Android Development Android Performance Optimization 2

Question 1

What is the purpose of the RecyclerView.RecycledViewPool in Android?

Accepted Answer

To share recycled ViewHolders across multiple RecyclerViews

Answer

To cache network responses for list items

Answer

To limit the number of views that can be inflated

Answer

To persist scroll position across configuration changes

Question 2

What does 'overdraw' mean in the context of Android rendering performance?

Accepted Answer

A pixel being painted more than once per frame

Answer

Drawing too many items in a RecyclerView

Answer

Allocating too many objects in a tight loop

Answer

Exceeding the maximum texture size on the GPU

Question 3

Which Android feature allows deferring the inflation of part of a layout until it is actually needed, improving initial load time?

Accepted Answer

ViewStub

Answer

ConstraintLayout chains

Answer

Data Binding

Answer

MotionLayout

Question 4

What is the main benefit of using ConstraintLayout over nested LinearLayouts or RelativeLayouts?

Accepted Answer

It flattens the view hierarchy, reducing measure/layout passes

Answer

It supports hardware acceleration by default

Answer

It automatically caches view positions

Answer

It removes the need for ViewHolders in RecyclerView

Question 5

When using Room database, what should you avoid doing on the main thread to prevent ANR errors?

Accepted Answer

Running database queries synchronously

Answer

Defining DAO interfaces

Answer

Annotating entity classes

Answer

Using LiveData return types

Question 6

What is 'baseline profiles' in Android, and what is their primary benefit?

Accepted Answer

Pre-compiled bytecode rules that speed up app startup and frame rendering

Answer

A set of user permissions required at install time

Answer

Memory allocation profiles stored per-user

Answer

GPU shader caches bundled with the APK

Question 7

Which Jetpack library provides built-in support for pagination, loading large data sets from a data source in chunks to improve performance?

Accepted Answer

Paging 3

Answer

WorkManager

Answer

DataStore

Answer

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