The J2ME Multimedia Profile in Java

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The J2ME Multimedia Profile
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The J2ME Multimedia Profile can be found at http://jcporg/jsr/detail/135jsp This proposed multimedia API specification gives developers high-level access to the sound and multimedia capabilities of J2ME devices Although many mobile devices can only produce single monophonic sounds, others feature both sampled, synthetic audio and other rich media types The J2ME Multimedia Profile will be able to handle, generate, and playback sound in all these formats Simple controls will handle the lower common denominator, and additional functions will be available for devices that support more advanced audio The Multimedia Profile will also allow for time-based synching of images with audio, using formats similar to SMIL
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As there are tons of different types of devices, there are different types of Java PersonalJava cleverly brings the power of the Java Standard Edition into smaller spaces In the next chapter, we'll look at yet another breed of Micro Java NTT DoCoMo's iAppli profile This profile will allow you to develop kick-butt Java applications in Japan and beyond
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22 iAppli: Micro Java with a Twist
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IN THIS CHAPTER
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The Architecture of It All iAppli: Like MIDP, But Not Quite Developing iApplis Summary
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In 6 we looked at i-mode, NTT DoCoMo's popular wireless network Just as WAP is too limited for true interactive applications, i-mode is too simplistic for apps such as games that require quick reactions, decent graphics and animations, always-connected networking, and sounds Like many other mobile phone manufacturers, NTT DoCoMo decided that Java was the answer However, at the time of this decision, the MIDP specification was just beginning to be fleshed out and taken seriously NTT DoCoMo, unfortunately, didn't have time to wait They also wanted to create a library specially geared toward their particular service, brand, and mobile phone constraints So NTT DoCoMo built atop the CLDC basics and came out with their own Micro Java profile It has lots in common with MIDP, but branches off in some interesting and weird directions Instead of MIDLets, NTT DoCoMo's Java apps are known as iApplis The first Java handsets went on sale in Japan in January 2001 A full list of current phones capable of running iApplis can be found in 2, "The Mobile World" NOTE While reading about iApplis on the Web, you might come across the word keitai This is a Japanese word meaning "portable," and is often used in the vernacular to refer to mobile phones (keitai denwa)
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The Architecture of It All
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iAppli applications can run on any 50x series of i-mode phone The extensions library basically sits atop the CLDC class library Like MIDP, iApplis are based on a subset of the javalang, javaio, javautil, and javaxmicroeditionio classes iApplis are defined using five special packages: comnttdocmoio, comnttdocmoutil, comnttdocomoui, comnttdocomonet, and javaxmicroeditionio In addition, like MIDP, the i-mode library runs using the KVM Additionally, various phone manufacturers might add additional functionality and handset-specific libraries The architecture looks something like Figure 221 Figure 221 The iAppli architecture
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Basically, the i-mode extension library handles the following:
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User Interface Graphics and clear interface widgets are a major focus for NTT DoCoMo For example, iAppli supports i-melody sounds and i-anime animated images Networking All communication occurs using HTTP Fully functional client-server application can be run, allowing for true multiplayer gaming or games that change over time based on input from a central server Scratchpad Applications or data downloaded from the networks can be stored on the mobile phone This allows for permanent storage of a user's most useful applications Scratchpad is the storage memory where "files" can be saved and loaded Text Conversion iAppli handles all Japanese language processing Just like i-mode's browser, iAppli deals with the Shift JIS (SJIS) Japanese character encoding Java applications can also display the emoji picture symbols used throughout i-mode
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In addition to providing room for the iAppli classes, media, and ScratchPad, each handset has a Java Application Manager (JAM) that controls the activation of applications in i-mode phone terminals
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