第一步:編寫kt代碼
class NativeLib {
/**
* A native method that is implemented by the 'netconfig' native library,
* which is packaged with this application.
*/
external fun stringFromJNI(): String
companion object {
// Used to load the 'netconfig' library on application startup.
init {
System.loadLibrary("netconfig")
}
}
}
第二步:編寫C代碼
#include <jni.h>
#include <string>
extern "C" JNIEXPORT jstring JNICALL
Java_com_larack_netconfig_NativeLib_stringFromJNI(
JNIEnv *env,
jobject /* this */) {
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
第三步:編寫CMakeLists.txt
cmake_minimum_required(VERSION 3.18.1)
project("netconfig")
add_library( # Sets the name of the library.
netconfig
# Sets the library as a shared library.
SHARED
# Provides a relative path to your source file(s).
netconfig.cpp )
find_library( # Sets the name of the path variable.
log-lib
# Specifies the name of the NDK library that
# you want CMake to locate.
log )
target_link_libraries( # Specifies the target library.
netconfig
# Links the target library to the log library
# included in the NDK.
${log-lib} )
第四步:編寫build.gralde配置
plugins {
id 'com.android.library'
id 'org.jetbrains.kotlin.android'
}
android {
compileSdk 32
defaultConfig {
minSdk 29
targetSdk 32
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
consumerProguardFiles "consumer-rules.pro"
externalNativeBuild {
cmake {
cppFlags ""
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
version "3.18.1"
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation 'androidx.core:core-ktx:1.7.0'
implementation 'androidx.appcompat:appcompat:1.3.0'
implementation 'com.google.android.material:material:1.4.0'
testImplementation 'junit:junit:4.13.2'
androidTestImplementation 'androidx.test.ext:junit:1.1.3'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.4.0'
}
第五步:調(diào)用jni并運(yùn)行android程序
value = NativeLib().stringFromJNI()
Hello from C++"
https://gitee.com/Larack/my-config