Android
Info mostly based on Pro Android 3
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User Applications
Java Libraries – most of Java standard edition
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Activities/Services
UI/Graphics/View – modern UI, not Swing
Resources/Content Providers
Telephone/Camera
Multi-Media
SQLite Database
Http/Connectivity
Java SE/Java Apache
Dalvik VM – Virtual machine (optimized JVM)
Core C libraries
Linux
Where is Dalvik?
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Processor Emulator
Mimics most device features (headphones,
bluetooth, battery, etc.)
C-based framework
C++ Microsoft Foundation
Classes
Java-based Swing
Design flexibility, portability
Android UI, JavaFX, Microsoft
Silverlight, Mozilla XML User
Interface Language (XUL)
UI is declarative and
independently themed
Lifecycle is managed by the
system
• Limited resources
• System determines priority,
may shut down to free
resources
Callbacks to handle state
changes
• onCreate, onStart, onRestart,
onResume, onPause, onStop,
onDestroy
• App doesn’t need to respond
to all of these
• Mostly handle onCreate,
onResume, onPause
• Be sure to call superclass
versions for any method you
write
http://androidstutorial.blogspot.com/2012/08/lifecycle-of-android-activity.html
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View. UI elements.
Activity. UI concept. Usually a single screen.
May contain one or more views. An app may
contain several activities. Example: view data,
create data, edit data.
Intent. Intention to do some work. May:
broadcast a message, start a service, launch
an app, etc.
Content Provider. Work with data.
Service. Background processes that can run
for along time. May be local or remote.
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LogCat
Log.v(TAG, “Message”);
Can’t use with MyLyn (remove plugin)
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Install Eclipse for Mobile Developers (or use
existing Eclipse)
Remove the MyLyn files so LogCat will work
Install the ADT plugin from:
https://dl-ssl.google.com/android/eclipse/
Update the ADT tools (Window->ADT
manager, see next slide)
Manage your list of devices
Click the AVD Manager button
Click New to add a new one (this list is initially blank)
Create a Device
Pick target
Specify memory
Add Keyboard
support
Launch the Emulator
Click on your device
Press Start
(will also start if you run a program)
Don’t close between runs!
Launch the Emulator, second screen
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Use the Android Project wizard
Mostly accept prompts
Do tutorials