Change Song on Button Press in Unity Using C# and AudioSource

Learn how to implement a button in Unity that changes songs each time it's pressed. This guide provides a step-by-step solution to successfully switching between multiple audio clips using C-.
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This video is based on the question https://stackoverflow.com/q/73984449/ asked by the user 'Z.Mizzi' ( https://stackoverflow.com/u/10891283/ ) and on the answer https://stackoverflow.com/a/73984769/ provided by the user 'Soroush Hosseinpour' ( https://stackoverflow.com/u/7917771/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

Are you looking to add a fun feature to your Unity game, allowing users to change the background music by simply pressing a button? This guide addresses a common problem faced by developers: enabling a button to switch between multiple audio tracks seamlessly.

In this post, we'll walk through a practical solution to implement a music button that plays a different song each time it is pressed. You'll learn how to set up an array of audio clips and how to manage song transitions effortlessly. Let's dive in!

The Problem

You want to create a button in Unity that allows players to switch between four songs on demand. Here's how the desired functionality should work:

The first button press plays song 1.

The second press plays song 2, and so on up to song 4.

If the button isn't pressed again, the current song continues playing.

The user can change the song at any point, regardless of which song is currently playing.

Initially, there was an issue with the existing implementation—only the first song played upon multiple button presses. Let’s explore how to fix this.

The Solution

Step 1: Set Up Your Audio Clips

First, ensure you have your audio clips ready in your Unity project. Create an array to hold all your song clips. Here’s what that looks like in C-:

[[See Video to Reveal this Text or Code Snippet]]

Step 2: Starting the Song Playback

In the unity lifecycle, you should start the song playback when your game begins. This is implemented using the Start method:

[[See Video to Reveal this Text or Code Snippet]]

Step 3: Play Songs Sequentially

Create a coroutine that will manage playing the audio clips. This coroutine will wait until a song is finished before allowing the next one to play:

[[See Video to Reveal this Text or Code Snippet]]

Step 4: Manage Song Endings

To handle the transition between songs, create a method that updates the song counter and starts playing the next song:

[[See Video to Reveal this Text or Code Snippet]]

Step 5: Detect Button Presses

Finally, link your button to the CallMethod function. When the button is pressed, it simply calls SongEnded, which handles the logic of selecting and playing the next song.

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following these steps, you can effectively create a button in Unity that changes songs with each press. This method ensures a smooth transition by managing the state of the audio clips efficiently. Whether your players wish to switch tracks mid-game or want to choose their preferred background music, this setup will achieve just that! Now, roll out the tunes and let your game's audio enhance the player experience!

If you have any further questions or run into issues, feel free to ask. Happy coding!

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