Google Android Development James Williams BarCamp SD

Google Android Development

James Williams

BarCamp SD

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

What is Google Android?

Building blocks of an Android App

Demo

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

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

Building Blocks Activities Intent Permissions Services Content Providers

Activities

Intent

Permissions

Services

Content Providers

Activity Life Cycle

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

Objects that know how to draw themselves on the screen

Equivalent to Java Swing components

Can layout in code or in XML

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>

<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>

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

A declaration to the OS that you want to do something (pre-defined action)

VIEW (url, contact, pictures)

PICK

EDIT

DIAL

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

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

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

$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

Demo

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

Android

http://www.android.com

Android Market

http://www.android.com/market

DroidDraw

Construct GUIs visually - http://www.droiddraw.org/

Twitter/FriendFeed: @ecspike