这个实例主要是对SDK中的Notepadv2Solution的修改和完善，因为本人在使用该sample发现一些错误和缺陷,主要是空指针异常。
（1）Notepadv1.java：

package com.google.android.demo.notepad1;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.view.Menu;
import android.view.View;
import android.view.Menu.Item;
import android.widget.ListView;
import android.widget.SimpleCursorAdapter;
public class Notepadv1 extends ListActivity {
 public static final int INSERT_ID = Menu.FIRST;
 private static final int EXIT_ID = 0;
 private static final int DELETE_ID = Menu.FIRST + 1;
 private static final int ACTIVITY_EDIT = 1;
 private static final int ACTIVITY_CREATE = 0;
 private NotesDbAdapter mDbHelper;
 private Cursor c;
   
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.notepad_list);
        mDbHelper = new NotesDbAdapter(this);
        mDbHelper.open();
        fillData();
    }
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
     boolean result = super.onCreateOptionsMenu(menu);
        menu.add(0, INSERT_ID, R.string.menu_insert);
        menu.add(0, EXIT_ID, R.string.exit_notes);
        menu.add(0, DELETE_ID, R.string.menu_delete);
        return result;
    }
    @Override
    public boolean onOptionsItemSelected(Item item) {
     switch (item.getId()) {
        case INSERT_ID:
            createNote();
            return true;
        case EXIT_ID:
         finish();
         return true;
        case DELETE_ID:
         mDbHelper.deleteNote(getListView().getSelectedItemId());
         fillData();
         return true;
        }
        return super.onOptionsItemSelected(item);
    }
   
    private void createNote() {
     Intent i = new Intent(this, NoteEdit.class);
        startSubActivity(i, ACTIVITY_CREATE);
    }
   
    private void fillData() {
        // Get all of the notes from the database and create the item list
        c = mDbHelper.fetchAllNotes();
        startManagingCursor(c);
        String[] from = new String[] { NotesDbAdapter.KEY_TITLE };
        int[] to = new int[] { R.id.text1 };
       
        // Now create an array adapter and set it to display using our row
        SimpleCursorAdapter notes =
            new SimpleCursorAdapter(this, R.layout.notes_row, c, from, to);
        setListAdapter(notes);
    }
   
    @Override
    protected void onListItemClick(ListView l, View v, int position, long id) {
     super.onListItemClick(l, v, position, id);
       
        c.moveTo(position);
        Intent i = new Intent(this, NoteEdit.class);
        i.putExtra(NotesDbAdapter.KEY_ROWID, id);
        i.putExtra(NotesDbAdapter.KEY_TITLE, c.getString(
                c.getColumnIndex(NotesDbAdapter.KEY_TITLE)));
        i.putExtra(NotesDbAdapter.KEY_BODY, c.getString(
                c.getColumnIndex(NotesDbAdapter.KEY_BODY)));
        startSubActivity(i, ACTIVITY_EDIT);
    }
   
    @Override
    protected void onActivityResult(int requestCode, int resultCode, String data, Bundle extras) {
        super.onActivityResult(requestCode, resultCode, data, extras);
       
        switch(requestCode) {
        case ACTIVITY_CREATE:
         if(extras == null)
          break;
         
            String title = extras.getString(NotesDbAdapter.KEY_TITLE);
            String body = extras.getString(NotesDbAdapter.KEY_BODY);
           
            mDbHelper.createNote(title, body);
            fillData();
          
            break;
        case ACTIVITY_EDIT:
         if(extras == null)
          break;
            Long rowId = extras.getLong(NotesDbAdapter.KEY_ROWID);
            if (rowId != null) {
                String editTitle = extras.getString(NotesDbAdapter.KEY_TITLE);
                String editBody = extras.getString(NotesDbAdapter.KEY_BODY);
                mDbHelper.updateNote(rowId, editTitle, editBody);
            }
            fillData();
            break;
        }
    }
}

说明：
此activity主要是将为创建notepad做前期工作的，此外还做收尾工作，将从后台接受过来的数据显示出来。
图示：


 
（2）NoteEdit.java:

package com.google.android.demo.notepad1;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
public class NoteEdit extends Activity {
 private EditText mTitleText;
    private EditText mBodyText;
    private Long mRowId;
    @Override
    protected void onCreate(Bundle icicle) {
        super.onCreate(icicle);
        setContentView(R.layout.note_edit);