Android apps are built as a combination of components that can be invoked individually. For example, an activity is a type of app component that provides a user interface UI. The "main" activity starts when the user taps your app's icon. You can also direct the user to an activity from elsewhere, such as from a notification or even from a different app. Other components, such as broadcast receivers and services , allow your app to perform background tasks without a UI.
After you build your first app, you can learn more about the other app components at Application fundamentals. Android allows you to provide different resources for different devices.
For example, you can create different layouts for different screen sizes. The system determines which layout to use based on the screen size of the current device. If any of your app's features need specific hardware, such as a camera, you can query at runtime whether the device has that hardware or not, and then disable the corresponding features if it doesn't.
You can specify that your app requires certain hardware so that Google Play won't allow the app to be installed on devices without them. After you build your first app, learn more about device configurations at Device compatibility overview. Content and code samples on this page are subject to the licenses described in the Content License.
App Basics. Build your first app. App resources. Resource types.
- Top 5 Courses to Learn Android for Java Programmers.
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App manifest file. App permissions. Device compatibility. Multiple APK support. Adding wearable features to notifications. Creating wearable apps. Creating custom UIs. Sending and syncing data. Creating data providers. Creating watch faces. Android TV.
50+ Free Resources to Ace at Android Development
Build TV Apps. Build TV playback apps. Help users find content on TV.
Recommend TV content. Build TV channels. Android for Cars. Android Things.
Developer kits. Advanced setup. Build apps. Create a Things app.
Android Development | edX
Communicate with wireless devices. Configure devices. Interact with peripherals. Build user-space drivers. Manage devices. Create a build. An Introduction to Video: Concepts and Optimization.
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An Introduction to Audio: Concepts and Optimization. Android Intents: Inter-Application Programming. Android Services: Using Background Processing. Android Content Providers: Access to Datastores. Back Matter Pages You'll also learn best practices that ensure your code will be efficient and perform well. Get an accelerated but complete enough treatment of the fundamentals of Java necessary to get you started. The code in this app is quite simple, which makes it easier if you're learning a new language.
By examining the code from this project you can also learn how to make custom desktop widgets for Android. Github Play Store Difficulty: Intermediate. But don't follow the coding standards used in this project.
Developing Android Apps
If you want to learn about audio recording and manipulation in Android, then this simple, easy-to-use, high-quality sound recorder app is the best way to start your journey. Sounds simple, right? It actually is! Github Difficulty: Intermediate. The app itself is quite simple, but the way in which the developers implemented things is fantastic, and definitely worth a look.
Step 1: Download Android Studio
This simple, light-weight, minimalist file manager is designed to run on both phones and tablets. There are lots of things you can learn from this project about file handling, root management, loaders, custom views, and so on. If you are a beginner, this very simple, yet cool to do project is a great way to get started. Read the code and you'll learn most of the fundamental aspects of Android development. The app is well designed, and serves as a good starting point for any beginner.
Github Play Store Difficulty: Advanced.
Training for Android and web developers
Timber is a beautifully designed, fully featured music player for Android. If you ever wanted to build your own music player or music-related app, this is the app for you. If you want to learn about monitoring Android processes, memory usage, CPU usage, and other related subjects, then this is the perfect project.