MIDP Style Guide for the Java 2 Platform, Micro Edition

2.2 Changes from MIDP 1.0 to MIDP 2.0

The MIDP 2.0 Specification [19] enhances and extends the MIDP 1.0 Specification [19]. The MIDP 2.0 Specification adds the following functionality to MIDP.

• Application delivery and installation (over-the-air provisioning was only a recommended practice in MIDP 1.0)

• Application signing model and privileged domains security model

• Support for receiving pushed data

• Networking ?In addition to the MIDP 1.0 HTTP API, MIDP 2.0 has:

  - HTTPS

  - Comm

  - Datagram

  - Sockets

  - Server sockets

• Sound

• Timers

• New UI components:

  - CustomItem

  - Pop-up choice group

  - Spacer

  - Game canvas

• Graphics ? Has new capabilities, such as copying an area from one place on a graphic to another

• Updated form and form items (the following list provides highlights, but is not an exhaustive list of changes.)

  - ChoiceGroup ? A MIDlet can now request a text policy (e.g., TEXT_WRAP_ON) and specify fonts
  
  

  - Form ? New layout policy
  
  

  - Gauge ? Can now specify states for the gauge, such as CONTINUOUS_RUNNING
  
  

  - ImageItem ? Has new appearance modes, such as BUTTON and HYPERLINK
  
  

  - Item ? Can now specify a minimum height and width, a preferred height and width, and a layout directive (layout directives were only for image items in MIDP 1.0)
  
  

  - StringItem ? Has new appearance modes, such as BUTTON and HYPERLINK
  
  

  - TextField ? Has new constraints (such as DECIMAL) and new modifiers (such as UNEDITABLE)
  
  

• Other updated UI components:

  - Alert ? Can have commands and a gauge
  
  

  - Canvas ? Has a full-screen mode: can have a ticker
  
  

  - Choice ? Has a new type of choice (pop-up) and new text policies (such as TEXT_WRAP_ON)
  
  

  - Command ? Can now have a short and a long label
  
  

  - Display ? Has backlight and vibrate functionality
  
  

  - Displayable ? Has ticker and title
  
  

  - Image ? Can now handle transparency
  
  

  - Lists ? Implicit lists can specify a default command
  
  

  - Screen ? The ticker and title commands were moved from here to Displayable
  
  

  - TextBox ? TextField's updates affect TextBox
  
  

  - Ticker ? Can now be attached to a Displayable