Blackberry JAVA DEVELOPMENT ENVIRONMENT - - GPS AND MAPS - DEVELOPMENT GUIDE Manuale Utente Scaricare il pdf (Pagina 9)

Using GPS

Modes for getting GPS location information

To specify the location mode that a BlackBerry® device application uses to get location information, you can create

the

Criteria object and pass it as a parameter to LocationProvider.getInstance().

Specifying the source of GPS location information

A BlackBerry® Application selects the source of location information depending on how closely the GPS location

provider matches the defined criteria.

Modes for getting GPS location information

Specifying the source of GPS location information

Specifying a GPS receiver as the source for location information

Location

mode

Description

cell site Get location information from the location of cell site towers and strength of signal

Advantages

• the fastest location mode

Disadvantages

• accuracy of location information is low-level and does not provide tracking information such as speed or route information

Requirements

• both the BlackBerry device and the wireless service provider must support this mode

• wireless network coverage

assisted Get location information from satellites using a Position Determination Entity (PDE)

Advantages

• provides location information faster than the autonomous mode and more accurately than the cell site mode

Requirements

• both the BlackBerry device and the wireless service provider must support this functionality

• wireless network coverage

autonomous Get location information from the GPS receiver on the BlackBerry device without assistance from the wireless network

Advantages

• accuracy of location information is high-level

• does not require assistance from the wireless network

Disadvantages

• slower than other modes

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Blackberry JAVA DEVELOPMENT ENVIRONMENT - - GPS AND MAPS - DEVELOPMENT GUIDE Manuale Utente Pagina 9