Unable to fill ListView with vector
I'm using a sample I got on the internet to create a listfield
that contains an image and the data contained in a vector.
Data are obtained from a JSON array that is created from a script php accessing a mysql database.
The problem is that the listfield poster not only any content, even if there are items in the table.
This is the code I use to get the JSON array data :
JSONArray items_array=job.getJSONArray("items");
for(int i=0;i
The code for the ListFieldCallback:
class MyListModel implements ListFieldCallback
{
private ListField _view;
private int _defaultRowHeight=32;
private int _defaultRowWidth=_defaultRowHeight;
private int _txtImagePadding=5;
private Bitmap _bitmap;
private Vector _data;
public MyListModel(ListField list,Vector data)
{
_view=new ListField();
_data=new Vector();
_data=MyScreen.data_vec;
_view=list;
list.setCallback(this);
// _view.setSize(_data.size());
_view.setRowHeight(_defaultRowHeight);
_bitmap=null;
//list.setSize(_data.size());
}
public void drawListRow(ListField list,Graphics g,int index,int y,int w)
{
Items itemToDraw=(Items)this.get(list,index);
String name=itemToDraw.getName();
g.drawText(name,_defaultRowWidth+_txtImagePadding,y,DrawStyle.LEADING|DrawStyle.ELLIPSIS,w-_defaultRowWidth-_txtImagePadding);
g.drawBitmap(0,y,_bitmap.getWidth(),_bitmap.getHeight(),_bitmap,0,0);
}
The code for the method of success which must now fill listview:
public void success(final Vector listboys)
{
UiApplication.getApplication().invokeLater(new Runnable()
{public void run()
{
data_vec=new Vector();
data_vec=listboys;
Items it1=(Items)data_vec.elementAt(0);
error("Vector Main Screen " +it1.getName());
final MyListField myListView=new MyListField();
final MyListModel myListModel=new MyListModel(myListView,data_vec);
myListView.addToContextMenu(myListModel.getAddMenuItem(0,0));
myListView.addToContextMenu(myListModel.getRemoveMenuItem(0,0));
myListView.addToContextMenu(myListModel.getModifyMenuItem(0,0));
myListView.addToContextMenu(myListModel.getEraseMenuItem(0,0));
{
Manager vfm=getMainManager();
vfm.add(myListView);
vfm.add(new SeparatorField(SeparatorField.LINE_HORIZONTAL));
setTitle("List Demo Title");
}
The listview is always empty. I don't see where data is passed to display. Whenever I call:
list.setSize(_data.size());
I always get a null pointer exception. How can I get the listview to display the data contained in the vector itemsholder. Thank you
using images in a listfield is not difficult, to improve that worked for you.
You can use drawBitmap to draw the image in the listfield.
Tags: BlackBerry Developers
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listItemComponents:]
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{StandardListItem}
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]
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Any help would be appreciated.
Thank you.
ListView determines ItemType of the element by calling the function itemType of the dataModel. By default, an ArrayDataModel returns an empty string for this call (see https://developer.blackberry.com/cascades/reference/bb__cascades__arraydatamodel.html).
This leaves you with a few options:
(1) If you have no header and all the elements are the same, you can make
ListItemComponent {
type: ""
...
(2) If you have headers or different elements, you can extend ArrayDataModel and implement your own function of itemType
(3) you can define a function of ItemType on your ListView in QML. Documentation:
ListView called DataModel::itemType() for each item in order to know the type. QML, this can be overridden by declaring the itemType function (data, row) on the ListView element. ListView then call this function instead of the function DataModel.
Here's how to create a list in QML which creates a header for all items on the high level and aStandardListItem for each item below the top level:
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Denes Kubicek
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