This project has full examples of using Android Studio(s) 1, 2, and 3, Gradle, CMake, the Android NDK, and SWIG to automatically compile and setup C++ libraries and Java wrappers.
Explained in detail here: http://www.sureshjoshi.com/mobile/android-ndk-in-android-studio-with-swig/ (pending updates to include CMake)
Since Android Studio 2.2, CMake and the NDK have a higher status in the Android ecosystem, so Gradle hacks are no longer necessary. The only dependency is:
- SWIG - Which needs to be on your system path too, so CMake can pick it up
SWIG is setup in the CMakeLists.txt file, so you only need to setup the correct directories and source files.
A common problem with auto-generated code in CMake is that Android Studio will not run the CMake-related commands until AFTER it tries to search through all files. In this repo, that let to a failing build caused by a missing com.sureshjoshi.core package. The manual workaround was to call:
./gradle externalNativeBuildDebug
in the terminal to generate the missing C++ wrapper files.
Now, there is a Gradle hack which will call externalNativeBuild during Gradle's pre-compilation phase, which means that Swig is ALWAYS run before AS looks for Java files.
For information about junit testing native libraries, please refer to the feature branch "9-junit-native" which has a working implementation for OSx.
Here are the from-scratch build steps (if you were going to build in your home directory on Linux/Mac - similar for Windows, with slightly revised commands and locations):
cd ~/
git clone https://github.com/sureshjoshi/android-ndk-swig-example.git
[Open in Android Studio and let Gradle run and the project get indexed - this creates local.properties and the sdk.dir]
cd android-ndk-swig-example/NDKExample
./gradlew runSwig
(In Android Studio) Make Project
That should build error-free (assuming you’ve set up your ndk.dir in local.properties).
The dependencies are:
The MIT License (MIT)
Copyright (c) 2017 Suresh Joshi
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