NdkBuild

interface NdkBuild

DSL object for per-module ndk-build configurations, such as the path to your Android.mk build script and external native build output directory.

To include ndk-build projects in your Gradle build, you need to use Android Studio 2.2 and higher with Android plugin for Gradle 2.2.0 and higher. To learn more about Android Studio's support for external native builds, read Add C and C++ Code to Your Project

If you want to instead build your native libraries using CMake, see Cmake

Summary

Public functions
Unit

Specifies the path to your external native build output directory.
Unit
path(any: Any)

Specifies the relative path to your Android.mk build script.

Public properties
File?

Specifies the path to your external native build output directory.
File?

Specifies the relative path to your Android.mk build script.

Public functions

buildStagingDirectory

fun buildStagingDirectory(any: Any): Unit

Specifies the path to your external native build output directory.

If you do not specify a value for this property, the Android plugin uses the <project_dir>/.cxx/ directory by default.

If you specify a path that does not exist, the Android plugin creates it for you. Relative paths are relative to the build.gradle file, as shown below:

android {
    externalNativeBuild {
        ndkBuild {
            // Tells Gradle to put outputs from external native
            // builds in the path specified below.
            buildStagingDirectory "./outputs/ndk-build"
        }
    }
}

If you specify a path that's a subdirectory of your project's temporary build directory, you get a build error. That's because files in this directory do not persist through clean builds. So, you should either keep using the default <project_dir>/.cxx/ directory or specify a path outside the temporary build directory.

since 4.0.0

path

fun path(any: Any): Unit

Specifies the relative path to your Android.mk build script.

For example, if your ndk-build script is in the same folder as your project-level build.gradle file, you simply pass the following:

android {
    externalNativeBuild {
        ndkBuild {
            // Tells Gradle to find the root ndk-build script in the same
            // directory as the project's build.gradle file. Gradle requires this
            // build script to add your ndk-build project as a build dependency and
            // pull your native sources into your Android project.
            path "Android.mk"
        }
    }
}

since 4.0.0

Public properties

buildStagingDirectory

var buildStagingDirectory: File?

Specifies the path to your external native build output directory.

If you do not specify a value for this property, the Android plugin uses the <project_dir>/.cxx/ directory by default.

If you specify a path that does not exist, the Android plugin creates it for you. Relative paths are relative to the build.gradle file, as shown below:

android {
    externalNativeBuild {
        ndkBuild {
            // Tells Gradle to put outputs from external native
            // builds in the path specified below.
            buildStagingDirectory "./outputs/ndk-build"
        }
    }
}

If you specify a path that's a subdirectory of your project's temporary build directory, you get a build error. That's because files in this directory do not persist through clean builds. So, you should either keep using the default <project_dir>/.cxx/ directory or specify a path outside the temporary build directory.

since 3.0.0

path

var path: File?

Specifies the relative path to your Android.mk build script.

For example, if your ndk-build script is in the same folder as your project-level build.gradle file, you simply pass the following:

android {
    externalNativeBuild {
        ndkBuild {
            // Tells Gradle to find the root ndk-build script in the same
            // directory as the project's build.gradle file. Gradle requires this
            // build script to add your ndk-build project as a build dependency and
            // pull your native sources into your Android project.
            path "Android.mk"
        }
    }
}

since 2.2.0