android jni配置

首先需要必要的配置

1、配置gradle

在build.gradle添加如下加粗代码

apply plugin: 'com.android.application'

android {
    compileSdkVersion 23
    buildToolsVersion "26.0.1"
    defaultConfig {
        applicationId "??????????????"
        minSdkVersion 15
        targetSdkVersion 23
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
    }

    

    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
//            ndk {
//                abiFilters "armeabi-v7a", "armeabi"
//            }
        }

        debug {
//            ndk {
//                abiFilters "armeabi-v7a", "armeabi"
//            }
        }
    }

    // Encapsulates your external native build configurations.
    externalNativeBuild {

        // Encapsulates your CMake build configurations.
        cmake {

            // Provides a relative path to your CMake build script.
            path "jni/CMakeLists.txt"
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:23.4.0'
    testCompile 'junit:junit:4.12'
}

2、添加jni目录

3、添加CMakeLists.txt文件，demo如下

# Sets the minimum version of CMake required to build the native
# library. You should either keep the default value or only pass a
# value of 3.4.0 or lower.

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 it for you.
# Gradle automatically packages shared libraries with your APK.

add_library( # Sets the name of the library.
             pwd

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             # Associated headers in the same location as their source
             # file are automatically included.
             Password.h;Password.cpp;)

# Searches for a specified prebuilt library and stores the path as a
# variable. Because system libraries are included 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 the
# build script, prebuilt third-party libraries, or system libraries.

target_link_libraries( # Specifies the target library.
                       pwd

                       # Links the target library to the log library
                       # included in the NDK.
                       ${log-lib} )