** 사칙연산(Queue단계별로 보기) **
0. 프로젝트명 : QueueCalculatorStep
1. 사칙연산을 Queue에 넣다 빼면서 처리
2. 화면 설명
- 4칙 연산식 : +-*/ 연산자가 포함된 계산식
- queue1 : 4칙 연산식을 queue에 각 문자열별로 넣은 값
- queue2 : 4칙 연산을 할 때 곱하기, 나누기를 먼저 하고 남은 더하기, 빼기만 남은 연산식
- pop : 아래 [pop]버튼을 클릭 시 queue에서 빼낸 하나의 문자열
- 계산 : 곱셈, 나눗셈 하는 식
- pop버튼 : queue에서 하나를빼내서 보여줌.
3. 소스
https://github.com/farmerkyh/QueueCalculatorStep
4. 화면
4. 버전
- 안드로이드 스튜디오 : v2.2.3
- Minimum SDK : API 19:Android 4.4 (Kitkat)
5. 소스목록
1. MainActivity.java
2. activity_main.xml
6. 소스
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1. MainActivity.java |
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package com.example.farmer.queuecalculatorstep;
import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Gravity;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import java.math.BigDecimal;
import java.util.LinkedList;
import java.util.Queue;
public class MainActivity extends AppCompatActivity {
Queue<String> firstQueue = new LinkedList();
Queue<String> secondQueue = new LinkedList();
TextView tv_queue1;
TextView tv_queue2;
TextView tv_pop1;
TextView tv_pop2;
TextView tv_onecalulator;
TextView tv_result;
int stepIdx = -1;
int seq = 0;
String sResult;
@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//public member 생성
tv_queue1 = (TextView)findViewById(R.id.tv_queue1);
tv_queue2 = (TextView)findViewById(R.id.tv_queue2);
tv_pop1 = (TextView)findViewById(R.id.tv_pop1);
tv_pop2 = (TextView)findViewById(R.id.tv_pop2);
tv_onecalulator = (TextView)findViewById(R.id.tv_onecalulator);
tv_result = (TextView)findViewById(R.id.tv_result);
//Button Listener 연동
Button btnStep = (Button)findViewById(R.id.btnStep);
Button btnClear = (Button)findViewById(R.id.btnClear);
btnStep.setOnClickListener(calOnclickListener);
btnClear.setOnClickListener(clearOnclickListener);
}
Button.OnClickListener calOnclickListener = new View.OnClickListener(){
@Override
public void onClick(View view) {
stepIdx++;
seq = 0;
calculatorMain();
//tv_result.setText(sResult);
}
};
//------------------------------------------------------------------------
// 사칙연사 시작
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public void calculatorMain(){
firstQueue.clear();
secondQueue.clear();
//1. 산술식을 queue에 넣기
stringParsing();
tv_queue1.setText(firstQueue.toString());
if (stepIdx==0) return; //step 1
//2. Queue에 저장 된 값 중 곱셈. 나눗셈 계산
multiplyDivideCal();
//3 Queue에 저장 된 값 중 덧셈. 뺄샘 계산
sResult = addSubtractCal();
//System.out.println("괄호 최종결과 => " + sResult);
}
//------------------------------------------------------------------------
// 1차. 문자열 Parsing
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public Queue stringParsing(){
String sNumList = ((EditText)findViewById(R.id.et_arithmetic)).getText().toString();
String sOneNum = ""; //하나의 숫자열
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;
}
//------------------------------------------------------------------------
// 곱셈, 나눗셈 계산
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes", "unchecked" })
public Queue multiplyDivideCal(){
String oneChar;
String sNum1 = "", sNum2 = "", sResult = "";
String operator = "";
BigDecimal nResult = new BigDecimal("0");
while(firstQueue.peek() != null){
oneChar = firstQueue.poll().toString();
seq++;
if (stepIdx == seq) tv_queue1.setText(firstQueue.toString()); //step
if (stepIdx == seq) tv_pop1.setText(oneChar); //step
if (stepIdx == seq) tv_pop2.setText("");
if ("+-".indexOf(oneChar) >= 0 ){
secondQueue.offer(sNum1);
secondQueue.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)) {
nResult = (new BigDecimal(sNum1)).divide(new BigDecimal(sNum2), 0, BigDecimal.ROUND_UP);
}
if (stepIdx == seq) tv_pop2.setText(sNum1 + " " + operator + " " + sNum2);
sResult = String.valueOf(nResult);
sNum1 = sResult;
sNum2 = "";
operator = "";
}
}
if (firstQueue.peek() == null) secondQueue.offer(sNum1);
if (stepIdx == seq) tv_queue2.setText(secondQueue.toString()); //step
}
return secondQueue;
}
//------------------------------------------------------------------------
// 덧셈. 뺄샘 계산
//------------------------------------------------------------------------
@SuppressWarnings({ "rawtypes" })
public String addSubtractCal(){
String operator = "";
String oneChar = "";
//if (secondQueue.peek() == null) return "";
//System.out.println("secondQueue.poll().toString()=" + secondQueue.toString());
BigDecimal nResult = new BigDecimal(secondQueue.poll().toString());
seq++;
if (stepIdx == seq) tv_queue2.setText(secondQueue.toString()); //step
if (stepIdx == seq) tv_pop1.setText(nResult.toString()); //step
if (stepIdx == seq) tv_pop2.setText("");
while(secondQueue.peek() != null){
oneChar = secondQueue.poll().toString();
seq++;
if (stepIdx == seq) tv_queue2.setText(secondQueue.toString()); //step
if (stepIdx == seq) tv_pop1.setText(oneChar); //step
if (stepIdx == seq) tv_pop2.setText("");
if ("+-".indexOf(oneChar) >= 0 ){
operator = oneChar;
}else{
if (stepIdx == seq) tv_pop2.setText(nResult + " " + operator + " " + oneChar);
if ("+".equals(operator)){
nResult = nResult.add(new BigDecimal(oneChar));
}else if ("-".equals(operator)){
nResult = nResult.subtract(new BigDecimal(oneChar));
}
operator = "";
}
}
return nResult.toString();
}
Button.OnClickListener clearOnclickListener = new View.OnClickListener(){
@Override
public void onClick(View view) {
stepIdx = -1;
seq = 0;
tv_queue1.setText("");
tv_queue2.setText("");
tv_pop1.setText("");
tv_pop2.setText("");
tv_onecalulator.setText("");
tv_result.setText("");
//Toast toast = Toast(getApplicationContext());
//toast.setText(sResult);
//toast.setDuration(Toast.LENGTH_LONG);
Toast toast = Toast.makeText(getApplicationContext(), sResult, Toast.LENGTH_SHORT);
toast.setGravity(Gravity.TOP | Gravity.RIGHT, 0, 0);
View viewToast = toast.getView();
//Toast BackgroundColor 변경
//color표기시 xml에서는 "#ffffff"로 하지만
//java코드에서는 아래와 같이 rgb로 변환하여 사용해줘야 한다.
viewToast.setBackgroundColor(Color.rgb(255,0,255));
//Toast Font Color변경
TextView tvToast = (TextView)viewToast.findViewById(android.R.id.message);
tvToast.setTextColor(Color.RED);
toast.show();
//Toast.makeText(getApplicationContext(), sResult, Toast.LENGTH_LONG).show();
tv_result.setText(sResult);
}
};
} |
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2. activity_main.xml |
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<?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="#fde002"
android:orientation="vertical"
tools:context="com.example.farmer.queuecalculatorstep.MainActivity">>
<!-- 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:text="16+12/1-2*2"
android:layout_marginRight="10dp"
android:layout_width="match_parent"
android:layout_height="30dp"
android:paddingLeft="10dp"
android:background="#ffffff"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_num" />
</RelativeLayout>
<!-- 2차 : queue1 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#e9e0f7"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_lavel1"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="queue 1"/>
<TextView
android:id="@+id/tv_queue1"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_lavel1"
android:background="#ffffff"
android:text="queue 1"/>
</RelativeLayout>
<!-- 3차 : queue2 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#e9e0f7"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_lavel2"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="queue 2"/>
<TextView
android:id="@+id/tv_queue2"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_lavel2"
android:background="#ffffff"
android:text="queue 2"/>
</RelativeLayout>
<!-- 5차 : pop1 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#e3ebf4"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_poplavel1"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="pop"/>
<TextView
android:id="@+id/tv_pop1"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_poplavel1"
android:background="#ffffff"
android:text=""/>
</RelativeLayout>
<!-- 5차 : pop2 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#e3ebf4"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_poplavel3"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="계산"/>
<TextView
android:id="@+id/tv_pop2"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_poplavel3"
android:background="#ffffff"
android:text=""/>
</RelativeLayout>
<!-- 6차 : 4칙연산 하나 계산 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#dbdee1"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_onelavel"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="4칙연산"/>
<TextView
android:id="@+id/tv_onecalulator"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_onelavel"
android:background="#ffffff"
android:text=""/>
</RelativeLayout>
<!-- 7차 : 최종 계산 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#dbdee1"
android:layout_marginTop="5dp"
android:layout_weight="1">
<TextView
android:id="@+id/tv_resultlabel"
android:padding="10dp"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_centerInParent="true"
android:text="결과"/>
<TextView
android:id="@+id/tv_result"
android:padding="10dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="10dp"
android:layout_marginRight="10dp"
android:layout_centerInParent="true"
android:layout_toRightOf="@+id/tv_resultlabel"
android:background="#ffffff"
android:text=""/>
</RelativeLayout>
<!-- 8차 : step -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#dbdee1"
android:layout_marginTop="5dp"
android:layout_weight="1">
<Button
android:id="@+id/btnStep"
android:text="POP"
android:layout_centerHorizontal="true"
android:layout_width="wrap_content"
android:paddingRight="20dp"
android:layout_height="wrap_content" />
<Button
android:id="@+id/btnClear"
android:text="Clear"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_toRightOf="@id/btnStep" />
</RelativeLayout>
<!-- 9차 : 빈공백 -->
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="0dp"
android:background="#ffffff"
android:layout_weight="0.5">
</RelativeLayout>
</LinearLayout> |
