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Introduction to mobile platforms
 

Introduction to mobile platforms

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    Introduction to mobile platforms Introduction to mobile platforms Presentation Transcript

    • Mobile DevelopmentMicrosoft Mobile PlatformsRob MilesDepartment of Computer Science
    • Introduction A bit of history > Where the Pocket PC came from > Where the Smartphone came from > Pocket PC Phone Edition At bit of architecture > How the platforms run the programs > Why managed code is wonderful A bit of construction > The tools you will need
    • Pocket PC Originally called the “wallet PC” Launched in 1996 with Version 1.0 of Windows CE Superseded in the following year with Version 2.0 Initially available in keyboard and keyboard-less versions
    • Breakthrough Pocket PC: Compaq Ipaq This was the first device to deliver on performance, display and battery life > 120MHz processor > 32MB of RAM > Flash ROM > RS232 and IR ports > 240x320 TFT colour display
    • State of the art Pocket PC Dell Axim V50s > 624Mhz Processor > 64MB RAM > 480x640 colour display > WIFI and Bluetooth > 3D Graphics accelerator Windows Mobile 5 upgradeable £150 less than the original IPAQ!
    • Smartphone In 2001 Microsoft announced that it would be launching a range of Smarpthones (codenamed "Stinger") The Smartphones would be "Windows based" The version of Windows in question was Windows CE 3.0 Launched in October 2002 with Orange SPV
    • Breakthrough Smartphone:SPV E200 First to deliver on performance and battery life: > 32MB user memory > Built in Bluetooth support > Built in camera > Smartphone 2003 Operating System > .NET Compact Framework
    • State of the art Smartphone:SPV C500 Launched in August 2004 > 64MB of internal memory > Fast internal processor (200 MHz) > Small form factor > Runs Windows Mobile 2003 Second Edition Being replaced by the C550 which adds Media Player 10 for protected content
    • Pocket PC Phone Edition Combines PDA with phone > Launched in July 2002 > 206-MHz Intel StrongArm processor > 32MB RAM > Based on Pocket PC 2002
    • Breakthrough Device:XDA II Launched in April 2004 > 400MHz Processor > 128MB RAM > Camera > Bluetooth > Windows Mobile 2003
    • State of the Phone Edition:XDA IIS Launched in April 2005 > Integrated Keyboard > Improved performance
    • What you should be savingup for…. First 3G Windows Mobile Device > Branded as Orange M5000 > VGA resolution display (640x480) > WIFI support > Two cameras > Windows Mobile 5.0 Want one
    • Other devices of note Gizmondo > Offers a Windows CE based gaming platform with GPS, GPRS and 3D Acceleration built in > Licensed developers only (sadly) Imate JAM > Very small Pocket PC phone edition > New form factor for Pocket PC
    • The Future… The development of the devices over the last few years has been amazing The systems are going to get more powerful and more connected Location based behaviour is now very easy to implement in systems
    • Architecture If you write programs for the mobile devices you should plan to work in the Compact Framework using “managed” code This makes your programs > Portable > Safe > Easy to write
    • Managed and Native Code Managed .NET Compact Code User Framework Program Class Libraries Native (Unmanaged Code) User Program.NET Compact Framework CommonLanguage Runtime Processor and Operating System Services
    • Native (unmanaged) code Programs are compiled to machine code for the target processor Created in C++ or Visual Basic and compiled for the specific hardware in the device Has direct access to the processor instruction set Scary stuff for uber-geeks
    • Managed Code Programs execute within a managed environment Microsoft Intermediate Language (MSIL) is Just In Time compiled on the target device Code is not produced for a specific target hardware Code is validated before execution Helps programmers sleep at night
    • Managed Code is Best You should concentrate on managed code development > it is easier and faster to create > programs are inherently more reliable and easier to debug However, we need to be aware that there is a performance penalty for working this way > the first time a method is called the run time system must "Just In Time" compile the MSIL code for that method into machine code > this can lead to delays when programs start up and, sometimes during execution when new classes are loaded
    • Inside a Managed CodeProgram Because the executable is a .NET program you can use ILDASM and other tools to manipulate it You could even create MSIL applications for mobile devices if you wish
    • P/Invoke is your friend If you need to get “down and dirty” from managed code you use Platform Invoke (P/Invoke) This provides marshalling of data to and from calls to native methods You will use this to access some parts of the operating system the Compact Framework cannot reach: > Device Data: Battery Life etc > Placing Calls and SMS messages
    • So, Rules To Code By Use Managed Code wherever possible Good reasons to use Native Code: > You *really* want speed > You *really* want to drive the hardware directly > You are being paid *really* large sums of money to do it Compromise > If you need native code, put it in a native code library and then talk to it via the Platform Invoke (P/Invoke) mechanism
    • Writing the Code You can use C# if you like (in fact I insist) You can use Visual Studio A lot of the forms behaviours map directly across to the mobile platform You do not need a real device > Unless you want to place phone calls or send/receive SMS messages
    • Visual Studio 2003 Visual Studio 2003 as supplied will develop managed code applications for the Pocket PC By adding the Smartphone Developer kit to Visual Studio 2003 you can use this to develop Smartphone applications The Smartphone Developer Kit is a free download, but you need to have Visual Studio to make use of it
    • Visual Studio 2005 This is a significant advance over Visual Studio 2005 The Forms editor now functions with a more complete emulation of the mobile device display The emulation of the devices is now at processor level rather than an 8086 version of the device You can pick up Beta 2 for free!
    • Deploying the Program When the program is executed from within Visual Studio it is copied into a directory on the target device and executed from there You can deploy the program just as an executable file if you wish, by copying it into a directory on the Smartphone using the ActiveSync Or you can build an installer
    • Debugging The debug tools are very powerful You can: > Pause an executing program > Add a breakpoint to an executing program without stopping it These facilities work on the target device too You must however have used Debug mode to build the application The Remote Display Power tool can be useful here
    • Finding the Program The more recent mobile phones are shipped with file browser programs you can use to find and run the executable directly Pocket PC owners can use the built in file browser
    • Developers Toolkits… To start to develop you need: Visual Studio 2003 > Active Sync. 3.7 or better > Smartphone 2003 tools Visual Studio 2005 > Active Sync. 4.0 Powertoys > You should also get the Power Toys
    • Call to Action The devices out there are getting really powerful and connected They are about as easy to write for as desktop machines This is a genuinely new area where the scope for innovation is huge So get out there and get started!