일단 소스코드는 이렇구요.. (커니님의 강좌 소스를 사용하고 있습니다.)

public class HelpDB extends Activity {
 
 public static final String KEY_NAME = "name";
 public static final String KEY_PHONE = "phone";
 public static final String KEY_ROWID = "_id";

 public static final int FIND_BY_NAME = 0;
 public static final int FIND_BY_PHONE = 1;

 private static final String TAG = "DbAdapter";
 private DatabaseHelper mDbHelper;
 private SQLiteDatabase mDb;

 private static final String DATABASE_CREATE =
  "create table data (_id integer primary key autoincrement,"+
  "name text not null, phone text not null);";
  
 private static final String DATABASE_NAME = "data.db";
 private static final String DATABASE_TABLE = "data";
 private static final int DATABASE_VERSION = 1;
  
 private Context mCtx;
 
  public void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.main);
         //mCtx = new HelpDB(mCtx);
         //mDbHelper = new DatabaseHelper(mCtx);
         open();
         mDbHelper.onCreate(mDb);
         //mDbHelper.onCreate(mDb);
         //mDb = openOrCreateDatabase(DATABASE_NAME, SQLiteDatabase.CREATE_IF_NECESSARY, null);
         //mDb.execSQL("CREATE TABLE IF NOT EXISTS fruits" + "(id integer primary key autoincrement, name varcahr(30));");
         //mDb.execSQL("insert into fruit(name) values('grape')");
         //mDb.execSQL("insert into fruit(name) values('apple')");
        
         final Button protectorNumber = (Button)findViewById(R.id.protectorNumber);
         final Button positionTransfer = (Button)findViewById(R.id.positionTransfer);
      
     }
 
  public class DatabaseHelper extends SQLiteOpenHelper{

   public DatabaseHelper(Context context) {       
    super(context, DATABASE_NAME, null, DATABASE_VERSION);
   }
    
   public void onCreate(SQLiteDatabase db){     
    db.execSQL(DATABASE_CREATE); 
   }
     
   public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion){            
    Log.w(TAG, "Upgrading db from version" + oldVersion + " to" +               
    newVersion + ", which will destroy all old data");     
    db.execSQL("DROP TABLE IF EXISTS data");        
    onCreate(db);     
   }
  }

   public HelpDB(Context ctx){
    this.mCtx = ctx;
   }

   public HelpDB open() throws SQLException{
    mDbHelper = new DatabaseHelper(mCtx);    
    mDb = mDbHelper.getWritableDatabase();   
    return this;
   }

   public void close(){
    mDbHelper.close();
   }
}

문제는 onCreate메소드에서 DatabaseHelper클래스의 메소드들을 불러와서 디비를 열려고 하는데.. 호출만 했다하면 에러가 나네요;;
그리고, open()메소드등을 불러와도 계속 에러가 뜹니다;;ㅠ.ㅜ