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.

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