Android-Interview-Questions

东郭存

2023-12-01

Android Interview Questions

Collaboration Rules

Make sure your question is new and unique - not just rephrasing a previously existing question. If possible, include a link to the solution/topic. Questions should be fairly straightforward and completely technical (no "how many golf balls are in America" questions.) If there is a new topic that you think should be included, then include it!

Topics:

General Developer Questions

How familiar you are with the Android and Google Guidelines?
Describe Test-Driven Development. [info]
Explain unit tests versus functional tests.
Describe Scrum and Kanban.
What project management tools have you used?
How do you ensure that you are working efficiently?
Do you have basic familiarity with working on the command line i.e. Gradle, Ant, or the Java Compiler?

Core Java

Object-Oriented Programming

Explain object serialization and how to implement it in Java.
Explain anonymous classes. [info]
Describe the differences between abstract classes and interfaces. [info]
Explain what a Singleton class is and how to create one in Java [info]
Why should the equals() and hashCode() methods often be overridden together? [info]
How do you properly override the equals() method? For example, what considerations should be taken when checking for equality? [info]

Data Structures

What are the use cases and differences of arrays and ArrayLists?
What are the use cases and differences of a HashSet and a TreeSet?

Build Tools

Have you used any Ant, Maven, Gradle features for your project?

Programming Paradigms

Explain event-driven programming in Java [info]
What is Java's Garbage Collection and how does it help you as a developer?
How can you typecast in Java? [info]
Explain Java's try-catch-finally paradigm [info]

Core Android

How does the Android notification system work?
How can two distinct Android apps interact? (several answers)
Describe Activities. [info]
What are the four states of the Activity Lifecycle? [active/running, paused, stopped, destroyed]
What are the seven callback methods of an Activity used to perform operations when the Activity transitions between states? [onCreate(), onStart(), onResume(), onPause(), onStop(), onRestart(), onDestroy()]
What is the difference between a fragment and an activity? Explain the relationship between the two.
What is the difference between Serializable and Parcelable? Which is the best approach in Android?
What are "launch modes"?
What are Intents? [info]
What is an Implicit Intent? [info]
What is an Explicit Intent? [info]
Describe three common use cases for using an Intent.
What is a Service? [info]
What is a ContentProvider and what is it typically used for? [info]
What is a Fragment? [info]
What is ADB?
What is ANR?
What is AndroidManifest.xml used for? Give examples of what kind of data you would add to it.[info]
Describe how broadcasts and intents work to be able to pass messages around your app.[info]
What is the Dalvik Virtual Machine?

Android Design and XML

Explain the differences and similarities of Relative Layout and Linear Layout.
Explain the differences and similarities of List Views and Grid Views.
Describe how to implement XML namespaces.
Explain how to present different styles/drawables for a button depending on the state of the button (pressed, selected, etc.) using XML (no Java) [info]
for layout_width and layout_height, what's the difference between match_parent and wrap_content?
How do you implement Google's new Material Design in an Android application? [info]

Android Networking

Have you use an HTTP Library, which, why, did you like it?
Describe how REST APIs work.
What are some typical methods of HTTP request/responses? [GET, POST, PUT, PATCH, DELETE, UPDATE]

Databases

Why does Android use SQLite?
What libraries have you used for interacting with databases and why did you choose them?
What are contract classes? [info]
How do you use the BaseColumns interface to describe your data schema? [info]