Android GUI Project课件.ppt

精品文档 John Hurley CS 454 精品文档 Android 1. Android Basics 2. Android Development 3. Android UI 4. Hello, World 5. My Project 精品文档 Android Basics Open source OS Uses Linux kernel Optimized for limited-resource environment Apps typically written in Java Apps run on the Dalvik Virtual Machine Not a JVM, but works similarly from developer’s point of view Usually one app per DVM Each DVM runs under Linux as a separate user App permissions set at install time Possible to use C or C++ compiled to machine code, but still runs on VM. It’s not clear to me how this works. Docs say it does not necessarily improve performance. 精品文档 Sams Teach Yourself Android?Application Development in 24 Hours (0321673352) Copyright ?2010 Lauren Darcey and Shane Conder FIGURE 5.6 Simplified Android platform architecture from a security perspective. 精品文档 Android Development Well-defined framework for app development Apps are typically coded using Java syntax, but other parts of the Java platform are missing Some standard Java SE or ME APIs and class libraries are not included I will give examples when I find out! 精品文档 Android Development Standard development environment is Eclipse + Android Development Tools plugin + Android SDK Development requires either an Android OS device or an emulator Emulator has limitations: Performance is poor Camera, etc., simulated using your computer’s hardware No real phone calls or texts GPS data, battery readings, etc. must be simulated Real device is affected by specific hardware and software configuration 精品文档 Android vs. Other Mobile OS I was able to choose what kind of smart phone to get according to which platform I wanted to use to try mobile development Android: I had Java backend code ready to go for a first project Interesting platform: Familiar programming environment Currently the market leader Broad market, unlike more focused iOS, Blackberry, and (Palm) webOS Development tools are open source and are free even for commercial use, unlike