android - 계산기

gistfile1.java

///////////////////////// TestActivity //////////////////////////////////////

package com.begin;

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

public class TestActivity extends Activity {
    /** Called when the activity is first created. */
	private int num = 0;
	private int tot = 0;
	private char flag;
	
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        
        ((Button) findViewById(R.id.Button01)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button02)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button03)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button04)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button05)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button06)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button07)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button08)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button09)).setOnClickListener(on_ClickNum);
        ((Button) findViewById(R.id.Button00)).setOnClickListener(on_ClickNum);
        
        ((Button) findViewById(R.id.plus)).setOnClickListener(on_ClickOper);
        ((Button) findViewById(R.id.minus)).setOnClickListener(on_ClickOper);
        ((Button) findViewById(R.id.mul)).setOnClickListener(on_ClickOper);
        ((Button) findViewById(R.id.div)).setOnClickListener(on_ClickOper);
        
        ((Button) findViewById(R.id.result)).setOnClickListener(new Button.OnClickListener(){
			public void onClick(View v) {
				// TODO Auto-generated method stub
				String result = null;
				EditText et = ((EditText) findViewById(R.id.EditText01));
				
				switch(flag){
					case '+' :
						tot += num;
						break;
					case '*' :
						tot *= num;
						break;
					case '-' :
						tot -= num;
						break;
					case '/' :
						tot /= num;
						break;
					default :
						break;
				}
				result = Integer.toString(tot);
				et.setText(result);
				num = tot;
			}
        });
        
        ((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));
				num = 0;
				et.setText("0");
			}
        });
    }
    
    private View.OnClickListener on_ClickOper = new View.OnClickListener() {
		public void onClick(View v) {
			// TODO Auto-generated method stub
			tot = num;
			num = 0;
			switch(v.getId()){
				case R.id.plus :
					flag = '+';
					break;
				case R.id.minus :
					flag = '-';
					break;
				case R.id.mul:
					flag = '*';
					break;
				case R.id.div :
					flag = '/';
					break;
				default :
					break;
			}
		}
	};
    
    private View.OnClickListener on_ClickNum = 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));
			
			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;
				default :
					break;
			}
			
			if(num == 0) et.setText("");
			s = et.getText() + id;
			et.setText(s);
			num = Integer.parseInt(s);
		}
	};
}

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>
		</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>
		</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>