Question

我正在尝试使用SimpleCursorTreeAdapter构建expandableList，但我的列表不会创建组，它会将每个子元素重复为组元素。

我的数据形成为KEY_ROWID，KEY_NAME，KEY_EMAIL，KEY_ILID，KEY_KURUMID，KEY_BOLGEID

我的数据：

(db,"Asli", "asli@gmail.com", 1, 1, 1); 
(db,"Osman Can", "osman@gmail.com", 1, 1, 1); 
(db,"Abuzer Kadayif", "kadayif@gmail.com", 1, 2, 1); 

(db,"Emre", "emre@gmail.com", 1, 3, 2); 
(db,"Deniz", "deniz@gmail.com", 1, 4, 2); 

(db,"Simon Garfunkel", "simon@gmail.com", 1, 5, 0); 
(db,"Eric Clapton", "eric@gmail.com", 1, 6, 0); 
(db,"Neil Young", "neil@gmail.com", 1, 5, 0);

这是我的代码：

String sqlString = "SELECT * " + " FROM " + Items.DATABASE_TABLE;

        Cursor mCursor = db.rawQuery(sqlString, null);

        SimpleCursorTreeAdapter mAdapter = new SimpleCursorTreeAdapter(this,
                mCursor, R.layout.row, R.layout.exprow,
                //createGroupList(), 
                new String[] { Items.KEY_BOLGEID },
                new int[] { R.id.txtItem },
                R.layout.exprow, R.layout.exprow,
                new String[] { Items.KEY_EMAIL,Items.KEY_NAME }, new int[] { R.id.dscItem, R.id.manuItem }) {

            @Override
            protected Cursor getChildrenCursor(Cursor groupCursor) {

                String tempGroup = groupCursor.getString(groupCursor
                        .getColumnIndex(Items.KEY_BOLGEID));

                DbHelper dbh = new DbHelper(BrowseActivity.this);
                SQLiteDatabase db = dbh.getWritableDatabase();

                String sqlString = "SELECT " + Items.KEY_ROWID + ", "
                        + Items.KEY_EMAIL + ", " + Items.KEY_NAME + ", "
                        + Items.KEY_KURUMID + ", " + Items.KEY_BOLGEID + ", "
                        + Items.KEY_ILID + " FROM " + Items.DATABASE_TABLE
                        + " WHERE " + Items.KEY_BOLGEID + "= "  + tempGroup 
                        ;
                Cursor mCursor = db.rawQuery(sqlString, null);

                return mCursor;

            }


        };

        browseView.setAdapter(mAdapter);

    }

我的结果应该是：

Group 1:
(db,"Asli", "asli@gmail.com", 1, 1, 1); 
(db,"Osman Can", "osman@gmail.com", 1, 1, 1); 
(db,"Abuzer Kadayif", "kadayif@gmail.com", 1, 2, 1); 
Group 2:        
(db,"Emre", "emre@gmail.com", 1, 3, 2); 
(db,"Deniz", "deniz@gmail.com", 1, 4, 2); 
Group 3:        
(db,"Simon Garfunkel", "simon@gmail.com", 1, 5, 0); 
(db,"Eric Clapton", "eric@gmail.com", 1, 6, 0); 
(db,"Neil Young", "neil@gmail.com", 1, 5, 0);

但确实如此第1组3次第2组2 3次组0

我试图改变groupCursor的sql，但它崩溃了。

Answer 1

您需要将第一个SQL语句更改为仅返回所需的组。现在你正在为每条记录获取它，所以适配器如果为每个记录提供一个组。将SQL更改为：

String sqlString = SELECT DISTINCT " + Items.KEY_BOLGEID + " AS _id FROM " + Items.DATABASE_TABLE;

这将为您提供您希望分组的每个项目的一个实例（并将其设置为_id列，这是适配器所必需的）。

然后在适配器调用的组部分中使用new String[] { _id }。

可扩展列表问题

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