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Android Programming Basics

Introduction to Android app development using Android Studio

Android

  • Mobile operating system based on Linux kernel
  • User Interface for touch screens
  • Used on over 80% of all smartphones
  • Powers devices such as watches, TVs, and cars
  • Over 2 Million Android apps in Google Play store
  • Highly customizable for devices / by vendors
  • Open source

Android Studio + SDK

  • Official Android IDE
  • Develop, run, debug, test, and package apps
  • Monitors and performance tools
  • Virtual devices
  • Project views
  • Visual layout editor

Android App

  • One or more interactive screens
  • Written using Java Programming Language and XML
  • Uses the Android Software Development Kit (SDK)
  • Uses Android libraries and Android Application Framework
  • Executed by Android Runtime Virtual machine (ART)

Android Challenges

  • Multiple screen sizes and resolutions
  • Performance: make your apps responsive and smooth
  • Security: keep source code and user data safe
  • Compatibility: run well on older platform versions
  • Marketing: understand the market and your users (Hint: It doesn’t have to be expensive, but it can be.)

App Building Blocks

  • Resources: layouts, images, strings, colors as XML and media files
  • Components: activities, services,… and helper classes as Java code
  • Manifest: information about app for the runtime
  • Build configuration: APK versions in Gradle config files

Component Types

  • Activity is a single screen with a user interface
  • Service performs long-running tasks in background
  • Content provider manages shared set of data
  • Broadcast receiver responds to system-wide announcements

Think of Android as a Hotel:

  • Your App is the guest
  • The Android System is the hotel manager
  • Services are available when you request them (.blue[Intents])
    • In the foreground (Activities) such as registration
    • In the background (Services) such as laundry
  • Calls you when a package has arrived (Broadcast Receiver)
  • Access the city’s tour companies (Content Provider)

Building Your First App

  1. Create an Android Project
  2. Run Your App
  3. Build a Simple User Interface
  4. Start Another Activity

References

  1. Getting Started | Android Developers
  2. Dashboards | Android Developers
  3. Android Developer Fundamentals | Google Developers Training | Google Developers
  4. Introduction - Android Developer Fundamentals Course - Practicals
  5. Meet Android Studio | Android Studio
Author

Eueung Mulyana

Engineer. Lecturer. Programmer. Open Source Enthusiast.