Motorola J2ME Specifications Page 25
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5
Application Management
25
MIDlet Suite Updating
When a MIDlet Suite is de-installed, all of its resources are removed including any
resources that were created by the MIDlets in the suite, such as RMS databases. If a user
gets a new version of a MIDlet Suite, then the user can simply download that new version
to the device that has the older version installed. Once the new version is downloaded,
the user will have the option to update the MIDlet Suite, causing the old version to be de-
installed, followed by the immediate installation of the new MIDlet Suite.
A newer version of the MIDlet Suite should know how to use, upgrade, or remove the data
in the RMS databases created by older versions. This idea of forward compatibility should
not be extended to backward compatibility, because the C370, C450, and C550 device
will not allow a user to update a version of a MIDlet Suite with an older or equal version of
that MIDlet Suite. If an older or equal version attempts to be installed, the C370, C450,
and C550 will ignore the installation and launch the current version of the MIDlet suite.
Starting, Pausing, and Exiting: AMS Control of MIDlet
State Transitions
A MIDlet has three different states: Destroyed, Active, and Paused. A MIDlet’s natural
state is destroyed. The AMS typically controls the transition through these states. When a
user decides to launch a MIDlet, the device puts up a screen indicating that the MIDlet is
transitioning through these states. The AMS notifies MIDlets about state transitions by
calling the MIDlet’s methods, startApp(), pauseApp(), and
destroyApp().
The figure below shows the MIDlet starting screen.
Note: This image reflects a 176 x 220 display for document readability purposes only. The
C370, C450, and C550 maintain a 96 x 64 display.
The constructor of the MIDlet’s class that extends MIDlet is first invoked. Then its
startApp() method is called to indicate that it’s being started. The MIDlet will have
focus when its startApp() method finishes execution. If a MIDlet takes too long
- Technical Manual 1
- Motorola C370, C450, and 1
- C550 Series of Handsets 1
- J2ME™ Developer Guide 1
- Table of Contents 2
- Introduction 5
- References 6
- Revision History 7
- Document Overview 8
- J2ME Introduction 10
- The Motorola J2ME Platform 11
- Resources Available 11
- Developing and Packaging 13
- J2ME Applications 13
- Downloading Applications 15
- Starting Applications 17
- Exiting Applications 17
- Downloading MIDlets 18
- Error Checks 18
- XML Screen Renderings 19
- --This is the 20
- Application Management 22
- MIDlet Suite Installation 23
- MIDlet Suite De-installation 24
- MIDlet Suite Updating 25
- State Transitions 25
- Java System 29
- Network API 31
- Class Descriptions 32
- TCP Sockets 34
- UDP Sockets 34
- Implementation Notes 34
- LCDUI API 36
- Gaming API and Sound 38
- BackgroundMusic Class 39
- GameScreen Class 40
- GameScreen Methods 41
- Using GameScreen 43
- ImageUtil Class 44
- Using ImageUtil 45
- PalleteImage Class 46
- Using PalleteImage 47
- PlayField Class 48
- Using Sprites 49
- Defining View Windows 49
- PlayField Constructor 49
- PlayField Methods 51
- Using PlayField 54
- SoundEffect Class 55
- Sprite Class 55
- Animation Frames 56
- Sprite Drawing 56
- Sprite Constructor 56
- Sprite Methods 57
- Using Sprite 60
- Java Gaming Sound API 61
- Max MIDI Extension Support 61
- Vibe and Backlight 62
- Overview 63
- Creating a Message 63
- Sending a Message 64
- Permissions 64
- JAD Attributes 65
- Record Management System 67
- Caveats 68
- Phonebook Access 69
- Appendix A: 79
- Key Mapping 79
- Appendix B: 81
- Memory Management 81
- Calculation 81
- Appendix C: 82
- Appendix D: 83
- Spec Sheets 83
- Motorola C370/C450 84
- Motorola C550 84
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