Mobile app development using Android SDK
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The document provides an overview of mobile app development using the Android SDK, highlighting its software stack and key components like the Linux kernel and Android runtime. It outlines steps for app development, including the required tools, coding logic, testing, publishing, and security measures involved. The document also covers resource management in Android and advice for developers on creating and publishing their applications.
Mobile app development using Android SDK
- 1. Mobile App Development using Android SDK Josh Clemm October 27, 2010
- 2. Agenda ● Overview of Android ● Overview of Android App framework ● Application Development walkthrough ● Demos!
- 3. What is Android? ● Complete software stack for mobile devices ● Operating system based on Linux ● Middleware ● Mobile applications ● Developed by Google ● The Android SDK ● Provides tools and APIs to develop apps in Java
- 4. LINUX KERNEL LIBRARIES ANDROID RUNTIME APPLICATION FRAMEWORK APPLICATIONS Home Contacts Phone Browser … Activity Manager Window Manager Content Providers View System Package Manager Telephony Manager Resource Manager Location Manager Notification Manager Surface Manager Media Framework SQLite OpenGL | ES FreeType WebKit libcSSLSGL Core Libraries Dalvik Virtual Machine Display Driver Camera Driver Flash Memory Driver Binder (IPC) Driver Keypad Driver Wifi Driver Audio Drivers Power Management
- 5. Linux Kernel ● Android relies on core Linux 2.6 services ● Security ● Memory management ● Process management ● Network stack ● Driver model LINUX KERNEL Display Driver Camera Driver Flash Memory Driver Binder (IPC) Driver Keypad Driver Wifi Driver Audio Drivers Power Management
- 6. Android libraries ● C library (Bionic) ● Media libraries ● LibWebCore – web browser engine ● SGL – 2G graphics engine ● 3D libraries – based on OpenGL ES 1.0 ● FreeType – bitmap/vector rendering ● SQLite relational database LIBRARIES Surface Manager Media Framework SQLite OpenGL | ES FreeType WebKit libc SSL
- 7. Android Runtime ● Provides most of the functionality of Java’s libraries ● Apps run in its own process within its own Dalvik VM ● Optimized for minimal memory ● Register-based vs. stack-based ● JIT compilation ANDROID RUNTIME Core Libraries Dalvik Virtual Machine Java Source Code Java Byte Code Dalvik Byte Code Dalvik Executable Dalvik VM
- 8. APPLICATION FRAMEWORK Application Framework ● Open/consistent development platform ● Activity Manager controls lifecycle of app ● Access location information ● Run background services, add notifications to the status bar, and more… Activity Manager Window Manager Content Providers View System Package Manager Telephony Manager Resource Manager Location Manager Notification Manager
- 9. Android Applications ● Let’s walkthrough… ● Installing what you need ● Writing your app ● Layouts, Logic, and Images ● Testing and debugging with emulator/device ● Publishing to App Market
- 10. Android Applications ● How to get started ● Install Java 5 or 6 ● Download Android SDK ● (Optional) Install Eclipse IDE ● (Optional) Install Android Eclipse Plugin (ADT) ● The ADT plugin can manage installs of various Android versions. ● It’s easy to get the latest releases
- 11. App Development ● Come up with an idea ● Determine the layout of the screens ● Code logic ● Customize look and feel
- 12. App Development - Layouts
- 13. App Development - Logic ● An activity can represent one screen ● There’s an activity lifecycle: onCreate(), onStart(), onResume(), onPause(), onStop(), onDestroy() ● An activity can have multiple views ● Tabs, lists, a map
- 14. App Development – running ● Use built-in emulator ● Mimic any target device ● Slow and can’t do everything ● Run on Device ● Fast, debuggable
- 15. Demos ● Cool things like ● Embedded map views ● Embedded web views ● Using location ● Using accelerometer
- 16. Questions?
- 17. Resources ● http://www.openhandsetalliance. com/android_overview.html ● http://developer.android. com/guide/basics/what-is-android.html ● http://en.wikipedia. org/wiki/Android_% 28operating_system%29 ● Myself
- 18. Backup Slides
- 19. Publishing and beyond ● Before publishing remember… ● Create an icon ● Be able to support multiple screen sizes ● Be able to support multiple OS versions ● You might want to support multiple languages
- 20. Publishing and beyond ● Sign your apps ● Add your App to Android Market ● Also possible to use third-party app markets ● Register as an Android developer ($25) ● Upload and watch the downloads fly!
- 21. Security And Permissions ● No App has permission to do anything that would impact another app ● Apps run in its own process ● It’s a secure sandbox ● Permissions required are declared before a user installs the app
- 22. Filesystem and Database ● Each app has its own unique file system on the phone’s internal memory ● App preferences, databases, flat files reside there ● The SD card is a better resource for storing larger files (like for a game)
- 23. Android Resources /res folder R.java Android package Your code ADT generates Reference Constants Runtime
- 24. App Components ● Reusable components ● Views – GUI widgets like lists, grids, text boxes, embedded web browser ● Content providers – access data from other apps (Contacts) ● Resource manager – access to non-code resources (graphics, layouts, strings) ● Activity manager – lifecycle of apps