package com.example.myapplication.data; public class DataColumns { // 数据表通用主键 public static final String _ID = "_id"; // data 表独有列 public static final String MIME_TYPE = "mime_type"; public static final String NOTE_ID = "note_id"; public static final String CONTENT = "content"; public static final String DATA1 = "data1"; public static final String DATA2 = "data2"; public static final String DATA3 = "data3"; public static final String DATA4 = "data4"; public static final String DATA5 = "data5"; }