realm-js/react-native/android/app/build.gradle

// Copyright 2015-present Facebook. All Rights Reserved.

apply plugin: 'com.android.library'
apply plugin: 'maven'

apply plugin: 'de.undercouch.download'

import de.undercouch.gradle.tasks.download.Download
import org.apache.tools.ant.taskdefs.condition.Os
import org.apache.tools.ant.filters.ReplaceTokens

// We download various C++ open-source dependencies into downloads.
// We then copy both the downloaded code and our custom makefiles and headers into third-party-ndk.
// After that we build native code from src/main/jni with module path pointing at third-party-ndk.

def downloadsDir = new File("$buildDir/downloads")
def jscDownloadDir = new File("$projectDir/src/main/jni/jsc")
def coreDownloadDir = new File("$projectDir/src/main/jni")
ext.coreVersion = '0.95.6'
def thirdPartyNdkDir = new File("$buildDir/third-party-ndk")


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

task downloadJSCHeaders(type: Download) {
     def jscAPIBaseURL = 'https://svn.webkit.org/repository/webkit/!svn/bc/174650/trunk/Source/JavaScriptCore/API/'
     def jscHeaderFiles = ['JSBase.h', 'JSContextRef.h', 'JSObjectRef.h', 'JSRetainPtr.h', 'JSStringRef.h', 'JSValueRef.h', 'WebKitAvailability.h']

     def output = new File(jscDownloadDir, 'JavaScriptCore')
     output.mkdirs()
     src(jscHeaderFiles.collect { headerName -> "$jscAPIBaseURL$headerName" })
     onlyIfNewer true
     overwrite false
     dest output
 }

task downloadRealmCore(type: Download) {
    src "http://static.realm.io/downloads/core/realm-core-android-${project.coreVersion}.tar.gz"
    onlyIfNewer true
    overwrite false
    dest new File(downloadsDir, "realm-core-android-${project.coreVersion}.tar.gz")
}

task prepareRealmCore(dependsOn: downloadRealmCore, type:Copy) {
    from tarTree(downloadRealmCore.dest)
    into "$coreDownloadDir/core"
    //Fixing Core file naming 'arm-*' to 'armeabi-*'
    doLast {
      exec {
        workingDir = "$coreDownloadDir/core"
            commandLine = [
                    "bash",
                    "-c",
                    "find . -name \"*-arm-*\" -exec sh -c \"echo {} | sed -e s/arm/armeabi/g | xargs mv {} \" \\;"
            ]
      }
    }
}


def getNdkBuildName() {
    if (Os.isFamily(Os.FAMILY_WINDOWS)) {
        return "ndk-build.cmd"
    } else {
        return "ndk-build"
    }
}

def findNdkBuildFullPath() {
    // we allow to provide full path to ndk-build tool
    if (hasProperty('ndk.command')) {
        return property('ndk.command')
    }
    // or just a path to the containing directory
    if (hasProperty('ndk.path')) {
        def ndkDir = property('ndk.path')
        return new File(ndkDir, getNdkBuildName()).getAbsolutePath()
    }
    if (System.getenv('ANDROID_NDK') != null) {
        def ndkDir = System.getenv('ANDROID_NDK')
        return new File(ndkDir, getNdkBuildName()).getAbsolutePath()
    }
    def ndkDir = android.hasProperty('plugin') ? android.plugin.ndkFolder :
            plugins.getPlugin('com.android.library').sdkHandler.getNdkFolder()
    if (ndkDir) {
        return new File(ndkDir, getNdkBuildName()).getAbsolutePath()
    }
    return null
}

def getNdkBuildFullPath() {
    def ndkBuildFullPath = findNdkBuildFullPath()
    if (ndkBuildFullPath == null) {
        throw new GradleScriptException(
            "ndk-build binary cannot be found, check if you've set " +
            "\$ANDROID_NDK environment variable correctly or if ndk.dir is " +
            "setup in local.properties",
            null)
    }
    if (!new File(ndkBuildFullPath).canExecute()) {
        throw new GradleScriptException(
            "ndk-build binary " + ndkBuildFullPath + " doesn't exist or isn't executable.\n" +
            "Check that the \$ANDROID_NDK environment variable, or ndk.dir in local.proerties, is set correctly.\n" +
            "(On Windows, make sure you escape backslashes in local.properties or use forward slashes, e.g. C:\\\\ndk or C:/ndk rather than C:\\ndk)",
            null)
    }
    return ndkBuildFullPath
}

task buildReactNdkLib(dependsOn: [downloadJSCHeaders,prepareRealmCore], type: Exec) {
    inputs.file('src/main/jni')
    outputs.dir("$buildDir/react-ndk/all")
    commandLine getNdkBuildFullPath(),
            'NDK_PROJECT_PATH=null',
            "NDK_APPLICATION_MK=$projectDir/src/main/jni/Application.mk",
            'NDK_OUT=' + temporaryDir,
            "NDK_LIBS_OUT=$buildDir/react-ndk/all",
            "THIRD_PARTY_NDK_DIR=$buildDir/third-party-ndk",
            '-C', file('src/main/jni').absolutePath,
            'NDK_LOG=1',
            'NDK_DEBUG=1',
            '--jobs', Runtime.runtime.availableProcessors(),
            'V=1'
}

task cleanReactNdkLib(type: Exec) {
    commandLine getNdkBuildFullPath(),
            '-C', file('src/main/jni').absolutePath,
            'clean'
}

task packageReactNdkLibs(dependsOn: buildReactNdkLib, type: Copy) {
    from "$buildDir/react-ndk/all"
    exclude '**/libjsc.so'
    into "$buildDir/react-ndk/exported"
}

android {
    compileSdkVersion 23
    buildToolsVersion "23.0.1"

    defaultConfig {
        minSdkVersion 16
        targetSdkVersion 22
        versionCode 1
        versionName "1.0"
    }

    sourceSets.main {
        jni.srcDirs = []
        jniLibs.srcDir "$buildDir/react-ndk/exported"
        res.srcDirs = ['src/main/res/devsupport', 'src/main/res/shell']
    }

    tasks.withType(JavaCompile) {
        compileTask -> compileTask.dependsOn packageReactNdkLibs
    }

    clean.dependsOn cleanReactNdkLib

    lintOptions {
        abortOnError false
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'org.nanohttpd:nanohttpd:2.2.0'
    compile 'com.facebook.react:react-native:0.18.0-patched'
}

apply from: 'release.gradle'