Android Development Android Performance Optimization

Question 1

Which tool in Android Studio provides a real-time graph of CPU, memory, network, and battery usage for a running app?

Accepted Answer

Android Profiler

Answer

Logcat

Answer

Layout Inspector

Answer

Lint

Question 2

What is the primary cause of 'jank' (dropped frames) in Android applications?

Accepted Answer

UI thread work taking longer than 16ms per frame

Answer

Excessive network calls

Answer

Too many background threads

Answer

Large APK size

Question 3

Which class should you use to run CPU-intensive work off the main thread while easily posting results back to the UI thread?

Accepted Answer

Coroutines with Dispatchers.IO

Answer

Thread

Answer

Service

Answer

AsyncTask (deprecated)

Question 4

What does the term 'memory leak' mean in Android development?

Accepted Answer

An object is kept in memory longer than its intended lifecycle

Answer

The app uses too much network bandwidth

Answer

The app writes too much data to disk

Answer

The GPU runs out of texture memory

Question 5

Which Android tool helps detect memory leaks by watching for destroyed objects that are still referenced?

Accepted Answer

LeakCanary

Answer

StrictMode

Answer

Systrace

Answer

Espresso

Question 6

What is the recommended way to load large bitmaps efficiently to avoid OutOfMemoryError in Android?

Accepted Answer

Use BitmapFactory.Options to subsample the bitmap before decoding

Answer

Load the full bitmap and then scale it in an ImageView

Answer

Convert all images to PNG format

Answer

Increase the app's heap size in the manifest

Question 7

Which mode in Android can developers enable to detect accidental disk or network access on the main thread?

Accepted Answer

StrictMode

Answer

Debug mode

Answer

ProGuard mode

Answer

ART mode