This document provides an overview of Android application development. It describes what Android is, its architecture and core components like activities, services, and content providers. It also explains the project structure in Android Studio, including the main project folder, module for application code, and folders for java code, resources and libraries. The document also covers supporting multiple screen densities, using the Android Debug Bridge, SDK Manager, and running apps on emulators and real devices.

1. Getting Started with
Android Application
Development

2. What is Android
 It is a open source software platform and operating system for
mobile devices.
 Developed by Google and later the Open Handset Alliance (OHA)
 Allows writing managed code in the Java language.

3. Android Version History

4. Architecture

5. Android Components
 Activity
 provides a screen with which users can interact in order to do
something.
 Intents
 Intents are asynchronous message object which allow the
application to request functionality from other components of the
Android system, e.g. from Services or Activities.
 Services
 Services perform long-running operations in the background and
does not provide a user interface.

6. Android Components
 Content Providers
 A ContentProvider provides a structured interface to application data. Via a
ContentProvider your application can share data with other applications.
 App Widgets
 Widgets are miniature application views that can be embedded in other applications
(such as the Home screen) and receive periodic updates.

7. Project Components -Eclipse

8. Project Components – Android Studio
 Main Project
 .idea
 Project Module (app)
 Build
 libs
 src
 gradle
 External Libraries

9. Project Components – Android Studio
 Main Project
 This would be entire project context.
 A project is an organizational unit that represents a complete software solution.
 .idea
 storing project specific metadata.

10. Project Components – Android Studio
 Project Module (app)
 This is the actual project folder where your application code resides.
 has 3 sub directories
 Build
 complete output of the make process i.e. classes.dex, compiled classes and
resources, etc.
 libs
 hold the libraries or .jar files that needed in the project.
 src

11. Project Components – Android Studio
 src:
 have both application code and android unit test script.
 Have two folders
 androidTest
 main
 two subfolders java and res.
 The java folder contains all the java codes and res contains drawables, layouts, etc.

12. Project Components – Android Studio
 Gradle
 This is where the gradle build system’s jar wrapper. i.e. this jar is how AS
communicates with gradle installed in Windows (the OS in my case).
 External Libraries
 This is not actually a folder but a place where Referenced Libraries and
information on targeted platform SDK is shown.

13. Supporting Different Densities
 Densities
 xxhdpi: 2.5
 xhdpi:2.0
 hdpi: 1.5
 mdpi: 1.0 (baseline)
 ldpi: 0.75
 0ne approach is to work in the base standard (normal size and MDPI) and scale
it up or down for the other buckets.
 Another approach is to start with the device with the largest screen size, and
then scale down and figure out the UI compromises you'll need to make on
smaller screens.

14. Android Debug Bridge
 Used for a wide variety of developer tasks
 Read from the log file
 Show what android devices are available
 Install android applications (.apk files)

15. Android SDK Manager
 Android SDK separates tools, platforms, and other components into
packages.
 SDK Manager help you to maintain these packages.
 Add new packages.
 Update packages.
 Delete packages.

16. Run on the Emulator
 Step 1 - Create an AVD
 Step 2 - Run the app from Android Studio

17. Run on a Real Device
 Step 1 - Set up your device
 install the appropriate USB driver for your device.
 Enable USB debugging on your device.
 Enable on phone to use developer features.
 In the main apps screen select Settings -> Applications -> Development -> USB
debugging (it needs to be checked)
 Step 2 - Run the app from Android Studio

18. DEMO

19. Questions?

20. Thank you.