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POblackberry lazyloading in clumsy layout
 

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    <p>I am using a customlistfield by extending VerticalFieldManager, and for the row I am usingf another CustoRowManager that extends Manager. The CustomRowManager has 2 TextField and a BitmapField . This list is implemented for a live xml feed. For loading the bitmapfield I am displaying placeholders which is then replaced by the actual image from background thread. I am not able to figure out how I should replace place holders with the bitmapfield. using invalidate() is one option, but on which element I should perform it.</p> <pre><code>public class CustomList extends VerticalFieldManager{ private int totalHeight = 0; private int screenHeight = 0; private int scrollPosition = 0; protected void sublayout(int width, int height) { width = 480; height = 230; super.sublayout(width,height); setExtent(width, height); } protected boolean navigationClick(int status, int time) { int index; System.out.println("CLICKED!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"); if ((status &amp; KeypadListener.STATUS_FOUR_WAY) == KeypadListener.STATUS_FOUR_WAY) { index = this.getFieldWithFocusIndex(); UiApplication.getUiApplication().pushScreen(new TopNewsScreen(_vec, index)); } return true; } Bitmap _bmp = null; BitmapField _bmF = null; Object _Obj = null; TopNews _topNews = null; String _headStr = null, _metaStr = null; CustTextField _headNews = null, _metaData = null; CustomRow _custRow = null; Vector _vec; public CustomList(Vector _vec,long _property) { super(_property); this._vec = new Vector(); this._vec = _vec; int _size = _vec.size(); int i ; for(i = 0; i &lt;_size; i++) { _headStr = new String(); _metaStr = new String(); _bmp = Bitmap.getBitmapResource("img/1.jpg"); _bmF = new BitmapField(_bmp); _topNews = (TopNews)_vec.elementAt(i); _headStr = _topNews.getHeadline(); _metaStr = _topNews.getMetaData(); int _newsLeng = _headStr.length(), alert = 0; if(_newsLeng &lt;= 35) { alert = 0; }else if(_newsLeng&gt;35&amp;&amp;_newsLeng&lt;=70) { alert = 1; }else { alert = 2; _headStr = this.truncate(_headStr,70); } _custRow = new CustomRow(alert); _headNews = new CustTextField(_headStr,25,0x05235b,TextField.NON_FOCUSABLE); _metaData = new CustTextField(_metaStr,15,0x666666,TextField.NON_FOCUSABLE); _custRow.add(_headNews); _custRow.add(_metaData); _custRow.add(_bmF); super.add(_custRow); } } String truncate(String value, int length) { if (value != null &amp;&amp; value.length() &gt; length) value = value.substring(0, length); return value; } } class CustomRow extends Manager implements FocusChangeListener{ private int _headLeng; private NullField _focus = null; CustomRow(int _headLeng) { super(Manager.FOCUSABLE| Manager.NO_HORIZONTAL_SCROLL |Manager.NO_VERTICAL_SCROLL); this._headLeng = _headLeng; _focus = new NullField(NullField.FOCUSABLE); _focus.setFocusListener(CustomRow.this); this.add(_focus); } protected void sublayout(int width, int height) { if(_headLeng==0) { layoutChild(getField(0),0,0); setPositionChild(getField(0),0 , 0); layoutChild(getField(1),360,20); setPositionChild(getField(1),10 , 10); layoutChild(getField(2),300, 20); setPositionChild(getField(2), 10, 65); layoutChild(getField(3),90,65); setPositionChild(getField(3), 380, 10); }else { /* layoutChild(getField(0),0,0); setPositionChild(getField(0),0 , 0); layoutChild(getField(1),360,20); setPositionChild(getField(1),10 , 10); layoutChild(getField(2),300, 20); setPositionChild(getField(2), 10, 50); layoutChild(getField(3),90,65); setPositionChild(getField(3), 380, 10); */ layoutChild(getField(0),0,0); setPositionChild(getField(0),0 , 0); layoutChild(getField(1),360,20); setPositionChild(getField(1),10 , 10); layoutChild(getField(2),300, 20); setPositionChild(getField(2), 10, 65); layoutChild(getField(3),90,65); setPositionChild(getField(3), 380, 10); } height = 80; width = 480; setExtent(width, height); } protected void paint(Graphics graphics) { graphics.setColor(Color.GRAY); graphics.drawLine(10, 79, Display.getWidth()-10, 79); super.paint(graphics); } public void focusChanged(Field field, int eventType) { // TODO Auto-generated method stub this.getManager().invalidate(); } protected void paintBackground(Graphics g) { int prevBg = g.getBackgroundColor(); if (_focus.isFocus()) { g.setBackgroundColor(Color.LIGHTBLUE); } else { g.setBackgroundColor(Color.WHITE); } g.clear(); g.setBackgroundColor(prevBg); } } </code></pre>
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    1. This table or related slice is empty.
 

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