jmonkeyengine/jme3-android-native/build.gradle

// Note: "common.gradle" in the root project contains additional initialization
//   for this project. This initialization is applied in the "build.gradle"
//   of the root project.

// NetBeans will automatically add "run" and "debug" tasks relying on the
// "mainClass" property. You may however define the property prior executing
// tasks by passing a "-PmainClass=<QUALIFIED_CLASS_NAME>" argument.
//
// Note however, that you may define your own "run" and "debug" task if you
// prefer. In this case NetBeans will not add these tasks but you may rely on
// your own implementation.
// // OpenAL Soft r1.15.1
//String openALSoftUrl = 'http://repo.or.cz/w/openal-soft.git/snapshot/9b6a226da55a987cb883f425eeb568776ea12c8d.zip'
// OpenAL Soft r1.15.1 + Android OpenSL Support
String openALSoftUrl = 'http://repo.or.cz/w/openal-soft.git/snapshot/be25e6802dacad78876c6fa1d6a5c63797b8a9ed.zip'
// OpenAL Soft r1.15.1 latest build (at the time)
//String openALSoftUrl = 'http://repo.or.cz/w/openal-soft.git/snapshot/3f5914e0949ee12b504ee7254990e007ff8057ef.zip'

// OpenAL Soft directory the download is extracted into
// Typically, the downloaded OpenAL Soft zip file will extract to a directory
// called "openal-soft"
String openALSoftFolder = 'openal-soft'
String openALSoftZipFile = 'OpenALSoft.zip'

//Working directory for the ndk build.
//Must be the parent directory of the jni directory
//Libs directory (output of ndk) will be created in this directory as well
String ndkWorkingPath = 'src/native'

// jni folder path to build from
String jniPath = ndkWorkingPath + '/jni'

//Output directory of the NDK (do not change)
String ndkOutputPath = ndkWorkingPath + '/libs'

// jME Android Native source files path
String jMEAndroidPath = 'src/native/android'

if (!hasProperty('mainClass')) {
    ext.mainClass = ''
}

sourceSets {
    main {
        java {
            srcDir jMEAndroidPath
        }
    }
}

dependencies {
    // TODO: Add dependencies here
    //   but note that JUnit should have already been added in parent.gradle.
    //   By default, only the Maven Central Repository is specified in
    //   parent.gradle.
    //
    // You can read more about how to add dependency here:
    //   http://www.gradle.org/docs/current/userguide/dependency_management.html#sec:how_to_declare_your_dependencies
    compile project(':jme3-android')
}

// Download bullet if not available
task downloadOpenALSoft(type: MyDownload) {
    sourceUrl = openALSoftUrl
    target = file(openALSoftZipFile)
}

// Unzip OpenALSoft
task unzipOpenALSoft(type: Copy) {
    def zipFile = file(openALSoftZipFile)
    def outputDir = file(".")

    from zipTree(zipFile)
    into outputDir
}
unzipOpenALSoft.dependsOn {
    def zipFilePath = project.projectDir.absolutePath + File.separator + openALSoftZipFile
    def zipFile = new File(zipFilePath)
//    println "zipFile path: " + zipFile.absolutePath
//    println "zipFile exists: " + zipFile.exists()
    if (!zipFile.exists()) {
        downloadOpenALSoft
    }
}

// Copy OpenALSoft files to jni directory
task copyOpenALSoft(type: Copy) {
    def sourceDir = file(openALSoftFolder)
    def outputDir = file(jniPath)

    from sourceDir
    into outputDir
}
copyOpenALSoft.dependsOn {
    def openALSoftUnzipDir = new File(project.projectDir.absolutePath + File.separator + openALSoftFolder)
//    println "openALSoftUnzipDir path: " + openALSoftUnzipDir.absolutePath
//    println "openALSoftUnzipDir exists: " + openALSoftUnzipDir.isDirectory()
    if (!openALSoftUnzipDir.isDirectory()) {
        unzipOpenALSoft
    }
}

// Copy jME Android native files to jni directory
task copyJmeOpenALSoft(type: Copy, dependsOn:copyOpenALSoft) {
    def sourceDir = file(jMEAndroidPath)
    def outputDir = file(jniPath)

    from sourceDir
    into outputDir
}

task buildNative(type: Exec, dependsOn:copyJmeOpenALSoft) {
    String ndkBuildFile = "ndk-build"
    // if windows, use ndk-build.cmd instead
    if (System.properties['os.name'].toLowerCase().contains('windows')) {
        ndkBuildFile = "ndk-build.cmd"
    }

    // ndkPath is defined in the root project gradle.properties file
    String ndkBuildPath = ndkPath + File.separator + ndkBuildFile
    //Use the environment variable for the NDK location if defined
    if (System.env.ANDROID_NDK != null) {
        ndkBuildPath = System.env.ANDROID_NDK + File.separator + ndkBuildFile
    }

    // need to target android-9 so the ndk can pull in the opensl library
    args 'TARGET_PLATFORM=android-9'
    workingDir ndkWorkingPath
    executable ndkBuildPath
}

jar.into("lib") { from ndkOutputPath }

compileJava.dependsOn {
    // ndkPath is defined in the root project gradle.properties file
    def ndkDir = new File(ndkPath)
    if (ndkDir.isDirectory()) {
        buildNative
    }
}

// Helper class to wrap ant dowload task
class MyDownload extends DefaultTask {
    @Input
    String sourceUrl

    @OutputFile
    File target

    @TaskAction
    void download() {
       ant.get(src: sourceUrl, dest: target)
    }
}