Blackberry screen renew with new data - blackberry

Question

I am developing a Blackberry Application. I have a map in a screen. I want to refresh map's data with new data which i am getting from my web service. I am using BlockingSenderDestination in a Thread. When i request "get data" its return new data. no problem. I am using invokelater function to call my maprefresh function with passing arguments but i got illegalargumentexception.
Any suggestion to solve my problem or any better way to do this?
Here is my code:
public class MyMainScreen extends MainScreen {
RichMapField map;
MyClassList _myclassList;
private String _result2t;
public MyMainScreen(JSONArray jarray)
{
map = MapFactory.getInstance().generateRichMapField();
MapDataModel mapDataModel = map.getModel();
JSONObject json = null;
boolean getdata=false;
for (int i=0;i<jarray.length();i++)
{
try
{
json=jarray.getJSONObject(i);
getdata=true;
}
catch(Exception e)
{
}
if(getdata)
{
try
{
double lat = Double.valueOf(json.getString("LATITUDE")).doubleValue();
double lng = Double.valueOf(json.getString("LONGITUDE")).doubleValue();
String myclassdata= json.getString("myclassdata").toString();
MyClass ben = new MyClass(myclassdata);
_myclassList.addElement(ben);
MapLocation termimapitem = new MapLocation( lat, lng, "","");
mapDataModel.add((Mappable)termimapitem,"1");
}
catch(Exception e)
{
//mesajGoster("Hatalı Veri");
}
}
else
{
//mesajGoster("Listeye Eklenemedi");
}
}
}
private void GetTerminals(String companyNo){
final String companyNoR= companyNo;
Thread t = new Thread(new Runnable()
{
public void run()
{
Message response = null;
String uriStr = "http://webservice";
BlockingSenderDestination bsd = null;
try
{
bsd = (BlockingSenderDestination)
DestinationFactory.getSenderDestination
("o", URI.create(uriStr));
if(bsd == null)
{
bsd =
DestinationFactory.createBlockingSenderDestination
(new Context("o"),
URI.create(uriStr)
);
}
response = bsd.sendReceive();
if(response != null)
{
BSDResponse(response,companyNoR);
}
}
catch(Exception e)
{
}
finally
{
if(bsd != null)
{
bsd.release();
}
}
}
});
t.start();
}
private void BSDResponse(Message msg,final String companyNo)
{
if (msg instanceof ByteMessage)
{
ByteMessage reply = (ByteMessage) msg;
_result2t = (String) reply.getStringPayload();
} else if(msg instanceof StreamMessage)
{
StreamMessage reply = (StreamMessage) msg;
InputStream is = reply.getStreamPayload();
byte[] data = null;
try {
data = net.rim.device.api.io.IOUtilities.streamToBytes(is);
} catch (IOException e) {
// process the error
}
if(data != null)
{
_result2t = new String(data);
}
}
try {
final JSONArray jarray= new JSONArray(_result2t);
final String username=_userName;
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
Dialog.alert("The Toolbar i");
Yenile(jarray);
}
});
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
private void Yenile(JSONArray jarray){
MapDataModel mapDataModel = map.getModel();
mapDataModel.remove("1");
map.getMapField().update(true);
_terminalList = new TerminalList();
map= MapFactory.getInstance().generateRichMapField();
MapDataModel mapDataModel = map.getModel();
JSONObject json = null;
boolean getdata=false;
for (int i=0;i<jarray.length();i++)
{
try
{
json=jarray_terminaller.getJSONObject(i);
getdata=true;
}
catch(Exception e)
{
}
if(getdata)
{
try
{
double lat = Double.valueOf(json.getString("LATITUDE")).doubleValue();
double lng = Double.valueOf(json.getString("LONGITUDE")).doubleValue();
String myclassdata= json.getString("myclassdata").toString();
MyClass ben = new MyClass(myclassdata);
_myclassList.addElement(ben);
MapLocation termimapitem = new MapLocation( lat, lng, "","");
mapDataModel.add((Mappable)termimapitem,"1");
}
catch(Exception e)
{
//mesajGoster("Hatalı Veri");
}
}
else
{
//mesajGoster("Listeye Eklenemedi");
}
}
}
}

Answer 1

To refresh the screen: do like this:
public class LoadingScreen extends MainScreen{
LoadingScreen()
{
createGUI();
}
public void createGUI()
{
//Here you write the code that display on screen;
}}
we know that this is the actual way of creating a screen;
Now if you want to refresh the screen write like below:
deleteAll();
invalidate();
createGUI();//here it creates the screen with new data.
Instead of writing in InvokeLater method better to write the above three lines in run method after Thread.sleep(10000);
If you have any doubts come on stackOverFlow chat room name "Life for Blackberry" for clarify your and our doubts.

Answer 2

I found a solution to my question.
After getting the data i was sending it via new run method:
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
MyFunction(jarray);
}});
But i was need to synchronize with main thread. So the solution:
UiApplication.getUiApplication().invokeLater(new Runnable() {
public void run() {
synchronized(Application.getEventLock()) {
Yenile(jarray);
}
}
});