Sun Microsystems, Inc.
4150 Network Circle
Santa Clara, California 95054
U.S.A. 650-960-1300
Porting MIDP
MIDP Reference Implementation, Version 2.0 FCS
Java™ 2 Platform, Micro Edition
November, 2002
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iii
Contents
Preface xi
1. Introduction 1
1.1 Product Architecture 2
1.2 Porting Requirements 4
1.2.1 Hardware Requirements 4
1.2.2 Software Requirements 5
1.2.3 Compiler Requirements 6
1.2.4 Requirements of the Completed Port 7
2. Beginning a MIDP Port 9
2.1 Preparing to Port MIDP 9
2.2 Porting Device-Specific Configuration Code 11
2.3 Trying It Out 12
3. The Event Model 13
3.1 Event Model Overview 13
3.2 Events From the Virtual Machine 14
3.3 Events From MIDP 15
3.4 Native Functions 16
4. Persistent Storage 17
4.1 Porting the Native Layer 18
4.2 Customizing the Java Layer 19
iv Porting MIDP • November, 2002
5. Thread-Safety in LCDUI 21
5.1 Requirements 21
5.2 Design Approach 22
5.3 Coding Conventions 23
5.3.1 General Conventions 24
5.3.2 Public Method Conventions 24
5.3.3 Constructor Conventions 26
5.3.4 Event-Handling Method Conventions 27
5.3.5 Application Callout Conventions 27
5.3.6 Graphics Conventions 29
5.4 The serviceRepaints Method 30
6. LCDUI Graphical User Interface 31
6.1 Overview 31
6.2 Issues in Porting Low Level API Functionality 32
6.2.1 Drawing Graphics Primitives 32
6.2.2 Porting PNG Transparency 40
6.3 Using Native Widgets for MIDP Screens 42
6.3.1 General Instructions 42
6.3.2 Example: Replacing Part of DateField 43
6.3.3 Pop-Up Choice Groups 51
6.4 Porting the Game Package 52
7. Security 53
7.1 Overview 54
7.2 Permissions 55
7.3 Key Storage 56
8. Networking 57
8.1 Porting the Native Layer 58
8.2 Customizing the Java Layer 58
8.2.1 Generic Connections 59
8.2.2 Comm 59
Contents v
8.2.3 IP Support 59
8.2.4 Secure Connections 60
8.2.5 HTTP 1.1 61
8.2.6 HTTPS 63
8.2.7 Internal Utilities 64
9. The Application Management System 65
9.1 Porting main.c 66
9.2 Customizing AMS 66
10. Push Functionality 69
10.1 Design Considerations 70
10.1.1 Protocols 70
10.1.2 Listening for Incoming Data 70
10.1.3 Message Buffering 70
10.1.4 User Interaction 71
10.1.5 MIDlet Concurrency 71
10.2 Porting the Native Layer 72
10.3 Customizing the Java Layer 73
11. Porting the Audio Building Block 75
11.1 Overview 76
11.1.1 Architecture 76
11.1.2 Implementing the Player Interface 77
11.2 Porting Synthetic Tones 79
11.2.1 Architectural Considerations 79
11.2.2 Generating Single Tones 86
11.2.3 Generating Tone Sequences 86
11.3 Porting Sampled Audio 88
11.3.1 Architectural Considerations 88
11.3.2 Implementing the Playback of Sampled Audio 90
12. Building Your Port 95
