Android中的JNI开发，你了解多少?

android {
    compileSdkVersion 29
    defaultConfig {
        minSdkVersion 22
        targetSdkVersion 29
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.test.runner.AndroidJUnitRunner"
        consumerProguardFiles 'consumer-rules.pro'
        externalNativeBuild {
            cmake {
                cppFlags "-fexceptions"
                abiFilters "armeabi-v7a"
            }
        }
        ndk{
            abiFilters"armeabi-v7a"
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
            version "3.10.2"
        }
    }
    compileOptions {
        sourceCompatibility = 1.8
        targetCompatibility = 1.8
    }
    sourceSets{
        main{
            jniLibs.srcDirs'libs'
        }
    }
    repositories {
        flatDir {
            dirs 'libs'
        }
    }
}

# For more information about using CMake with Android Studio, read the
# documentation: https://d.android.com/studio/projects/add-native-code.html
# Sets the minimum version of CMake required to build the native library.
cmake_minimum_required(VERSION 3.4.1)
# Creates and names a library, sets it as either STATIC
# or SHARED, and provides the relative paths to its source code.
# You can define multiple libraries, and CMake builds them for you.
# Gradle automatically packages shared libraries with your APK.
add_library(comm_lib SHARED IMPORTED)
set_target_properties(comm_lib
        PROPERTIES
        IMPORTED_LOCATION
        ../../../../libs/${ANDROID_ABI}/libcomm_lib.so)
add_library( # Sets the name of the library.
             native-lib
             # Sets the library as a shared library.
             SHARED
             # Provides a relative path to your source file(s).
             native-lib.cpp )
# Searches for a specified prebuilt library and stores the path as a
# variable. Because CMake includes system libraries in the search path by
# default, you only need to specify the name of the public NDK library
# you want to add. CMake verifies that the library exists before
# completing its build.
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 )
# Specifies libraries CMake should link to your target library. You
# can link multiple libraries, such as libraries you define in this
# build script, prebuilt third-party libraries, or system libraries.
target_link_libraries( # Specifies the target library.
       native-lib
        comm_lib
       # Links the target library to the log library
       # included in the NDK.
       ${log-lib} )