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아직 미완성 입ㄴ니다

<?xml version="1.0" encoding="utf-8"?>
<TableLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:stretchColumns="1" >

    <TextView android:gravity="center"
        android:id="@+id/num"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TableRow>

        <TextView
            android:padding="10dp"
            android:text="이름 : "
            android:textSize="30sp" />

        <EditText
            android:id="@+id/name"
            android:padding="10dp"
            android:singleLine="true"
            android:hint="이름 입력" />
    </TableRow>

    <TableRow>

        <TextView
            android:padding="10dp"
            android:text="국어 : "
            android:textSize="30sp" />

        <EditText
            android:id="@+id/korean"
            android:inputType="numberDecimal"
            android:padding="10dp"
            android:singleLine="true" />
    </TableRow>

    <TableRow>

        <TextView
            android:padding="10dp"
            android:text="영어 : "
            android:textSize="30sp" />

        <EditText
            android:id="@+id/english"
            android:inputType="numberDecimal"
            android:padding="10dp"
            android:singleLine="true" />
    </TableRow>

    <TableRow>

        <TextView
            android:padding="10dp"
            android:text="수학 : "
            android:textSize="30sp" />

        <EditText
            android:id="@+id/math"
            android:inputType="numberDecimal"
            android:padding="10dp"
            android:singleLine="true" />
    </TableRow>


    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:orientation="horizontal" >


        <Button
            android:id="@+id/add"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="추가"
            android:textSize="30sp" />
        <Button
            android:id="@+id/mod"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="수정"
            android:textSize="30sp" />
        <Button
            android:id="@+id/del"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="삭제"
            android:textSize="30sp" />
        </LinearLayout>
<LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:orientation="vertical" >
        <ListView
            android:id="@android:id/list"
            android:layout_width="fill_parent"
            android:layout_height="fill_parent" />
    </LinearLayout>

</TableLayout>

package kr.vichara.grade;

import java.util.ArrayList;
import android.app.ListActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class Homework_grade extends ListActivity {
	int a1, a2, a3, avg, add1,p,mode;
	String name2, add2, avg2;
	Button add, mod, del;
	EditText korean, english, math, name;
	TextView num;
	String[] items;
	ArrayList list;
	ArrayAdapter adapter;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.main);

		num = (TextView) findViewById(R.id.num);
		add = (Button) findViewById(R.id.add);
		mod = (Button) findViewById(R.id.mod);
		del = (Button) findViewById(R.id.del);
		korean = (EditText) findViewById(R.id.korean);
		english = (EditText) findViewById(R.id.english);
		name = (EditText) findViewById(R.id.name);
		math = (EditText) findViewById(R.id.math);
		list = new ArrayList();

		//추가
		add.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				if(R.id.add == v.getId()){
					mode=v.getId();
					Process();
					String b[] = { "이름 : ", name.getText().toString(),
							" 총점 : ", add2, " 평균 : ", avg2 };
					list.add(0, b[0] + b[1] + b[2] + b[3] + b[4] + b[5]);
					Clear();
				}
			}
		});
		//수정
		mod.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {

				if(R.id.mod == v.getId()){
					if(name != null && korean != null && english != null && math != null){

						mode=v.getId();
						Process();
						String b[] = { "이름 : ", name.getText().toString(),
								" 총점 : ", add2, " 평균 : ", avg2 };
						list.set(p, b[0] + b[1] + b[2] + b[3] + b[4] + b[5]);
						Clear();

					}else{
						num.setText("수정 값을 입력하세요");
					}
				}
			}
		});
		//삭제
		del.setOnClickListener(new Button.OnClickListener() {
			public void onClick(View v) {
				if(R.id.del == v.getId()){
					mode=v.getId();
					Process();
					list.remove(p);
					Clear();
				}
			}
		});
		//아답터 생성 싱글초이스로 하나만 선택(반대는멀티초이스)
		adapter = new ArrayAdapter(this,
				android.R.layout.simple_list_item_single_choice, list);
		getListView().setChoiceMode(ListView.CHOICE_MODE_SINGLE);
	}

	//클릭되어지는
	public void onListItemClick(ListView parent, View v, int position, long id) {
		p = position;
		num.setText("선택된 번호 : " + p + " 번");
	}
	public void Clear(){
		//초기화
		name.setText("");
		korean.setText("");
		english.setText("");
		math.setText("");

		//출력
		setListAdapter(adapter);
	}
	public void Process(){
		//공통부분
		try {
			a1 = Integer.parseInt(korean.getText() + "");
			a2 = Integer.parseInt(english.getText() + "");
			a3 = Integer.parseInt(math.getText() + "");
			name2 = name.getText().toString();

			add1 = a1 + a2 + a3;
			avg = add1 / 3;
			add2 = Integer.toString(add1);
			avg2 = Integer.toString(avg);
		} catch (Exception e) {
			num.setText("예외 발생");
		} finally {
			Message();
		}
	}
	public void Message(){
		switch(mode){
		case R.id.add:
			Toast.makeText(this,p+" 번에 저장 되었습니다",4000).show();
			break;
		case R.id.mod:
			Toast.makeText(this,p+" 번이 수정 되었습니다",4000).show();
			break;
		case R.id.del:
			Toast.makeText(this,p+" 번이 삭제 되었습니다",4000).show();
			break;
		}
	}
}