vcpkg/docs/specifications/prefab.md
Pascal Thomet 55be137d5b
[vcpkg] Improve Android doc (triplets, usage with cmake and prefab) (#11264)
* Android: add docs/examples/vcpkg_android_example_cmake/

* Add docs/users/android.md

* Improve Android prefab doc

Following additional informations given by @atkawa7 at
https://github.com/microsoft/vcpkg/pull/11264

* Link to android.md
* Update the prefab usage instructions: "vcpkg install"
    the 4 archs before exporting a prefab
* added --prefab-debug flag
* added gradle integration info
* reviewed the prefab output directory structure
  (from a dump of an actual export)

* docs/users/triplets.md: link to android.md

* docs/index.md: link to android.md

* android.md: specify 2 possibiities for android_ndk_home

* Added examples/vcpkg_android_example_cmake_script/cmake/vcpkg_android.cmake

Usage:

1. Main CMakeLists:
  if (VCPKG_TARGET_ANDROID)
      include("cmake/vcpkg_android.cmake")
  endif()

2. cmake invocation:
  cmake .. -DVCPKG_TARGET_ANDROID=ON -DANDROID_ABI=armeabi-v7a

* trigger pipeline build

* trigger pipelines
2020-05-13 16:42:13 -07:00

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5.3 KiB
Markdown

# Vcpkg: export Android prefab Archives (AAR files)
Vcpkg can export android archives ([AAR files](https://developer.android.com/studio/projects/android-library)). Once an archive is created, it can imported in Android Studio as a native dependent. The archive is automatically consumed using [android studio's prefab tool](https://github.com/google/prefab).
For more information on Prefab, refer to:
* The [official prefab documentation](https://google.github.io/prefab).
* a blog post from Android developers blog: [Native Dependencies in Android Studio 4.0](https://android-developers.googleblog.com/2020/02/native-dependencies-in-android-studio-40.html)
_Note for Android Studio users: prefab packages are supported on Android Studio 4+_
## Requirements
1. `ndk <required>`
Set environment variable `ANDROID_NDK_HOME` to your android ndk installation. For example:
````
export ANDROID_NDK_HOME=/home/your-account/Android/Sdk/ndk-bundle
````
2. `7zip <required on windows>` or `zip <required on linux>`
3. `maven <optional>`
4. Android triplets
See [android.md](../users/android.md) for instructions on how to install the triplets.
*Please note that in order to use "prefab" (see below), the four architectures are required. If any is missing the export will fail*
## Example exporting [jsoncpp]
First "vcpkg install" the 4 android architectures (it is mandatory to export all 4 of them)
````
./vcpkg install jsoncpp:arm-android jsoncpp:arm64-android jsoncpp:x64-android jsoncpp:x86-android
````
Then, export the prefab:
Note:
* The `--prefab-maven` flag is optional. Call it if you maven is installed.
* The `--prefab-debug` flag will output instructions on how to use the prefab archive via gradle.
```
./vcpkg export --triplet x64-android jsoncpp --prefab --prefab-maven --prefab-debug
```
You will see an ouput like this:
```
The following packages are already built and will be exported:
jsoncpp:arm64-android
Exporting package jsoncpp...
[DEBUG] Found 4 triplets
arm64-android
x64-android
x86-android
arm-android
...
... Lots of output...
...
[INFO] Scanning for projects...
Downloading from central: https://repo.maven.apache.org/maven2/org/apache/maven/plugins/maven-clean-plugin/2.5/maven-clean-plugin-2.5.pom
...
... Lots of output...
...
[INFO] BUILD SUCCESS
[INFO] Total time: 2.207 s
[INFO] Finished at: 2020-05-10T14:42:28+02:00
...
... Lots of output...
...
[DEBUG] Configuration properties in Android Studio
In app/build.gradle
com.vcpkg.ndk.support:jsoncpp:1.9.2
And cmake flags
externalNativeBuild {
cmake {
arguments '-DANDROID_STL=c++_shared'
cppFlags "-std=c++17"
}
}
In gradle.properties
android.enablePrefab=true
android.enableParallelJsonGen=false
android.prefabVersion=${prefab.version}
Successfuly exported jsoncpp. Checkout .../vcpkg/prefab
```
#### The output directory after export
````
prefab
└── jsoncpp/
├── aar/
│   ├── AndroidManifest.xml
│   ├── META-INF/
│   │   └── LICENSE
│   └── prefab/
│   ├── modules/
│   │   └── jsoncpp/
│   │   ├── libs/
│   │   │   ├── android.arm64-v8a/
│   │   │   │   ├── abi.json
│   │   │   │   ├── include/
│   │   │   │   │   └── json/
│   │   │   │   │   ├── json.h
│   │   │   │   │   └── ....
│   │   │   │   └── libjsoncpp.so
│   │   │   ├── android.armeabi-v7a/
│   │   │   │   ├── abi.json
│   │   │   │   ├── include/
│   │   │   │   │   └── json/
│   │   │   │   │   ├── json.h
│   │   │   │   │   └── ....
│   │   │   │   └── libjsoncpp.so
│   │   │   ├── android.x86/
│   │   │   │   ├── abi.json
│   │   │   │   ├── include/
│   │   │   │   │   └── json/
│   │   │   │   │   ├── json.h
│   │   │   │   │   └── ....
│   │   │   │   └── libjsoncpp.so
│   │   │   └── android.x86_64/
│   │   │   ├── abi.json
│   │   │   ├── include/
│   │   │   │   └── json/
│   │   │   │   │   ├── json.h
│   │   │   │   │   └── ....
│   │   │   └── libjsoncpp.so
│   │   └── module.json
│   └── prefab.json
├── jsoncpp-1.9.2.aar
└── pom.xml
````
## Example consuming [jsoncpp] via vcpkg and prefab
See the example repo here:
https://github.com/atkawa7/prefab-vpkg-integration-sample