//------------------------------------------------------------------------
// 덧셈. 뺄샘 계산
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes" })
public static String addSubtractCal(Queue inQueue){
String operator = "";
String oneChar = "";
BigDecimal nResult = new BigDecimal(inQueue.poll().toString());
while(inQueue.peek() != null){
oneChar = inQueue.poll().toString();
if ("+-".indexOf(oneChar) >= 0 ){
operator = oneChar;
}else{
if ("+".equals(operator)){
nResult = nResult.add(new BigDecimal(oneChar));
}else if ("-".equals(operator)){
nResult = nResult.subtract(new BigDecimal(oneChar));
}
operator = "";
}
}
return nResult.toString();
}
}
|
|
|
3. activity_main.xml |
|
|
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/activity_keypad"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#d1cdcd"
android:orientation="vertical"
tools:context="com.example.farmer.keypadall.MainActivity">
<!-- 0차 : mqrquee -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#00ffffff"
android:layout_weight="1">
<TextView
android:id="@+id/tv_mqrquee"
android:textSize="30dp"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="농부의 4칙연산 계산기. 자체개발 완료.. 으미 힘든거~~~~~~"
android:ellipsize="marquee"
android:focusable="true"
android:marqueeRepeatLimit="marquee_forever"
android:singleLine="true"/>
</RelativeLayout>
<!-- 1차 : 산술식 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#b4b2b7"
android:layout_weight="1">
<TextView
android:id="@+id/tv_num"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="4칙 연산식"/>
<EditText
android:id="@+id/et_arithmetic"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="30dp"
android:hint="4칙 연산식을 입력 하시오."
android:paddingLeft="10dp"
android:background="#ffffff"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_num" />
</RelativeLayout>
<!-- 2차 : 결과 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#d7c6ed"
android:layout_weight="1">
<TextView
android:id="@+id/tv_resultLabel"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_centerInParent="true"
android:layout_alignParentLeft="true"
android:text="Result"/>
<TextView
android:id="@+id/tv_result"
android:textSize="20dp"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="30dp"
android:text=""
android:paddingLeft="10dp"
android:background="#e4e4dd"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_resultLabel"/>
</RelativeLayout>
<!-- 3차 : 빈 공백 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#fcfcfc"
android:layout_weight="0.2">
</RelativeLayout>
<!-- 4차 : 기타 C, ( ) / "#6a00ff" -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="@drawable/border_layout"
android:layout_weight="1">
<Button
android:id="@+id/bt_clear"
android:onClick="allClearOnClick"
android:text="C"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_marginLeft="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
<Button
android:id="@+id/bt_braketLeft"
android:onClick="bracketOnclick"
android:text="("
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_clear"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
<Button
android:id="@+id/bt_braketRight"
android:onClick="bracketOnclick"
android:text=")"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_braketLeft"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
<Button
android:id="@+id/bt_divide"
android:onClick="arithmeticOrganOnClick"
android:text="/"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_braketRight"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
</RelativeLayout>
<!-- 5차 : 7,8,9, * -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="@drawable/border_layout"
android:layout_weight="1">
<Button
android:id="@+id/bt_seven"
android:onClick="numberOnClick"
android:text="7"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_eight"
android:onClick="numberOnClick"
android:text="8"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_seven"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_nine"
android:onClick="numberOnClick"
android:text="9"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_eight"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_multiply"
android:onClick="arithmeticOrganOnClick"
android:text="*"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_nine"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
</RelativeLayout>
<!-- 6차 : 4,5,6,- -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="@drawable/border_layout"
android:layout_weight="1">
<Button
android:id="@+id/bt_four"
android:onClick="numberOnClick"
android:text="4"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_five"
android:onClick="numberOnClick"
android:text="5"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_four"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_six"
android:onClick="numberOnClick"
android:text="6"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_five"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_minus"
android:onClick="arithmeticOrganOnClick"
android:text="-"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_six"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
</RelativeLayout>
<!-- 7차 : 1,2,3,+ -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="@drawable/border_layout"
android:layout_weight="1">
<Button
android:id="@+id/bt_one"
android:onClick="numberOnClick"
android:text="1"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_two"
android:onClick="numberOnClick"
android:text="2"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_one"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_three"
android:onClick="numberOnClick"
android:text="3"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_toRightOf="@+id/bt_two"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_plus"
android:onClick="arithmeticOrganOnClick"
android:text="+"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_three"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
</RelativeLayout>
<!-- 8차 : 0, . <- = -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="@drawable/border_layout"
android:layout_weight="1">
<Button
android:id="@+id/bt_zero"
android:onClick="numberOnClick"
android:text="0"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="match_parent"
android:layout_marginLeft="30dp"
android:layout_alignParentLeft="true"
android:layout_centerVertical="true" />
<Button
android:id="@+id/bt_point"
android:onClick="pointOnClick"
android:text="."
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_zero"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
<Button
android:id="@+id/bt_back"
android:onClick="oneCharClearOnClick"
android:text="←"
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_point"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
<Button
android:id="@+id/bt_calculator"
android:onClick="calculatorOnClick"
android:text="="
android:textSize="30dp"
android:layout_width="75dp"
android:layout_height="45dp"
android:layout_toRightOf="@+id/bt_back"
android:layout_centerVertical="true"
android:background="@drawable/border_calbutton"/>
</RelativeLayout>
<!-- 9차 : 빈공백 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#00ffffff"
android:layout_weight="0.5">
</RelativeLayout>
</LinearLayout> |
|
|
4. drawable/border_calbutton.xml |
|
|
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 설정된 위젯의 background를 설정
1. 아래 body설정 부분에서 전체영역이 설정 되면 이 background는 아무 표시가 안난다.
2. 아래 body설정 부분에서 top,bottom,left,right에 2dp씩 설정 되었기에
이 2dp만큼 아래 부분에 설정된 모양(rectangle)과 색깔(#f9c7cc)이 보인다.
-->
<item>
<shape android:shape="rectangle">
<solid android:color="#f9c7cc" />
</shape>
</item>
<!-- 설정된 위젯의 Body를 설정
1. top,bottom,left,right 에 2dp 설정
2. shape : body를 사각형으로 설정
3. color : body에 color지정
-->
<item android:top="2dp" android:bottom="2dp" android:left="2dp" android:right="2dp">
<shape android:shape="rectangle">
<solid android:color="#d4d2d2" />
</shape>
</item>
</layer-list>
|
|
|
5. drawable/border_layout.xml |
|
|
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- 설정된 위젯의 background를 설정
1. 아래 body설정 부분에서 전체영역이 설정 되면 이 background는 아무 표시가 안난다.
2. 아래 body설정 부분에서 top, bottom에 2dp씩 설정 되었기에
이 2dp만큼 아래 부분에 설정된 모양(oval)과 색깔(#6a00ff)이 보인다.
-->
<item>
<shape android:shape="oval">
<solid android:color="#6a00ff" />
</shape>
</item>
<!-- 설정된 위젯의 Body를 설정
1. top, bottom 에 2dp 설정
2. shape : body를 사각형으로 설정
3. color : body에 color지정
-->
<item android:top="2dp" android:bottom="2dp">
<shape android:shape="rectangle">
<solid android:color="#eeffffff" />
</shape>
</item>
</layer-list>
|
|
|
6. values/colors.xml |
|
|
<?xml version="1.0" encoding="utf-8"?>
<resources>
<color name="colorPrimary">#3F51B5</color>
<color name="colorPrimaryDark">#303F9F</color>
<color name="colorAccent">#FF4081</color>
<drawable name="bg_select">#2196F3</drawable>
<drawable name="bg">#EEEEEE</drawable>
</resources> |
