Blackberry JAVA DEVELOPMENT ENVIRONMENT - - DEVICE APPLICATIONS INTEGRATION - DEVELOPMENT GUIDE Manuale Utente Scaricare il pdf (Pagina 16)

BlackBerry Mobile Data System 16

Feature Description

MIDP version 1.0 (JSR 37).

User interface The BlackBerry JDE provides two sets of APIs for creating application user interfaces (UI):

standard MIDP APIs and BlackBerry APIs. The BlackBerry UI APIs are a library of pre-built

user interface components, which provide default layout and behavior that is consistent

with core the BlackBerry programs.

• Screen components provide a standard screen layout, a default menu, and standard

behavior when the user presses the Escape button or clicks the trackwheel.

• Field components provide standard user interface elements for date selection, radio

buttons, check boxes, lists, text fields and labels, and gauge slider controls.

• Layout managers provide the ability to arrange components on a screen in standard

ways, such as horizontally, vertically, or in a left-to-right flow.

The BlackBerry UI APIs also provide flexibility for application developers to create custom

user interfaces with specialized layouts such as tables or grids and custom user interaction.

The BlackBerry Java implementation uses a standard Java event model to receive and

respond to specific types of events. For example, applications can receive and respond to

both user events, such as the user clicking the trackwheel or typing on the keyboard, and

system events, such as global alerts, real-time clock changes, and USB port connections.

Data storage The BlackBerry JDE provides two sets of APIs to store persistent data across BlackBerry

device resets: standard MIDP APIs and BlackBerry APIs. The BlackBerry Persistence APIs

enable applications to store entire objects in the file system and provide features to

optimize data grouping, searching, and performance and store structures such as hash

tables, ordered arrays, and trees, to provide faster searching.

Application developers can add the capability for users to back up and restore application

databases either wirelessly or through the BlackBerry Desktop Software.

System administrators can set an IT policy to determine whether applications can store data

in persistent storage.

Network

transport

Depending on the environment and the application requirements, BlackBerry devices can

connect to both corporate intranets and the Internet through various gateways, including

the BlackBerry Enterprise Server hosted by the enterprise or a gateway hosted by the

wireless service provider

BlackBerry devices are designed to support a wide range of network transport protocols

including:

• HTTP and HTTPS

• TCP, SSL, and TLS sockets

• email messages

• User Datagram Protocol (UDP) datagrams

• Short Message Service (SMS)

• Multimedia Messaging Service (MMS) is supported on some BlackBerry devices

Access to

system

resources

Custom applications can access system-wide resources on the BlackBerry device. For

example, applications can

• retrieve information on the state of the BlackBerry device radio and current signal level

• retrieve BlackBerry device information, such as the battery power level

• notify users when an event occurs by generating an audio tone or a vibration

The security features that this document describes might not be available when using network gateways that are hosted by the wireless

service provider.

Each type of network transport depends on the wireless service provider’s specific capabilities. Application developers must work closely

with wireless service providers to determine service availability.

www.blackberry.com

1 2 ... 11 12 13 14 15 16 17 18 19 20

Commenti su questo manuale

Nessun commento

Blackberry JAVA DEVELOPMENT ENVIRONMENT - - DEVICE APPLICATIONS INTEGRATION - DEVELOPMENT GUIDE Manuale Utente Pagina 16

Commenti su questo manuale

Prodotti e manuali riguardandi no Blackberry JAVA DEVELOPMENT ENVIRONMENT - - DEVICE APPLICATIONS INTEGRATION - DEVELOPMENT GUIDE