android - 스택 계산기(Stack Calculator)

gistfile1.java

///////////////////////////////// CalculatorActivity.java ////////////////////////////////

package com.hong.Calculator;

import java.util.Stack;
import java.util.StringTokenizer;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class CalculatorActivity extends Activity {
    /** Called when the activity is first created. */
	int num = 0;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ((Button) findViewById(R.id.Button01)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button02)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button03)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button04)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button05)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button06)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button07)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button08)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button09)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Button00)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.plus)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.minus)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.mul)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.div)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.result)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Lefe)).setOnClickListener(on_Click);
        ((Button) findViewById(R.id.Right)).setOnClickListener(on_Click);
        
        ((Button) findViewById(R.id.clear)).setOnClickListener(new Button.OnClickListener(){
			public void onClick(View v) {
				// TODO Auto-generated method stub
				EditText et = ((EditText) findViewById(R.id.EditText01));
				et.setText("0");
			}
        });
    }
    
    private View.OnClickListener on_Click = new View.OnClickListener() {
		public void onClick(View v) {
			// TODO Auto-generated method stub
			String id = null;
			String s;
			EditText et = ((EditText) findViewById(R.id.EditText01));
			if(et.getText().toString().charAt(0) == '0') et.setText("");
			
			switch(v.getId()){
				case R.id.Button00 :
					id = "0";
					break;
				case R.id.Button01 :
					id = "1";
					break;
				case R.id.Button02 :
					id = "2";
					break;
				case R.id.Button03 :
					id = "3";
					break;
				case R.id.Button04 :
					id = "4";
					break;
				case R.id.Button05 :
					id = "5";
					break;
				case R.id.Button06 :
					id = "6";
					break;
				case R.id.Button07 :
					id = "7";
					break;
				case R.id.Button08 :
					id = "8";
					break;
				case R.id.Button09 :
					id = "9";
					break;
				case R.id.plus :
					id = "+";
					break;
				case R.id.minus :
					id = "-";
					break;
				case R.id.mul:
					id = "*";
					break;
				case R.id.div :
					id = "/";
					break;
				case R.id.result :
					s = et.getText() + " = " + Calc(et.getText().toString());
					et.setText(s);
					return;
				case R.id.Lefe :
					id = "(";
					break;
				case R.id.Right :
					id = ")";
					break;
				default :
					break;
			}
			
			s = et.getText() + id;
			et.setText(s);
		}
	};
    
	private String Calc(String str){
		if(str.indexOf('(') != -1){
			int fs = str.indexOf('(');
			int ls = str.lastIndexOf(')');
			String s = Calc(str.substring(fs + 1, ls));
			str = str.substring(0, fs) + s + str.substring(ls+1, str.length());
		}
		
		int cnt = 0;
		Stack <Integer> Stk_Num = new Stack <Integer>();
		StringTokenizer ST_Num = new StringTokenizer(str,"+-/* ");
		StringTokenizer ST_Oper = new StringTokenizer(str,"1234567890 ");
		
		Stk_Num.push(Integer.parseInt(ST_Num.nextToken()));
		while(ST_Num.hasMoreTokens()){
			char oper = ST_Oper.nextToken().charAt(0);
			String num = ST_Num.nextToken();
			int a;
			
			if(oper == '*'){
				a = Stk_Num.pop();
				a *= Integer.parseInt(num);
				Stk_Num.push(a);
			}
			else if(oper == '/'){
				a = Stk_Num.pop();
				a /= Integer.parseInt(num);
				Stk_Num.push(a);
			}
			else if(oper == '+'){
				Stk_Num.push(Integer.parseInt(num));
			}
			else if(oper == '-'){
				Stk_Num.push(-1 * (Integer.parseInt(num)));
			}
		}
		
		while(!Stk_Num.isEmpty()){
			cnt += Stk_Num.pop();
		}
		
		return Integer.toString(cnt);
	}
}

gistfile2.xml

///////////////////////////////// main.xml ////////////////////////////////

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
	android:orientation="vertical" android:layout_width="fill_parent"
	android:layout_height="fill_parent">
		<EditText android:text="0" android:id="@+id/EditText01"
			android:layout_width="wrap_content" android:layout_height="wrap_content"
			></EditText>
		<TableRow>
			<Button android:text="1" android:id="@+id/Button01"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="2" android:id="@+id/Button02"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="3" android:id="@+id/Button03"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="+" android:id="@+id/plus"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="(" android:id="@+id/Lefe"
				android:layout_width="55px" android:layout_height="55px"></Button>
		</TableRow>
		<TableRow>
			<Button android:text="4" android:id="@+id/Button04"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="5" android:id="@+id/Button05"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="6" android:id="@+id/Button06"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="-" android:id="@+id/minus"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text=")" android:id="@+id/Right"
				android:layout_width="55px" android:layout_height="55px"></Button>
		</TableRow>
		<TableRow>
			<Button android:text="7" android:id="@+id/Button07"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="8" android:id="@+id/Button08"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="9" android:id="@+id/Button09"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="*" android:id="@+id/mul"
				android:layout_width="55px" android:layout_height="55px"></Button>
		</TableRow>
		<TableRow>
			<Button android:text="0" android:id="@+id/Button00"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="=" android:id="@+id/result"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="clear" android:id="@+id/clear"
				android:layout_width="55px" android:layout_height="55px"></Button>
			<Button android:text="/" android:id="@+id/div"
				android:layout_width="55px" android:layout_height="55px"></Button>
		</TableRow>
</TableLayout>