摩托罗拉MOTOMAGX Java ME应用开发指南：快速入门与环境设置

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Java_ME_Developer_Guide_for_MOTOMAGX 是针对摩托罗拉运行摩托罗拉操作系统(Motorola OS)的手机开发Java Micro Edition (Java ME)应用程序（通常称为MIDlets）的专业指南。该文档主要关注以下几个核心知识点： 1. **支持API信息**：指南详细介绍了与摩托罗拉设备兼容的Java ME API，这对于开发者来说是至关重要的，因为它提供了编写高效和功能丰富的MIDlets的基础。开发者可以在这里找到关于设备特定的功能接口和库的参考资料。 2. **开发与打包流程**：指南提供了一套详细的步骤，指导开发者如何设计、编码、测试和打包他们的Java ME应用，以便在摩托罗拉平台上顺利安装。这包括了设置开发环境、构建工具链、遵循MIDP（Mobile Information Device Profile）和CLDC（Connected Limited Device Configuration）规范等。 3. **调试环境设置**：对于调试过程，文档描述了如何配置调试工具，以便在开发过程中进行有效的错误检测和性能优化。这对于确保应用质量和性能至关重要。 4. **版权和许可**：作为开发者指南，用户必须遵守严格的版权条款，只能为摩托罗拉产品开发目的打印和复制，并且仅限于两份备份。未经摩托罗拉书面许可，禁止任何形式的复制或改编此文档的内容。 5. **典型参数和性能声明**：虽然某些参数可能在摩托罗拉的数据表和规格书中给出，但实际性能可能会因具体应用和设备而异。因此，客户的技术专家应在每个项目中验证这些“典型”值。 6. **保修和责任声明**：摩托罗拉对文档中所述的产品和服务不作任何保证，包括但不限于适销性和特定用途的适用性。这意味着用户需要自行评估应用是否满足其特定需求，并承担潜在的风险。 Java_ME_Developer_Guide_for_MOTOMAGX是摩托罗拉为Java ME开发者量身定制的实用资源，它提供了必要的技术细节和支持，帮助开发者高效地开发和调试针对摩托罗拉平台的应用程序。通过深入理解和遵循这份指南，开发者可以充分利用Java ME的潜力，为摩托罗拉用户提供优质的移动体验。

Java ME Developer Guide for MOTOMAGX

Overview

• JSR 135 - Mobile Media API

• JSR 139 - CLDC 1.1 API

• JSR-172 - Web Services API

• JSR 177 - Security and Trust Services API

• JSR 179 - Location API for J2ME

• JSR 184 - Mobile 3D Graphics API

• JSR-185 - Java Technology for the Wireless Industry API

• JSR 205 - Wireless Messaging 2.0 API

• JSR-211 - Content Handler API

• JSR-226 - Scalable 2D Vector Graphics API

Supported handsets

Included here is a list of the supported MOTOMAGX handsets, in alphabetic order. Motorola is continually

adding new handset and for the latest supported handsets, refer to http://developer.motorola.com/

products/handsets/.

Table 2: Alphabetic Listing of MOTOMAGX Handsets

Supported MOTOMAGX Handsets

A728, A760, A768, A780, A910, A1200 (MOTOMING A1200)

E680

MOTOMING A1200, MOTORAZR

V8, MOTOROKR E2, MOTOROKR E6, MOTOROKR U9,

MOTOROKR Z6

Z6 (MOTOROKR Z6)

Java ME Developer Guide for MOTOMAGX

Downloading and Managing MIDlets

Chapter 2: Downloading and Managing

MIDlets

Methods of downloading

To deploy a MIDlet to a physical Motorola device, use either over-the-air (OTA) downloading (Bluetooth or

IrDA) or direct cable (USB) downloading through a PC to the target device. The operator can restrict the

MIDlet size.

Method 1–OTA

Using the over-the-air method, you connect—via a wireless network—to a content server, for example,

Apache (http://httpd.apache.org), which is free to use, deployable on multiple operating systems, and has

extensive documentation on how to configure the platform.

To download the required JAD (Java Application Descriptor) or JAR (Java Archive) file, use the browser to

issue a direct URL request either to the appropriate file or to a Wireless Application Protocol (WAP) page

that contains a hyperlink to the target file. In MIDP 2.0, you can download the JAR file directly without first

downloading the JAD file. The manifest file contains information about the MIDlet.

The transport mechanism that downloads the file is one of two depending on the support from the network

operators WAP Gateway and the size of the file requested.

The MOTODEV Technical Articles section, http://developer.motorola.com/, contains a basic OTA server

configuration document, Browser and OTA Provisioning, that includes appendices on parameter mapping

and a compliancy matrix along with details on how to configure the server and also sample WAP pages.

If there is insufficient space to complete an OTA download, the user can delete MIDlets to free-up space.

The handset uses the GET method to download a MIDlet, and the POST method to send the status code

to the server. For a list of status codes, see “Status and Error Codes” on page 145.

The following messages can appear during download:

• If the JAR file size does not match the size specified in the JAD, the handset displays "The installation

you are attempting failed due to an invalid file type. Please try again." Upon pressing “OK”, the handset

goes back to the browser.

• If the MANIFEST file is wrong, the handset displays "The installation you are attempting failed due to

an invalid file type. Please try again." Upon pressing “OK”, the handset goes back to the browser.

• If the JAD does not contain the mandatory attributes, the handset displays "The installation you are

attempting failed due to an invalid file type. Please try again." The handset goes back to the browser

upon pressing “OK”.

Java ME Developer Guide for MOTOMAGX

Downloading and Managing MIDlets

Method 4–Direct cable and Motorola MIDway tool

MIDway, a MOTODEV tool, supports USB cable downloads. For more information about MIDway, see the

Solutions database at http:developer.motorola.com/techresources/techsupport/. Select “Find an Answer”

and type “MIDway” into the Search Text field. It contains the following information:

• MIDway tool executable

• USB driver for the cable

• Instructions on installation

(http://developer.motorola.com/docstools/technicalarticles/Using_MIDway.pdf)

• User Guide for the MIDway tool

(http://developer.motorola.com/docstools/technicalarticles/Installing_MIDlets_Using_MIDway.pdf)

In addition to the software, use a USB-A to Mini-USB cable.

If you are using MOTODEV Studio for your development, use the MWay tool instead of MIDway.

The MIDway tool works only with devices that support direct cable Java download. Direct cable Java

download is NOT available when purchasing a device from a standard consumer outlet.

To confirm support for the MIDway tool, look at the "Java Tool" menu on the handset to see if a "Java app

loader" option is available. If it is not, then contact MOTODEV support for advice on how to obtain an

enabled handset.

Motorola provides a MIDway User Guide. In addition, the MOTODEV website contains:

• "Installing Java™ ME MIDlet using MIDway Tool”, which outlines the current version of the tool

• FAQs about the MIDway tool at http:developer.motorola.com.

The USER_AGENT string

Use the USER_AGENT string (also known as the HTTP agent) to identify a handset and render specific

content to it, based on the information provided in this string; for example Common Gateway Interface

(CGI) on a content server. These strings are located in the connection logs on the content server.

To identify USER_AGENT strings on most Motorola phones, see

http://www.wirelessmedia.com/phones/make-list_make-Motorola.html.

The User Agent Profile (UAProf) specification is used to capture functionality and preference information

for a handset. This information helps content providers adhere to the appropriate format when creating

content for a specific device. Some of the information available in a UAProf file includes model

specifications such as screen size, multimedia capabilities and allowable messaging formats.

UAProf information for most Motorola handsets can be found at http://uaprof.motorola.com/

Java ME Developer Guide for MOTOMAGX

Downloading and Managing MIDlets

Downloading MIDlets

You can download a MIDlet using either a PC connection or a browser. To download a MIDlet through a

PC connection, connect the handset to the PC using IrDA, Bluetooth, or USB. When you successfully

connect a PC to your handset, a message appears stating that a connection has been made. Only one

connection can be active at a time. The preferred methods of download are OTA or MIDway. Bluetooth is

supported on many handsets.

Once connected to the WAP browser, you can search for MIDlets and download them to the handset.

Available memory

A handset initially receives information from the JAD file. The JAD contains the MIDlet-name, version,

vendor, MIDlet-Jar-URL, MIDlet-Jar-size, MIDlet-Data-size, and can also contain Mot-Data-Space-

Requirements, and Mot-Program-Space-Requirements.

Before downloading a MIDlet, the handset checks for available memory. The Mot-Data-Space-

Requirements and Mot-Program-Space-Requirements attributes help the KVM (KJava Virtual Machine)

determine whether there is enough memory to download and install the selected MIDlet suite. If there is

not enough memory, a message is displayed and the application doesn’t download. For information about

“Memory Full” and other error codes, see “Status and Error Codes” on page 145.

If an application developer adds the Mot-Data-Space-Requirements and Mot-Program-Space-

Requirements attributes to the JAD file, a Motorola handset can determine if enough memory exists on the

handset before the MIDlet is downloaded. These attributes may or may not be provided in all MIDlets. Two

separate prompts are displayed, depending on whether these attributes are present.

In cases where there is not enough memory to download the application, the user must be given a

message to delete existing applications to free additional memory.

For more information, see the technical article, “Using JAD Attributes.”

The handset must be able to send and receive at least 30 kilobytes of data using HTTP, between the

server and the client in either direction, according to the Over the Air User Initiated Provisioning

specification.

Rules

• If the Mot-Data-Space-Requirements and Mot-Program-Space-Requirements attributes are present in

the JAD, the message, “Memory Full” is displayed. This value takes into account the memory

requirements of the MIDlet and the current memory usage on the handset to tell the user exactly how

much memory is required. The memory usage is based in kilobyte units. When this error condition

occurs, the download is canceled.

• The label, “Mot-Data-Space-Requirements:”, and the value of the data space should be on separate

lines. The label, “Mot-Program-Space-Requirements:” and the value of the program space should be

on separate lines.

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