Java Development

[kiran_b]

Hi,

     In my application i want to invoke maps , for that i am using mapview and everything is fine.but sadly i heard that blackberry maps supports only some countries..

    in my app i want to show counties like India,Afganisthan etc.. those are not supported by blackberry maps..

so please any one suggest me how can i get these countires also if i select it in my application.it's very urgent for me pls give me reply ASAP..

     i am using jde 4.7 for my application...

[sheeluwiki]

May be try using google maps

[kiran_b]

Hi,

  While googling i understand that google maps is only my solution..

but i dont know how to start it, will you please give me a snippet for how to invoke google map in application through code..

or atleast tell me the steps for accessing google maps...

i am waiting for reply....

[sheeluwiki · Accepted solution]

Here is the sample code snippet which works fine for me.

Using this code you can display single location on the map.

class GoogleSingleLocation_Scr extends MainScreen {
 public GoogleSingleLocation_Scr() {    
 }    
 protected void makeMenu(Menu menu, int instance) {
  super.makeMenu(menu, instance);
  menu.add(mInvokeGMaps);
 }    
 MenuItem mInvokeGMaps = new MenuItem("Run GMaps", 0, 0) {
  public void run() {
   GMLocation location 
    = new GMLocation(51.507778, -0.128056, "London");
   invokeGMaps(location);
  };
 };    
 public void invokeGMaps(GMLocation l) {
  int mh = CodeModuleManager.getModuleHandle("GoogleMaps");
  if (mh == 0) {
   try {
    throw new ApplicationManagerException(
      "GoogleMaps isn't installed");
   } catch (ApplicationManagerException e) {
    System.out.println(e.getMessage());
   }
  }
  URLEncodedPostData uepd = new URLEncodedPostData(null, false);
  uepd.append("action", "LOCN");
  uepd.append("a", "@latlon:" + l.getLatitude() 
   + "," + l.getLongitude());
  uepd.append("title", l.getName());
  uepd.append("description", l.getDescription());
  String[] args = { "http://gmm/x?" + uepd.toString() };
  ApplicationDescriptor ad = CodeModuleManager
    .getApplicationDescriptors(mh)[0];
  ApplicationDescriptor ad2 = new ApplicationDescriptor(ad, args);
  try {
   ApplicationManager.getApplicationManager()
     .runApplication(ad2, true);
  } catch (ApplicationManagerException e) {
   System.out.println(e.getMessage());
  }
 }
}

Suppose if you need to display multiple location on google maps then you need to prepare a KML file and make it available on public server which google map can access

Some URL links which might be useful for you.

http://code.google.com/intl/en/apis/maps/documentation/mapsdata/developers_guide_java.html#Audience

http://stackoverflow.com/questions/3301378/google-maps-apidynamic-plot-multiple-locations-via-url-sh...

[kiran_b]

Hi,

     Tnaks for reply, where can i get jar file accessing  
GMLocation class will you please give me the link for this..

appreciate your help....

[sheeluwiki]

Here is the code for GMLocation

class GMLocation {    
	 String mName;
	 String mDescription;
	 double mLatitude;
	 double mLongitude;
	 public GMLocation(double lat, double lon) {
	  mLatitude = lat;
	  mLongitude = lon;
	 }    
	 public GMLocation(double d, double e, String name) {
	  this(d, e);
	  mName = name;
	 }    
	 public GMLocation(double lat, double lon, String name, String descr) {
	  this(lat, lon, name);
	  mDescription = descr;
	 }    
	 public String getName() {
	  return mName;
	 }    
	 public String getDescription() {
	  return mDescription;
	 }    
	 public String getLongitude() {
	  return String.valueOf(mLongitude);
	 }    
	 public String getLatitude() {
	  return String.valueOf(mLatitude);
	 }
	}

You do not need any other external jar files to access google maps in BB.

[kiran_b]

Hi,

    I am getting null pointer exception when i select  'Run Gmaps 'menu item and nothing is displayed...

while debugging i found that in below line i am getting null pointer acception

  ApplicationDescriptor ad = CodeModuleManager
    .getApplicationDescriptors(mh)[0];

help needed

[sheeluwiki]

Have you installed Google Maps application in your device / Simulator?

If you have not installed it yet, install it and try again.

http://www.google.com/mobile/maps/

[kiran_b]

Hi,

   I haven't install google maps on Blackberry , i tried but not succeed ..

let me clarify is there any chance to install google maps programatically ???

why because if i release my application to client ,how can we know whether he installed google maps or not...

if he is not installed then application doesnt work thats why i am asking above question

[sheeluwiki]

Try the below URL in you device or simulator and download the google map.

m.google.com/maps

What is the problem you are getting in downloading the map into the device?