Platform-specific settings in Unity - Mini Project: Build & Apply

Platform-specific Settings in Unity

📖 Scenario: You are creating a simple Unity game that behaves differently on Windows and Android platforms. You want to set up platform-specific settings to show a message depending on the platform the game is running on.

🎯 Goal: Build a Unity script that detects the platform at runtime and displays a message specific to Windows or Android.

📋 What You'll Learn

Create a C# script with a string variable for the message

Add a platform check variable

Use an if-else statement to set the message based on platform

Print the message to the Unity Console

💡 Why This Matters

🌍 Real World

Games and apps often need to behave differently on various platforms like Windows, Android, or iOS. Detecting the platform helps customize user experience.

💼 Career

Understanding platform-specific settings is important for Unity developers to create cross-platform games and apps that run smoothly on different devices.

1

Create a string variable for the message

Create a public string variable called platformMessage inside a new C# class called PlatformSettings.

Unity

using UnityEngine;

public class PlatformSettings : MonoBehaviour
{
    // Create a public string variable called platformMessage
    // Your code here
}

Hint

Use public string platformMessage; inside the class.

2

Add a platform check variable

Inside the PlatformSettings class, create a private variable called isWindows of type bool and set it to Application.platform == RuntimePlatform.WindowsPlayer.

Unity

using UnityEngine;

public class PlatformSettings : MonoBehaviour
{
    public string platformMessage;

    // Create a private bool variable called isWindows and set it to Application.platform == RuntimePlatform.WindowsPlayer
    // Your code here
}

Hint

Use private bool isWindows = Application.platform == RuntimePlatform.WindowsPlayer;

3

Set the message based on platform

Inside the Start() method of PlatformSettings, use an if statement with isWindows to set platformMessage to "Running on Windows". Use else to set platformMessage to "Running on Android".

Unity

using UnityEngine;

public class PlatformSettings : MonoBehaviour
{
    public string platformMessage;

    private bool isWindows = Application.platform == RuntimePlatform.WindowsPlayer;

    void Start()
    {
        // Use if-else to set platformMessage based on isWindows
        // Your code here
    }
}

Hint

Use if (isWindows) { platformMessage = "Running on Windows"; } else { platformMessage = "Running on Android"; } inside Start().

4

Print the platform message

Inside the Start() method, after setting platformMessage, add a line to print it to the Unity Console using Debug.Log(platformMessage);.

Unity

using UnityEngine;

public class PlatformSettings : MonoBehaviour
{
    public string platformMessage;

    private bool isWindows = Application.platform == RuntimePlatform.WindowsPlayer;

    void Start()
    {
        if (isWindows)
        {
            platformMessage = "Running on Windows";
        }
        else
        {
            platformMessage = "Running on Android";
        }
        // Print platformMessage to the console
        // Your code here
    }
}

Hint

Use Debug.Log(platformMessage); to print the message.

Practice

1. What is the main purpose of using platform-specific settings in Unity?

easy

A. To disable all graphics features

B. To increase the game's file size

C. To make the game work well on different devices

D. To make the game run only on Windows

Solution

1. Step 1: Understand platform-specific settings

   Platform-specific settings allow customizing game behavior for different devices.

2. Step 2: Identify the main goal

   The goal is to ensure the game works well on all targeted platforms.

3. Final Answer:

   To make the game work well on different devices -> Option C

4. Quick Check:

   Platform-specific settings = device compatibility [OK]

Hint: Think about device compatibility and performance [OK]

Common Mistakes:

• Confusing platform-specific settings with increasing file size
• Assuming settings limit the game to one platform
• Believing settings disable features globally

2. Which of the following is the correct way to write platform-specific code for Android in Unity?

easy

A. #if UNITY_ANDROID
// Android code
#endif

B. #if ANDROID
// Android code
#endif

C. #if PLATFORM_ANDROID
// Android code
#endif

D. #if UNITY_MOBILE
// Android code
#endif

Solution

1. Step 1: Recall Unity platform symbols

   Unity uses symbols like UNITY_ANDROID for Android platform checks.

2. Step 2: Match the correct syntax

   #if UNITY_ANDROID is the correct directive for Android-specific code.

3. Final Answer:

   #if UNITY_ANDROID // Android code #endif -> Option A

4. Quick Check:

   Use UNITY_ANDROID for Android platform [OK]

Hint: Use UNITY_ prefix for platform symbols [OK]

Common Mistakes:

• Using incorrect symbols like ANDROID or PLATFORM_ANDROID
• Assuming UNITY_MOBILE covers Android specifically
• Missing #endif to close the directive

3. What will be the output when running this Unity C# code on iOS platform?

#if UNITY_IOS
Console.WriteLine("Running on iOS");
#else
Console.WriteLine("Running on other platform");
#endif

medium

A. Running on other platform

B. No output

C. Compilation error

D. Running on iOS

Solution

1. Step 1: Check platform directive

   The code uses #if UNITY_IOS, which is true on iOS platform.

2. Step 2: Determine executed code

   Since UNITY_IOS is defined, it prints "Running on iOS".

3. Final Answer:

   Running on iOS -> Option D

4. Quick Check:

   UNITY_IOS true prints iOS message [OK]

Hint: Match platform symbol with current device [OK]

Common Mistakes:

• Confusing UNITY_IOS with UNITY_IPHONE
• Expecting else block to run on iOS
• Thinking code causes compilation error

4. Identify the error in this Unity C# code snippet for platform-specific compilation:

#if UNITY_STANDALONE
Debug.Log("Standalone platform");
#else
Debug.Log("Other platform");

medium

A. Missing #endif to close the #if directive

B. Wrong platform symbol UNITY_STANDALONE

C. Debug.Log cannot be used in platform directives

D. No error, code is correct

Solution

1. Step 1: Check #if directive syntax

   The code starts with #if but does not have a matching #endif.

2. Step 2: Understand preprocessor rules

   Every #if must be closed with #endif to avoid compilation errors.

3. Final Answer:

   Missing #endif to close the #if directive -> Option A

4. Quick Check:

   #if must end with #endif [OK]

Hint: Always close #if with #endif [OK]

Common Mistakes:

• Assuming UNITY_STANDALONE is invalid
• Thinking Debug.Log is disallowed inside #if
• Ignoring missing #endif causes errors

5. You want to write code that runs only on Windows or macOS but not on mobile platforms. Which directive correctly achieves this in Unity?

hard

A. #if UNITY_STANDALONE
// code
#endif

B. #if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX
// code
#endif

C. #if UNITY_ANDROID || UNITY_IOS
// code
#endif

D. #if UNITY_MOBILE
// code
#endif

Solution

1. Step 1: Identify platforms to include

   Windows and macOS correspond to UNITY_STANDALONE_WIN and UNITY_STANDALONE_OSX.

2. Step 2: Combine platform symbols correctly

   Use logical OR (||) to include both platforms in one directive.

3. Final Answer:

   #if UNITY_STANDALONE_WIN || UNITY_STANDALONE_OSX // code #endif -> Option B

4. Quick Check:

   Use || to combine Windows and macOS platforms [OK]

Hint: Use || to combine multiple platforms [OK]

Common Mistakes:

• Using UNITY_STANDALONE alone includes all standalone platforms
• Confusing mobile symbols with desktop platforms
• Using && instead of || for platform combination