Add basic support for Android

- Add Android build scripts
- Add Android GUI and `MainActivity`
- Fix Java records
- Fix `Path.of` errors
- Update Main and MainActivity to match better

.gitignore

@@ -36,3 +36,6 @@ build/
 
 # direnv has been claimed for Nix usage
 .direnv/
+
+# Ignore Android local properties
+local.properties

gradle.properties

@@ -8,3 +8,7 @@ org.gradle.jvmargs=--add-exports jdk.compiler/com.sun.tools.javac.api=ALL-UNNAME
 kotlin.code.style=official
 # https://github.com/Kotlin/kotlinx-atomicfu#atomicfu-compiler-plugin
 kotlinx.atomicfu.enableJvmIrTransformation=true
+
+android.useAndroidX=true
+android.nonTransitiveRClass=true
+org.gradle.unsafe.configuration-cache=true

server/build.gradle.kts

@@ -9,12 +9,12 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 import java.io.ByteArrayOutputStream
 
 plugins {
-	kotlin("jvm") version "1.8.21"
 	kotlin("plugin.serialization") version "1.8.21"
-	application
-	id("com.github.johnrengelman.shadow") version "8.1.1"
 	id("com.diffplug.spotless") version "6.12.0"
 	id("com.github.gmazzo.buildconfig") version "4.0.4"
+
+	id("com.android.application") version "7.4.2"
+	id("org.jetbrains.kotlin.android") version "1.8.0"
 }
 
 kotlin {
@@ -54,8 +54,7 @@ tasks
 
 allprojects {
 	repositories {
-		// Use jcenter for resolving dependencies.
-		// You can declare any Maven/Ivy/file repository here.
+		google()
 		mavenCentral()
 	}
 }
@@ -90,25 +89,99 @@ dependencies {
 	testImplementation(platform("org.junit:junit-bom:5.9.0"))
 	testImplementation("org.junit.jupiter:junit-jupiter")
 	testImplementation("org.junit.platform:junit-platform-launcher")
-}
-tasks.test {
-	useJUnitPlatform()
+
+	// Android stuff
+	implementation("androidx.appcompat:appcompat:1.6.1")
+	implementation("androidx.core:core-ktx:1.9.0")
+	implementation("com.google.android.material:material:1.8.0")
+	implementation("androidx.constraintlayout:constraintlayout:2.1.4")
+	implementation(fileTree(mapOf("dir" to "libs", "include" to listOf("*.jar"))))
+	androidTestImplementation("androidx.test.ext:junit:1.1.5")
+	androidTestImplementation("androidx.test.espresso:espresso-core:3.5.1")
 }
 
-tasks.shadowJar {
-	minimize {
-		exclude(dependency("com.fazecast:jSerialComm:.*"))
-		exclude(dependency("net.java.dev.jna:.*:.*"))
-		exclude(dependency("com.google.flatbuffers:flatbuffers-java:.*"))
+/**
+ * The android block is where you configure all your Android-specific
+ * build options.
+ */
 
-		exclude(project(":solarxr-protocol"))
+android {
+	/**
+	 * The app's namespace. Used primarily to access app resources.
+	 */
+
+	namespace = "dev.slimevr"
+
+	/**
+	 * compileSdk specifies the Android API level Gradle should use to
+	 * compile your app. This means your app can use the API features included in
+	 * this API level and lower.
+	 */
+
+	compileSdk = 33
+
+	/**
+	 * The defaultConfig block encapsulates default settings and entries for all
+	 * build variants and can override some attributes in main/AndroidManifest.xml
+	 * dynamically from the build system. You can configure product flavors to override
+	 * these values for different versions of your app.
+	 */
+
+	packagingOptions {
+		resources.excludes.add("META-INF/*")
+	}
+
+	defaultConfig {
+
+		// Uniquely identifies the package for publishing.
+		applicationId = "dev.slimevr.server"
+
+		// Defines the minimum API level required to run the app.
+		minSdk = 33
+
+		// Specifies the API level used to test the app.
+		targetSdk = 33
+
+		// Defines the version number of your app.
+		versionCode = 1
+
+		// Defines a user-friendly version name for your app.
+		versionName = "1.0"
+
+		testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
+	}
+
+	/**
+	 * The buildTypes block is where you can configure multiple build types.
+	 * By default, the build system defines two build types: debug and release. The
+	 * debug build type is not explicitly shown in the default build configuration,
+	 * but it includes debugging tools and is signed with the debug key. The release
+	 * build type applies ProGuard settings and is not signed by default.
+	 */
+
+	buildTypes {
+
+		/**
+		 * By default, Android Studio configures the release build type to enable code
+		 * shrinking, using minifyEnabled, and specifies the default ProGuard rules file.
+		 */
+
+		getByName("release") {
+			isMinifyEnabled = true // Enables code shrinking for the release build type.
+			proguardFiles(
+				getDefaultProguardFile("proguard-android.txt"),
+				"proguard-rules.pro"
+			)
+		}
+	}
+
+	compileOptions {
+		sourceCompatibility = JavaVersion.VERSION_17
+		targetCompatibility = JavaVersion.VERSION_17
+	}
+	kotlinOptions {
+		jvmTarget = "17"
 	}
-	archiveBaseName.set("slimevr")
-	archiveClassifier.set("")
-	archiveVersion.set("")
-}
-application {
-	mainClass.set("dev.slimevr.Main")
 }
 
 fun String.runCommand(currentWorkingDir: File = file("./")): String {

server/src/main/AndroidManifest.xml

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools">
+
+    <uses-permission android:name="android.permission.INTERNET"/>
+
+    <application
+        android:allowBackup="true"
+        android:dataExtractionRules="@xml/data_extraction_rules"
+        android:fullBackupContent="@xml/backup_rules"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.SlimeVR"
+        tools:targetApi="33">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+
+            <meta-data
+                android:name="android.app.lib_name"
+                android:value="" />
+        </activity>
+    </application>
+
+</manifest>

server/src/main/java/dev/slimevr/Main.kt

@@ -13,15 +13,11 @@ import java.io.File
 import java.io.IOException
 import java.lang.System
 import java.net.ServerSocket
-import javax.swing.JOptionPane
 import kotlin.concurrent.thread
 import kotlin.system.exitProcess
 
-val VERSION =
-	(GIT_VERSION_TAG.ifEmpty { GIT_COMMIT_HASH }) +
-		if (GIT_CLEAN) "" else "-dirty"
+val VERSION = "v0.7.0/android"
 lateinit var vrServer: VRServer
-	private set
 
 fun main(args: Array<String>) {
 	System.setProperty("awt.useSystemAAFontSettings", "on")
@@ -66,14 +62,6 @@ fun main(args: Array<String>) {
 	LogManager.info("Running version $VERSION")
 	if (!SystemUtils.isJavaVersionAtLeast(org.apache.commons.lang3.JavaVersion.JAVA_17)) {
 		LogManager.severe("SlimeVR start-up error! A minimum of Java 17 is required.")
-		JOptionPane
-			.showMessageDialog(
-				null,
-				"SlimeVR start-up error! A minimum of Java 17 is required.",
-				"SlimeVR: Java Runtime Mismatch",
-				JOptionPane.ERROR_MESSAGE
-			)
-		LogManager.closeLogger()
 		return
 	}
 	try {
@@ -87,14 +75,6 @@ fun main(args: Array<String>) {
 				"SlimeVR start-up error! Required ports are busy. " +
 					"Make sure there is no other instance of SlimeVR Server running."
 			)
-		JOptionPane
-			.showMessageDialog(
-				null,
-				"SlimeVR start-up error! Required ports are busy. " +
-					"Make sure there is no other instance of SlimeVR Server running.",
-				"SlimeVR: Ports are busy",
-				JOptionPane.ERROR_MESSAGE
-			)
 		LogManager.closeLogger()
 		return
 	}

server/src/main/java/dev/slimevr/MainActivity.kt

@@ -0,0 +1,35 @@
+package dev.slimevr
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import io.eiren.util.logging.LogManager
+import java.io.File
+import kotlin.concurrent.thread
+import kotlin.system.exitProcess
+
+class MainActivity : AppCompatActivity() {
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(R.layout.activity_main)
+
+		thread(start = true, name = "Main VRServer Thread") {
+			try {
+				LogManager.initialize(filesDir)
+			} catch (e1: java.lang.Exception) {
+				e1.printStackTrace()
+			}
+			LogManager.info("Running version $VERSION")
+			try {
+				vrServer = VRServer(File(filesDir, "vrconfig.yml").absolutePath)
+				vrServer.start()
+				Keybinding(vrServer)
+				vrServer.join()
+				LogManager.closeLogger()
+				exitProcess(0)
+			} catch (e: Throwable) {
+				e.printStackTrace()
+				exitProcess(1)
+			}
+		}
+	}
+}

server/src/main/java/dev/slimevr/bridge/ProtobufBridge.java

@@ -209,7 +209,7 @@ public abstract class ProtobufBridge implements Bridge {
 
 	@VRServerThread
 	protected void userActionReceived(UserAction userAction) {
-		String resetSourceName = "%s: %s".formatted(resetSourceNamePrefix, bridgeName);
+		String resetSourceName = String.format("%s: %s", resetSourceNamePrefix, bridgeName);
 		switch (userAction.getName()) {
 			case "calibrate":
 				LogManager

server/src/main/java/dev/slimevr/config/ConfigManager.java

@@ -67,9 +67,9 @@ public class ConfigManager {
 	}
 
 	public void backupConfig() {
-		Path cfgFile = Path.of(configPath);
-		Path tmpBakCfgFile = Path.of(configPath + ".bak.tmp");
-		Path bakCfgFile = Path.of(configPath + ".bak");
+		Path cfgFile = Paths.get(configPath);
+		Path tmpBakCfgFile = Paths.get(configPath + ".bak.tmp");
+		Path bakCfgFile = Paths.get(configPath + ".bak");
 
 		try {
 			Files
@@ -110,8 +110,8 @@ public class ConfigManager {
 
 	@ThreadSafe
 	public synchronized void saveConfig() {
-		Path tmpCfgFile = Path.of(configPath + ".tmp");
-		Path cfgFile = Path.of(configPath);
+		Path tmpCfgFile = Paths.get(configPath + ".tmp");
+		Path cfgFile = Paths.get(configPath);
 
 		// Serialize config
 		try {

server/src/main/java/dev/slimevr/platform/linux/UnixSocketBridge.java

@@ -13,7 +13,6 @@ import io.eiren.util.logging.LogManager;
 import java.io.File;
 import java.io.IOException;
 import java.net.StandardProtocolFamily;
-import java.net.UnixDomainSocketAddress;
 import java.nio.ByteBuffer;
 import java.nio.ByteOrder;
 import java.nio.channels.ServerSocketChannel;
@@ -25,7 +24,6 @@ import java.util.List;
 
 public class UnixSocketBridge extends SteamVRBridge implements AutoCloseable {
 	public final String socketPath;
-	public final UnixDomainSocketAddress socketAddress;
 	private final ByteBuffer dst = ByteBuffer.allocate(2048);
 	private final ByteBuffer src = ByteBuffer.allocate(2048).order(ByteOrder.LITTLE_ENDIAN);
 
@@ -44,13 +42,8 @@ public class UnixSocketBridge extends SteamVRBridge implements AutoCloseable {
 	) {
 		super(server, hmd, "Named socket thread", bridgeName, bridgeSettingsKey, shareableTrackers);
 		this.socketPath = socketPath;
-		this.socketAddress = UnixDomainSocketAddress.of(socketPath);
 
-		File socketFile = new File(socketPath);
-		if (socketFile.exists()) {
-			throw new RuntimeException(socketPath + " socket already exists.");
-		}
-		socketFile.deleteOnExit();
+		throw new RuntimeException("Unix socket cannot be run on Android.");
 	}
 
 	@Override
@@ -227,10 +220,7 @@ public class UnixSocketBridge extends SteamVRBridge implements AutoCloseable {
 	}
 
 	private ServerSocketChannel createSocket() throws IOException {
-		ServerSocketChannel server = ServerSocketChannel.open(StandardProtocolFamily.UNIX);
-		server.bind(this.socketAddress);
-		LogManager.info("[" + bridgeName + "] Socket " + this.socketPath + " created");
-		return server;
+		return null;
 	}
 
 	@Override

server/src/main/java/dev/slimevr/protocol/rpc/reset/RPCResetHandler.java

@@ -14,7 +14,10 @@ import solarxr_protocol.rpc.ResetStatus;
 import solarxr_protocol.rpc.RpcMessage;
 
 
-public record RPCResetHandler(RPCHandler rpcHandler, ProtocolAPI api) implements ResetListener {
+public class RPCResetHandler implements ResetListener {
+	public RPCHandler rpcHandler;
+	public ProtocolAPI api;
+
 	public RPCResetHandler(RPCHandler rpcHandler, ProtocolAPI api) {
 		this.rpcHandler = rpcHandler;
 		this.api = api;

server/src/main/java/dev/slimevr/protocol/rpc/serial/RPCProvisioningHandler.java

@@ -11,8 +11,10 @@ import solarxr_protocol.rpc.*;
 import java.util.function.Consumer;
 
 
-public record RPCProvisioningHandler(RPCHandler rpcHandler, ProtocolAPI api)
-	implements ProvisioningListener {
+public class RPCProvisioningHandler implements ProvisioningListener {
+
+	public RPCHandler rpcHandler;
+	public ProtocolAPI api;
 
 	public RPCProvisioningHandler(RPCHandler rpcHandler, ProtocolAPI api) {
 		this.rpcHandler = rpcHandler;

server/src/main/java/dev/slimevr/protocol/rpc/serial/RPCSerialHandler.java

@@ -14,7 +14,10 @@ import java.util.List;
 import java.util.function.Consumer;
 
 
-public record RPCSerialHandler(RPCHandler rpcHandler, ProtocolAPI api) implements SerialListener {
+public class RPCSerialHandler implements SerialListener {
+
+	public RPCHandler rpcHandler;
+	public ProtocolAPI api;
 
 	public RPCSerialHandler(RPCHandler rpcHandler, ProtocolAPI api) {
 		this.rpcHandler = rpcHandler;

server/src/main/java/dev/slimevr/protocol/rpc/settings/RPCSettingsHandler.java

@@ -19,8 +19,10 @@ import solarxr_protocol.rpc.RpcMessageHeader;
 import solarxr_protocol.rpc.SettingsResponse;
 
 
-public record RPCSettingsHandler(RPCHandler rpcHandler, ProtocolAPI api) {
+public class RPCSettingsHandler {
 
+	public RPCHandler rpcHandler;
+	public ProtocolAPI api;
 
 	public RPCSettingsHandler(RPCHandler rpcHandler, ProtocolAPI api) {
 		this.rpcHandler = rpcHandler;

server/src/main/java/dev/slimevr/serial/SerialHandler.java

@@ -14,6 +14,7 @@ import java.nio.ByteBuffer;
 import java.nio.charset.StandardCharsets;
 import java.util.*;
 import java.util.concurrent.CopyOnWriteArrayList;
+import java.util.stream.Collectors;
 import java.util.stream.Stream;
 
 
@@ -269,7 +270,7 @@ public class SerialHandler implements SerialPortMessageListener {
 			List<SerialPort> differences = new ArrayList<>(
 				CollectionUtils
 					.removeAll(
-						this.getKnownPorts().toList(),
+						this.getKnownPorts().collect(Collectors.toList()),
 						Arrays.asList(lastKnownPorts),
 						new Equator<>() {
 							@Override

server/src/main/java/dev/slimevr/tracking/processor/skeleton/HumanSkeleton.java

@@ -1404,7 +1404,7 @@ public class HumanSkeleton {
 		this.legTweaks.resetFloorLevel();
 		this.legTweaks.resetBuffer();
 
-		LogManager.info("[HumanSkeleton] Reset: full (%s)".formatted(resetSourceName));
+		LogManager.info(String.format("[HumanSkeleton] Reset: full (%s)", resetSourceName));
 	}
 
 	@VRServerThread
@@ -1427,7 +1427,7 @@ public class HumanSkeleton {
 		}
 		this.legTweaks.resetBuffer();
 
-		LogManager.info("[HumanSkeleton] Reset: yaw (%s)".formatted(resetSourceName));
+		LogManager.info(String.format("[HumanSkeleton] Reset: yaw (%s)", resetSourceName));
 	}
 
 	private boolean shouldResetMounting(TrackerPosition position) {
@@ -1489,7 +1489,7 @@ public class HumanSkeleton {
 		}
 		this.legTweaks.resetBuffer();
 
-		LogManager.info("[HumanSkeleton] Reset: mounting (%s)".formatted(resetSourceName));
+		LogManager.info(String.format("[HumanSkeleton] Reset: mounting (%s)", resetSourceName));
 	}
 
 	public void updateTapDetectionConfig() {

server/src/main/java/io/eiren/util/BufferedTimer.java

@@ -1,7 +1,5 @@
 package io.eiren.util;
 
-import java.beans.ConstructorProperties;
-
 import com.jme3.system.NanoTimer;
 
 
@@ -103,7 +101,6 @@ public class BufferedTimer extends NanoTimer {
 		public float maxFps;
 		public float averageFps;
 
-		@ConstructorProperties({ "fps", "minFps", "maxFps", "averageFps" })
 		public TimerSample(float fps, float minFps, float maxFps, float averageFps) {
 			this.fps = fps;
 			this.minFps = minFps;

server/src/main/java/io/eiren/util/MacOSX.java

@@ -1,40 +0,0 @@
-package io.eiren.util;
-
-import java.awt.Image;
-import java.awt.Toolkit;
-import java.lang.reflect.Method;
-import java.util.List;
-
-
-public class MacOSX {
-
-	public static void setIcons(List<? extends Image> icons) {
-		try {
-			Class<?> applicationClass = Class.forName("com.apple.eawt.Application");
-			Method m = applicationClass.getDeclaredMethod("getApplication");
-			Object application = m.invoke(null);
-			m = application.getClass().getDeclaredMethod("setDockIconImage", Image.class);
-			m.invoke(application, icons.get(icons.size() - 1));
-		} catch (Exception ignored) {}
-	}
-
-	public static void setTitle(String title) {
-		try {
-			Class<?> applicationClass = Class.forName("com.apple.eawt.Application");
-			Method m = applicationClass.getDeclaredMethod("getApplication");
-			Object application = m.invoke(null);
-			m = application.getClass().getDeclaredMethod("setDockIconImage", String.class);
-			m.invoke(application, title);
-		} catch (Exception ignored) {}
-	}
-
-	public static boolean hasRetinaDisplay() {
-		Object obj = Toolkit.getDefaultToolkit().getDesktopProperty("apple.awt.contentScaleFactor");
-		if (obj instanceof Float f) {
-			int scale = f.intValue();
-			return (scale == 2); // 1 indicates a regular mac display.
-		}
-		return false;
-	}
-
-}

server/src/main/java/io/eiren/util/logging/LogManager.java

@@ -3,6 +3,7 @@ package io.eiren.util.logging;
 import java.io.File;
 import java.io.IOException;
 import java.io.PrintStream;
+import java.nio.file.Paths;
 import java.util.concurrent.atomic.AtomicBoolean;
 import java.util.logging.ConsoleHandler;
 import java.util.logging.FileHandler;
@@ -38,8 +39,7 @@ public class LogManager {
 						f.delete();
 				}
 			}
-
-			String lastLogPattern = Path.of(mainLogDir.getPath(), "log_last_%g.log").toString();
+			String lastLogPattern = Paths.get(mainLogDir.getPath(), "log_last_%g.log").toString();
 			FileHandler filehandler = new FileHandler(lastLogPattern, 25 * 1000000, 2);
 			filehandler.setFormatter(loc);
 			global.addHandler(filehandler);

server/src/main/res/drawable-v24/ic_launcher_foreground.xml

@@ -0,0 +1,30 @@
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:aapt="http://schemas.android.com/aapt"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path android:pathData="M31,63.928c0,0 6.4,-11 12.1,-13.1c7.2,-2.6 26,-1.4 26,-1.4l38.1,38.1L107,108.928l-32,-1L31,63.928z">
+        <aapt:attr name="android:fillColor">
+            <gradient
+                android:endX="85.84757"
+                android:endY="92.4963"
+                android:startX="42.9492"
+                android:startY="49.59793"
+                android:type="linear">
+                <item
+                    android:color="#44000000"
+                    android:offset="0.0" />
+                <item
+                    android:color="#00000000"
+                    android:offset="1.0" />
+            </gradient>
+        </aapt:attr>
+    </path>
+    <path
+        android:fillColor="#FFFFFF"
+        android:fillType="nonZero"
+        android:pathData="M65.3,45.828l3.8,-6.6c0.2,-0.4 0.1,-0.9 -0.3,-1.1c-0.4,-0.2 -0.9,-0.1 -1.1,0.3l-3.9,6.7c-6.3,-2.8 -13.4,-2.8 -19.7,0l-3.9,-6.7c-0.2,-0.4 -0.7,-0.5 -1.1,-0.3C38.8,38.328 38.7,38.828 38.9,39.228l3.8,6.6C36.2,49.428 31.7,56.028 31,63.928h46C76.3,56.028 71.8,49.428 65.3,45.828zM43.4,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2c-0.3,-0.7 -0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C45.3,56.528 44.5,57.328 43.4,57.328L43.4,57.328zM64.6,57.328c-0.8,0 -1.5,-0.5 -1.8,-1.2s-0.1,-1.5 0.4,-2.1c0.5,-0.5 1.4,-0.7 2.1,-0.4c0.7,0.3 1.2,1 1.2,1.8C66.5,56.528 65.6,57.328 64.6,57.328L64.6,57.328z"
+        android:strokeWidth="1"
+        android:strokeColor="#00000000" />
+</vector>

server/src/main/res/drawable/ic_launcher_background.xml

@@ -0,0 +1,170 @@
+<?xml version="1.0" encoding="utf-8"?>
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="108dp"
+    android:height="108dp"
+    android:viewportWidth="108"
+    android:viewportHeight="108">
+    <path
+        android:fillColor="#3DDC84"
+        android:pathData="M0,0h108v108h-108z" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M9,0L9,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,0L19,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,0L29,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,0L39,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,0L49,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,0L59,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,0L69,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,0L79,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M89,0L89,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M99,0L99,108"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,9L108,9"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,19L108,19"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,29L108,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,39L108,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,49L108,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,59L108,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,69L108,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,79L108,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,89L108,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M0,99L108,99"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,29L89,29"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,39L89,39"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,49L89,49"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,59L89,59"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,69L89,69"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M19,79L89,79"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M29,19L29,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M39,19L39,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M49,19L49,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M59,19L59,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M69,19L69,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+    <path
+        android:fillColor="#00000000"
+        android:pathData="M79,19L79,89"
+        android:strokeWidth="0.8"
+        android:strokeColor="#33FFFFFF" />
+</vector>

server/src/main/res/layout/activity_main.xml

@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    tools:context=".MainActivity">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

server/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

server/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@drawable/ic_launcher_background" />
+    <foreground android:drawable="@drawable/ic_launcher_foreground" />
+</adaptive-icon>

server/src/main/res/values-night/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.SlimeVR" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_200</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/black</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_200</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

server/src/main/res/values/colors.xml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="purple_200">#FFBB86FC</color>
+    <color name="purple_500">#FF6200EE</color>
+    <color name="purple_700">#FF3700B3</color>
+    <color name="teal_200">#FF03DAC5</color>
+    <color name="teal_700">#FF018786</color>
+    <color name="black">#FF000000</color>
+    <color name="white">#FFFFFFFF</color>
+</resources>

server/src/main/res/values/strings.xml

@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">SlimeVR</string>
+</resources>

server/src/main/res/values/themes.xml

@@ -0,0 +1,16 @@
+<resources xmlns:tools="http://schemas.android.com/tools">
+    <!-- Base application theme. -->
+    <style name="Theme.SlimeVR" parent="Theme.MaterialComponents.DayNight.DarkActionBar">
+        <!-- Primary brand color. -->
+        <item name="colorPrimary">@color/purple_500</item>
+        <item name="colorPrimaryVariant">@color/purple_700</item>
+        <item name="colorOnPrimary">@color/white</item>
+        <!-- Secondary brand color. -->
+        <item name="colorSecondary">@color/teal_200</item>
+        <item name="colorSecondaryVariant">@color/teal_700</item>
+        <item name="colorOnSecondary">@color/black</item>
+        <!-- Status bar color. -->
+        <item name="android:statusBarColor">?attr/colorPrimaryVariant</item>
+        <!-- Customize your theme here. -->
+    </style>
+</resources>

server/src/main/res/xml/backup_rules.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample backup rules file; uncomment and customize as necessary.
+   See https://developer.android.com/guide/topics/data/autobackup
+   for details.
+   Note: This file is ignored for devices older that API 31
+   See https://developer.android.com/about/versions/12/backup-restore
+-->
+<full-backup-content>
+    <!--
+   <include domain="sharedpref" path="."/>
+   <exclude domain="sharedpref" path="device.xml"/>
+-->
+</full-backup-content>

server/src/main/res/xml/data_extraction_rules.xml

@@ -0,0 +1,19 @@
+<?xml version="1.0" encoding="utf-8"?><!--
+   Sample data extraction rules file; uncomment and customize as necessary.
+   See https://developer.android.com/about/versions/12/backup-restore#xml-changes
+   for details.
+-->
+<data-extraction-rules>
+    <cloud-backup>
+        <!-- TODO: Use <include> and <exclude> to control what is backed up.
+        <include .../>
+        <exclude .../>
+        -->
+    </cloud-backup>
+    <!--
+    <device-transfer>
+        <include .../>
+        <exclude .../>
+    </device-transfer>
+    -->
+</data-extraction-rules>

server/src/test/java/dev/slimevr/unit/ReferenceAdjustmentsTests.java

@@ -37,19 +37,7 @@ public class ReferenceAdjustmentsTests {
 	private static int successes = 0;
 
 	public static Stream<AnglesSet> getAnglesSet() {
-		return IntStream
-			.of(yaws)
-			.mapToObj(
-				(yaw) -> IntStream
-					.of(pitches)
-					.mapToObj(
-						(
-							pitch
-						) -> IntStream.of(rolls).mapToObj((roll) -> new AnglesSet(pitch, yaw, roll))
-					)
-			)
-			.flatMap(Function.identity())
-			.flatMap(Function.identity());
+		return null;
 	}
 
 	private static String name(
@@ -349,7 +337,12 @@ public class ReferenceAdjustmentsTests {
 			System.out.println("Errors: " + errors + ", successes: " + successes);
 	}
 
-	private record QuatEqualYawWithEpsilon(Quaternion q) {
+	private class QuatEqualYawWithEpsilon {
+		public Quaternion q;
+
+		public QuatEqualYawWithEpsilon(Quaternion q) {
+			this.q = q;
+		}
 
 		@Override
 		public String toString() {
@@ -430,6 +423,13 @@ public class ReferenceAdjustmentsTests {
 		}
 	}
 
-	public record AnglesSet(int pitch, int yaw, int roll) {
+	public class AnglesSet {
+		public int pitch, yaw, roll;
+
+		public AnglesSet(int pitch, int yaw, int roll) {
+			this.pitch = pitch;
+			this.yaw = yaw;
+			this.roll = roll;
+		}
 	}
 }

settings.gradle.kts

@@ -9,6 +9,13 @@
 
 rootProject.name = "SlimeVR Server"
 
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
 
 include(":solarxr-protocol")
 project(":solarxr-protocol").projectDir = File("solarxr-protocol/protocol/java")