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Overview of J2ME

Overview of J2ME. Framework of Java Solution. J2ME Software Layers. PDAP. 選擇性規範 Optional Packages. 應用程式規範 Profiles. 硬體最小規範 Configurations. 虛擬機器 Virtual Machine. Configurations. 硬體最小規範分兩種 CDC (Connected Device Configuration) 連結式裝置規範

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Overview of J2ME

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  1. Overview of J2ME • Framework of Java Solution

  2. J2ME Software Layers PDAP 選擇性規範 Optional Packages 應用程式規範 Profiles 硬體最小規範 Configurations 虛擬機器 Virtual Machine

  3. Configurations • 硬體最小規範分兩種 • CDC (Connected Device Configuration) • 連結式裝置規範 • 適用於記憶體與電源支援度較高的裝置如: Set-top Box, Pocket PCs, Communicator • CLDC (Connected Limited Device Configuration) • 限制式連結式裝置規範 • 適用於記憶體與電源支援度較低的裝置如: 手機, PDA, 呼叫器 • 目前有CLDC 1.0 與 CLDC1.1兩種版本

  4. Configurations(cont’d)

  5. Profiles • 應用程式規範 • Mobile Information Device Profile (MIDP) • 手機專用之應用程式規範 • 現有MIDP 1.0 與 MIDP 2.0 兩種版本 • Foundation Profile • Personal Profile • RMI Profile • Multimedia Profile • Gaming Profile • Personal Basis Profile

  6. J2ME Software Layers 應用程式規範 Profiles 硬體最小規範 Configurations 虛擬機器 Virtual Machine CDC CLDC

  7. JSR in J2ME

  8. First MIDlet MIDlet, Mobile Information Device small program • 引入套件 • import javax.microedition.midlet.*; • 繼承抽象MIDlet類別 • public class FirstMIDlet extends MIDlet • 實作三個抽象方法 • public void startApp() • public void pauseApp() • public void destroyApp(boolean)

  9. See: FirstMIDlet.java 實作三個抽象方法 First MIDlet 繼承抽象MIDlet類別 套件封裝 引入套件 建構子(不一定要有)

  10. Lifecycle of MIDlet • 程式啟始後, KVM自動呼叫建構子然後進入Paused狀態 • KVM自動呼叫startApp()進入Active狀態 • 若有來電或按暫停鍵KVM呼叫pauseApp()進入Paused狀態 • 解除暫停, KVM呼叫startApp()重新進入Active狀態 • 關閉程式, KVM呼叫destroyApp()進入Destroyed狀態

  11. See: HiSmallWorld.java Display

  12. See: CompulsiveMIDlet.java Compulsive notifying • 強制狀態轉移

  13. To Do After Class • Read Chapter 2, 3, 4 • Discuss your project with your teammatesPS: Final list of teammates and project topic will be due on 2006/3/16小組名單與題目於3/16前e-mail給老師

  14. High-Level User Interface Display List TextBox Alert Form TextField StringItem ChoiceGroup Spacer Next Week... • DateField • Gauge • ImageItem • CustomItem

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