Blackberry GPS and BlackBerry Maps Manual - Página 27

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Development Guide

To convert pixels to latitudinal and longitudinal coordinates, invoke

convertFieldToWorld(XYPoint fieldIn, Coordinates worldOut) or

convertFieldToWorld(XYPoint fieldIn, XYPoint worldOut).

Configure the display size of a MapField

A BlackBerry® device application can control the display size of a MapField to make other UI components visible on the

screen of a BlackBerry device.

If you configure the preferred size of MapField, you override the dimension values passed in layout(). The height and

width values are in pixels.

Invoke setPreferredSize(int preferredWidth, int preferredHeight).

Requesting location information for an address

You can use the Locator class in a BlackBerry® device application to request location information for an address. Requests

are sent to a locator server for location-based services. If the request is successful, the server returns an enumeration that contains

latitudinal and longitudinal data for the address. If the request is unsuccessful, the server throws aLocatorException

exception that contains the reason for the unsuccessful request. A BlackBerry device application can request location information

for only one address at a time.

Retrieve location information for an address stored in address fields

Create an AddressInfo object.

AddressInfo ai = new AddressInfo();

Set the fields of the AddressInfo object.

ai.setField(AddressInfo.STREET, "main street");

ai.setField(AddressInfo.CITY, "Toronto");

ai.setField(AddressInfo.STATE, "Ontario");

ai.setField(AddressInfo.POSTAL_CODE, "XXX XXX");

ai.setField(AddressInfo.COUNTRY, "Canada");

Create a Coordinates object that the location-based services locator server uses as a starting location to search for

location information for an address.

Coordinates co = new Coordinates(45.423488, -75.697929, 0);

Create a Locator object.

Locator lo = new Locator();

Invoke Locator.geocode(AddressInfo address, Coordinates startCoords).

Enumeration en = lo.geocode(ai, co);

Requesting location information for an address