可以创建一个默认的C++的Native工程
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引入依赖 编译好的FFmpeg的so文件
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同时引入编译好后生成的include源码文件
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开始配置CMakeList.txt
- 其实配置很简单：
1.include_directories(include) 这是引入头文件
- include_directories 和 set_target_properties 是引入对应的so文件，如果编译成一个so文件的话 就不用这么麻烦，一个就搞定（但是在最新版本的NDK 21和FFMpeg4.3.1 下 我不知道如何编译成一个so文件,如果会的可以私信告诉我下）
3.find_library 就是对应上面的配置文件 注意的是：native-lib 要放在最前面
# 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 3.10.2)
# Declares and names the project.
project("test341")
include_directories(include)
add_library(avcodec
SHARED
IMPORTED)
set_target_properties(avcodec
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libavcodec.so)
add_library(avdevice
SHARED
IMPORTED)
set_target_properties(avdevice
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libavdevice.so)
add_library(avfilter
SHARED
IMPORTED)
set_target_properties(avfilter
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libavfilter.so)
add_library(avformat
SHARED
IMPORTED)
set_target_properties(avformat
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libavformat.so)
add_library(avutil
SHARED
IMPORTED)
set_target_properties(avutil
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libavutil.so)
add_library(postproc
SHARED
IMPORTED)
set_target_properties(postproc
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libpostproc.so)
add_library(swresample
SHARED
IMPORTED)
set_target_properties(swresample
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libswresample.so)
add_library(swscale
SHARED
IMPORTED)
set_target_properties(swscale
PROPERTIES IMPORTED_LOCATION
../../../../libs/armeabi-v7a/libswscale.so)
# 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( # 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
avcodec
avdevice
avfilter
avformat
avutil
postproc
swresample
swscale
# Links the target library to the log library
# included in the NDK.
-landroid
${log-lib})
上面的配置是完全ok的，值得注意的是，如果你的CMakeList文件在app目录下 就配置对应的路径就行！
gradle.build配置
plugins {
id 'com.android.application'
id 'kotlin-android'
}
android {
compileSdkVersion 30
buildToolsVersion "30.0.2"
defaultConfig {
applicationId "com.marvel.test341"
minSdkVersion 23
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags ""
}
ndk {
//选择要添加的对应cpu类型的.so库。
abiFilters "armeabi-v7a"
// 还可以添加 'x86', 'x86_64', 'mips', 'mips64'
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
version "3.10.2"
}
}
compileOptions {
sourceCompatibility JavaVersion.VERSION_1_8
targetCompatibility JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = '1.8'
}
}
dependencies {
implementation "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
implementation 'androidx.core:core-ktx:1.3.2'
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'com.google.android.material:material:1.2.1'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
testImplementation 'junit:junit:4.+'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
最后是在项目中使用
companion object {
// Used to load the 'native-lib' library on application startup.
init {
System.loadLibrary("native-lib")
}
}
可以看到 这里只是加载native-lib 就行，不像之前需要一一引入例如：avcodec 这类的so文件 其实这些文件 已经在CMakeList已经帮忙引入了，这样一来简化了很多步骤了！
源码：一个so库As中配置使用
源码：多个so库As中配置使用
