![]() On the input, it takes a public section of C++ header files, and on the output generates C++/JNI and Java files which can be included into the project and interlanguage interaction becomes seamless. ![]() SWIG is a tool for generating a JNI layer between Java and C++ automatically, based on the set of rules. If you are known with SWIG, you can jump to the next section. That's why we are using SWIG, which automizes the process to generate JNI boilerplate code. JNI is a low-level tool and most of the JNI code is not checkable by the compiler - we will know about the error only in the runtime. In any case, just check the article and note how many JNI code is required to use Java array or to call a simple method. You can read more about the basic C++ usage in Android here. Then you load your library dynamically in Java code: public class MainActivity extends AppCompatActivityĪnd now you can use the C++ code through JNI. * All paths here and later are relative to the Android Studio project root. Rules to build your C++ code into a library which will be packaged into your APK (app/src/main/cpp/CMakeLists.txt) In short, except for the standard project structure for Java, your new project includes the:įile with C++ code (app/src/main/cpp/native-lib.cpp) Now you've got a simple project template, which includes C++ code. *You can use Kotlin, no difference using SWIG. The versions are given at the moment of writing this article.Ĭreate new Android Studio project: File -> New -> New Project -> Select "Native C++" -> Chose project parameters and location, use Java* language -> Press "Finish". ![]() Add SWIG to your PATH environment variable. Install the latest Android Studio (3.5.3), then the latest NDK (using Android Studio SDK manager), and the latest SWIG tool (4.0.1). While SWIG is more suitable to connect the C++ library or existing C++ application core.Ĭalling C++ from Java. If you are developing a new application it is much more cost-efficient in practice to use ReactNative, Flutter of Kotlin-Native than the SWIG. Warning! I should warn you, that nowadays cross-platform development offers powerful tools. Of course, all the information given here applies to any Java application. While this guide includes an Android Studio project, with which you can play around instantly. There are many articles about SWIG, but they are mainly for desktop Java applications, and it is quite an overhead to just try them on Android to check if the solution for the particular problem is working. The goal was to make it simple to onboard for Android developers. The link to the Android Studio project is here. This guide allows you to quick-start an Android Studio project and giving practical examples of using SWIG. The bits developed by myself while working on the different projects or taken from StackOverflow. In opposition to overcomplicated huge-volume SWIG documentation, this guide is showing the cases practically. The latter cases are not so complex, rather usual for modern languages, which SWIG doesn't support yet (as lambdas). I'm starting from basic setup and usage and ending with complex & weird cases encountered in development. This guide is for newbies (Part 1) and for those who experienced in SWIG ( part 2). SWIG just simplifies and automizes cross-language interaction otherwise, you may end up with thousands of lines of handwritten JNI code - but SWIG covers this for you. SWIG is a tool for generating cross-language interfaces - it provides interoperability of C++ and other languages (C++ and Java in our case).
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