自定义内容提供者contentresolver

2019-11-09 18:26:20

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/** * 添加数据 */ public static boolean insert(ContentResolver resolver, Message msg) { ContentValues values = new ContentValues(); values.put("content", msg.getContent()); values.put("date", DateUtils.showDate()); resolver.insert(MyMessagePRovider.URI.CODE_MESSAGE_INSERT, values); return true; } /** * 删除数据 */ public static void delete(ContentResolver resolver, int id) { resolver.delete(MyMessageProvider.URI.CODE_MESSAGE_DELETE, "id = " + id, null); } /** * 删除全部数据 */ public static void deleteAll(ContentResolver resolver) { resolver.delete(MyMessageProvider.URI.CODE_MESSAGE_DELETE, null, null); } /** * 查询数据 * * @param resolver * @return */ public static List<Message> query(ContentResolver resolver) { List<Message> list = new ArrayList<>(); Cursor cursor = resolver.query(MyMessageProvider.URI.CODE_MESSAGE_QUERY, null, null, null, null); while (cursor.moveToNext()) { Message msg = new Message(); msg.setDate(cursor.getString(cursor.getColumnIndex("date"))); msg.setContent(cursor.getString(cursor.getColumnIndex("content"))); msg.setId(cursor.getInt(cursor.getColumnIndex("id"))); list.add(0, msg); } return list; }

数据库查询示例

[java] view plain copy

public static List<Message> query(ContentResolver resolver) { List<Message> list = new ArrayList<>(); Cursor cursor = resolver.query(MyDataProvider.URI.MESSAGE_CONTENT_URI, null, null, null, null); while (cursor.moveToNext()) { Message msg = new Message(); msg.setDate(cursor.getString(cursor.getColumnIndex("date"))); msg.setContent(cursor.getString(cursor.getColumnIndex("content"))); msg.setId(cursor.getInt(cursor.getColumnIndex("id"))); list.add(0, msg); } return list; }

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