Complete Android Developer Docs Guide

Explore Android app fundamentals and core components, including activities, services, broadcast receivers, and content providers. Understand their lifecycles and how apps run in security sandboxes under least privilege.

Explore Android app components, including broadcast receivers and content providers, and learn how intents activate activities, services, and broadcasts using startActivity, startService, and sendBroadcast.

Discover how the manifest file powers Android apps by declaring permissions, api level, hardware features, libraries, and app components like activities, services, and receivers.

Explore how the Android manifest defines app capabilities and how explicit and implicit intents route actions like sending emails between apps, via intent filters and resolved activities.

Externalize resources such as images and strings from code, set up android device-specific resources for different configurations, and organize res, layout, values, and colors to avoid hard coding.

Explore how Android apps adapt to device configurations by leveraging language and region, locale, sim-based and layout direction, smallest width, available height, and api level 23 for proper resource selection.

Manage Android app resources by creating image aliases for different configurations, using include tags for layouts, and organizing strings and colors.

Discover how Android apps access resources via the R class, referencing resource types like drawable, layout, and string, and use resource IDs in code, views, and localization.

Explore how Android resources are organized and referenced, including style attributes, assets, and the values directory, and learn to choose appropriate layouts and locales while preventing crashes.

Explore how Android handles configuration changes such as orientation and keyboard availability. Learn to use onSaveInstanceState, bundle objects, and view model objects, or manually handle changes via onConfigurationChanged.

Explore the core topic of activities in Android, covering the activity class, the lifecycle and its callback methods, and how a mobile app launches another app to move between contexts.

An activity provides a window for the app’s user interface, hosting layouts and interactive elements like buttons to send information, while multiple activities and manifest define the launcher and navigation.

Explain explicit and implicit intents for launching activities, detailing how explicit intents target specific activities and implicit intents specify action, data, and category to open apps like an email composer.