300+ Q&As - Ace your Android Developer Test, Interview

Explore fragments as reusable UI components that create multi-pane layouts and adapt to configuration changes. Learn their lifecycles, activity communication, and common subclasses like list, dialog, and web view fragments.

Learn how Android services run long tasks in the background without a user interface, including foreground, background, bound, and started services with lifecycle callbacks like onCreate and onStartCommand.

Learn how broadcasts and broadcast receivers work, including system broadcasts and app subscriptions. Register receivers in the manifest or in code, and manage ordered, unordered, and local broadcasts with permissions.

Explore how intents act as messaging objects to request actions from other app components, including implicit, explicit, and pending types, with extras and data.

Explore Android notifications, including heads up alerts, app icon badges, notification actions, and expandable and grouped notifications, with channels and importance levels guiding user interruption.

Explain push notifications as messages from a central server to a specific user's device and how apps register with backend services to send them via FCM.

Explore how deep links and App Links open specific app content via URLs and become default handlers, and how manifest filters, App Links verification, and digital asset links establish trust.

Explore Android app data storage options, including internal and external file storage, shared preferences, and databases with Room, and learn how content providers and content resolvers enable data sharing.

Discover Android wearables and how companion apps connect to phones to process UI on the wearable, highlighting reduced resources and limited interaction versus phones.

Explore Android layout fundamentals: view and view group structure, common layouts (linear, relative, constraint, frame, grid), adapters, responsive and adaptive UI, and creating custom layout components by extending View.

Explore what app widgets are and how they appear on the home screen, providing at-a-glance information. Learn widget types—information, collection, and control—and basic provider concepts.

Explore how a recycler view recycles view objects to display datasets, boosting ui rendering speed, flexibility, and ease of implementation, and learn the roles of the view holder and adapter.

Explore how toasts provide simple feedback in a small pop up with space, and how gravity offsets position them; learn snack bars at the bottom that support actions via setAction.

Explore unit testing concepts and their role in preventing regressions and enabling continuous integration. Identify local vs instrumented tests and target 70–80 percent coverage using mosquito with Firebase Test Lab.

Examine Android design patterns like MVP, MVC, and MVVM, and learn how the view model wraps the model and provides observable data for the view.

Explore Firebase services like hosting, authentication, file storage, analytics, and cloud messaging, and learn to integrate crash reporting and AdMob with the latest library.

Explore dagger 2, a dependency injection framework for Android, covering @Inject, constructor, field, and method injections, along with @Module, @Provides, and @Component annotations.

Explore retrofit, a type-safe http client library for Android and Java, to retrieve and upload json data via rest-based web services, and learn get, post, rest architecture, and oauth.

Explore Glide, the image loading library for Android, with animated GIFs support, efficient loading and caching, and cropping and resizing transformations; compare it to Picasso and Fresco.