使用AndroidStudio編譯armeabi-v7a,arm64-v8a庫檔案步驟：

1.新建專案

2.修改CMakeLists.txt檔案

# 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.
#指定cmake的最小版本號
cmake_minimum_required(VERSION 3.4.1)
#定義專案名稱,可以不定義
#project(demo)
# 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.

#設定so庫的輸出路徑
set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${PROJECT_SOURCE_DIR}/libs/${ANDROID_ABI})




#設定編譯型別
#add_executable(demo demo.cpp) # 生成可執行檔案
#生成動態共享庫
add_library( # 設定編譯成so庫的名稱
             native-lib

             # 生成動態庫或共享庫，此處如果SHARED改為STATIC，其含義是生成靜態庫
             SHARED

             # 提供一個需要編譯的原始檔的相對路徑，native-lib.cpp就是需要編譯的原始檔
             native-lib.cpp )

#明確指定編譯時需要編譯哪些原始檔
#add_library(demo demo.cpp test.cpp util.cpp)

#aux_source_directory(dir VAR) 發現一個目錄下所有的原始碼檔案並將列表儲存在一個變數中。
#例如：aux_source_directory(. SRC_LIST) # 搜尋當前目錄下的所有.cpp檔案
#add_library(demo ${SRC_LIST})



# 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.
#查詢到指定的預編譯庫，並將它的路徑儲存在變數中
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.

#設定target需要連結的庫
target_link_libraries( # Specifies the target library.目標庫
                       native-lib

                       # Links the target library to the log library 目標庫需要連結的庫，log-lib是上面find_library指定的變數名
                       # included in the NDK.
                       ${log-lib} )

3.修改app的build.gradle檔案

 //ndk必須定義在defaultConfig目錄下,設定需要生成的cpu平臺,以下這兩個就能夠相容絕大多數的Android平臺
        ndk{
            abiFilters 'armeabi-v7a','arm64-v8a'
        }

4.執行編譯

編譯後會在cpp資料夾下自動新建一個libs檔案裡面就會存放各個平臺對應的動態共享so庫