Populating ExpandableListView aus der Datenbank - funktioniert nicht

Question

Ich habe Tabellen Empfang und Protokolle und Tabelle Empfang has_many Protokolle. Also auf meiner LogsRecapitulation.class habe ich Gruppierungsprotokolle nach Sortier- und Bewertungsstufe (diese zwei Spalten stammen aus Tabellenprotokollen).

Ich habe versucht, dies über ExpandableListView zu machen. Jede Gruppe von übergeordneten Elementen besteht aus Sort und Grade für jede Gruppe aus der Datenbank.

Kinder Elemente werden textViews für Protokolle zählen in Kind Element, Masse, Preis und einige berechnete Preis haben. Und es sollte wie folgt aussehen:

ich geschaffen habe expandableListView Layouts und Adapter. Aber jetzt habe ich Probleme mit Eltern- und Kindelementen aus der Datenbank zu füllen.

Hier ist mein Code, damit Sie sehen können, was ich bisher gemacht habe.

Dies ist expandableListAadapter Klasse:

public class ExpandableListAdapter extends BaseExpandableListAdapter { 

    private Context _context; 
    private List<String> _listDataHeader; 
    private HashMap<String, List<String>> _listDataChild; 

    public ExpandableListAdapter(Context context, List<String> listDataHeader, HashMap<String, List<String>> listDataChild) { 
     this._context = context; 
     this._listDataHeader = listDataHeader; 
     this._listDataChild = listDataChild; 
    } 

    @Override 
    public Object getChild(int groupPosition, int childPosition) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)).get(childPosition); 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public View getChildView(int groupPosition, final int childPosition, boolean isLastChild, 
          View convertView, ViewGroup parent) { 
     final String childText = (String) getChild(groupPosition, childPosition); 

     if (convertView == null) { 
      LayoutInflater inflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.expendable_items, null); 
     } 

     TextView logsMass = (TextView) convertView.findViewById(R.id.exp_lis_mass); 
     TextView logsPrice = (TextView) convertView.findViewById(R.id.exp_lis_price); 
     TextView logsMassPrice = (TextView) convertView.findViewById(R.id.ext_lis_sum_price); 
     logsMass.setText(childText); 
     logsPrice.setText(childText); 
     logsMassPrice.setText(childText); 

     return convertView; 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return this._listDataChild.get(this._listDataHeader.get(groupPosition)).size(); 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return this._listDataHeader.get(groupPosition); 
    } 

    @Override 
    public int getGroupCount() { 
     return this._listDataHeader.size(); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
     String headerTitle = (String) getGroup(groupPosition); 
     if (convertView == null) { 
      LayoutInflater inflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); 
      convertView = inflater.inflate(R.layout.expandable_group, null); 
     } 

     TextView logsSort = (TextView) convertView.findViewById(R.id.exp_gr_sort); 
     TextView logsGrade = (TextView) convertView.findViewById(R.id.exp_gr_grade); 
     TextView logsCount = (TextView) convertView.findViewById(R.id.exp_gr_logs_count); 
     logsSort.setText(headerTitle); 
     logsGrade.setText(headerTitle); 
     logsCount.setText(headerTitle); 

     return convertView; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return false; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return true; 
    } 
} 

Und das ist meine logsRecapitulation Klasse:

public class LogsRecapitulation extends AppCompatActivity { 

    ExpandableListAdapter listAdapter; 
    ExpandableListView expListView; 
    List<String> listDataHeader; 
    HashMap<String, List<String>> listDataChild; 

    @Override 
    protected void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.expandable_layout); 
     //recieve RecepitID and query to group_by logs 
     final long forwardedId = (long) getIntent().getExtras().get(String.valueOf("recepitID")); 
     List<Logs> logsList = new Select().from(Logs.class).where("Receipt = " + forwardedId).groupBy("SortID, Grade").execute(); 
     //get the listview 
     expListView = (ExpandableListView) findViewById(R.id.lvExp); 
     prepareListData(); 
     listAdapter = new ExpandableListAdapter(this, listDataHeader, listDataChild); 
     expListView.setAdapter(listAdapter); 
    } 

    private void prepareListData() { 

    } 
} 

jetzt Mein Problem ist ExpendableListView mit Daten aus der Datenbank zu füllen. Hier sind meine Tabellenklassen:

//receipt table 
@Table(name = "Receipt") 
public class Receipt extends Model { 
    @Column(name="Place") 
    String place; 
    @Column(name="ShippingNumber") 
    String shippingNumber; 
    @Column(name="Warehouse") 
    String warehouse; 
    @Column(name="Carrier") 
    String carrier; 
    @Column(name="LicencePlate") 
    String licencePlate; 
    @Column(name = "Driver") 
    String driver; 
    @Column(name = "Customer") 
    String customer; 
    @Column(name= "DestWarehouse") 
    String destWarehouse; 
    @Column(name = "Employee") 
    String employee; 
    @Column(name = "PriceType") 
    String priceType; 
    @Column(name = "PriceCorrection") 
    Double priceCorrection; 
    @Column(name = "PriceCorrection2") 
    Double priceCorrection2; 
    @Column(name = "Supplier") 
    String supplier; 
    @Column(name = "CreatedAt") 
    Date createdAt; 
} 
//logs table 
@Table(name = "Logs") 
public class Logs extends Model { 
    @Column(name="PlateNumber") 
    String plate_number; 
    @Column(name="SortID") 
    String sort_id; 
    @Column(name="Grade") 
    String grade; 
    @Column(name = "Diametar") 
    double diameter; 
    @Column(name="Length") 
    double length; 
    @Column(name="CreatedAt") 
    Date createdAt; 
    @Column(name="Receipt") 
    Receipt receipt; 
    @Column(name = "Price") 
    Price price; 
} 
//price table 
@Table(name = "Price") 
public class Price extends Model { 
    @Column(name = "Sort") 
    String sort; 
    @Column(name = "Grade") 
    String grade; 
    @Column(name = "Diameter") 
    double diameter; 
    @Column(name = "LengthDG") 
    double lengthDG; 
    @Column(name = "LengthGG") 
    double lengthGG; 
    @Column(name = "StumpPriceKn") 
    double stumpPrice_kn; 
    @Column(name = "RoadPriceKn") 
    double roadPrice_kn; 
} 

Hinweis: Ich verwende ActiveAndroid.

Bitte, wenn jemand weiß, wie erweiterbare ListView von Datenbank zu füllen bitte helfen.

Frage: Was muss ich tun, um ExpandableListView erfolgreich aus der Datenbank zu füllen?

Answer 1

Ich bin kein Experte für ActiveAndroid. Aber hier sind die Schritte zum Erstellen einer erweiterbaren Listview mit Cursor.

Sie benötigen zwei Methoden in Ihrer db-helfer-Klasse, um die Zeilen zu sammeln, die Sie benötigen.

public Cursor fetchGroup() { 
    String query = "SELECT * FROM rooms" 
    return mDb.rawQuery(query, null); 
} 

public Cursor fetchChildren(String room) { 
    String query = "SELECT * FROM devices WHERE id_room = '" + room + "'"; 
    return mDb.rawQuery(query, null); 
} 

Dann müssen Sie den Adapter konfigurieren (in Ihrer Tätigkeit):

public class MyExpandableListAdapter extends SimpleCursorTreeAdapter { 
    public MyExpandableListAdapter(Cursor cursor, Context context,int groupLayout, 
     int childLayout, String[] groupFrom, int[] groupTo, String[] childrenFrom, 
     int[] childrenTo) { 
      super(context, cursor, groupLayout, groupFrom, groupTo, 
        childLayout, childrenFrom, childrenTo); 
     } 
    } 

    @Override 
    protected Cursor getChildrenCursor(Cursor groupCursor) { 
     Cursor childCursor = mDbHelper.fetchChildren(groupCursor.getString(groupCursor.getColumnIndex("id_room"));    
     getActivity().startManagingCursor(childCursor); 
     childCursor.moveToFirst(); 
     return childCursor; 
    } 
} 

Und schließlich, rufen Sie den Adapter und konfigurieren Sie es zu Ihrer Liste (in Ihrer Tätigkeit):

private void fillData() { 
    mGroupsCursor = mDbHelper.fetchGroup(); 
    getActivity().startManagingCursor(mGroupsCursor); 
    mGroupsCursor.moveToFirst(); 

    ExpandableListView elv = (ExpandableListView) getActivity().findViewById(android.R.id.list); 

    mAdapter = new MyExpandableListAdapter(mGroupsCursor, getActivity(), 
     R.layout.rowlayout_expgroup,      // Your row layout for a group 
     R.layout.rowlayout_itemlist_exp,     // Your row layout for a child 
     new String[] { "id_room" },      // Field(s) to use from group cursor 
     new int[] { android.R.id.room },     // Widget ids to put group data into 
     new String[] { "name_device", "state_device" }, // Field(s) to use from child cursors 
     new int[] { R.id.device, R.id.state });   // Widget ids to put child data into 

     lv.setAdapter(mAdapter);       // set the list adapter. 
    } 
} 

Also alles zusammen Code

public class List_Exp extends Activity { 
    @Override 
    public void onActivityCreated(Bundle savedInstanceState) { 
     super.onActivityCreated(savedInstanceState); 
     mDbHelper = new YourDB(getActivity()); 
     mDbHelper.open(); 
     fillData(); 
    } 

    private void fillData() { 
     // set list adapter here 
    } 

    public class MyExpandableListAdapter extends SimpleCursorTreeAdapter { 
     // Your adapter 
    } 
} 

Wenn Sie Click-Ereignis auf Gruppe aufnehmen möchten/Kind dann Ereignisse behandeln:

lv.setOnChildClickListener(new ExpandableListView.OnChildClickListener() { 
    @Override 
    public boolean onChildClick(ExpandableListView parent, View v, 
     int groupPosition, int childPosition, long id) { 
     // Your child click code here 
     return true; 
    } 
}); 

lv.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() { 
    @Override 
    public boolean onGroupClick(ExpandableListView parent, View v, 
     int groupPosition, int groupPosition, long id) { 
     // Your group click code here 
     return true; 
    } 
});