public void onCreate(Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);

        setContentView(R.layout.list);

        mDbHelper = new DiaryDbAdapter(this);

        mDbHelper.open();

        renderListView();

        ListView mylistView = getListView();

        mylistView.setOnCreateContextMenuListener(new OnCreateContextMenuListener() {

            @Override

            public void onCreateContextMenu(ContextMenu menu, View v,

                    ContextMenuInfo menuInfo) {

                menu.setHeaderTitle("选择操作");

                menu.add(0, 0, 0, "更新该条");

                menu.add(0, 1, 0, "删除该条");

            }

        });

    }
    

<ListView android:id="@+id/android:list"

        android:layout_width="wrap_content"

        android:layout_height="wrap_content" />