x86_64: android uses different architectures depending on the actual target. We have managed to make it run, then make it better (similar to Make it work, make it right, make it fast). Placing the native resources at the right place is extremely important. See FAQ: One architecture only Placing the native resources To speed up the process, compile for one architecture only. To diagnose the failures, see FAQ: debugging ndk-build LOCAL_C_INCLUDES += $(LOCAL_PATH)/./jni/include # The header files should be located in the following dir relative to jni/ dir LOCAL_SRC_FILES := $(TARGET_ARCH_ABI)/libsodium.a Note: for more information on ndk-build, see FAQ: ndk-buildwĬonfigure Android.mk: LOCAL_PATH := $(call my-dir) A guide on JNI can be found on Packaging the libraryĬonfigure the build to use JNI libraries:Īndroid This is done through the Java Native Interface (JNI). We have found it easier to import a dynamic library.Īfter importing the library, we need to yield the control to the native code. Ndk-build is a set of scripts for invoking Make 3.Īndroid imports libraries via the System.loadLibrary function 4. To build code with NDK, there are three ways: ndk-build, cmake, standalone toolchains 1. Intel architecture.Īndroid’s developers (Google) have built a tool called NDK (Native Development Kit) to integrate C/C++ code in your application. This library provides an upgrade in performance over using a JVM library.įor this particular example, we’re showcasing how to integrate libsodium, but this can be expanded to any other library. We have created an Android application, that is using a native C library. The library is written in C (not C++), the application in Kotlin. For a client, we needed to integrate a pure C library into an android application.
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