Remote Config in Android Kotlin - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ ui_behavior

intermediate

How does Remote Config update UI values?

You have a TextView showing a welcome message. After fetching Remote Config values, which code snippet correctly updates the TextView with the new value?

Android Kotlin

val welcomeMessage = remoteConfig.getString("welcome_message")
// Update TextView here

A textView.setText(welcomeMessage.toInt())

B textView.text = welcomeMessage

C textView.text = remoteConfig.getBoolean("welcome_message").toString()

D textView.text = null

💡 Hint

Remember, Remote Config values are strings and TextView.text expects a string.

Remote Config values are retrieved as strings. To update a TextView, assign the string value directly to textView.text.

❓ lifecycle

intermediate

When should you fetch Remote Config values?

In an Android app, when is the best time to fetch Remote Config values to ensure the app shows the latest configuration without delaying startup?

A Fetch Remote Config values in a background thread after initial UI is shown

B Fetch Remote Config values in onResume() and update UI after fetch completes

C Fetch Remote Config values only when the user clicks a refresh button

D Fetch Remote Config values in onCreate() and apply them immediately before showing UI

💡 Hint

Think about user experience and app responsiveness.

Fetching Remote Config in the background after UI shows avoids delaying app startup and allows updating UI when new values arrive.

🔧 Debug

advanced

Why does Remote Config fetch fail with a timeout?

You notice Remote Config fetch calls fail with a timeout error on some devices. What is the most likely cause?

A App is running in debug mode

B Remote Config keys are misspelled in the app code

C Remote Config values are not set in the Firebase console

D Device has no internet connection or poor network quality

💡 Hint

Timeout errors usually relate to network issues.

Timeout errors happen when the device cannot reach the Remote Config server due to no or poor internet connection.

🧠 Conceptual

advanced

What is the purpose of default Remote Config values?

Why should you set default values for Remote Config parameters in your app?

A To ensure the app has safe fallback values when Remote Config fetch fails

B To speed up Remote Config fetch calls

C To prevent the app from compiling without Remote Config keys

D To disable Remote Config features in production

💡 Hint

Think about what happens if the app cannot get values from the server.

Default values provide fallback settings so the app behaves predictably even if fetching Remote Config fails.

❓ navigation

expert

How to trigger navigation change based on Remote Config?

You want to navigate to a special promotion screen only if Remote Config parameter "show_promo" is true. Which code snippet correctly performs this navigation in an Android app using Kotlin?

Android Kotlin

val showPromo = remoteConfig.getBoolean("show_promo")
// Navigate if showPromo is true

A if (showPromo == "true") { startActivity(Intent(this, PromoActivity::class.java)) }

B if (showPromo.equals(true)) { startActivity(Intent(this, PromoActivity::class.java)) }

C if (showPromo) { startActivity(Intent(this, PromoActivity::class.java)) }

D if (showPromo != null) { startActivity(Intent(this, PromoActivity::class.java)) }

💡 Hint

Remember the type returned by getBoolean and how to check it.

getBoolean returns a Boolean, so a simple if (showPromo) check is correct. Comparing to string or using equals is incorrect.