如何通过游标android

Question

我想通过单击recyclerview项目从sqlite db返回链接。 它始终返回最后添加的内容。问题在于光标，但我不知道，如何修复它。

DBManager.class中的游标查询

  public Cursor linkColumn() {
    String[] linkColumn = new String[]{DatabaseHelper.LINK};
    Cursor cursor = sqLiteDatabase
            .query(
                    DatabaseHelper.TABLE_NAME,
                    linkColumn,
                    null,
                    null,
                    null,
                    null,
                    null);
    return cursor;
}

点击商品

 @Override
        public void onItemClick(long _id) {
            Intent returnIntent = new Intent();
            Cursor cursor = dbManager.linkColumn();

            String item = cursor.getString(cursor.getColumnIndex(DatabaseHelper.LINK));
            returnIntent.putExtra("link", item);
            setResult(RESULT_OK, returnIntent);
            finish();

        }

Answer 1

DBManager.class中的游标查询

 public Cursor linkColumn(long _id) {
    String[] itemById = new String[]{DatabaseHelper.LINK};
    Cursor cursor = sqLiteDatabase
            .query(
                    DatabaseHelper.TABLE_NAME,
                    itemById,
                    DatabaseHelper.ID + "=" + _id,
                    null,
                    null,
                    null,
                    null);
    if (cursor != null) {
        cursor.moveToFirst();
    }
    return cursor;
}

点击商品

 @Override
     public void onItemClick(long _id) {
     Intent returnIntent = new Intent();
     Cursor cursor = dbManager.linkColumn(_id);
     if(cursor.getCount()!=0){
     String item = cursor.getString(cursor.getColumnIndex(DatabaseHelper.LINK));
     returnIntent.putExtra("link", item);
     setResult(RESULT_OK, returnIntent);
     finish();}
     cursor.close();
  }