React Native with JNI & C文章阅读笔记

链接: https://thebhwgroup.com/blog/react-native-jni
对应的演示代码: https://github.com/rdixonbhw/ReactNative-JNI-Blog

我按照这个react jni入门教程做相关操作,由于版本升级,需要做一些修改,下面就是一些记录;

• 可以通过在local.properties中添加来指定使用的cmake ，形如
  cmake.dir=C:/android-sdk_r24.4.1-windows/cmake/3.10.2.4988404 
• cmake的配置参考
  https://developer.android.com/studio/projects/configure-cmake
  具体到上面这个文章中的例子则修改
  android/app/src/mian/CMakeLists.txt为：

cmake_minimum_required(VERSION 3.10.2)

# Set compiler flags
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -frtti -fexceptions -std=c++14 -Wno-deprecated-declarations -Wno-reorder -Wno-invalid-offsetof -fPIC")

# Add source files to be compliled here
# Path is relative to this CMakeLists.txt file
set(SOURCE_FILES
        ./jni/hello_world.c
        )

add_library( # Specifies the name of the library.
             hello_world_jni

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             ${SOURCE_FILES} )

• Gradle的配置参考   

https://developer.android.com/studio/projects/gradle-external-native-builds
具体到上面这个文章中的例子则修改
android/app/build.gradle

在defaultConfig 节点之中添加
ndk {
            abiFilters "armeabi-v7a", "x86"
            moduleName "hello_world_jni"
            ldLibs "log"
            cFlags "-std=c99"
        }
buildTypes节点的同级之下添加
sourceSets { main { jni.srcDirs = ['src/main/jni/'] } }
externalNativeBuild {
    cmake {
        path "src/main/CMakeLists.txt"
    }
}

• gradle.properties最后的android.useDeprecatedNdk=true去掉  
• 还需要注意的是hello_world.c中的函数名中的包名部分要和你自己例子工程中HelloWorlModule.java的包名对应上;  
• 另外一个修改MyReactPackage的createJSModules之上的@Override在新版本里不再需要；  
• 在MainApplication的getPackages()函数中添加packages.add(new MyReactPackage());  

参考：
[APP闪退分析及Crash日志获取（PC端Log打印）](https://blog.csdn.net/u013110200/article/details/92767776)
[Android 发出警告 android.useDeprecatedNdk 不在被支持](https://www.jianshu.com/p/34b5702d3927)
[Just remove the @Override Annotation of createJSModules() and it will work for both!](https://stackoverflow.com/questions/45584887/react-native-0-47-removed-createjsmodules-method-retrocompatibility)