Build navigation, parking, and charging apps for cars. Android Things. Supported hardware. Advanced setup. Build apps. Create a Things app. Communicate with wireless devices. Configure devices. Interact with peripherals. Build user-space drivers. Manage devices. Create a build. Push an update. Chrome OS devices. App architecture. Architecture Components. UI layer libraries. View binding. Data binding library. Lifecycle-aware components.
Paging Library. Paging 2. Data layer libraries. How-To Guides. Advanced Concepts. Threading in WorkManager. App entry points. App shortcuts. App navigation. Navigation component. App links. Dependency injection. Core topics. App compatibility. Interact with other apps. Package visibility. Intents and intent filters. User interface. Add motion to your layout with MotionLayout.
MotionLayout XML reference. Improving layout performance. Custom view components. Look and feel. Splash screens. Add the app bar. Control the system UI visibility. Supporting swipe-to-refresh. Pop-up messages overview. Adding search functionality. Creating backward-compatible UIs. Home channels for mobile apps. App widgets. Media app architecture. Building an audio app. Building a video app. The Google Assistant. Routing between devices. Background tasks.
Manage device awake state. Save to shared storage. Save data in a local database. Sharing simple data. View binding. Data binding library. Lifecycle-aware components. Paging Library. Paging 2. Data layer libraries. How-To Guides. Advanced Concepts. Threading in WorkManager.
App entry points. App shortcuts. App navigation. Navigation component. App links. Dependency injection. Core topics. App compatibility. Interact with other apps. Package visibility. Intents and intent filters. User interface.
Add motion to your layout with MotionLayout. MotionLayout XML reference. Improving layout performance. Custom view components. Look and feel. Splash screens. Add the app bar. Control the system UI visibility. Supporting swipe-to-refresh.
Pop-up messages overview. Adding search functionality. Creating backward-compatible UIs. Home channels for mobile apps. App widgets. Media app architecture. Building an audio app. Building a video app. The Google Assistant. Routing between devices. Background tasks. Manage device awake state. Save to shared storage. Frame Profiler UI. Customize or port game engines. Process input events. Support game controllers. Achieve proper frame pacing.
Frame pacing in Vulkan. Integrate Android Performance Tuner. Output audio. Manage memory. Use prebuilt or turnkey game engines. Develop with Defold. Develop with Godot. Develop with Unity. Use Android Performance Tuner. Game best practices. Maximize device availability. Art assets. OpenGL and Vulkan.
Game Mode. Best practices. Building effective unit tests. Automating UI tests. Testing app component integrations. Android Vitals. Optimizing for Battery Life. System tracing. Build and test apps for accessibility. Advanced topics. Protecting against security threats with SafetyNet. Build for Billions. Build for Enterprise. App feedback. Device management. Dedicated devices. Android versions. Android Developers. The system provides several options for you to save your app data: App-specific storage: Store files that are meant for your app's use only, either in dedicated directories within an internal storage volume or different dedicated directories within external storage.
Use the directories within internal storage to save sensitive information that other apps shouldn't access. Shared storage: Store files that your app intends to share with other apps, including media, documents, and other files.
Preferences: Store private, primitive data in key-value pairs. Databases: Store structured data in a private database using the Room persistence library. The characteristics of these options are summarized in the following table: Type of content Access method Permissions needed Can other apps access? Files removed on app uninstall? App-specific files Files meant for your app's use only From internal storage, getFilesDir or getCacheDir From external storage, getExternalFilesDir or getExternalCacheDir Never needed for internal storage Not needed for external storage when your app is used on devices that run Android 4.
Internal storage has limited space for app-specific data. Use other types of storage if you need to save a substantial amount of data. How reliable does data access need to be? If your app's basic functionality requires certain data, such as when your app is starting up, place the data within internal storage directory or a database.
App-specific files that are stored in external storage aren't always accessible because some devices allow users to remove a physical device that corresponds to external storage. What kind of data do you need to store? If you have data that's only meaningful for your app, use app-specific storage. For shareable media content, use shared storage so that other apps can access the content. For structured data, use either preferences for key-value data or a database for data that contains more than 2 columns.
Using touch gestures. Handling keyboard input. Supporting game controllers. Input method editors. Performing network operations. Transmit network data using Volley. Perform network operations using Cronet. Transferring data without draining the battery. Reduce network battery drain. Transfer data using Sync Adapters.
Bluetooth Low Energy. Wi-Fi infrastructure. Discover and connect. Runtime API reference. Web-based content. Android App Bundles. Google Play. Play Asset Delivery. Play Feature Delivery. In-app reviews. In-app updates. Google Play Instant. Get started with instant apps. Get started with instant games. Integrate with Firebase. Play Install Referrer.
Play Install Referrer Library. Application Licensing. Android GPU Inspector. System profiling. Analyze a system profile. GPU performance counters. Frame profiling. Analyze a frame profile. Frame Profiler UI. Customize or port game engines. Process input events.
Support game controllers. Achieve proper frame pacing. Frame pacing in Vulkan. Integrate Android Performance Tuner. Output audio. Manage memory. Use prebuilt or turnkey game engines. Develop with Defold. Develop with Godot. Develop with Unity.
Use Android Performance Tuner. Game best practices. Maximize device availability. Art assets. OpenGL and Vulkan. Game Mode. Best practices. Building effective unit tests.
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