react-native-vision-camera/android/build.gradle

import groovy.json.JsonSlurper
import org.apache.tools.ant.filters.ReplaceTokens
import java.nio.file.Paths

def reactNative = new File("$projectDir/../node_modules/react-native")

def FOR_HERMES = System.getenv("FOR_HERMES") == "True";
rootProject.getSubprojects().forEach({project ->
  if (project.plugins.hasPlugin("com.android.application")) {
    FOR_HERMES = project.ext.react.enableHermes;
  }
})

/**
 * Finds the path of the installed npm package with the given name using Node's
 * module resolution algorithm, which searches "node_modules" directories up to
 * the file system root. This handles various cases, including:
 *
 *   - Working in the open-source RN repo:
 *       Gradle: /path/to/react-native/ReactAndroid
 *       Node module: /path/to/react-native/node_modules/[package]
 *
 *   - Installing RN as a dependency of an app and searching for hoisted
 *     dependencies:
 *       Gradle: /path/to/app/node_modules/react-native/ReactAndroid
 *       Node module: /path/to/app/node_modules/[package]
 *
 *   - Working in a larger repo (e.g., Facebook) that contains RN:
 *       Gradle: /path/to/repo/path/to/react-native/ReactAndroid
 *       Node module: /path/to/repo/node_modules/[package]
 *
 * The search begins at the given base directory (a File object). The returned
 * path is a string.
 */
static def findNodeModulePath(baseDir, packageName) {
  def basePath = baseDir.toPath().normalize()
  // Node's module resolution algorithm searches up to the root directory,
  // after which the base path will be null
  while (basePath) {
    def candidatePath = Paths.get(basePath.toString(), "node_modules", packageName)
    if (candidatePath.toFile().exists()) {
      return candidatePath.toString()
    }
    basePath = basePath.getParent()
  }
  return null
}

buildscript {
  // Buildscript is evaluated before everything else so we can't use getExtOrDefault
  def kotlin_version = rootProject.ext.has('kotlinVersion') ? rootProject.ext.get('kotlinVersion') : project.properties['VisionCamera_kotlinVersion']

  repositories {
    google()
    jcenter()
    maven {
      url "https://plugins.gradle.org/m2/"
    }
  }

  dependencies {
    classpath 'com.android.tools.build:gradle:4.2.1'
    classpath 'de.undercouch:gradle-download-task:4.1.2'
    // noinspection DifferentKotlinGradleVersion
    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
    classpath "org.jetbrains.kotlin:kotlin-android-extensions:$kotlin_version"
  }
}

apply plugin: 'com.android.library'
apply plugin: 'de.undercouch.download'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-android-extensions'

def getExtOrDefault(name) {
  return rootProject.ext.has(name) ? rootProject.ext.get(name) : project.properties['VisionCamera_' + name]
}

def getExtOrIntegerDefault(name) {
  return rootProject.ext.has(name) ? rootProject.ext.get(name) : (project.properties['VisionCamera_' + name]).toInteger()
}

android {
  compileSdkVersion getExtOrIntegerDefault('compileSdkVersion')
  buildToolsVersion getExtOrDefault('buildToolsVersion')
  ndkVersion getExtOrDefault('ndkVersion')

  defaultConfig {
    minSdkVersion 21
    targetSdkVersion getExtOrIntegerDefault('targetSdkVersion')

    externalNativeBuild {
      cmake {
        cppFlags "-fexceptions", "-frtti", "-std=c++1y", "-DONANDROID"
        abiFilters 'x86', 'x86_64', 'armeabi-v7a', 'arm64-v8a'
        arguments '-DANDROID_STL=c++_shared',
                "-DNODE_MODULES_DIR=${rootDir}/../node_modules",
                "-DFOR_HERMES=${FOR_HERMES}"
      }
    }
  }

  dexOptions {
    javaMaxHeapSize "4g"
  }

  externalNativeBuild {
    cmake {
      path "CMakeLists.txt"
    }
  }

  packagingOptions {
    excludes = ["**/libc++_shared.so"]
  }

  buildTypes {
    release {
      minifyEnabled false
    }
  }

  lintOptions {
    disable 'GradleCompatible'
  }
  compileOptions {
    sourceCompatibility JavaVersion.VERSION_1_8
    targetCompatibility JavaVersion.VERSION_1_8
  }

  configurations {
    extractHeaders
    extractJNI
  }
}

repositories {
  mavenCentral()
  jcenter()
  google()

  def found = false
  def defaultDir = null
  def androidSourcesName = 'React Native sources'

  if (rootProject.ext.has('reactNativeAndroidRoot')) {
    defaultDir = rootProject.ext.get('reactNativeAndroidRoot')
  } else {
    defaultDir = new File(
            projectDir,
            '/../../../node_modules/react-native/android'
    )
  }

  if (defaultDir.exists()) {
    maven {
      url defaultDir.toString()
      name androidSourcesName
    }

    logger.info(":${project.name}:reactNativeAndroidRoot ${defaultDir.canonicalPath}")
    found = true
  } else {
    def parentDir = rootProject.projectDir

    1.upto(5, {
      if (found) return true
      parentDir = parentDir.parentFile

      def androidSourcesDir = new File(
              parentDir,
              'node_modules/react-native'
      )

      def androidPrebuiltBinaryDir = new File(
              parentDir,
              'node_modules/react-native/android'
      )

      if (androidPrebuiltBinaryDir.exists()) {
        maven {
          url androidPrebuiltBinaryDir.toString()
          name androidSourcesName
        }

        logger.info(":${project.name}:reactNativeAndroidRoot ${androidPrebuiltBinaryDir.canonicalPath}")
        found = true
      } else if (androidSourcesDir.exists()) {
        maven {
          url androidSourcesDir.toString()
          name androidSourcesName
        }

        logger.info(":${project.name}:reactNativeAndroidRoot ${androidSourcesDir.canonicalPath}")
        found = true
      }
    })
  }

  if (!found) {
    throw new GradleException(
            "${project.name}: unable to locate React Native android sources. " +
                    "Ensure you have you installed React Native as a dependency in your project and try again."
    )
  }
}

def kotlin_version = getExtOrDefault('kotlinVersion')

dependencies {
  // noinspection GradleDynamicVersion
  implementation 'com.facebook.react:react-native:+'
  implementation project(':react-native-reanimated')

  //noinspection GradleDynamicVersion
  extractHeaders("com.facebook.fbjni:fbjni:+:headers")
  //noinspection GradleDynamicVersion
  extractJNI("com.facebook.fbjni:fbjni:+")

  def rnAAR = fileTree("${rootDir}/../node_modules/react-native/android").matching({ it.include "**/**/*.aar" }).singleFile
  def jscAAR = fileTree("${rootDir}/../node_modules/jsc-android/dist/org/webkit/android-jsc").matching({ it.include "**/**/*.aar" }).singleFile

  def inputFile = new File(rootDir, '../node_modules/react-native/package.json')
  def json = new JsonSlurper().parseText(inputFile.text)
  def reactNativeVersion = json.version as String
  def (major, minor, patch) = reactNativeVersion.tokenize('.')

  def raAARJSC = "${rootDir}/../node_modules/react-native-reanimated/android/react-native-reanimated-${minor}-jsc.aar"
  def raAARHermes = "${rootDir}/../node_modules/react-native-reanimated/android/react-native-reanimated-${minor}-hermes.aar"

  extractJNI(files(rnAAR, jscAAR, raAARJSC, raAARHermes))

  implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-guava:1.5.0"
  implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.0"

  implementation "androidx.camera:camera-core:1.1.0-alpha06"
  implementation "androidx.camera:camera-camera2:1.1.0-alpha06"
  implementation "androidx.camera:camera-lifecycle:1.1.0-alpha06"
  implementation "androidx.camera:camera-extensions:1.0.0-alpha26"
  implementation "androidx.camera:camera-view:1.0.0-alpha26"
  implementation "androidx.exifinterface:exifinterface:1.3.2"
}

task extractAARHeaders {
  doLast {
    configurations.extractHeaders.files.each {
      def file = it.absoluteFile
      copy {
        from zipTree(file)
        into "$buildDir/$file.name"
        include "**/*.h"
      }
    }
  }
}

task extractJNIFiles {
  doLast {
    configurations.extractJNI.files.each {
      def file = it.absoluteFile

      copy {
        from zipTree(file)
        into "$buildDir/$file.name"
        include "jni/**/*"
      }
    }
  }
}

// third-party-ndk deps headers
// mostly a copy of https://github.com/software-mansion/react-native-reanimated/blob/master/android/build.gradle#L115

def downloadsDir = new File("$buildDir/downloads")
def thirdPartyNdkDir = new File("$buildDir/third-party-ndk")
def thirdPartyVersionsFile = new File("${rootDir}/../node_modules/react-native/ReactAndroid/gradle.properties")
def thirdPartyVersions = new Properties()
thirdPartyVersions.load(new FileInputStream(thirdPartyVersionsFile))

def BOOST_VERSION = thirdPartyVersions["BOOST_VERSION"]
def boost_file = new File(downloadsDir, "boost_${BOOST_VERSION}.tar.gz")
def DOUBLE_CONVERSION_VERSION = thirdPartyVersions["DOUBLE_CONVERSION_VERSION"]
def double_conversion_file = new File(downloadsDir, "double-conversion-${DOUBLE_CONVERSION_VERSION}.tar.gz")
def FOLLY_VERSION = thirdPartyVersions["FOLLY_VERSION"]
def folly_file = new File(downloadsDir, "folly-${FOLLY_VERSION}.tar.gz")
def GLOG_VERSION = thirdPartyVersions["GLOG_VERSION"]
def glog_file = new File(downloadsDir, "glog-${GLOG_VERSION}.tar.gz")

task createNativeDepsDirectories {
  downloadsDir.mkdirs()
  thirdPartyNdkDir.mkdirs()
}

task downloadBoost(dependsOn: createNativeDepsDirectories, type: Download) {
  src("https://github.com/react-native-community/boost-for-react-native/releases/download/v${BOOST_VERSION.replace("_", ".")}-0/boost_${BOOST_VERSION}.tar.gz")
  onlyIfNewer(true)
  overwrite(false)
  dest(boost_file)
}

task prepareBoost(dependsOn: downloadBoost, type: Copy) {
  from(tarTree(resources.gzip(downloadBoost.dest)))
  from("src/main/jni/third-party/boost/Android.mk")
  include("Android.mk", "boost_${BOOST_VERSION}/boost/**/*.hpp", "boost/boost/**/*.hpp")
  includeEmptyDirs = false
  into("$thirdPartyNdkDir") // /boost_X_XX_X
  doLast {
    file("$thirdPartyNdkDir/boost_${BOOST_VERSION}").renameTo("$thirdPartyNdkDir/boost")
  }
}

task downloadDoubleConversion(dependsOn: createNativeDepsDirectories, type: Download) {
  src("https://github.com/google/double-conversion/archive/v${DOUBLE_CONVERSION_VERSION}.tar.gz")
  onlyIfNewer(true)
  overwrite(false)
  dest(double_conversion_file)
}

task prepareDoubleConversion(dependsOn: downloadDoubleConversion, type: Copy) {
  from(tarTree(downloadDoubleConversion.dest))
  from("src/main/jni/third-party/double-conversion/Android.mk")
  include("double-conversion-${DOUBLE_CONVERSION_VERSION}/src/**/*", "Android.mk")
  filesMatching("*/src/**/*", { fname -> fname.path = "double-conversion/${fname.name}" })
  includeEmptyDirs = false
  into("$thirdPartyNdkDir/double-conversion")
}

task downloadFolly(dependsOn: createNativeDepsDirectories, type: Download) {
  src("https://github.com/facebook/folly/archive/v${FOLLY_VERSION}.tar.gz")
  onlyIfNewer(true)
  overwrite(false)
  dest(folly_file)
}

task prepareFolly(dependsOn: downloadFolly, type: Copy) {
  from(tarTree(downloadFolly.dest))
  from("src/main/jni/third-party/folly/Android.mk")
  include("folly-${FOLLY_VERSION}/folly/**/*", "Android.mk")
  eachFile { fname -> fname.path = (fname.path - "folly-${FOLLY_VERSION}/") }
  includeEmptyDirs = false
  into("$thirdPartyNdkDir/folly")
}

task downloadGlog(dependsOn: createNativeDepsDirectories, type: Download) {
  src("https://github.com/google/glog/archive/v${GLOG_VERSION}.tar.gz")
  onlyIfNewer(true)
  overwrite(false)
  dest(glog_file)
}

task prepareGlog(dependsOn: downloadGlog, type: Copy) {
  from(tarTree(downloadGlog.dest))
  from("src/main/jni/third-party/glog/")
  include("glog-${GLOG_VERSION}/src/**/*", "Android.mk", "config.h")
  includeEmptyDirs = false
  filesMatching("**/*.h.in") {
    filter(ReplaceTokens, tokens: [
            ac_cv_have_unistd_h           : "1",
            ac_cv_have_stdint_h           : "1",
            ac_cv_have_systypes_h         : "1",
            ac_cv_have_inttypes_h         : "1",
            ac_cv_have_libgflags          : "0",
            ac_google_start_namespace     : "namespace google {",
            ac_cv_have_uint16_t           : "1",
            ac_cv_have_u_int16_t          : "1",
            ac_cv_have___uint16           : "0",
            ac_google_end_namespace       : "}",
            ac_cv_have___builtin_expect   : "1",
            ac_google_namespace           : "google",
            ac_cv___attribute___noinline  : "__attribute__ ((noinline))",
            ac_cv___attribute___noreturn  : "__attribute__ ((noreturn))",
            ac_cv___attribute___printf_4_5: "__attribute__((__format__ (__printf__, 4, 5)))"
    ])
    it.path = (it.name - ".in")
  }
  into("$thirdPartyNdkDir/glog")

  doLast {
    copy {
      from(fileTree(dir: "$thirdPartyNdkDir/glog", includes: ["stl_logging.h", "logging.h", "raw_logging.h", "vlog_is_on.h", "**/src/glog/log_severity.h"]).files)
      includeEmptyDirs = false
      into("$thirdPartyNdkDir/glog/exported/glog")
    }
  }
}

task prepareHermes() {
  def hermesPackagePath = findNodeModulePath(projectDir, "hermes-engine")
  if (!hermesPackagePath) {
    throw new GradleScriptException("Could not find the hermes-engine npm package", null)
  }

  def hermesAAR = file("$hermesPackagePath/android/hermes-debug.aar")
  if (!hermesAAR.exists()) {
    throw new GradleScriptException("The hermes-engine npm package is missing \"android/hermes-debug.aar\"", null)
  }

  def soFiles = zipTree(hermesAAR).matching({ it.include "**/*.so" })

  copy {
    from soFiles
    from "$reactNative/ReactAndroid/src/main/jni/first-party/hermes/Android.mk"
    into "$thirdPartyNdkDir/hermes"
  }
}

task prepareJSC {
  doLast {
    def jscPackagePath = findNodeModulePath(projectDir, "jsc-android")
    if (!jscPackagePath) {
      throw new GradleScriptException("Could not find the jsc-android npm package", null)
    }

    def jscDist = file("$jscPackagePath/dist")
    if (!jscDist.exists()) {
      throw new GradleScriptException("The jsc-android npm package is missing its \"dist\" directory", null)
    }

    def jscAAR = fileTree(jscDist).matching({ it.include "**/android-jsc/**/*.aar" }).singleFile
    def soFiles = zipTree(jscAAR).matching({ it.include "**/*.so" })

    def headerFiles = fileTree(jscDist).matching({ it.include "**/include/*.h" })

    copy {
      from(soFiles)
      from(headerFiles)
      from("$reactNative/ReactAndroid/src/main/jni/third-party/jsc/Android.mk")

      filesMatching("**/*.h", { it.path = "JavaScriptCore/${it.name}" })

      includeEmptyDirs(false)
      into("$thirdPartyNdkDir/jsc")
    }
  }
}

task prepareThirdPartyNdkHeaders {
  if (!boost_file.exists()) {
    dependsOn(prepareBoost)
  }
  if (!double_conversion_file.exists()) {
    dependsOn(prepareDoubleConversion)
  }
  if (!folly_file.exists()) {
    dependsOn(prepareFolly)
  }
  if (!glog_file.exists()) {
    dependsOn(prepareGlog)
  }
}

// pre-native build pipeline

tasks.whenTaskAdded { task ->
  if (task.name.contains('externalNativeBuild')) {
    task.dependsOn(prepareJSC)
    task.dependsOn(prepareHermes)
    task.dependsOn(extractAARHeaders)
    task.dependsOn(extractJNIFiles)
    task.dependsOn(prepareThirdPartyNdkHeaders)
  }
}