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阿里云网站建设方案书怎么写,南京电器网站建设,wordpress注册邮箱空白,新冠为什么莫名消失了文件结构#xff08;选中的为生成的#xff09; CMake构建不需要执行命令#xff0c;会自动生成so文件打包进apk Android mk构建需要执行命令生成so文件#xff0c;再打包进apk。命令如下。 # 在jni目录下执行

生成com_demo_cppproject_OtherNdkTest.h头文件

javac -h .…文件结构选中的为生成的 CMake构建不需要执行命令会自动生成so文件打包进apk Android mk构建需要执行命令生成so文件再打包进apk。命令如下。 # 在jni目录下执行

生成com_demo_cppproject_OtherNdkTest.h头文件

javac -h ./ ../java/com/demo/cppproject/OtherNdkTest.java

构建出so文件

ndk-build NDK_PROJECTPATH. NDK_APPLICATION_MKApplication.mk NDK_BUILD_SCRIPTAndroid.mk NDK_LIBS_OUT..\jniLibs\ MainActivity.java package com.demo.cppproject; public class MainActivity extends AppCompatActivity {// Used to load the cppproject library on application startup.static {System.loadLibrary(cppproject);System.loadLibrary(DEMO);}private ActivityMainBinding binding;Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);binding ActivityMainBinding.inflate(getLayoutInflater());setContentView(binding.getRoot());TextView tv binding.sampleText;String temp stringFromJNI() \n new MyNdkTest().getData() \n new OtherNdkTest().getName() new OtherNdkTest().count();tv.setText(temp);}public native String stringFromJNI(); }MyNdkTest.java package com.demo.cppproject;public class MyNdkTest {public native String getData(); }OtherNdkTest.java package com.demo.cppproject;public class OtherNdkTest {public native String getName();public native int count(); }CMakeLists.txt

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 3.22.1)# Declares and names the project.project(cppproject)# 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.cppproject# Sets the library as a shared library.SHARED# Provides a relative path to your source file(s).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.cppproject# Links the target library to the log library# included in the NDK.${log-lib})native-lib.cpp

#include assert.h #include jni.h #include string#ifndef _Included_com_demo_cppproject_MyNdkTest #define _Included_com_demo_cppproject_MyNdkTest #ifdef __cplusplus extern C { #endifJNIEXPORT jstring JNICALL Java_com_demo_cppproject_MainActivity_stringFromJNI(JNIEnv env,jobject / this */) {std::string hello 静态注册cmake构建Hello from C;return env-NewStringUTF(hello.c_str()); }// 定义的对应java中的定义native方法 采用动态注册 //extern C JNIEXPORT jstring JNICALL Java_com_demo_cppproject_MyNdkTest_getData( JNIEXPORT jstring JNICALL getData(JNIEnv env,jobject / this /) {std::string hello 动态注册!cmake构建get data;return env-NewStringUTF(hello.c_str()); }//需要动态注册的native方法所在的类 #define JNIREG_CLAS_MAIN com/demo/cppproject/MyNdkTest//创建JNINativeMethod的数组用来存放JNINativeMethod结构变量 // JNINativeMethod结构存放注册的native方法对应的签名C/C的对应的JNI方法 static JNINativeMethod gMethods[] {{getData, ()Ljava/lang/String;, (void)getData} };static int registerNativeMethods(JNIEnv *env, const char *className,JNINativeMethod gMethods, int numMethods) {jclass clazz;clazz env-FindClass(className);if (clazz NULL) {return JNI_FALSE;}if (env-RegisterNatives(clazz, gMethods, numMethods) 0) {return JNI_FALSE;}return JNI_TRUE; }/**

• 注册native方法 */ static int registerNatives(JNIEnv *env) {if (!registerNativeMethods(env, JNIREG_CLAS_MAIN, gMethods,sizeof(gMethods) / sizeof(gMethods[0]))) {return JNI_FALSE;}return JNI_TRUE; }/**

• 如果要实现动态注册这个方法一定要实现

• 动态注册工作在这里进行 */ JNIEXPORT jintJNICALL JNI_OnLoad(JavaVM *vm, void *reserved) {JNIEnv env NULL;jint result -1;if (vm-GetEnv((void **) env, JNI_VERSION_1_4) ! JNI_OK) {return -1;}assert(env ! NULL);if (!registerNatives(env)) { //注册return -1;}result JNI_VERSION_1_4;return result; }#ifdef __cplusplus } #endif #endifdemo.cpp // // Created by Admins on 2023/5/6. // / DO NOT EDIT THIS FILE - it is machine generated / #include jni.h #include string / Header for class com_demo_cppproject_MyNdkTest /#ifndef _Included_com_demo_cppproject_OtherNdkTest #define _Included_com_demo_cppproject_OtherNdkTest #ifdef __cplusplus extern C { #endif /** Class: com_demo_cppproject_MyNdkTest Method: getData* Signature: ()Ljava/lang/String;*/ JNIEXPORT jstring JNICALL Java_com_demo_cppproject_OtherNdkTest_getName(JNIEnv env, jobject){std::string hello 静态注册Android mk构建Hi from C;return env-NewStringUTF(hello.c_str()); }/** Class: com_demo_cppproject_MyNdkTest Method: count* Signature: ()I*/ JNIEXPORT jint JNICALL Java_com_demo_cppproject_OtherNdkTest_count(JNIEnv *env, jobject){return 11; }#ifdef __cplusplus } #endif #endif Android.mk

  Android.mk 参数# 设置工作目录它用于在开发tree中查找源文件。宏my-dir由Build System提供,会返回Android.mk文件所在的目录

  LOCAL_PATH : $(call my-dir)# CLEAR_VARS变量由Build System提供。指向一个指定的GNU Makefile由它负责清理LOCAL_xxx类型文件

  但不是清理LOCAL_PATH

  所有的编译控制文件由同一个GNU Make解析和执行其变量是全局的。所以清理后才能便面相互影响,这一操作必须有

  include $(CLEAR_VARS)# LOCAL_MODULE模块必须定义以表示Android.mk中的每一个模块名字必须唯一且不包含空格

  Build System 会自动添加适当的前缀和后缀。例如demo要生成动态库则生成libdemo.so。

  但请注意如果模块名字被定义为libabd则生成libabc.so。不再添加前缀。

  LOCAL_MODULE : DEMO# 指定参与模块编译的C/C源文件名。不必列出头文件build System 会自动帮我们找出依赖文件。

  缺省的C 源码的扩展名为.cpp。

  LOCAL_SRC_FILES : demo.cpp# BUILD_SHARED_LIBRARY是Build System提供的一个变量指向一个GUN Makefile Script。它负责收集自从上次调用include $(CLEAR_VARS)后的所有LOCAL_xxxxinx。并决定编译什么类型

  1. BUILD_STATIC_LIBRARY编译为静态库

  2. BUILD_SHARED_LIBRARY编译为动态库

  3. BUILD_EXECUTABLE编译为Native C 可执行程序

  4. BUILD_PREBUILT该模块已经预先编译

  include $(BUILD_SHARED_LIBRARY)# 命令

  ndk-build NDK_PROJECTPATH. NDK_APPLICATION_MKApplication.mk NDK_BUILD_SCRIPTAndroid.mk NDK_LIBS_OUT..\jniLibs\Application.mk

  #Application.mk 参数 APP_MODULES : DEMO

  默认生成支持的多种类型.so

  APP_ABI : allAPP_STL : c_shared #APP_PLATFORM : android-16不配置,打包.so会出错 APP_PLATFORM : android-19参考 JNI中native方法的几种注册方式 [NDK]-搭建ndk-build环境 Android Studio 4.0.NDK .so库生成打包