SQLite的小例子--备忘录(11)

    @Override 
    protected void onCreate(Bundle bundle) { 
        super.onCreate(bundle); 
        mDbHelper = new MyAdapter(this); 
        mDbHelper.open(); 
        setContentView(R.layout.test_edit); 
        mCategory = (Spinner) findViewById(R.id.category); 
        mTitleText = (EditText) findViewById(R.id.todo_edit_summary); 
        mBodyText = (EditText) findViewById(R.id.todo_edit_description); 
 
        Button confirmButton = (Button) findViewById(R.id.todo_edit_button); 
        mRowId = null; 
        Bundle extras = getIntent().getExtras(); 
        mRowId = (bundle == null) ? null : (Long) bundle 
                .getSerializable(MyAdapter.KEY_ROWID); 
        if (extras != null) { 
            mRowId = extras.getLong(MyAdapter.KEY_ROWID); 
        } 
        populateFields(); 
        confirmButton.setOnClickListener(new View.OnClickListener() { 
            public void onClick(View view) { 
                setResult(RESULT_OK); 
                finish(); 
            } 
 
        }); 
    } 
 
    private void populateFields() { 
        if (mRowId != null) { 
            Cursor todo = mDbHelper.fetchTest(mRowId); 
            startManagingCursor(todo); 
            String category = todo.getString(todo 
                    .getColumnIndexOrThrow(MyAdapter.KEY_CATEGORY));