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ndk's Introduction

NDK

一、JNI开发基础知识

1.JNI基础知识

2.注意事项

  2.1.DelLocalRef/DelGloalRef
  2.2.GetxxxElements/ReleasexxxElements
  2.3.类型
  2.4.JNI_Onload与注册本地函数

3.类型转换

4.JNI_Onload与注册本地函数

5.阅读官方demo（HelloJNI，HelloJNICallack，Hello-libs）

6.遇到崩溃时定位代码行方法

https://docs.oracle.com/javase/7/docs/technotes/guides/jni/spec/jniTOC.html

https://developer.android.com/training/articles/perf-jni

二、C/C++基础知识

std c++ 98 / std c++ 11 /std c++ 14 三者区别

线程知识PThread

cmake知识

三、实战

项目一：使用Native获取签名并且验证(libsignature.so)。

项目二：使用Native编写Socket长连接，需要熟悉Select，Poll，EPoll区别(libsocket.so)。

项目三：使用Native编写ffmpeg功能(libFFmpegCmd.so，libFFmpegMain.so)。

    a.编译ffmpeg源码，生成so库文件，再自己编写FFmpegCmd.so实现通过命令行实现ffmpeg功能。
    
    b.编译ffmpeg源码，生成so库文件，再自己编写FFmpegMain.so通过ffmpeg的api实现给视频文件添加水印功能/视频裁剪功能。

https://github.com/wxmylife/JNI_RSA_Sign

https://www.jianshu.com/p/3d5be02616f4

https://cmake.org/cmake/help/latest/command/add_library.html

https://google.github.io/android-gradle-dsl/current/com.android.build.gradle.internal.dsl.ExternalNativeCmakeOptions.html

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