Mobile build (Android/iOS) in Unity - Mini Project: Build & Apply

Mobile Build Setup for Android and iOS in Unity

📖 Scenario: You are creating a simple Unity project that you want to build for both Android and iOS devices. This project will help you understand how to set up the build settings and configure platform-specific options.

🎯 Goal: Learn how to prepare a Unity project for mobile builds by setting up the initial scene, configuring build settings for Android and iOS, and finally building the project.

📋 What You'll Learn

Create a simple Unity scene with a cube

Set up build settings for Android

Set up build settings for iOS

Build the project and display the build path

💡 Why This Matters

🌍 Real World

Mobile game and app developers use Unity to create games and apps that run on Android and iOS devices. Knowing how to set up builds for these platforms is essential to publish your app.

💼 Career

Many game development and mobile app development jobs require knowledge of Unity build processes for Android and iOS platforms to deliver apps to users.

1

Create a simple Unity scene with a cube

In Unity, create a new scene and add a GameObject cube named MyCube at position (0, 0, 0). Write the C# code to create this cube in the Start() method of a script called SetupScene.

Unity

using UnityEngine;

public class SetupScene : MonoBehaviour
{
    void Start()
    {
        // Your code here
    }
}

Hint

Use GameObject.CreatePrimitive(PrimitiveType.Cube) to create a cube and set its name and position.

2

Configure build settings for Android

Add code to set the build target to BuildTarget.Android and set the Android bundle identifier to com.example.myapp using PlayerSettings.applicationIdentifier. Write this code in a new method called ConfigureAndroidBuild().

Unity

using UnityEngine;
using UnityEditor;

public class SetupScene : MonoBehaviour
{
    void Start()
    {
        GameObject MyCube = GameObject.CreatePrimitive(PrimitiveType.Cube);
        MyCube.name = "MyCube";
        MyCube.transform.position = new Vector3(0, 0, 0);
    }

    void ConfigureAndroidBuild()
    {
        // Your code here
    }
}

Hint

Use EditorUserBuildSettings.SwitchActiveBuildTarget to switch to Android and set PlayerSettings.applicationIdentifier for the bundle ID.

3

Configure build settings for iOS

Add a method called ConfigureiOSBuild() that switches the build target to BuildTarget.iOS and sets the iOS bundle identifier to com.example.myapp.ios using PlayerSettings.applicationIdentifier.

Unity

using UnityEngine;
using UnityEditor;

public class SetupScene : MonoBehaviour
{
    void Start()
    {
        GameObject MyCube = GameObject.CreatePrimitive(PrimitiveType.Cube);
        MyCube.name = "MyCube";
        MyCube.transform.position = new Vector3(0, 0, 0);
    }

    void ConfigureAndroidBuild()
    {
        EditorUserBuildSettings.SwitchActiveBuildTarget(BuildTargetGroup.Android, BuildTarget.Android);
        PlayerSettings.applicationIdentifier = "com.example.myapp";
    }

    void ConfigureiOSBuild()
    {
        // Your code here
    }
}

Hint

Use EditorUserBuildSettings.SwitchActiveBuildTarget to switch to iOS and set PlayerSettings.applicationIdentifier for the iOS bundle ID.

4

Build the project and display the build path

Write a method called BuildProject() that builds the current scene to a folder called Builds/MobileBuild and prints the build path using Debug.Log. Call this method from Start() after creating the cube.

Unity

using UnityEngine;
using UnityEditor;

public class SetupScene : MonoBehaviour
{
    void Start()
    {
        GameObject MyCube = GameObject.CreatePrimitive(PrimitiveType.Cube);
        MyCube.name = "MyCube";
        MyCube.transform.position = new Vector3(0, 0, 0);

        // Your code here
    }

    void ConfigureAndroidBuild()
    {
        EditorUserBuildSettings.SwitchActiveBuildTarget(BuildTargetGroup.Android, BuildTarget.Android);
        PlayerSettings.applicationIdentifier = "com.example.myapp";
    }

    void ConfigureiOSBuild()
    {
        EditorUserBuildSettings.SwitchActiveBuildTarget(BuildTargetGroup.iOS, BuildTarget.iOS);
        PlayerSettings.applicationIdentifier = "com.example.myapp.ios";
    }

    void BuildProject()
    {
        // Your code here
    }
}

Hint

Use BuildPipeline.BuildPlayer with the current scene path and print the build path with Debug.Log.

Practice

1. What is the main purpose of the Build Settings window in Unity when creating a mobile app?

easy

A. To write the game code for mobile devices

B. To switch the platform to Android or iOS and start the build process

C. To design the user interface of the app

D. To test the app on a desktop computer

Solution

1. Step 1: Understand Build Settings role

   The Build Settings window lets you choose the target platform like Android or iOS for your app.

2. Step 2: Recognize build initiation

   It also allows you to start building the app file for the selected platform.

3. Final Answer:

   To switch the platform to Android or iOS and start the build process -> Option B

4. Quick Check:

   Build Settings = Platform switch + build start [OK]

Hint: Build Settings = choose platform + build app [OK]

Common Mistakes:

• Confusing Build Settings with coding or UI design
• Thinking Build Settings is for testing only
• Assuming Build Settings runs the app on desktop

2. Which of the following is the correct way to switch your Unity project to Android platform?

easy

A. File > Build Settings > Select Android > Click Switch Platform

B. Edit > Preferences > Android > Enable

C. Window > Android > Activate

D. Assets > Import Package > Android

Solution

1. Step 1: Locate platform switch option

   In Unity, switching platform is done via File menu, then Build Settings window.

2. Step 2: Select Android and switch

   Inside Build Settings, you select Android and click the Switch Platform button to change.

3. Final Answer:

   File > Build Settings > Select Android > Click Switch Platform -> Option A

4. Quick Check:

   Switch platform = Build Settings > Android > Switch [OK]

Hint: Switch platform only in Build Settings window [OK]

Common Mistakes:

• Trying to switch platform in Preferences or Window menus
• Importing packages instead of switching platform
• Assuming Android is enabled by default

3. Consider this Unity C# snippet for building an Android app:

BuildPlayerOptions buildPlayerOptions = new BuildPlayerOptions();
buildPlayerOptions.scenes = new[] {"Assets/Scenes/Main.unity"};
buildPlayerOptions.locationPathName = "Builds/Android/MyGame.apk";
buildPlayerOptions.target = BuildTarget.Android;
BuildPipeline.BuildPlayer(buildPlayerOptions);

What will this code do when run inside the Unity Editor?

medium

A. Do nothing because BuildPipeline.BuildPlayer requires more parameters

B. Throw a compile error because BuildTarget.Android is invalid

C. Build an iOS app instead of Android

D. Create an Android APK file at Builds/Android/MyGame.apk including the Main scene

Solution

1. Step 1: Analyze BuildPlayerOptions setup

   The code sets scenes to include Main.unity and output path to Builds/Android/MyGame.apk targeting Android platform.

2. Step 2: Understand BuildPipeline.BuildPlayer effect

   Calling BuildPipeline.BuildPlayer with these options builds the Android APK file at the specified location.

3. Final Answer:

   Create an Android APK file at Builds/Android/MyGame.apk including the Main scene -> Option D

4. Quick Check:

   BuildPlayerOptions + BuildTarget.Android = Android APK build [OK]

Hint: BuildPipeline.BuildPlayer + BuildTarget.Android = Android APK build [OK]

Common Mistakes:

• Confusing BuildTarget.Android with iOS
• Thinking BuildPipeline.BuildPlayer needs more parameters
• Assuming code throws compile errors

4. You tried to build an iOS app but got an error: "Xcode project not found." What is the most likely cause?

medium

A. Your Unity version does not support iOS builds

B. You forgot to install Android SDK

C. You did not switch the platform to iOS in Build Settings before building

D. You did not connect an iOS device to your computer

Solution

1. Step 1: Understand iOS build requirements

   Unity requires switching platform to iOS in Build Settings to generate an Xcode project.

2. Step 2: Identify cause of missing Xcode project

   If platform is not switched, Unity won't create the Xcode project, causing the error.

3. Final Answer:

   You did not switch the platform to iOS in Build Settings before building -> Option C

4. Quick Check:

   Missing Xcode project = platform not switched to iOS [OK]

Hint: Always switch platform to iOS before building for iOS [OK]

Common Mistakes:

• Confusing Android SDK with iOS build errors
• Assuming Unity version lacks iOS support
• Thinking device connection affects project generation

5. You want to build a Unity app that works on both Android and iOS devices. Which approach is best to manage builds efficiently?

hard

A. Use Build Settings to switch platform and build each app from the same project

B. Build for Android and rename the APK file to .ipa for iOS

C. Write platform-specific code only and build once for Android

D. Maintain separate Unity projects for Android and iOS

Solution

1. Step 1: Understand Unity multi-platform support

   Unity allows building for multiple platforms from the same project by switching platform in Build Settings.

2. Step 2: Evaluate build management options

   Maintaining one project and switching platform is efficient and avoids duplicate work, unlike separate projects or incorrect file renaming.

3. Final Answer:

   Use Build Settings to switch platform and build each app from the same project -> Option A

4. Quick Check:

   One project + switch platform = efficient multi-platform build [OK]

Hint: One project, switch platform in Build Settings for each build [OK]

Common Mistakes:

• Creating separate projects wastes time and causes sync issues
• Renaming APK to IPA does not create a valid iOS app
• Building only for Android ignores iOS requirements