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Welcome to the open-source CodePath Android Cliffnotes! Our goal is to become the central crowdsourced resource for complete and up-to-date practical Android developer guides for any topic. Just take me to the notes!
We have Android guides for everyone whether you are a beginner, intermediate or expert. Want to learn how to use the ActionBar or the ins and outs of fragments? We got that. Want to learn about automated unit testing or how to build flexible user interfaces for multiple devices? We got you covered. We don't waste time with the "theoretical approach" you might get from a book. We cover exactly the things we use every day as we are developing apps for contracts.
Need Help? Please join this gitter real-time chat or the google groups for these guides where you can post related questions. You can also get 1:1 mentorship online through codementor.
Ever been frustrated finding information on outdated one-off blog posts and tutorials that have long since become irrelevant? How many times have you been googling to find your answer only exists on an obscure 2 year old StackOverflow post? We believe there's got to be a better way. Why not have the community work together to create useful and detailed documentation for every aspect of Android (or any platform)? There's absolutely no reason that we should have to make do with vague and outdated content anymore.
Read about our mission to change the way engineers learn new technologies and check out how you can get involved! In addition, we are at present a fledgling startup so if you like this guide and what we are trying to do, please consider following us on twitter @codepath!
The cliffnotes below are categorized by their topic, so you can easily find guides on related topics whether that is views, styling, testing, or using sensors. If you see an error, incorrect explanation or deprecated solution, why not contribute back and make these cliffnotes better for the next person? That in a nutshell is the core spirit of this initiative. Check out the list of contributors to this project.
Disclaimer: We have scoured the web endlessly for content while creating these guides and adapted content from many source including the Google Official Docs, Vogella Tutorials and countless other sources that had hidden gems of information. At the bottom of each guide, there are citations for the content we used. We don't claim the content is original (although we did develop quite a bit ourselves), but unlike those other sources listed, it is freely community editable. We have openly adapted, modified and brought together this content from all the sources we could find for the benefit of every engineer.
Read more about us and our vision for CodePath. If you want to contribute to this guide, please read the Contributing Guidelines.
Totally new to Android? Start here.
- Getting Started as a Developer (New to programming?)
- Getting Started with Android (Detailed Post With Many Links)
- Setting up Android Studio (Installation Slides) or Setting up IntelliJ IDEA
- Running Apps on Your Device (Hardware device setup)
- Developing our First App Using Android Studio (Step-by-Step Todo App)
- Architecture of Mobile Apps (Concept Slides)
- Mobile Screen Archetypes (Common mobile app screen categories)
- Todo App Guide (Todo App steps in guide format)
- Sample Android Apps (Code repositories)
- Keeping Updated with Android (Podcasts, blogs, newsletters)
- Effective Java for Android (Java best practices)
- Using Kotlin for Android development (Alternative syntax to Java)
Debugging Android. Debug and troubleshoot issues.
- Debugging Exceptions within your App (App crashing?)
- Debugging Android App Slides
- Troubleshooting Common Issues (Running into problems?)
- Troubleshooting API Calls (how to inspect network traffic)
External Resources. Great external content to explore.
- Android Resources List
- Ultimate Android Reference
- Android Tips and Tricks Repo
- Google Android Interactive Codelabs
- Google Android Glossary (Defining Common Terms)
- Android Resources Aggregated
- Android Learning Resources
- Awesome Android Complete Reference
- Free Android Curriculum (Additional Android resources and slides)
- Notate: Annotated YouTube Lectures
Exploring the core of app development:
- Using Context (What is context and how is it used?)
- Android Directory Structure (Files and Folders for Android apps)
- Organizing your Source Files (Cleaning up source of your apps)
- Architecture of Android Apps (Understanding how apps should be structured)
- Understanding App Resources (Understanding Strings and Resources)
- Understanding the Activity Lifecycle (How does an activity work?)
- Handling Configuration Changes (Screen Rotation)
- Migrating to the AppCompat Library (Using the Support Libraries)
- App Permissions (How to request the permissions you need)
- Managing Runtime Permissions with PermissionsDispatcher
- Replacing Enums with Enumerated Annotations (StringDef, IntDef for validated types)
- Understanding the Android Application Class (Custom application object)
Exploring the gritty details of views, layout, styling and common UI patterns:
- Constructing View Layouts (How to layout views)
- Defining Views and their Attributes (Gravity, Margin, Padding, etc)
- Working with the TextView (Properties, Drawables, Custom Fonts)
- Working with the EditText (Properties)
- Working with the ImageView (Drawables, Size and Scale, Density, Raw Bitmaps)
- Working with Input Views (Spinner, RatingBar, etc)
- Working with the Soft Keyboard
- Working with the WebView
- Working with the ScrollView
- Reducing View Boilerplate with ViewBinding
- Applying Data Binding for Views (Data binding library)
- Drawables (and how to polish UI views)
- Styles and Themes (Consolidating view styles)
- Animations (Animating views, layouts, activities and more)
- Polishing a UI Tips and Tools (Links to key resources)
- Android Design Guidelines (Overview of Android design standards)
- Styling UI Screens FAQ (Answers to common questions around building screens)
- Cloning a Login Screen Layout Guide (Creating attractive UIs, Q&A)
- Developing Custom Themes (Integrating drawables, styles and themes)
- Material Design Primer (Lollipop Design Overview)
- Dynamic Color using Palettes (Adaptive colors, Android 5.0)
- Ripple Animation (Android 5.0)
- Shared Element Activity Transition (Android 5.0)
- Circular Reveal Animation (Android 5.0)
- Design Support Library (Material Design Library)
- View Hierarchy Animations (Android 4.0)
- Chrome Custom Tabs
- Using an ArrayAdapter with ListView (with custom list items)
- Paging Library Guide (Infinite pagination)
- Endless Scrolling with AdapterViews and RecyclerView (Infinite pagination)
- Implementing Pull to Refresh Guide
- Implementing a Horizontal ListView Guide (Scrolls horizontally)
- Implementing a Heterogenous ListView (with different item types)
- Using the RecyclerView (Android 5.0)
- Heterogeneous Layouts inside RecyclerView (Android 5.0)
- Using the CardView (Android 5.0)
- Using a BaseAdapter with ListView (alternate to ArrayAdapter)
- Basic Painting with Views (Simple drawing app tutorial)
- Defining Custom Views (Needs Attention)
- Extending SurfaceView (Needs Attention)
- Drawing with OpenGL and GLSurfaceView (Needs Attention)
- Building a Custom Animated Progress Bar (Exercise)
Exploring how to allow user interaction and navigation within an app:
- View Event Listeners (Clicks, Key Presses, Updates)
- Creating Custom Listeners (Defining, setting and triggering events)
- Displaying Toasts (Quick notices and includes custom views)
- Displaying the Snackbar (Quick notices with actions)
- Exploring the ActionBar (Includes adding ActionItems)
- Extended ActionBar Guide (Split-bar, Custom ActionBar, etc)
- Gestures and Touch Events (Swipe, Shake, or Dragging Events)
- Menus and Popups (Context Menu, PopupMenu, PopupWindow)
- Dialogs with DialogFragment (Displaying a content overlay)
- Implementing a Rate Me Feature (For getting Play Store ratings)
- Repeating Periodic Tasks (Handler, ScheduledThreadPoolExecutor)
- Using the App Toolbar (ActionBar Replacement)
- Floating Action Buttons (Android 5.0, Promoted Action)
- Handling Scrolls with CoordinatorLayout (Collapsing toolbars)
- Navigating Activities with Intents (Communicating between Activities)
- Common Navigation Paradigms (Tabs, Swipe-able Views, Pull-out Drawer)
- Common Implicit Intents (Making a Call, Sending a Text, Opening a URL)
- Navigation and Task Stacks (Controlling the behavior of the task stack)
- Sharing Content with Intents (and ShareActionProvider)
- Using Parcelable (Pass data fast between activities)
- Book Search Tutorial (Toolbar with SearchView and sharing content)
Diving into the networking and model layers for data-driven apps:
- Sending and Managing Network Requests (API Calls, Image Downloading)
- Displaying Images with the Glide Library (Remote Image Downloading)
- Displaying Images with the Picasso Library (Remote Image Downloading)
- Converting JSON to Models (JSON to Objects Deserialization)
- Leveraging the Gson Library (JSON deserialization library)
- Creating and Executing Async Tasks (Long-running Background Tasks)
- Handling ProgressBars (with Long-Running Tasks)
- Rotten Tomatoes Networking Tutorial
- Networking with the Volley Library
- Networking with the OkHttp Library
- Networking with the Fast Android Networking Library
- Consuming APIs with Retrofit
- Displaying Images with the Fresco Library
- Building Data-driven Apps with Parse
- Configuring a Parse Server
- Building Simple Chat Client with Parse
- Troubleshooting Common Issues with Parse
- Sending and Receiving Data with Sockets
- Building Data driven Apps with Firebase
Exploring the strategies for data persistence:
- Persisting Data to the Device (Preferences, Files, SQLite, ORMs)
- Room ORM Guide
- ActiveAndroid ORM Guide (and Q&A)
- Storing and Accessing SharedPreferences
- Local Databases with SQLiteOpenHelper
- Populating a ListView with a CursorAdapter
- Settings with PreferenceFragment
- Loading Contacts with Content Providers (CursorLoader, LoaderManager)
- Interacting with the Calendar (CalendarProvider)
- Creating Content Providers
- Clean Persistence with Sugar ORM (Installation, Queries, Migrations)
- DBFlow ORM Guide (Installation, Queries)
- Easier SQL with Cupboard
- Powerful Persistence with JDXA ORM
- Storing Secret Keys in Android (API keys, credentials)
- Working with the ImageView (Drawables, Size and Scale, Density, Raw Bitmaps)
- Drawables (and how to polish UI views)
- Displaying Images with the Glide Library
- Displaying Images with the Picasso Library
- Displaying Images with the Fresco Library
Understanding how to build powerful and flexible views using Fragments:
- Creating and Using Fragments
- Displaying a DialogFragment
- Google Play Style Tabs using TabLayout
- Sliding Tabs with PagerSlidingTabStrip
- ViewPager with FragmentPagerAdapter
- Fragment Navigation Drawer
- Flexible User Interfaces (with Fragments)
- ActionBar Tabs with Fragments (Deprecated)
Exploring sensors and components available via the Android SDK:
- Accessing the Camera and Stored Media (Camera, Photo Roll)
- Retrieving Location with LocationServices API (Location)
- Listening to Sensors using SensorManager (Light, Accelerometer)
- Audio Playback and Recording (MediaPlayer)
- Video Playback and Recording (VideoView)
- Google Maps Setup Guide (and Setup Genymotion)
- Google Maps API v2 Usage (Markers, InfoWindow)
- Connectivity using the Bluetooth API (Needs Attention)
- Streaming Youtube Videos with YouTubePlayerView
- Playing Media with ExoPlayer or TubiPlayer
Digging into how to run background services or leverage Android system services:
- Starting Background Services (with JobScheduler, JobIntentService and Receivers)
- Notifications (Persistent Notices on the Dashboard)
- Push Messaging (Parse Push and Broadcast Receiver Overview)
- Google Cloud Messaging (Detailed GCM Implementation)
- Real-time Messaging (Needs Attention)
- Managing Threads and Custom Services (Looper, Handler, ThreadPoolExecutor)
- Server Synchronization (SyncAdapter)
Covering automated testing frameworks and tools for Android:
- Android Testing Options
- Unit Testing with Robolectric
- UI Testing with Espresso
- UI Testing with Robotium (Needs Attention)
- Android Testing Framework (Needs Attention)
Covers usage of more advanced third-party libraries and SDKs that save time and improve the maintainability of your code:
- Must Have Libraries (Networking, Persistence, Compatibility, Convenience, etc)
- Popular External Tools (Analytics, Crash Reporting)
- Dependency Injection with Dagger 2
- Reducing View Boilerplate with Butterknife (View Annotations)
- Communicating with an Event Bus (Using EventBus to publish and receive events)
- Using Parceler (Creating Parcelable objects)
- RxJava Intro (Intro to Reactive programming)
- RxJava and RxBinding (Reactive programming with Android views)
Covers guides specifically related to developing and publishing robust Android applications:
- Publishing to the Play Store (Slides)
- Publishing with Android Studio
- Debugging and Profiling Apps (Needs Attention)
- Android Best Practices
- Creating App Shortcuts in Launcher (Needs Attention)
Focused on issues like deployment, dependency management, etc:
- Getting Started with Gradle
- Using Android Studio
- Installing Android SDK Tools
- Building Gradle Projects with Jenkins CI
- Setting up Travis CI
- Collaborating on Projects with Git (Git, Team)
- Presenting an Android Device (Cast Device to Laptop)
- Recording Video of an Android Device
- Configuring ProGuard
- Lambda Expressions (Retrolambda and Java 8)
- Android for Work (Deploying Android to the Enterprise)