# 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 3.10.2)
# Declares and names the project.
project("ndk")
# 包含所有CPP文件 file(GLOB allCPP *.cpp)
# 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. native-lib
# Sets the library as a shared library. SHARED
# Provides a relative path to your source file(s). ${allCPP})
# 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. native-lib
# Links the target library to the log library # included in the NDK. ${log-lib} # 链接libndk-mac ndk-mac # 链接libndk-linux ndk-linux )
extern"C"JNIEXPORT jstring JNICALL Java_com_wangyz_ndk_MainActivity_stringFromJNI( JNIEnv *env,jobject /* this */){ int a = get(); LOG_I("hello:%d", a);
// Used to load the 'native-lib' library on application startup. static { System.loadLibrary("ndk-mac"); System.loadLibrary("ndk-linux"); System.loadLibrary("native-lib"); }
// Example of a call to a native method TextViewtv= findViewById(R.id.sample_text); tv.setText(stringFromJNI()); }
/** * A native method that is implemented by the 'native-lib' native library, * which is packaged with this application. */ publicnative String stringFromJNI(); }