Android(安卓)Studio JNI开发-CMake方式
16lz
2021-01-26
Android Studio 开发jni所需插件:
如下图所示:
安装上图中红框标注的插件,可以很友好的进行c/c++代码编写
注:Android Studio的版本2.2及以上版本
开发过程
1、创建项目需要注意
注:include C++ support 打勾选择
C++支持选择.png
项目创建完成。
2、查看项目结构
c3.png
CMakeLists.txt:替代了之前的Android.mk和Application.mk
# 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. #(1) 自定义so文件名称,可以自定义修改 fm # Sets the library as a shared library. SHARED # Provides a relative path to your source file(s). #(3)如果新增.cpp/.c文件时,需要手动在下面添加对应的文件全路径 src/main/cpp/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. # (2)自定义so文件名称,可以自定义修改 fm # Links the target library to the log library # included in the NDK. ${log-lib} )
如上面的文本所示:
(1)和(2)位置,如果需要自定义名称时,需要都修改;
(3)位置,如果新增.cpp/.c文件需要手动注册;
3、编译查看生成的.so文件
如下图所示:
根据上图我们可以看出生成的.so文件的位置和 Android Studio JNI开发-1中生成的位置路径不一致。
4、操作过程
创建java 的native方法
package fmblzf.cmakejni.ndk;/** * Created by Administrator on 2017/5/25. */public class CMakeNative { /** * 静态加载.so文件 * 注意加载的so文件名称和build.gradle中的moduleName保持一致 * 即没有lib前缀的文件名 */ static { System.loadLibrary("fm"); } /** * 测试.so文件链接成功 * @param str * @return */ public static native String test(String str);}
然后根据创建的类和方法去编写对应的jni代码,和Android Studio JNI开发-1中的操作完全一致,但是不同的是,在编写jni代码的时候友好的代码提示功能是非常有用和方便的。
而且代码检查过程也忽略了爆红的情况( Android Studio JNI开发-1存在爆红,但是运行没有问题)。
5、运行
运行通过!!
源码下载
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