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Understanding JSR 185 - Quick notes

  • Reduces fragmentation
  • Improves interoperability
  • Foundation for next gen. devices.
  • Functionality
    • Required
      • CLDC 1.o
      • MIDP 2.0
      • WMA 1.1
    • Optional
      • MMAPI
  • Size
    • JAR 64KB
    • JAD 5KB
    • Persistent Storage 30KB
    • Devices can use more but one cannot expect more.
    • Heap size 128K required, 256K Recommended.
  • Tickers(wake-up timers)
    • Open ended in MIDP not required
  • UI
    • Screen size
      • 96X54 screen size, 1 bit color depth required
      • 125X125 required, 12 bit color depth recommended
      • JSR 185 jpeg support, MIDP png support
  • Text Messaging
    • SMS capability required on GSM/UMTS networks
    • Text box, Text field required.
    • Phone book capability required to fill text field required on MIDLet.
  • Multimedia
    • MMAPI
    • MIDI and tone sequence support
    • 8 bit 8Khz mono PCM WAV supprt required for audio capture
    • JPEG support
  • Security
    • Vague about protected domain defintion
    • Specifies GSM/UMTS device behavior on untrusted code

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