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Commit 75d1bc8

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Merge pull request #9 from pramonow/sample_jni
Added sample for jni kotlin
2 parents c6a8356 + 7b8036c commit 75d1bc8

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‎JniSample/.gitignore

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*.iml
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.gradle
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/local.properties
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/.idea/caches/build_file_checksums.ser
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/.idea/libraries
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/.idea/modules.xml
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/.idea/workspace.xml
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.DS_Store
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/build
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/captures
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.externalNativeBuild

‎JniSample/.idea/codeStyles/Project.xml

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‎JniSample/.idea/codeStyles/codeStyleConfig.xml

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‎JniSample/.idea/gradle.xml

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‎JniSample/.idea/misc.xml

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‎JniSample/.idea/runConfigurations.xml

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‎JniSample/README.md

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# Jni android sample
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JNI stands for Java Native Interface. This sample is showing how to call native c/c++ method to be used inside android.
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In order to run this sample, you need to install <b>NDK</b> in android SDK manager beforehand.
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If you looked through, the project contains c/c++ file which contains:
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#include <jni.h>
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#include "sample-jni.h"
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extern "C"
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JNIEXPORT jint JNICALL
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Java_com_pramonow_androidadvanced_JniActivity_getKey(JNIEnv* pEnv, jobject instance, jint key1) {
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return key1+200;
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}
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And the getKey function will be able to be called inside the activity:
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//Our Jni method
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external fun getKey(key:Int):Int
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companion object {
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init {
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System.loadLibrary("sample-jni")
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}
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}
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override fun onCreate(savedInstanceState: Bundle?) {
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super.onCreate(savedInstanceState)
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setContentView(R.layout.activity_jni)
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Toast.makeText(this,getKey(55).toString(),Toast.LENGTH_SHORT).show() // will show 255
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}

‎JniSample/app/.gitignore

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/build

‎JniSample/app/CMakeLists.txt

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# Sets the minimum version of CMake required to build your native library.
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# This ensures that a certain set of CMake features is available to
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# your build.
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cmake_minimum_required(VERSION 3.10.2)
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# Specifies a library name, specifies whether the library is STATIC or
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# SHARED, and provides relative paths to the source code. You can
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# define multiple libraries by adding multiple add_library() commands,
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# and CMake builds them for you. When you build your app, Gradle
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# automatically packages shared libraries with your APK.
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add_library( # Specifies the name of the library.
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sample-jni
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# Sets the library as a shared library.
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SHARED
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# Provides a relative path to your source file(s).
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src/main/cpp/sample-jni.cpp )
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# Searches for a specified prebuilt library and stores the path as a
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# variable. Because CMake includes system libraries in the search path by
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# default, you only need to specify the name of the public NDK library
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# you want to add. CMake verifies that the library exists before
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# completing its build.
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find_library( # Sets the name of the path variable.
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log-lib
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# Specifies the name of the NDK library that
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# you want CMake to locate.
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log )
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# Specifies libraries CMake should link to your target library. You
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# can link multiple libraries, such as libraries you define in this
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# build script, prebuilt third-party libraries, or system libraries.
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target_link_libraries( # Specifies the target library.
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sample-jni
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# Links the target library to the log library
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# included in the NDK.
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${log-lib} )

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