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Android

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Transcript

  • 1. Environment at a Glance for Eclipse
  • 2. Course Curriculum  Module 1 » Basics of Android  Module 2 » Android Layouts and Widgets  Module 3 » Communication and Media  Module 4 » Storage Techniques and Animation in Android  Module 5 » Web Services and Customizations of Widgets  Module 6 » Advanced Android Concepts
  • 3. Eclipse • Eclipse is a multi-language software development environment comprising an integrated development environment (IDE) • Users can extend its abilities by installing plug-ins written for the Eclipse Platform • It is written mostly in Java
  • 4. Eclipse
  • 5. DDMS
  • 6. DDMS • Android ships with a debugging tool called the Dalvik Debug Monitor Server (DDMS) • which provides: – port-forwarding services – screen capture on the device – thread and heap information on the device – LogCat process
  • 7. DDMS
  • 8. Android Emulator
  • 9. Android Emulator • What is an Emulator ? • Why should I use it ? • Can I run Eclipse Applications on my device ?
  • 10. Activity Life Cycle
  • 11. Activity Life Cycle
  • 12. Lifecycle Callbacks
  • 13. View Groups
  • 14. Structure of the Manifest File
  • 15. Manifest File • Manifest presents essential information about the application to the Android system, information the system must have before it can run any of the application's code. • Elements • Attributes • Class names • Multiple values • Resource values • String values
  • 16. App's Launcher Activity • The main activity for your app must be declared in the manifest with these parameters. <activity android:name=".MainActivity"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity>
  • 17. Questions You need to Ask • What is AndroidManifest.xml ? • Why there is a .java file in src/ directory ? • What do we put in res/ directory ? • Inside res/ what are these ? – drawable-hdpi/ – layout/ – values/
  • 18. Values
  • 19. Values • Android will run on many devices in many regions • Whenever the application runs in a locale for which you have not provided locale-specific text, Android will load the default strings from res/values/strings.xml • Different qualifiers can be used for different locales like res/values-fr
  • 20. Locales
  • 21. Drawables
  • 22. Drawable – What are they? • A Drawable is a general abstraction for "something that can be drawn." • Unlike a View, a Drawable does not have any facility to receive events or otherwise interact with the user.
  • 23. Listeners
  • 24. Types of Event Listeners • onClick() From View.OnClickListener • onLongClick From View.OnLongClickListener • onKey() From View.OnKeyListener • onTouch() From View.OnTouchListener
  • 25. Supporting Multiple Screens
  • 26. Supporting Different Screens • Android runs on a variety of devices that offer different screen sizes and densities • System provides APIs that allow you to control your application's UI for specific screen sizes and densities • res/layout/my_layout.xml • res/layout-small/my_layout.xml • res/layout-large/my_layout.xml • res/layout-xlarge/my_layout.xml // layout for normal screen size ("default") // layout for small screen size // layout for large screen size // layout for extra large screen size
  • 27. Supporting Different Screens • xlarge screens are at least 960dp x 720dp • large screens are at least 640dp x 480dp • normal screens are at least 470dp x 320dp • small screens are at least 426dp x 320dp
  • 28. •Q& A..?
  • 29. Thanks..!