Init using create-nitro-module

android/CMakeLists.txt

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+project(Omni)
+cmake_minimum_required(VERSION 3.9.0)
+
+set (PACKAGE_NAME Omni)
+set (CMAKE_VERBOSE_MAKEFILE ON)
+set (CMAKE_CXX_STANDARD 20)
+
+# Enable Raw Props parsing in react-native (for Nitro Views)
+add_compile_options(-DRN_SERIALIZABLE_STATE=1)
+
+# Define C++ library and add all sources
+add_library(${PACKAGE_NAME} SHARED
+        src/main/cpp/cpp-adapter.cpp
+)
+
+# Add Nitrogen specs :)
+include(${CMAKE_SOURCE_DIR}/../nitrogen/generated/android/Omni+autolinking.cmake)
+
+# Set up local includes
+include_directories(
+        "src/main/cpp"
+        "../cpp"
+)
+
+find_library(LOG_LIB log)
+
+# Link all libraries together
+target_link_libraries(
+        ${PACKAGE_NAME}
+        ${LOG_LIB}
+        android                                   # <-- Android core
+)

android/build.gradle

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+buildscript {
+  repositories {
+    google()
+    mavenCentral()
+  }
+
+  dependencies {
+    classpath "com.android.tools.build:gradle:8.8.0"
+  }
+}
+
+def reactNativeArchitectures() {
+  def value = rootProject.getProperties().get("reactNativeArchitectures")
+  return value ? value.split(",") : ["armeabi-v7a", "x86", "x86_64", "arm64-v8a"]
+}
+
+def isNewArchitectureEnabled() {
+  return rootProject.hasProperty("newArchEnabled") && rootProject.getProperty("newArchEnabled") == "true"
+}
+
+apply plugin: "com.android.library"
+apply plugin: 'org.jetbrains.kotlin.android'
+apply from: '../nitrogen/generated/android/Omni+autolinking.gradle'
+apply from: "./fix-prefab.gradle"
+
+if (isNewArchitectureEnabled()) {
+  apply plugin: "com.facebook.react"
+}
+
+def getExtOrDefault(name) {
+  return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties["Omni_" + name]
+}
+
+def getExtOrIntegerDefault(name) {
+  return rootProject.ext.has(name) ? rootProject.ext.get(name) : (project.properties["Omni_" + name]).toInteger()
+}
+
+android {
+  namespace "com.omni"
+
+  ndkVersion getExtOrDefault("ndkVersion")
+  compileSdkVersion getExtOrIntegerDefault("compileSdkVersion")
+
+  defaultConfig {
+    minSdkVersion getExtOrIntegerDefault("minSdkVersion")
+    targetSdkVersion getExtOrIntegerDefault("targetSdkVersion")
+    buildConfigField "boolean", "IS_NEW_ARCHITECTURE_ENABLED", isNewArchitectureEnabled().toString()
+
+    externalNativeBuild {
+      cmake {
+        cppFlags "-frtti -fexceptions -Wall -Wextra -fstack-protector-all"
+        arguments "-DANDROID_STL=c++_shared", "-DANDROID_SUPPORT_FLEXIBLE_PAGE_SIZES=ON"
+        abiFilters (*reactNativeArchitectures())
+
+        buildTypes {
+          debug {
+            cppFlags "-O1 -g"
+          }
+          release {
+            cppFlags "-O2"
+          }
+        }
+      }
+    }
+  }
+
+  externalNativeBuild {
+    cmake {
+      path "CMakeLists.txt"
+    }
+  }
+
+  packagingOptions {
+    excludes = [
+        "META-INF",
+        "META-INF/**",
+        "**/libc++_shared.so",
+        "**/libfbjni.so",
+        "**/libjsi.so",
+        "**/libfolly_json.so",
+        "**/libfolly_runtime.so",
+        "**/libglog.so",
+        "**/libhermes.so",
+        "**/libhermes-executor-debug.so",
+        "**/libhermes_executor.so",
+        "**/libreactnative.so",
+        "**/libreactnativejni.so",
+        "**/libturbomodulejsijni.so",
+        "**/libreact_nativemodule_core.so",
+        "**/libjscexecutor.so"
+    ]
+  }
+
+  buildFeatures {
+    buildConfig true
+    prefab true
+  }
+
+  buildTypes {
+    release {
+      minifyEnabled false
+    }
+  }
+
+  lintOptions {
+    disable "GradleCompatible"
+  }
+
+  compileOptions {
+    sourceCompatibility JavaVersion.VERSION_1_8
+    targetCompatibility JavaVersion.VERSION_1_8
+  }
+
+  sourceSets {
+    main {
+      if (isNewArchitectureEnabled()) {
+        java.srcDirs += [
+          // React Codegen files
+          "${project.buildDir}/generated/source/codegen/java"
+        ]
+      }
+    }
+  }
+}
+
+repositories {
+  mavenCentral()
+  google()
+}
+
+
+dependencies {
+  // For < 0.71, this will be from the local maven repo
+  // For > 0.71, this will be replaced by `com.facebook.react:react-android:$version` by react gradle plugin
+  //noinspection GradleDynamicVersion
+  implementation "com.facebook.react:react-native:+"
+
+  // Add a dependency on NitroModules
+  implementation project(":react-native-nitro-modules")
+}
+
+if (isNewArchitectureEnabled()) {
+  react {
+    jsRootDir = file("../src/")
+    libraryName = "Omni"
+    codegenJavaPackageName = "com.omni"
+  }
+}

android/fix-prefab.gradle

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+tasks.configureEach { task ->
+  // Make sure that we generate our prefab publication file only after having built the native library
+  // so that not a header publication file, but a full configuration publication will be generated, which
+  // will include the .so file
+
+  def prefabConfigurePattern = ~/^prefab(.+)ConfigurePackage$/
+  def matcher = task.name =~ prefabConfigurePattern
+  if (matcher.matches()) {
+    def variantName = matcher[0][1]
+    task.outputs.upToDateWhen { false }
+    task.dependsOn("externalNativeBuild${variantName}")
+  }
+}
+
+afterEvaluate {
+  def abis = reactNativeArchitectures()
+  rootProject.allprojects.each { proj ->
+    if (proj === rootProject) return
+
+    def dependsOnThisLib = proj.configurations.findAll { it.canBeResolved }.any { config ->
+      config.dependencies.any { dep ->
+        dep.group == project.group && dep.name == project.name
+      }
+    }
+    if (!dependsOnThisLib && proj != project) return
+
+    if (!proj.plugins.hasPlugin('com.android.application') && !proj.plugins.hasPlugin('com.android.library')) {
+      return
+    }
+
+    def variants = proj.android.hasProperty('applicationVariants') ? proj.android.applicationVariants : proj.android.libraryVariants
+    // Touch the prefab_config.json files to ensure that in ExternalNativeJsonGenerator.kt we will re-trigger the prefab CLI to
+    // generate a libnameConfig.cmake file that will contain our native library (.so).
+    // See this condition: https://cs.android.com/android-studio/platform/tools/base/+/mirror-goog-studio-main:build-system/gradle-core/src/main/java/com/android/build/gradle/tasks/ExternalNativeJsonGenerator.kt;l=207-219?q=createPrefabBuildSystemGlue
+    variants.all { variant ->
+      def variantName = variant.name
+      abis.each { abi ->
+        def searchDir = new File(proj.projectDir, ".cxx/${variantName}")
+        if (!searchDir.exists()) return
+        def matches = []
+        searchDir.eachDir { randomDir ->
+          def prefabFile = new File(randomDir, "${abi}/prefab_config.json")
+          if (prefabFile.exists()) matches << prefabFile
+        }
+        matches.each { prefabConfig ->
+          prefabConfig.setLastModified(System.currentTimeMillis())
+        }
+      }
+    }
+  }
+}

android/gradle.properties

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+Omni_kotlinVersion=2.1.20
+Omni_minSdkVersion=23
+Omni_targetSdkVersion=35
+Omni_compileSdkVersion=34
+Omni_ndkVersion=27.1.12297006

android/src/main/AndroidManifest.xml

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+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+</manifest>

android/src/main/cpp/cpp-adapter.cpp

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+#include <jni.h>
+#include <fbjni/fbjni.h>
+#include "OmniOnLoad.hpp"
+
+JNIEXPORT jint JNICALL JNI_OnLoad(JavaVM* vm, void*) {
+  return facebook::jni::initialize(vm, []() {
+    margelo::nitro::omni::registerAllNatives();
+  });
+}

android/src/main/java/com/omni/HybridOmni.kt

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+package com.omni
+
+import android.graphics.Color
+import android.view.View
+import androidx.annotation.Keep
+import com.facebook.proguard.annotations.DoNotStrip
+import com.facebook.react.uimanager.ThemedReactContext
+import com.margelo.nitro.omni.HybridOmniSpec
+
+@Keep
+@DoNotStrip
+class HybridOmni(val context: ThemedReactContext): HybridOmniSpec() {
+    // View
+    override val view: View = View(context)
+
+    // Props
+    private var _isRed = false
+    override var isRed: Boolean
+        get() = _isRed
+        set(value) {
+            _isRed = value
+            view.setBackgroundColor(
+                if (value) Color.RED
+                else Color.BLACK
+            )
+        }
+}

android/src/main/java/com/omni/OmniPackage.kt

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+package com.omni;
+
+import com.facebook.react.bridge.NativeModule;
+import com.facebook.react.bridge.ReactApplicationContext;
+import com.facebook.react.module.model.ReactModuleInfoProvider;
+import com.facebook.react.BaseReactPackage;
+import com.facebook.react.uimanager.ViewManager;
+import com.margelo.nitro.omni.*;
+import com.margelo.nitro.omni.views.*;
+
+
+public class OmniPackage : BaseReactPackage() {
+  override fun getModule(name: String, reactContext: ReactApplicationContext): NativeModule? = null
+
+  override fun getReactModuleInfoProvider(): ReactModuleInfoProvider = ReactModuleInfoProvider { emptyMap() }
+  
+  override fun createViewManagers(reactContext: ReactApplicationContext): List<ViewManager<*, *>> {
+    val viewManagers = ArrayList<ViewManager<*, *>>()
+    viewManagers.add(HybridOmniManager())
+    return viewManagers
+  }
+
+  companion object {
+    init {
+      OmniOnLoad.initializeNative()
+    }
+  }
+}
+