Rajab Davudov Androidlaşdırdıqlarımızdansınızmı ? 2012.01.08

1. Rajab Davudov

2. Agenda
• Eclipse, ADT and Android SDK
• APK file
• Fundamentals
– Activity
– Service
– Content Provider
– Broadcast Receiver
– Intent
• Hello World
• Fake Login App
• Play-Back Service

3. Eclipse + ADT + Android SDK
• Download Eclipse IDE for Java Developers
from http://eclipse.org/downloads/
• Menu [Help/Install New Software] add ADT
site https://dl-ssl.google.com/android/eclipse/
• Download SDK
– Tools
– Android Platforms 4.0, 3.2, … ,2.3.3,2.2, …
– Extras

4. APK File
• AndroidManifest.xml
– Activity, Service etc. list
– Permissions and Features
• classes.dex
– Dalvik bytecodes
• resources.arsc
– Information about resources
• res/
– Resource Files

5. Activity
• An Activity is an application component that provides a screen with which users
can interact in order to do something, such as dial the phone, take a photo, send
an email, or view a map
• Each time a new activity starts, the previous activity is stopped, but the system
preserves the activity in a stack (the "back stack").
• There are several callback methods that an activity might receive, due to a change
in its state—whether the system is creating it, stopping it, resuming it, or
destroying it
• You must declare your activity in the manifest file in order for it to be accessible to
the system.
• You can start another activity by calling startActivity(), passing it an Intent that
describes the activity you want to start.

7. Service
• A Service is an application component that can perform long-running operations in
the background and does not provide a user interface.
• Once started, a service can run in the background indefinitely, even if the
component that started it is destroyed.
• A bound service offers a client-server interface that allows components to interact
with the service, send requests, get results, and even do so across processes with
interprocess communication (IPC).
• onStartCommand() and onBind()
• Like activities (and other components), you must declare all services in your
application's manifest file.

9. Content Provider
• Content providers store and retrieve data and make it accessible to all
applications. They're the only way to share data across applications; there's no
common storage area that all Android packages can access.
• How a content provider actually stores its data under the covers is up to its
designer. But all content providers implement a common interface for querying the
provider and returning results — as well as for adding, altering, and deleting data.
• Each content provider exposes a public URI (wrapped as a Uri object) that uniquely
identifies its data set. android.provider.Contacts.Phones.CONTENT_URI
• Abstract methods
– query()
– insert()
– update()
– delete()
– getType()
– onCreate()

10. Broadcast Receiver
• A broadcast receiver is a component that responds to system-wide broadcast
announcements. Many broadcasts originate from the system—for example, a
broadcast announcing that the screen has turned off, the battery is low, or a
picture was captured.
• Although broadcast receivers don't display a user interface, they may create a
status bar notification to alert the user when a broadcast event occurs.

11. Intent
• Three of the core components of an application — activities, services, and
broadcast receivers — are activated through messages, called intents.
• The intent itself, an Intent object, is a passive data structure holding an abstract
description of an operation to be performed.
• Contains
– Component Name
– Action
– Data
– Extras
– Category
– Flags

12. Practice Apps
• Hello World
• Fake Login App
• Play-Back Service

13. Ready, Steady, Code !!!

14. Rajab Davudov
Senior Developer at Azerfon
radjab@gmail.com
https://market.android.com/developer?pub=RADJAB
http://gplus.to/radjab
http://www.fb.me/rajab.davudov
http://www.linkedin.com/in/radjab
Market
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