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Android OS & SDK - Getting Started
The document provides an overview of the Android operating system and software development kit, detailing its architecture, application building blocks, and the development process for Android apps. It explains the components such as activities, intents, and services, alongside instructions for setting up the development environment and running an application. Additionally, it highlights career opportunities in Android development, including salary trends and future growth potential.
In this document
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Overview of Android as an open-source platform, its acquisition by Google, and its architecture.
List of diverse Android powered devices ranging from smartphones and tablets to smart TVs and robots.
Detailed breakdown of Android architecture including applications, libraries, runtime, and Linux kernel.
Core components: Activities, Intents, Services, and Content Providers that facilitate Android app functionality.
Introduction to the Android SDK, app lifecycle, and step-by-step guide to starting app development.
Basic coding for an Android app that displays a message upon button click.
Instructions for setting up an emulator and running the developed Android application.
Step-by-step guide on publishing apps to Google Play Store including fees and uploading process.
Career prospects in Android development, salary growth statistics, and future demand for developers.
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Android OS & SDK - Getting Started
- 1. Operating System &Software Development Kit
- 2. Overview • Introduction toAndroid • Architecture of Android • Application Building Blocks • Developing Android App • Career Opportunities
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- 4. Introduction to Android •Open Source Software Platform for Mobile Application Development • An Open Handset Alliance Project, acquired by Google, Inc. in 2005 • A Complete Stack – Operating System + Middleware + Applications • Powered by Linux Operating System • Developed using C/C++ , provide development using Java
- 5. Android Powered Devices •Smart Phones • Tablets • Washing Machine • Coffeemaker (“Appresso”) • Watch • Android Powered Microwave (MAID) • Camera (Coolpix S800c) • Gaming Console • E-Bike (concept by Ford Motor Co.) • Android Powered Headrest • Ninja Robot (boxing robot) • Android Powered Refrigerator • Smart TV & Pocket TV • Chevrolet Volt integrated with Android
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- 7. Architecture of Android Applications ApplicationFramework Libraries Android Runtime Linux Kernel Android Runtime Libraries Linux Kernel • Dalvik Virtual machine Application Framework Applications C/C++ Libraries • Work asfile (Hardware Abstraction Layer) • .dex HAL • API Interface application Built in and User Interface through Java • Device Drivers Efficient • Compact and • Activity manager.apk files Can install using • Limited memory & Power Handling User Interface • memory management • Content ->Phone-> .jar ->WeChat, Web Browser, Providers Example: .class Dialer, .dex • .java • 2D/3DAndroid or others Graphics Process Management Hello • Location Manager etc • Core LibrariesBrowser Engine, SQLite Media Acces, Networking • Java Standard Edition
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- 9. Application Building Blocks •Activity • Intents • Service • Content Providers
- 10. Activities • Corresponds toone UI Screen • But they can be – faceless, floating window, return a value
- 11. Intents • Think intentas an object or description what you want DONE! • Example- view, call, play etc. • System matches intent with activity that can best provide the service • Activities and IntentRecievers describe what intent can service Activity 1 Intent (says : I want to do this) Activity 2
- 12. Services • Components thatrun in a background • Music player, download etc.
- 13. Content Providers App 2 App1 • Sharing of data across applications • Address book, photo gallery • Provide uniform API for: Content Provider (eg. address book) • Query • Delete, update & insert App 3 App 4
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- 15. Android Software DevelopmentKit (SDK) • Java SDK (at least Java SDK 5) • Android SDK (http://developer.android.com/sdk/index.html)
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- 17. Android Software DevelopmentKit (SDK) • Install the Java and set CLASSPATH and PATH • Unzip the downloaded Android SDK, and run Eclipse (run as admin)
- 18. Android Application LifeCycle onCreate() onStart() Starting onRestart() onStart() onResume() Running onResume() onSaveInstanceState() onPause() Paused Stopped onSaveInstanceState() onStop() onDestroy() Destroyed onDestroy()
- 19. What’s inside anApp ? Default Activity Libraries Other Default Default Activities Activity Activity Service Content Android Manifest Drawable Layouts Values Assets
- 20. Android SDK Manager Usingthis tool, we can download the required APIs & Libraries, for application.
- 21. Let’s start developing • • • • StartEclipse (ADT) File -> new -> project Select Android Application Project Click next
- 22. • Enter ApplicationName • HelloAndroid • Enter Project Name • HelloAndroid • Enter Package Name • com.example.helloandroid • Minimum Required SDK • API 10 • Target SDK : API 10 • Compile With: API 10 • Theme : none
- 23. Let’s start developing •Choose all other options as default. • Click next -> next -> next -> finish….. • Now we are ready to Code and Develop
- 24. Let’s start developing •MainActivity.java : for back-end programming • Activity_main.xml : for designing layout (UI) • Double Click the activity_main.xml • Eclipse will show its • Graphical layout : for drag-n-drop design • Activity_main.xml : for code based design
- 26. Let’s start developing •In this application, we want to bind an event to that button • Whenever user click (or touch) that button, the text box must display “Hello Android” • We have designed our UI, and now its time for code in java.
- 27. Let’s start developing packagecom.example.helloandroid; import android.os.Bundle; import android.app.Activity; import android.view.Menu; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText;
- 28. public class MainActivityextends Activity implements OnClickListener { private EditText txt; private Button btn; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); txt = (EditText) findViewById(R.id.editText1); btn = (Button) findViewById(R.id.button1); btn.setOnClickListener(this); } public void onClick(View v) { txt.setText("Hello Android"); } }
- 29. Running the Application •We need to set an emulator to test on PC. • In eclipse, click Android Virtual device Manager icon. • It will popup a dialog box, that you can use to create your emulator. • In that dialog box, click new button to add an emulator.
- 31. Wowww!! We havedone it! Now its ready to launch Press Ctrl + F11 to Run
- 33. Congratulations! You create yourvery first App! Now, its time to publish it to the world
- 34. Publishing Android Appon Google Play Store • https://play.google.com/apps/publish/signup/ • $25 (Rs. 1600 – 1700) one time fee, pay via Google Wallet
- 36. Upload APK file •Find .apk of your project in bin folder of your workspace • Upload it using Screen Instructions • Manage Pricing & Distribution • Manage Store Listing • Available for end-user, anywhere in the world
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- 38. Career in AndroidDevelopment • Salary • Highest Salary Increases – 9% from 2012-2013 • 2012 : $85,000 - $1,22,500 , 2013 : $92,750 $1,33,500 (networkworld.com survey) • Future Scope & Growth • The more devices, the more software required, the more developer required • Get experience in Java & programming, help you to switch if you needed
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