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1Instruction of running webrtc_unity_plugin on Android Unity
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31. On Linux machine, compile target webrtc_unity_plugin.
4   Checkout WebRTC codebase: fetch --nohooks webrtc_android
5   If you already have a checkout for linux, add target_os=”android” into .gclient file.
6      Run gclient sync
7      Run gn args out/Android, and again set target_os=”android” in the args.gn
8      Run ninja -C out/Android webrtc_unity_plugin
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102. On Linux machine, build target libwebrtc_unity under webrtc checkout. This is the java code for webrtc to work on Android.
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123. Copy libwebrtc_unity.jar and libwebrtc_unity_plugin.so into Unity project folder, under Assets/Plugins/Android folder.
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144. Rename libwebrtc_unity_plugin.so to libjingle_peerconnection_so.so. This is hacky, and the purpose is to let the java code in libwebrtc_unity.jar to find their JNI implementations. Simultaneously, in your C# wrapper script for the native plugin libjingle_peerconnection_so.so, the dll_path should be set to “jingle_peerconnection_so”.
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165. In the Unity Main Scene’s Start method, write the following code to initialize the Java environment for webrtc (otherwise, webrtc will not be able to access audio device or camera from C++ code):
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18#if UNITY_ANDROID
19    AndroidJavaClass playerClass = new AndroidJavaClass("com.unity3d.player.UnityPlayer");
20    AndroidJavaObject activity = playerClass.GetStatic<AndroidJavaObject>("currentActivity");
21    AndroidJavaClass utilityClass = new AndroidJavaClass("org.webrtc.UnityUtility");
22    utilityClass.CallStatic("InitializePeerConncectionFactory", new object[1] { activity });
23#endif
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256. Compile the unity project into an APK, and decompile the apk using apktool that you can download from https://ibotpeaches.github.io/Apktool/
26    Run apktool d apkname.apk.
27Then copy the AndroidManifest.xml in the decompiled folder to the Assets/Plugins/Android folder, and add two lines:
28  <uses-permission android:name="android.permission.RECORD_AUDIO" />
29  <uses-permission android:name="android.permission.CAMERA" />
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31The purpose of using apktool is to get a well-written android manifest xml file. If you know how to write manifest file from scratch, you can skip using apktool.
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337. Compile the unity project into an APK again and deploy it to an android device.
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