Android volume button pluggin

Author: CAMOBAP

.gitignore

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+# This .gitignore file should be placed at the root of your Unity project directory
+#
+# Get latest from https://github.com/github/gitignore/blob/master/Unity.gitignore
+#
+/[Ll]ibrary/
+/[Tt]emp/
+/[Oo]bj/
+/[Bb]uild/
+/[Bb]uilds/
+/[Ll]ogs/
+/[Uu]ser[Ss]ettings/
+
+# MemoryCaptures can get excessive in size.
+# They also could contain extremely sensitive data
+/[Mm]emoryCaptures/
+
+# Asset meta data should only be ignored when the corresponding asset is also ignored
+!/[Aa]ssets/**/*.meta
+
+# Uncomment this line if you wish to ignore the asset store tools plugin
+# /[Aa]ssets/AssetStoreTools*
+
+# Autogenerated Jetbrains Rider plugin
+/[Aa]ssets/Plugins/Editor/JetBrains*
+
+# Visual Studio cache directory
+.vs/
+
+# Gradle cache directory
+.gradle/
+
+# Autogenerated VS/MD/Consulo solution and project files
+ExportedObj/
+.consulo/
+*.csproj
+*.unityproj
+*.sln
+*.suo
+*.tmp
+*.user
+*.userprefs
+*.pidb
+*.booproj
+*.svd
+*.pdb
+*.mdb
+*.opendb
+*.VC.db
+
+# Unity3D generated meta files
+*.pidb.meta
+*.pdb.meta
+*.mdb.meta
+
+# Unity3D generated file on crash reports
+sysinfo.txt
+
+# Builds
+*.apk
+*.unitypackage
+
+# Crashlytics generated file
+crashlytics-build.properties
+
+# Packed Addressables
+/[Aa]ssets/[Aa]ddressable[Aa]ssets[Dd]ata/*/*.bin*
+
+# Temporary auto-generated Android Assets
+/[Aa]ssets/[Ss]treamingAssets/aa.meta
+/[Aa]ssets/[Ss]treamingAssets/aa/*

Assets/Plugins.meta

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="org.camobap.unity3d">
+  <application android:icon="@drawable/app_icon" android:label="@string/app_name">
+    <activity android:name="org.camobap.unity3d.VolumeButtonsActivity"
+             android:label="@string/app_name"
+             android:configChanges="fontScale|keyboard|keyboardHidden|locale|mnc|mcc|navigation|orientation|screenLayout|screenSize|smallestScreenSize|uiMode|touchscreen">
+        <intent-filter>
+            <action android:name="android.intent.action.MAIN" />
+            <category android:name="android.intent.category.LAUNCHER" />
+        </intent-filter>
+    </activity>
+  </application>
+</manifest>

Assets/Plugins/Android.meta

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+package org.camobap.unity3d;
+
+import java.util.List;
+import java.util.ArrayList;
+
+import android.os.Bundle;
+import android.util.Log;
+import android.view.KeyEvent;
+
+import com.unity3d.player.UnityPlayer;
+import com.unity3d.player.UnityPlayerActivity;
+
+public class VolumeButtonsActivity extends UnityPlayerActivity {
+
+  /**
+   * Keep in sync with VolumeButton.Event in C#
+   */
+  private enum Event {
+    VOLUME_DOWN(-1),
+    VOLUME_MUTE(0),
+    VOLUME_UP(+1);
+
+    private final String mValue;
+    private Event(int type) {
+      mValue = Integer.toString(type);
+    }
+
+    public String getValue() {
+      return mValue;
+    }
+  }
+
+  private static final String MESSAGE_NAME = "_OnVolumeButtonEvent";
+  private List<String> gameObjectNames = new ArrayList<>();
+
+  protected void onCreate(Bundle savedInstanceState) {
+    super.onCreate(savedInstanceState);
+    // print debug message to logcat
+    Log.d("VolumeButtonsActivity", "onCreate called!");
+  }
+
+  public void addGameObjectListener(String gameObjectName)
+  {
+    synchronized (gameObjectNames)
+    {
+      gameObjectNames.add(gameObjectName);
+    }
+  }
+
+  public void removeGameObjectListener(String gameObjectName)
+  {
+    synchronized (gameObjectNames)
+    {
+      gameObjectNames.remove(gameObjectName);
+    }
+  }
+  
+  @Override
+  public boolean dispatchKeyEvent(KeyEvent event) {
+    int action = event.getAction();
+    int keyCode = event.getKeyCode();
+    switch (keyCode) {
+    case KeyEvent.KEYCODE_VOLUME_UP:
+      if (action == KeyEvent.ACTION_DOWN) {
+        for (String gameObjectName : gameObjectNames) {
+          UnityPlayer.UnitySendMessage(gameObjectName, MESSAGE_NAME, Event.VOLUME_UP.getValue());
+        }
+      }
+      break;
+    case KeyEvent.KEYCODE_VOLUME_DOWN:
+      if (action == KeyEvent.ACTION_DOWN) {
+        for (String gameObjectName : gameObjectNames) {
+          UnityPlayer.UnitySendMessage(gameObjectName, MESSAGE_NAME, Event.VOLUME_DOWN.getValue());
+        }
+      }
+      break;
+    }
+
+    return super.dispatchKeyEvent(event);
+  }
+}

Assets/Plugins/Android/AndroidManifest.xml

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+using System;
+using System.Collections;
+using System.Collections.Generic;
+
+using UnityEngine;
+
+public class VolumeButtons : MonoBehaviour
+{
+    #if !UNITY_ANDROID && !UNITY_IOS
+	private readonly RuntimePlatform[] SupportedPlatforms = new RuntimePlatform[] { RuntimePlatform.Android, RuntimePlatform.IPhonePlayer};
+    private readonly string UnsupportedError = "Unsupported platform '{0}'! At the moment we support only {1}";
+    #endif
+
+    public VolumeButtonsEvent OnVolumeButtonEvent;
+
+    void Start()
+    {
+		#if UNITY_ANDROID
+	        _CallActivity("addGameObjectListener", gameObject.name);
+    	#elif UNITY_IOS
+	        // FIXME
+    	#else
+			Debug.LogFormat(UnsupportedError, Application.platform, string.Join("", SupportedPlatforms));
+    	#endif
+    }
+ 
+    void OnDisable()
+    {
+		#if UNITY_ANDROID
+	        _CallActivity("removeGameObjectListener", gameObject.name);
+    	#elif UNITY_IOS
+	        // FIXME
+    	#else
+			Debug.LogFormat(UnsupportedError, Application.platform, string.Join("", SupportedPlatforms));
+    	#endif
+    }
+
+    private void _OnVolumeButtonEvent(string value)
+    {
+    	if (OnVolumeButtonEvent != null)
+    	{
+    		this.OnVolumeButtonEvent.Invoke((VolumeButtonsEventType)Int32.Parse(value));
+    	}
+    	else
+    	{
+    		Debug.Log("No event subscribed!");
+    	}
+    }
+
+    private void _CallActivity(string methodName, string arg0)
+    {
+    	AndroidJNIHelper.debug = true;
+        using (AndroidJavaClass unityPlayerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer")) { 
+        	using (AndroidJavaObject activity = unityPlayerClass.GetStatic<AndroidJavaObject>("currentActivity")) {
+        		Debug.LogFormat("Call {0}({1})", methodName, arg0);
+	            activity.Call(methodName, arg0); 
+	        }
+        } 
+    }
+}