Intro to Android Development by Philip Peng
- 1. By Philip Peng, 2011-01-12 For PennApps Mobile 2011, University of Pennsylvania All images used in this belong to their rightful owners (not me).
- 2. Why mobile? smartphones = “new thing” portable, powerful Why Android? (over iOS) Linux → Open Source For PennApps Mobile 2011 Consumer-driven apps Philip Peng, 2011-01-12 Hardware/software choice Google <3 Devs
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- 4. For PennApps Mobile 2011 Philip Peng, 2011-01-12 http://icantdrawfeet.com/2010/08/02/android-vs- iphone/
- 5. Overview Java Eclipse Hello World Activity Cycle Try API Demos Stopwatch Example For PennApps Mobile 2011 Logcat/DDMS Debugging Philip Peng, 2011-01-12 Market Publishing and more... Beats and Useful Resource Links
- 6. Android Java Linux, but apps in Java Dalvik Virtual Machine – DVM .apk format ← Eclipse Standard java.* packages Custom graphics/UI code NDK – C/C++ for ARM For PennApps Mobile 2011 Philip Peng, 2011-01-12 (OpenGL ES 2.0, libraries, etc.)
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- 8. Eclipse FOSS, customizable, industry-standard Android-ready Download these (if you haven't already) Eclipse Classic 3.6.1 http://www.eclipse.org/downloads/packages/eclipse-classic-361 Android SDK R8 (get the .zip) For PennApps Mobile 2011 Philip Peng, 2011-01-12 http://developer.android.com/sdk/index.html Java SE Development Kit 6u23 (JDK) http://www.oracle.com/technetwork/java/javase/downloads/inde Code Samples used http://www.stwing.upenn.edu/~pengp/Files/PennApps/PennApp
- 9. Setup (Live Demo!) Install JDK (run installer) Extract Eclipse (e.g. C:/Android/eclipse) Install Android SDK Extract Android SDK (e.g. C:/Android/android-sdk-windows) Run SDK Manager Select packages For PennApps Mobile 2011 (only need Platform-tools, API 9, document, and samples) Philip Peng, 2011-01-12 Download and wait (long) Virtual Devices > New Name: “TestPhone2.3”, Target: Android 2.3 – API Level 9, SD Card Size: 64 MiB Create AVD > Start... > Launch A virtual Android 2.3 phone for testing! Yay o/
- 10. Setup (Live Demo! Continued) Install ADT Plugin for Eclipse: http://developer.android.com/sdk/eclipse-adt.html#installing Help > Install New Software.... > Add https://dl-ssl.google.com/android/eclipse/ → “ADT” Select All > Next > Next > Accept Terms > Finish > Restart Windows > Preferences... > Android Browse (find “android-sdk-windows” folder) > Apply > OK Eclipse is now ready for Android development! For PennApps Mobile 2011 Philip Peng, 2011-01-12 Ready for your Android “Hello World”?
- 11. Hello World File > New > Project > Android > Android Project For PennApps Mobile 2011 Philip Peng, 2011-01-12
- 12. Hello World Add the following lines marked by “// <-----” For PennApps Mobile 2011 Philip Peng, 2011-01-12
- 13. For PennApps Mobile 2011 Philip Peng, 2011-01-12 Run > Run > Android Application Hello World
- 14. Hello World Inspection Package naming convention? Activity, Layout, TextView? R, src, res, AndroidManifest? For PennApps Mobile 2011 Philip Peng, 2011-01-12
- 15. Activity Cycle Activity = methods + Layout + Dialogs Layout = Views, Buttons, etc. App = many Activities Task = stack of For PennApps Mobile 2011 Activities from one Philip Peng, 2011-01-12 app Also: Services, Broadcast Receivers, Content Providers
- 16. API Demos File > New > Projects > Android Project Create project from existing source (C:Androidandroid-sdk- windowssamplesandroid-9ApiDemos) Right click ApiDemos project > Refresh src > com.examples.android.apis > ApiDemosApplication For PennApps Mobile 2011 Run > Run > Android Application (or Ctrl+F5) Philip Peng, 2011-01-12 Explore the demos! Ready to try it yourself?
- 17. Stopwatch 1 Hello World, but need time and screen updating FormattedTime.java and RefreshHandler.java FormattedTime start() - starts timer, returns “00:00:00” stop() - stops timer, returns time “MM:SS:mm” reset() - resets timer, returns “00:00:00” For PennApps Mobile 2011 update() - returns time “MM:SS:mm” Philip Peng, 2011-01-12 RefreshHandler start(delay) - starts calling update() every delay ms stop() - stops calling update() update() - override this with your code
- 18. Stopwatch A Hello World, with FormattedTime and RefreshHandler For PennApps Mobile 2011 But this just Philip Peng, 2011-01-12 keeps running, what about stopping or resetting?
- 19. Views, Images and Buttons, Oh My! Activity.setContextView(layout) Graphical layout → XML Add in Widgets or more Views ViewGroups: LinearLayout, TableLayout, RelativeLayout, ScrollView, For PennApps Mobile 2011 ListView, GridView Philip Peng, 2011-01-12 Widgets/Content Views: TextView, WebView,ImageView ImageButton, Button, Checkbox, EditText, RadioButton See Android documentation for details and more http://developer.android.com/guide/topics/ui/index.html
- 20. Stopwatch B Buttons for Start, Stop, Reset Give TextView an id for reference Good practice: use strings.xml onClick → method For PennApps Mobile 2011 Use GridView or Philip Peng, 2011-01-12 other ViewGroups for nicer layout
- 21. Stopwatch B Cross-reference TextView (recast) onClick must be public void foo(View view) For PennApps Mobile 2011 Philip Peng, 2011-01-12
- 22. For PennApps Mobile 2011 Philip Peng, 2011-01-12 Lets add unnecessary stuff! Stopwatch C
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- 24. More Common Stuff Graphics: http://developer.android.com/ → Static → XML layouts Active → Canvas 3D → OpenGL ES 1.x or 2.0 (NDK) Audio/Video: Playback → MediaPlayer Recording → MediaRecorder Data: Settings → PreferenceActivity & PreferenceManager For PennApps Mobile 2011 Storage → External Storage, SQLite Philip Peng, 2011-01-12 Network: Connectivity → ConnectivityManager Locations → Uri* Interactivity: Multiple activities → Intents Other apps/Content handling → Intent Filters
- 25. Debugging! Logcat!!! (and DDMS later) Log.v(String tag, String msg) Also Log.v, .w, .d, .wtf ADB For PennApps Mobile 2011 android-sdk-*/platform-tools/adb Philip Peng, 2011-01-12 adb push/pull/install adb shell adb logcat
- 26. DDMS (Dalvik Debug Monitor Server) Eclipse integrated Android debugger Windows > Open Perspective > Other... > DDMS Select device, select process Debug, Update Heap, Update Threads Allows inspection of threads, heap, For PennApps Mobile 2011 allocation, files, etc. Philip Peng, 2011-01-12 Also displays Logcat and allows for screenshots!
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- 28. Market and Actual Testing? Windows > Android SDK & AVD Manager Available packages > Third party Add-ons Google Usb Driver and Market Licensing On your actual phone: MENU > Settings > Applications > For PennApps Mobile 2011 Development > USB debugging ON Philip Peng, 2011-01-12 Plug in, compile and run your Android app, select your actual phone (or might auto-select)
- 29. Publishing on the Market http://market.android.com/publish/Home http://developer.android.com/guide/publishing/publis $25 one-time fee for a developer account Make money back via either paid app or advertisements (AdMob) Compare to iOS's $99/YEAR and content For PennApps Mobile 2011 filtering/approval-based system Philip Peng, 2011-01-12 Need to make sure to check support for different screen sizes, Android OS (current is 2.3 but lots still run 1.5/1.6), etc. in AndroidManifest.xml file
- 30. Beats, Advanced Rhythm Game Website: http://beatsportable.com Try it: http://www.tinyurl.com/beatspre14b Examples of: graphics, multi-touch, synchronized audio, menus, settings, dialogs, intent-filters, multiple activities, persistent data, multi-threading, file browser, and more... For PennApps Mobile 2011 Philip Peng, 2011-01-12 (screenshot taken Jan 12, 2011, prior to 1.4b release)
- 31. •Useful Links/Resources #android-dev at freenode.irc.net Android Developers http://developer.android.com/index.html • Dev Guide = fundamentals • Reference = Google's Javadocs • Resources = Tips and conventions • Blog = Newest updates, code examples android-developers@googlegroups.com For PennApps Mobile 2011 http://www.mail-archive.com/android-developers@googlegroups.com Philip Peng, 2011-01-12 StackOverflow – public Q&A http://stackoverflow.com/questions/tagged/android anddev.org – forums with lots of tutorials http://www.anddev.org/ App Inventor Beta – Google's test project http://appinventor.googlelabs.com/about/index.html
- 32. For PennApps Mobile 2011 Philip Peng, 2011-01-12 Questions? Office Hours 8-10pm, Sat. Jan 16