Accessing and changing the volume of the device

So it's getting late and this might start to sound like ramblings, I've been doing readings on Unity and Android's website for a few hours now and while I think I'm closer to an answer I'm also confused as .
I figured out how to know when the buttons on my phone are pushed, and to use them to in my game. Now I'm looking to raise and lower the volume of the device I'm playing on, and it's not as easy as I'd hoped.

This has been one of the more helpful links I've found so far http://sudarmuthu.com/blog/adjusting-the-volume-in-android-through-code
So far what I've gathered is I have to get an Instance of the audio manager, then pass certain code on to that.

Then I was reading on Unity's website that it looks like I have to write a plugin that allows me to call these functions.

I'm very early on in moving my game to my android. I'm currently looking for some direction and reassurance that I'm on the right path to change the volume of my device. Do I need to write a plug in? So any help would be great. I'm looking for more direction so I can figure out how to access the android commands and less "write this code" because if I figure out how to do it I'm sure I'll figure out more along the way.

 

I know this is an ancient topic, but I stumbled across this issue and found a solution, so I'll post the answer for anyone else who might find themselves here. In order to change the volume you need to access Unity java code. The code below seems to work for all devices I had.

Code (CSharp):

1.  
2.     private static int GetDeviceMaxVolume() {
3.         int streammusic = 3;
4.         return deviceAudio.Call<int>("getStreamMaxVolume", streammusic);
5.     }
6.  
7.     private static void SetDeviceVolume(int value) {
8.         int streammusic = 3;
9.         int flagshowui = 0;
10.      
11.         deviceAudio.Call("setStreamVolume", streammusic, value, flagshowui);
12.     }
13.  
14.     private static AndroidJavaObject audioManager;
15.  
16.     private static AndroidJavaObject deviceAudio { get {
17.         if(audioManager == null) {
18.             AndroidJavaClass up = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
19.             AndroidJavaObject context = up.GetStatic<AndroidJavaObject>("currentActivity");
20.  
21.             string audioName = context.GetStatic<string>("AUDIO_SERVICE");
22.  
23.             audioManager = context.Call<AndroidJavaObject>("getSystemService", audioName);
24.         }
25.         return audioManager;
26.     } }
27.  

 

hm, I get an error when I use my bundle id:
AndroidJavaException: java.lang.ClassNotFoundException: com.sfinxit.vrmovieplayer

Device: Oculus Go

 

A bit late, but

Code (CSharp):

1. AndroidJavaClass up = AndroidJavaClass("com.unity3d.player.UnityPlayer");

does not take your bundleID as input, this is the class name of

UnityPlayer

that is accessed as a

AndroidJavaClass

here.

See also:
https://docs.unity3d.com/540/Documentation/Manual/PluginsForAndroid.html

 

I got the following error:
JNI DETECTED ERROR IN APPLICATION: static jfieldID 0x6f933670 not valid for class java.lang.Class<com.unity3d.player.UnityPlayerActivity>
04-23 09:42:05.221 1423 1441 F art : art/runtime/java_vm_ext.cc:470] in call to GetStaticObjectField


Seems like "AUDIO_SERVICE" maybe isn't the right field anymore?

 

I saw some problems with some Android devices as well. Samsung S8 wouldn't work, while Google Pixel worked just fine. I ended up re-writing this differently and haven't found any issue since, so hopefully this helps someone out as well.

Code (CSharp):

1.  
2. public class AndroidNativeVolumeService
3.     {
4.         static int STREAMMUSIC;
5.         static int FLAGSHOWUI = 1;
6.  
7.         private static AndroidJavaObject audioManager;
8.  
9.         private static AndroidJavaObject deviceAudio
10.         {
11.             get
12.             {
13.                 if (audioManager == null)
14.                 {
15.                     AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
16.                     AndroidJavaObject currentActivity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity");
17.                     AndroidJavaObject context = currentActivity.Call<AndroidJavaObject>("getApplicationContext");
18.                     AndroidJavaClass audioManagerClass = new AndroidJavaClass("android.media.AudioManager");
19.                     AndroidJavaClass contextClass = new AndroidJavaClass("android.content.Context");
20.  
21.                     STREAMMUSIC = audioManagerClass.GetStatic<int>("STREAM_MUSIC");
22.                     string Context_AUDIO_SERVICE = contextClass.GetStatic<string>("AUDIO_SERVICE");
23.  
24.                     audioManager = context.Call<AndroidJavaObject>("getSystemService", Context_AUDIO_SERVICE);
25.  
26.                     if (audioManager != null)
27.                         DebugLog.Log("[AndroidNativeVolumeService] Android Audio Manager successfully set up");
28.                     else
29.                         DebugLog.Log("[AndroidNativeVolumeService] Could not read Audio Manager");
30.                 }
31.                 return audioManager;
32.             }
33.  
34.         }
35.  
36.         private static int GetDeviceMaxVolume()
37.         {
38.             return deviceAudio.Call<int>("getStreamMaxVolume", STREAMMUSIC);
39.         }
40.  
41.         public float GetSystemVolume()
42.         {
43.             int deviceVolume = deviceAudio.Call<int>("getStreamVolume", STREAMMUSIC);
44.             float scaledVolume = (float)(deviceVolume / (float)GetDeviceMaxVolume());
45.  
46.             return scaledVolume;
47.         }
48.  
49.         public void SetSystemVolume(float volumeValue)
50.         {
51.             int scaledVolume = (int)(volumeValue * (float)GetDeviceMaxVolume());
52.             deviceAudio.Call("setStreamVolume", STREAMMUSIC, scaledVolume, FLAGSHOWUI);
53.         }
54.     }

 

Exactly what I was looking for! Thank you so much for this.

 

Is there a way to do the same thing for IOS ?

 

This worked perfectly for me! What a hero!