Android basics
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The document introduces Android programming and provides an overview of key concepts including: - Android applications are developed using Java and compiled into APK files to run on the Android operating system which uses a Linux kernel and Dalvik virtual machine. - The AndroidManifest.xml file contains app metadata and declares app components like activities, services, and permissions. - UI resources like layouts, drawables, and strings are organized by screen density in folders like res/layout-hdpi. Common layouts include LinearLayout and RelativeLayout. - Activities display app screens and follow a back stack model. Fragments allow modular reuse of UI. - Services run in the background, AsyncTask simpl
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Android basics
- 1. Introduction to Android Programming – Workshop Berglind Ósk Bergsdóttir CC-BY-SA 2012
- 2. Android applications Open development platform written in Java
- 3. The Android SDK tools compile the code into an Android package (.apk)
- 4. The Android operating system is a multi-user Linux system ( 2.6 ) in which each application is a different user.
- 5. Each process has its own instance of the Dalvik virtual machine.
- 6. Android Manifest.xml A must for every application in its root directory
- 7. Info about version number, min sdk version, install location
- 9. Declare activities, services, broadcast receievers... launchMode, screenOrientation, theme: android:theme="@android:style/Theme.NoTitleBar"
- 10. UI – resources folder Xml layout files layout-hdpi, -mdpi, -ldpi, -land, -xlarge
- 11. LinearLayout, RelativeLayout Drawables drawable-hdpi, -mdpi, -ldpi Menus and context menus
- 12. Values strings
- 13. UI –LinearLayout
- 14. Activity Typically represents one screen
- 15. Must implement onCreate(Bundle savedInstanceState)
- 16. Needs a view (xml layout file) setContentView(R.layout.activity_layout )
- 17. When a new activity starts, it is pushed onto the back stack "last in, first out" ListActivity
- 18. Fragments (API level 11> = 3.0>)
- 20. Activity Starting an activity
- 21. Getting extras
- 22. Adapters Populates a view with data
- 26. Service Long running operation in background
- 27. startService();
- 28. bindService();
- 29. Runs in the main thread!!
- 30. AsyncTask A neat way to do heavy background thread work like talking to webservice
- 31. defined by 3 generic types, called Params, Progress and Result, and 4 steps, called onPreExecute, doInBackground, onProgressUpdate and onPostExecute.
- 32. Application Base class to maintain global application state
- 33. Instantiated for you when the process for your application/package is created.
- 34. Data Storage Shared Preferences Store private primitive data in key-value pairs. Internal Storage Store private data on the device memory. External Storage Store public data on the shared external storage. SQLite Databases Store structured data in a private database. Network Connection Store data on the web with your own network server.
- 35. Shared prefs
- 36. Debugging adb (Android Debug Bridge) is a command line tool to communicate to device/emulator <sdk>/platform-tools/adb logcat
- 37. Logcat also in Eclipse Log.d(TAG, “This is a log msg”);
- 38. v(verbose), d(debug), i(info), e(error), w(warning) adb logcat *:D
- 39. adb logcat | ~/coloredlogcat.py
- 41. Let's do some coding!!
- 43. Remove ugly title bar on top android:theme="@android:style/Theme.NoTitleBar" Add a button <Button android:text="Button"
- 47. Hello world! Click button to share on facebook/twitter/email Intent intent = new Intent(Intent. ACTION_SEND ); intent.setType( "text/plain" ); intent.putExtra(Intent. EXTRA_SUBJECT , "email subject" ); intent.putExtra(Intent. EXTRA_TEXT , "must be a url to post this text to facebook" ); startActivity(Intent. createChooser (intent, "Share..." ));
- 49. The end Advanced Android workshop later!
- 51. [email_address]
- 52. @beggaboo85