Download Java API for Mobile Development

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UNDERSTANDING JAVA APIS
FOR MOBILE DEVICES
2
Understanding Java APIs for mobile
devices
• Objectives
• What are Java APIs?
• List and describe the various APIs
• Explain the features of the various APIs
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What are Java APIs?
Java APIs
• An API is an exposed area of interaction between a library of
services and the program that consumes those services.
• An API usually defines the following items:
• Code vocabulary
• Naming conventions
• Function and subroutine syntax
• Public and private objects
• Data structures
4
What are Java APIs?
Java APIs
• APIs can be language dependent or language agnostic.
• Language dependent APIs provide APIs that serve as frameworks
to expand the abilities and services of a particular programming
language. Language agnostic APIs define services that can be
made available to programming languages.
• The Java APIs used for application development for the
BlackBerry® smartphone are language dependent APIs. They
provide frameworks built in the Java language for use by other
Java-based applications.
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What are Java APIs?
• Java ME
• The main development platform for the BlackBerry is Java® ME.
Java ME is an industry standard set of Java APIs that defines
services for various embedded and mobile devices. Applications
developed using Java ME run in the BlackBerry® Java® Virtual
Machine; a custom version of the main Java Virtual Machine
optimized for the BlackBerry environment.
• As with other implementations of the JVM, the BlackBerry® Java®
Virtual Machine provides all application runtime services and
performs such functions as memory allocations, security checks,
and garbage collection.
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What are Java APIs?
Java ME
• The MIDP v2.0 standard is part of Java ME and is fully supported
by most BlackBerry smartphones as defined in JSR 118
• The MIDP v2.0 standard provides a core set of Java APIs a
BlackBerry smartphone supports regardless of the underlying
operating system.
• You can develop applications in Java ME according to the MIDP
v2.0 standard once and run them on a device that is MIDP v2.0
compliant.
• BlackBerry smartphones running Software version 4.0 or earlier are
not MIDP v2.0 compliant. These devices are MIDP 1.0 compliant.
MIDP Mobile Information Device Profile
JSR Java Specification Request
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What are Java APIs?
Supported Java APIs
• The BlackBerry smartphone supports the MIDP standard and the
approximately 85 different APIs that are part of the standard. This
core set of functionality provides the majority of the APIs required
for the BlackBerry smartphone.
• In addition to this core functionality, BlackBerry development also
supports the following APIs as defined in the noted JSRs.
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What are Java APIs?
Supported Java APIs
• JSR 30 CLDC version 1.0
• The CLDC defines the base APIs and virtual machine for
devices such as mobile phones, pagers, and personal digital
assistants. The CLDC, coupled with the MIDP, provides the
Java services available for application development.
• CLDC version 1.0 is an earlier version supported by older
devices. CDLC version 1.0 is supported by devices running
BlackBerry® Device Software Version 4.0 or earlier.
CLDC Connected Limited Device Configuration
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What are Java APIs?
Supported Java APIs
• JSR 37
MIDP version 1.0
• The MIDP, coupled with the CLDC, provides the core set of
Java APIs a BlackBerry smartphone supports regardless of
the underlying operating system.
• MIDP version 1.0 is an earlier version supported by older
devices. MIDP version 1.0 is supported by devices running
BlackBerry Device Software version 4.0 or earlier.
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What are Java APIs?
Supported Java APIs
• JSR 75 PDA Optional Packages
• The PDA Optional Packages API provides services for
accessing PIM data and file systems. This API is only
available for devices running BlackBerry Device Software
version 4.2 or later.
• JSR 82 Java APIs for Bluetooth®
• The Java APIs for Bluetooth provides services for the use of
Bluetooth devices with Java applications. These services
allow applications to integrate with Bluetooth devices, such as
headsets, and make use of their functionality.
PIM Personal Information Management
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What are Java APIs?
Supported Java APIs
• JSR 120 WMA version 1.1
• The Wireless Messaging API version 1.1 defines a set of
standardized services for wireless communication resources
designed to run on Java ME configurations.
• JSR 135 MM API version 1.1
• The MM API defines services that allow easy access and
control of basic audio and multimedia resources. It also
addresses scalability and support of more sophisticated
features.
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What are Java APIs?
Supported Java APIs
• JSR 139 CLDC version 1.1
• The CLDC defines the base APIs and virtual machine for
devices such as mobile phones, pagers, and PDAs. The
CLDC, coupled with the MIDP, provides the Java services
available for application development.
• This API is an update to CLDC version 1.0 specified in JSR
30.
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What are Java APIs?
Supported Java APIs
• JSR 172 Java Platform, ME Web Services
• The Java Platform, ME Web Services API defines services for
accessing web services using Java ME.
• JSR 177 SATSA for Java Platform, ME
• The SATSA defines services for security and trust services.
• JSR 179 Location API for Java ME
• The Location API defines services for building location-based
applications.
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What are Java APIs?
Supported Java APIs
• JSR 185 JTWI
• The JTWI API defines an overall architectural description to
coordinate JCP efforts with the wireless industry.
• JSR 205 WMA version 2.0
• The WMA version 2.0 extends the WMA version 1.1 and
defines additional services.
JTWI Java Technology for the Wireless Industry
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What are Java APIs?
Supported Java APIs
• JSR 211 Content Handler API
• The Content Handler API defines services to handle multimedia and
web content so developers can create a seamless and integrated
user environment on mobile phones and wireless devices.
• JSR 226 Scalable 2D Vector Graphics API for Java ME
• The Scalable 2D Vector Graphics API defines services for rendering
scalable 2D vector graphics, like the W3C® SVG format.
• JSR 238 Mobile Internationalization API
• The Mobile Internationalization API defines services for providing
culturally correct data formatting, text sorting, and resource
processing.
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What are Java APIs?
• Supported API extensions
• In addition to the standard Java APIs supported in the BlackBerry®
Java® development environment, a number of API extensions are
also supported. These extensions are APIs that are not part of the
standard JSR definitions. They provide greater features and
functionality over what is available in the standard MIDP version
2.0 APIs.
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What are Java APIs?
Supported API extensions
• User Interface
• Used to create all components of the graphical user interface
• Persistent Data Storage
• Used to store persistent custom data within an application
• Networking and I/O
• Used to establish network connections and read or write data to
server-side applications
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What are Java APIs?
• Supported API extensions
• Event Listeners
• Used to respond to user-initiated or system-initiated events on a
BlackBerry smartphone
• Application Integration
• used to integrate custom applications with existing BlackBerry
email message, phone, calendar, contacts, browser, camera,
media player, and task list applications
• Additional Utilities
• used for data encryption and compression, XML parsing,
Bluetooth connectivity, and location-based services
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• Summary
• An API is an exposed area of interaction between a library of
services and the program that consumes those services. An API
usually defines the following items:
• code vocabulary
• naming conventions
• function and subroutine syntax
• public and private objects
• data structures
20
• Summary
• APIs can be either language dependent or language agnostic.
Language dependent APIs provide APIs that serve as frameworks
to expand the abilities and services of a particular programming
language. Language agnostic APIs define services that can be
made available to programming languages.
• The Java APIs used for application development for the BlackBerry
smartphone are language dependent APIs. They provide
frameworks built in the Java language for use by other Java-based
applications.
• The main development platform for the BlackBerry is Java® ME.
Java ME is an industry standard set of Java APIs that defines
services for various embedded and mobile devices.
21
• Summary
• The BlackBerry smartphone supports the MIDP standard and the
approximately 85 different APIs that are part of the standard. This
core set of functionality provides the majority of the APIs required
for the BlackBerry device. In addition to this core functionality,
BlackBerry development also supports many other APIs.
• In addition to the standard Java APIs supported in the BlackBerry
development environment, a number of API extensions are also
supported. These extensions are APIs that are not part of the
standard JSR definitions. They provide greater features and
functionality over what is available in the standard MIDP version
2.0 APIs.