Lead Android Developer
Lead Android Developer Interview Questions and Answers
Q1. Memory leaks in android and how to avoid them
Memory leaks in Android can occur when objects are not properly released from memory, leading to performance issues.
Avoid using static variables as they can hold references to objects longer than needed.
Be cautious with context references, as holding onto them can prevent objects from being garbage collected.
Use tools like LeakCanary to detect memory leaks and fix them before they become a problem.
Q2. how to make recyclerview more performant
To make RecyclerView more performant, optimize item layout, use view recycling, implement pagination, and prefetch data.
Optimize item layout by using ConstraintLayout for complex item views
Implement view recycling to reuse existing views instead of creating new ones
Implement pagination to load data in chunks and reduce memory usage
Prefetch data to load items in advance for smoother scrolling
Q3. strong reference vs weak reference
Strong references prevent garbage collection, while weak references allow objects to be collected if no strong references exist.
Strong references prevent the garbage collector from collecting an object as long as the reference is active.
Weak references allow the garbage collector to collect an object if there are no strong references to it.
Strong references are typically used for objects that should not be collected, while weak references are used for caching or temporary ref...read more
Q4. Broadcast Receiver in android
Broadcast Receiver is a component in Android that allows the app to receive and react to broadcast messages from other apps or the system.
Broadcast Receiver is registered in the AndroidManifest.xml file or dynamically in code.
It can listen for system-wide broadcast messages or custom broadcast messages sent within the app.
Broadcast Receiver can perform actions like starting a service, updating UI, or triggering notifications.
Example: Registering a Broadcast Receiver to listen...read more
Q5. Services in android
Services in Android are background components that perform long-running operations without a user interface.
Services run in the background even if the app is not in the foreground.
They can be used for tasks like playing music, downloading files, or syncing data.
There are two types of services: started services and bound services.
Started services are started with startService() and run independently of the app's lifecycle.
Bound services are bound to a component (e.g. Activity)...read more
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