AS导入ffmpeg

1、Android Studio 新建c++工程

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2、为了方便编写CMakeLists.txt脚本的文件路径，把CMakeLists.txt从cpp目录下移动到app目录下，同时修改build.gradle(:app)中cmake 路径为：

 externalNativeBuild {
        cmake {
            path file('src/main/cpp/CMakeLists.txt')
            version '3.10.2'
        }
    }

改为

 externalNativeBuild {
        cmake {
            path file('CMakeLists.txt')
            version '3.10.2'
        }
    }

3、在app/src/main下心建文件目录jniLibs/armeabi-v7a，abi目录根据你编译的so而定。我编译的是armeabi-v7a。编译ffmpeg 复制编译好的so到此目录下：

x
4、复制头文件到cpp目录下：
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5、编译...
报如下错误

Execution failed for task ':app:buildCMakeDebug'.
> Build command failed.
  Error while executing process /Users/springtom/Library/Android/sdk/cmake/3.10.2.4988404/bin/ninja with arguments {-C /Users/springtom/Documents/source/MeiKTVPlayer/app/.cxx/Debug/21a2r4x6/arm64-v8a meiplayer}
  ninja: Entering directory `/Users/springtom/Documents/source/MeiKTVPlayer/app/.cxx/Debug/21a2r4x6/arm64-v8a'

解决：
在app build的android下添加

ndk{
           abiFilters "armeabi-v7a"
       }

6、再编译...
报如下错误

2 files found with path 'lib/armeabi-v7a/libavcodec.so' from inputs:
 - /Users/springtom/Documents/source/MeiPlayer/app/build/intermediates/merged_jni_libs/debug/out/armeabi-v7a/libavcodec.so
 - /Users/springtom/Documents/source/MeiPlayer/app/build/intermediates/cxx/Debug/2r1c3m1y/obj/armeabi-v7a/libavcodec.so
If you are using jniLibs and CMake IMPORTED targets, see
https://developer.android.com/r/tools/jniLibs-vs-imported-targets

解决：这个原因是由于gralde版本问题导致的，这个问题困扰我不少时间，最开始以为是编译的so有问题，走了弯路。
我的gradle版本：
build.gradle(MeiKTVPlayer)

 dependencies {
        classpath "com.android.tools.build:gradle:7.0.3"

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }

gradle-wapper.properties

distributionUrl=https\://services.gradle.org/distributions/gradle-7.0.2-bin.zip

改为：

   dependencies {
        classpath 'com.android.tools.build:gradle:3.6.2'

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }

distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip

7、再编译...
报错

Settings file '/Users/springtom/Documents/source/MeiKTVPlayer/settings.gradle' line: 1

A problem occurred evaluating settings 'MeiKTVPlayer'.
> Could not find method dependencyResolutionManagement() for arguments [settings_8ngoy7e4c0dkpao131h5v8fyd$_run_closure1@7db6a8d2] on settings 'MeiKTVPlayer' of type org.gradle.initialization.DefaultSettings.

原因 由于高版本的gradle 依赖管理放到了setttings.gradle，版本已经改低，依赖管理也应该改回到原来的build.gradle中。
去掉settings.gradle中的依赖管理

dependencyResolutionManagement {
    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
    repositories {
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
    }
}

在build.gradle(MeiKTVPlayer)中添加

allprojects {
    repositories {
        google()
        mavenCentral()
        jcenter() // Warning: this repository is going to shut down soon
    }
}

8、再编译...
报错：

Build file '/Users/springtom/Documents/source/MeiKTVPlayer/app/build.gradle' line: 6

A problem occurred evaluating project ':app'.
> Could not find method compileSdk() for arguments [32] on object of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension.

原因：还是降低gradle版本所致
解决：
build.gralde(:app)下

android {
    compileSdk 32

    defaultConfig {
        applicationId "com.aimei.meiktvplayer"
        minSdk 21
        targetSdk 32

改为：

android {
    compileSdkVersion 32

    defaultConfig {
        applicationId "com.aimei.meiktvplayer"
        minSdkVersion 21
        targetSdkVersion 32

9、再编译...
报错：

Build file '/Users/springtom/Documents/source/MeiKTVPlayer/app/build.gradle' line: 42

A problem occurred evaluating project ':app'.
> Could not find method buildFeatures() for arguments [build_53peu55ukn4y7po6cm8ujhgkj$_run_closure1$_closure7@182b0cc] on object of type com.android.build.gradle.internal.dsl.BaseAppModuleExtension.

原因 viewbing也需要改成老版本

  buildFeatures {
        viewBinding true
    }

改为：

 viewBinding {
        enabled = true
    }

到此就能编译成功

10、把播放器迁移到（略）