在自己的AndroidStudio项目中引入Google开源的串口通信方案

本文主要介绍，如何在自己的AndroidStudio项目中引入Google开源的串口通信方案（android-serialport-api）
完整项目地址 https://github.com/Micheal-Yan/ImportDemo
Google开源的方案项目地址 https://github.com/cepr/android-serialport-api
演示如何与自动售货机建立串口通信，从而达到控制自动售货机的目的 https://github.com/Micheal-Yan/FuJiTestDemo

1，在使用AndroidStudio创建新项目时，勾选Include C++ support

2，将Google官方Demo代码中SerialPort.java和SerialPortFinder.java这两个Java文件，直接拷贝到我们的项目中来

3，打开SerialPort.java文件，将光标分别移至open和close方法上，然后按住Alt+Enter快捷键，选择"Create function xxx"快捷方式，将会自动为我们在native-lib.cpp文件中，为我们创建对应的jni方法

4，将Google官方Demo代码中serial_port.h和serial_port.c这两个C源文件，分别拷贝的项目的cpp/include和cpp目录下，并修改jni方法签名为上一步编译器自动生成签名

5，修改CMakeLists.txt内容如下

# 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( # Sets the name of the library.
             serial_port

             # Sets the library as a shared library.
             SHARED

             # Provides a relative path to your source file(s).
             src/main/cpp/serial_port.c )

# Specifies a path to native header files.
include_directories(src/main/cpp/include/)

# 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.
                       serial_port

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

6，删除创建项目时，在MainActivity.java文件中为我们自动生成的JNI使用演示代码片段和native-lib.cpp文件（下图框选的部分都要删除）

7，在工具栏选择Build-Refresh Linked C++ Projects，刷新一下项目，至此导入完毕