Mobile build (Android/iOS) in Unity - Practice Problems & Coding Challenges

Challenge - 5 Problems

❓ Predict Output

intermediate

What is the output of this Unity Android build script snippet?

Consider the following C# script snippet used in Unity to set Android build options. What will be the value of PlayerSettings.Android.minSdkVersion after running this code?

Unity

using UnityEditor;

public class BuildSettings {
    public static void ConfigureAndroid() {
        PlayerSettings.Android.minSdkVersion = AndroidSdkVersions.AndroidApiLevel24;
        PlayerSettings.Android.targetSdkVersion = AndroidSdkVersions.AndroidApiLevel30;
        PlayerSettings.Android.minSdkVersion = AndroidSdkVersions.AndroidApiLevel21;
    }
}

A AndroidApiLevel19

B AndroidApiLevel24

C AndroidApiLevel30

D AndroidApiLevel21

💡 Hint

Look at the order of assignments to minSdkVersion.

The code first sets minSdkVersion to 24, then to 21. The last assignment overrides the first, so the final value is AndroidApiLevel21.

🧠 Conceptual

intermediate

Which Unity setting controls the iOS app's display orientation?

In Unity's build settings for iOS, which setting determines whether the app runs in portrait or landscape mode?

A PlayerSettings.iOS.targetDevice

B PlayerSettings.iOS.allowedAutorotateToPortrait

C PlayerSettings.iOS.cameraUsageDescription

D PlayerSettings.iOS.buildNumber

💡 Hint

Think about orientation and autorotation.

The allowedAutorotateToPortrait boolean controls if the app supports portrait orientation on iOS.

🔧 Debug

advanced

Why does this Android build fail with a keystore error?

This Unity C# snippet is used to configure Android signing. Why will the build fail with a keystore error?

Unity

PlayerSettings.Android.keystoreName = "user.keystore";
PlayerSettings.Android.keystorePass = "password123";
PlayerSettings.Android.keyaliasName = "userkey";
PlayerSettings.Android.keyaliasPass = "wrongpass";

A The keyaliasPass is incorrect, causing a signing failure.

B The keystoreName path is missing, so Unity cannot find the keystore.

C The keystorePass is too short and invalid.

D The keyaliasName is missing, so the build cannot sign.

💡 Hint

Check if passwords match the keystore credentials.

If the keyaliasPass does not match the password for the key alias inside the keystore, the build will fail signing.

📝 Syntax

advanced

Which code snippet correctly sets the iOS build number in Unity?

Select the code snippet that correctly sets the iOS build number to "42" in Unity's PlayerSettings.

A PlayerSettings.iOS.buildNumber = "42";

B PlayerSettings.iOS.buildNumber = (int)"42";

C PlayerSettings.iOS.build = "42";

D PlayerSettings.iOS.buildNumber = 42;

💡 Hint

Check the data type of buildNumber property.

The buildNumber property is a string, so it must be assigned a string value like "42".

🚀 Application

expert

How to automate Android APK build with custom keystore using Unity Editor scripting?

You want to write a Unity Editor script that builds an Android APK and uses a custom keystore for signing. Which code snippet correctly sets the keystore and triggers the build?

A

PlayerSettings.Android.keystoreName = "mykeystore.keystore";
PlayerSettings.Android.keystorePass = "storepass";
PlayerSettings.Android.keyaliasPass = "aliaspass";
BuildPipeline.BuildPlayer(new[] {"Assets/Scenes/Main.unity"}, "Builds/MyApp.apk", BuildTarget.Android, BuildOptions.None);

B

PlayerSettings.Android.keystoreName = "mykeystore.keystore";
PlayerSettings.Android.keystorePass = "storepass";
PlayerSettings.Android.keyaliasName = "myalias";
BuildPipeline.BuildPlayer(new[] {"Assets/Scenes/Main.unity"}, "Builds/MyApp.apk", BuildTarget.Android, BuildOptions.None);

C

PlayerSettings.Android.keystoreName = "mykeystore.keystore";
PlayerSettings.Android.keystorePass = "storepass";
PlayerSettings.Android.keyaliasName = "myalias";
PlayerSettings.Android.keyaliasPass = "aliaspass";
BuildPipeline.BuildPlayer(new[] {"Assets/Scenes/Main.unity"}, "Builds/MyApp.apk", BuildTarget.Android, BuildOptions.None);

D

PlayerSettings.Android.keystoreName = "mykeystore.keystore";
PlayerSettings.Android.keyaliasName = "myalias";
PlayerSettings.Android.keyaliasPass = "aliaspass";
BuildPipeline.BuildPlayer(new[] {"Assets/Scenes/Main.unity"}, "Builds/MyApp.apk", BuildTarget.Android, BuildOptions.None);

💡 Hint

All keystore credentials must be set before building.

To sign the APK correctly, you must set keystoreName, keystorePass, keyaliasName, and keyaliasPass before calling BuildPipeline.BuildPlayer.