自定义ListField与黑莓的复选框

Question

我试图实现与黑莓复选框的自定义ListField。我能够正确显示列表。我的要求是我需要使用黑莓中的复选框来选择一些多项目，但我无法更改支票并取消选中复选框。我试过navigationClick,CheckBox.setChangeListener,HorizontalFieldManager.setChangeListener方法，但我没有得到任何解决方案。有谁可以告诉我我做错了什么？

我的代码是：

public class InboxWithCheckboxes extends MainScreen{ 
    private InboxWithCheckboxeslistfield inboxWithCheckboxeslistfield; 
    public MenuItem _DeleteMessage; 
    private String[]templongDBTimeStamp; 
    private Database db; 
    private static final int[] GRADIENT_COLORS  = 
    { 
     Color.PALEVIOLETRED, Color.ANTIQUEWHITE, Color.DARKTURQUOISE, Color.DEEPSKYBLUE 
    }; 
    protected void makeMenu(Menu menu, int instance) 
    { 
     menu.add(_DeleteMessage); 

     //Create the default menu. 
     super.makeMenu(menu, instance); 
    } 
    public InboxWithCheckboxes(){ 
     inboxWithCheckboxeslistfield = new InboxWithCheckboxeslistfield(); 
     Background bg = BackgroundFactory.createLinearGradientBackground( 
       GRADIENT_COLORS[0], GRADIENT_COLORS[1], 
       GRADIENT_COLORS[2], GRADIENT_COLORS[3]); 
     this.getMainManager().setBackground(
       bg); 

     add(inboxWithCheckboxeslistfield);  
     add(new SeparatorField()); 
     db = new Database(); 

     _DeleteMessage = new MenuItem("DeleteMessage", 200, 10){ 
      public void run(){ 
       int index[] = inboxWithCheckboxeslistfield.getSelection(); 
       System.out.println("the list size is:"+inboxWithCheckboxeslistfield.getSize()); 
       for(int i=0;i<inboxWithCheckboxeslistfield.getSize();i++){ 
       int index1 = inboxWithCheckboxeslistfield.getSelectedIndex(); 
       System.out.println(" selected index is:"+index1); 

       inboxWithCheckboxeslistfield.delete(index1); 
       inboxWithCheckboxeslistfield.eraseAt(index1); 

       } 
       invalidate(); 

      } 
     }; 
    } 
} 


class InboxWithCheckboxeslistfield extends ListField implements ListFieldCallback { 
    public Vector rows; 
    private TableRowManager row ; 
    public TableRowManager rowManager; 
    private LabelField UserName,Message,Timestamp; 
    private HorizontalFieldManager hfmcheck; 

    private CheckboxField checkbox; 

    private Database db; 
    private Vector inboxdatavector; 
    private String[] msg,key,userinfo,timearray; 
    private long[] timeStamp; 
    /* Border For EditFields */ 
    Border bdr = BorderFactory.createRoundedBorder(new XYEdges(4, 4, 4, 4), 
      Border.STYLE_SOLID); 


    /** 
    * Creates a new MyScreen object 
    */ 
    public InboxWithCheckboxeslistfield() { 
     // TODO Auto-generated constructor stub 

     super(0, ListField.MULTI_SELECT); 
     setRowHeight(120); 
     setCallback(this); 
     rows = new Vector(); 
     db = new Database(); 
     inboxdatavector = db.fetchDataInbox(); 
     int count = db.getcountInbox(); 
     msg = new String[count]; 
     key = new String[count]; 
     userinfo = new String[count]; 
     timearray = new String[count]; 
     timeStamp = new long[count]; 
     for (int i = 0; i < count; i++) { 

      row = new TableRowManager() { 
       public void paint(Graphics g) { 
        g.setBackgroundColor(Color.BLACK); 
        g.fillRect(0, 0, getWidth(), getHeight()); 
        g.setColor(Color.BLACK); 
        g.clear(); 
        super.paint(g); 
       } 
      }; 
      try{ 
       byte[] a = (byte[]) inboxdatavector.elementAt(i); 
       ByteArrayInputStream bais = new ByteArrayInputStream(a); 
       DataInputStream dis = new DataInputStream(bais); 
       msg[i]= dis.readUTF(); 
       key[i] = dis.readUTF(); 
       userinfo[i] = dis.readUTF(); 
       timeStamp[i] = dis.readLong(); 
       timearray[i] = convertMillisecondsToDate(timeStamp[i]); 
       System.out.println("msg is "+msg[i]); 
       System.out.println("key is "+key[i]); 
       System.out.println("userinfo is "+userinfo[i]); 
       System.out.println("timeStamp is "+timeStamp[i]); 

       bais.close(); 
       dis.close(); 
      } catch (Exception e) { 
       e.printStackTrace(); 
      } 



      UserName = new LabelField("" + String.valueOf(i), 
        DrawStyle.ELLIPSIS | LabelField.USE_ALL_WIDTH 
        | DrawStyle.LEFT); 
      UserName.setText(userinfo[i]); 
      row.add(UserName); 
      hfmcheck = new HorizontalFieldManager(HorizontalFieldManager.FIELD_HCENTER); 
      row.add(hfmcheck); 
      checkbox = new CheckboxField("",false,Field.USE_ALL_WIDTH){ 
       public void paint(Graphics graphics) { 
        graphics.setColor(Color.WHITE); 
        super.paint(graphics); 
       } 
      }; 
      hfmcheck.add(checkbox); 
      hfmcheck.setChangeListener(new FieldChangeListener() { 

       public void fieldChanged(Field field, int context) { 
        // TODO Auto-generated method stub 
        System.out.println("entered into hfmfield"); 
        checkbox.setChecked(true); 
       } 
      }); 
      Message = new LabelField("" + String.valueOf(i), 
        DrawStyle.ELLIPSIS | LabelField.USE_ALL_WIDTH 
        | DrawStyle.RIGHT); 
      Message.setText(msg[i]); 
      row.add(Message); 


      Timestamp = new LabelField("" + String.valueOf(i), 
        DrawStyle.ELLIPSIS | LabelField.USE_ALL_WIDTH 
        | DrawStyle.RIGHT); 
      Timestamp.setText(timearray[i]); 
      row.add(Timestamp); 

      rows.addElement(row); 

     } 
     for (int i = 0; i < userinfo.length; i++) { 
      timearray[i] = convertMillisecondsToDate(timeStamp[i]); 
      System.out.println("the time is:"+timearray[i]); 

     } 
     /*checkbox.setChangeListener(new FieldChangeListener() { 

      public void fieldChanged(Field field, int context) { 
       // TODO Auto-generated method stub 
       System.out.println("enter into checked changed."); 
       checkbox.setChecked(true); 

      } 
     });*/ 
     setSize(rows.size()); 


    } 

    public void drawListRow(ListField listField, Graphics graphics, int index, 
      int y, int width) { 
     // TODO Auto-generated method stub 

     InboxWithCheckboxeslistfield list = (InboxWithCheckboxeslistfield) listField; 
     rowManager = (TableRowManager) list.rows.elementAt(index); 
     ((TableRowManager) rowManager).drawRow(graphics, 0, y, width, list.getRowHeight()); 



    } 
    public void erase() { 
     rows.removeAllElements(); 
    } 

    public void eraseAt(int index) { 
     rows.removeElementAt(index); 

    } 
    private class TableRowManager extends Manager { 

     protected TableRowManager(){ 
      super(0); 
     } 

     public void drawRow(Graphics graphics, int i, int y, int width, 
       int rowHeight) { 
      // TODO Auto-generated method stub 
      // Arrange the cell fields within this row manager. 
      layout(width, rowHeight); 

      // Place this row manager within its enclosing list. 
      setPosition(i, y); 

      // Apply a translating/clipping transformation to the graphics 
      // context so that this row paints in the right area. 
      graphics.pushRegion(getExtent()); 

      // Paint this manager's controlled fields. 
      subpaint(graphics); 
      graphics.setColor(0x00CACACA); 
      graphics.drawLine(0, 0, getPreferredWidth(), 0); 

      // Restore the graphics context. 
      graphics.popContext(); 

     } 


     protected void sublayout(int width, int height) { 
      // TODO Auto-generated method stub 
      // set the size and position of each field. 
      int fontHeight = Font.getDefault().getHeight(); 
      int preferredWidth = getPreferredWidth(); 

      Field field = getField(0); 

      layoutChild(field, preferredWidth, 50); 
      setPositionChild(field, 10, 5); 

      field = getField(1); 
      layoutChild(field, preferredWidth, 150); 
      setPositionChild(field, 10,40); 


      // set the list name label field 
      field = getField(2); 
      layoutChild(field, 300, fontHeight + 1); 
      //setPositionChild(field, 1, 2); 
      setPositionChild(field, 80, fontHeight); 

      // set the due time name label field 
      field = getField(3); 
      layoutChild(field, 150, fontHeight + 1); 
      setPositionChild(field, 500, fontHeight); 



      setExtent(getPreferredWidth(), getPreferredHeight()); 

     } 
     // The preferred width of a row is defined by the list renderer. 
     public int getPreferredWidth() 
     {  

      return Display.getWidth();   
     } 
     // The preferred height of a row is the "row height" as defined in the 
     // enclosing list.  
     public int getPreferredHeight()  
     { 
      return getRowHeight();  
     } 


    } 
    public Object get(ListField listField, int index) { 
     return null; 
    } 

    public int getPreferredWidth(ListField listField) { 
     return 0; 
    } 

    public int indexOfList(ListField listField, String prefix, int start) { 
     return 0; 
    } 


    public String convertMillisecondsToDate(long timeStamp) { 

     // Create a DateFormatter object for displaying date information. 

     SimpleDateFormat formatter = new SimpleDateFormat("dd/MM/yyyy hh:mm:ss"); 

     java.util.Date date = new java.util.Date(timeStamp); 
     System.out.println("the date is:"+formatter.formatLocal(date.getTime())); 
     return formatter.formatLocal(date.getTime()); 
    } 
    protected boolean navigationClick(int status, int time) { 
     /*_DeleteMessage = new MenuItem("DeleteMessage", 200, 10){ 
      public void run(){ 
       System.out.println("entered into delete item"); 
       int index = getSelectedIndex(); 
       System.out.println(" selected index is:"+index); 
       for(int i=0;i<rows.size();i++){ 
        rows.removeElementAt(index); 
        invalidate(); 
       } 
      } 

     };*/ 
     return true; 

    } 


} 

Answer 1

试试这个 -

CheckboxField box; 
Vector box1 = new Vector(); 
boolean checked = false; 

for(int i=0;i<fbFrndsVector.size();i++){ 
    //your object class and vector.  
    FriendsRequestObject co_vec = (FriendsRequestObject)fbFrndsVector.elementAt(i); 

    String name=co_vec.getSender_name(); 
    String id=co_vec.getSender_id(); 

    box = new CheckboxField(" "+name , checked, Field.USE_ALL_WIDTH){ 
     public void paint(Graphics graphics) { 
       graphics.setColor(Color.WHITE); 
       super.paint(graphics); 
      } 
     }; 

     box1.addElement(box); 
     box.setMargin(8, 0, 0, 5); 
     vfm.add(box); 


} 

add(vfm); 

//您按一下按钮，下面写的代码 -

Vector selected_frnd=new Vector(); 
    private Vector _selected_frnds; 


     for(int d=0; d<box1.size(); d++){ 
       CheckboxField box=(CheckboxField)box1.elementAt(d); 
        if(box.getChecked()==true){ 
        FriendsRequestObject co_vec = (FriendsRequestObject)fbFrndsVector.elementAt(d); 

        String name_ = co_vec.getSender_name(); 
        String id_ = co_vec.getSender_id(); 
        FriendsRequestObject sfrnds = new FriendsRequestObject(id_, name_); 
        selected_frnd.addElement(sfrnds); 


        } 
       } 

矢量selected_frnd将包含所有选定的项目。