The document discusses the basics of developing applications for the Android platform. It introduces Android as a software stack for mobile devices based on Linux and using Java for applications. It outlines the basic building blocks of an Android app, including activities, intents, permissions, services and content providers. It provides an example of layout code using XML and describes intents as declarations to perform predefined actions. It also briefly mentions the Android Market for distributing apps and some alternative app stores.

1. Google Android Development James Williams BarCamp SD

2. What is Google Android? Building blocks of an Android App Demo

3. What is Android? Software stack for mobile devices (based on Linux) Uses Java source code for applications* All features of the hardware are accessible to the developer First device is T-Mobile G1, others due next year

4. Building Blocks Activities Intent Permissions Services Content Providers

5. Activity Life Cycle

6. Views Objects that know how to draw themselves on the screen Equivalent to Java Swing components Can layout in code or in XML

7. Sample Layout <LinearLayout xmlns:android=&quot;http://schemas.android.com/apk/res/android&quot; android:layout_width=&quot;wrap_content&quot; android:layout_height=&quot;wrap_content&quot; android:orientation=&quot;vertical&quot; android:paddingLeft=&quot;6dip&quot; android:paddingRight=&quot;6dip&quot; android:paddingBottom=&quot;3dip&quot;> <EditText android:id=&quot;@+id/title&quot; android:maxLines=&quot;1&quot; android:layout_marginTop=&quot;2dip&quot; android:layout_width=&quot;wrap_content&quot; android:ems=&quot;25&quot; android:layout_height=&quot;wrap_content&quot; android:autoText=&quot;true&quot; android:capitalize=&quot;sentences&quot; android:scrollHorizontally=&quot;true&quot; /> <Button android:id=&quot;@+id/ok&quot; android:layout_width=&quot;wrap_content&quot; android:layout_height=&quot;wrap_content&quot; android:layout_gravity=&quot;right&quot; android:text=&quot;@string/button_ok&quot; /> </LinearLayout>

8. Intents A declaration to the OS that you want to do something (pre-defined action) VIEW (url, contact, pictures) PICK EDIT DIAL

9. Permissions Provide low-level access to features (like SMS, GPS, Internet, etc) Declared by the dev at creation time Users are prompted by Android Market when installing the app

10. Android Market (Beta) $25 per developer/entity for unlimited apps Only free apps for the moment Upgrades aren't seamless Paid app alternatives Only Android: http://onlyandroid.mobihand.com/ Handago: http://www.handango.com

11. Demo

12. Resources Android http://www.android.com Android Market http://www.android.com/market DroidDraw Construct GUIs visually - http://www.droiddraw.org/ Twitter/FriendFeed: @ecspike