欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

Android Studio 如何编译SO

程序员文章站 2024-03-25 08:43:34
...

1,编写native java文件

public class OpenCvRebuild {


    static {
        System.loadLibrary("openCvRebuild");
    }
    public static native void  testOpenCV(String name,int num);
    public static native String testReturnString(float num);
    public static native int testReturnInt(double num);
    public static native float testReturnFloat(String name,int num,float order,double age);
    public static native double testReturnDouble(String test);
}

2.生成对应的.h文件,使用最基础的方法

2.1首先将java文件编译成.class文件 ,使用命令javac OpenCvRebuild.java

打开Android Studio的Terminal工具,定位到OpenCvRebuild.java所在的目录(可以直接将OpenCvRebuild.java所在目录直接拖拽到Termianl中):


D:\demo\MyApplication\app\src\main\java\com\test\myapplication>javac OpenCvRebuild.java

D:\demo\MyApplication\app\src\main\java\com\test\myapplication>

刷新一下目录,就可以看到在myapplication目录下面多了一个.class文件:

Android Studio 如何编译SO

2.2 将.class文件生成.h文件

在Terminal工具中将文件路径定位到java

Android Studio 如何编译SO

输入指令:


D:\demo\MyApplication\app\src\main\java>javah com.test.myapplication.OpenCvRebuild

D:\demo\MyApplication\app\src\main\java>

之后刷新目录可以得到一个.h文件

Android Studio 如何编译SO

到此位置,.h文件就创建好了

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_test_myapplication_OpenCvRebuild */

#ifndef _Included_com_test_myapplication_OpenCvRebuild
#define _Included_com_test_myapplication_OpenCvRebuild
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testOpenCV
 * Signature: (Ljava/lang/String;I)V
 */
JNIEXPORT void JNICALL Java_com_test_myapplication_OpenCvRebuild_testOpenCV
  (JNIEnv *, jobject, jstring, jint);

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnString
 * Signature: (F)Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnString
  (JNIEnv *, jobject, jfloat);

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnInt
 * Signature: (D)I
 */
JNIEXPORT jint JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnInt
  (JNIEnv *, jobject, jdouble);

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnFloat
 * Signature: (Ljava/lang/String;IFD)F
 */
JNIEXPORT jfloat JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnFloat
  (JNIEnv *, jobject, jstring, jint, jfloat, jdouble);

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnDouble
 * Signature: (Ljava/lang/String;)D
 */
JNIEXPORT jdouble JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnDouble
  (JNIEnv *, jobject, jstring);

#ifdef __cplusplus
}
#endif
#endif

下面根据.h文件写.c或.cpp文件

3.在main目录下创建一个jni目录,将.h文件剪切到jni目录下面,并根据.h文件生成.c文件

 



/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
#include <com_test_myapplication_OpenCvRebuild.h>
/* Header for class com_test_myapplication_OpenCvRebuild */

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testOpenCV
 * Signature: (Ljava/lang/String;I)V
 */
JNIEXPORT void JNICALL Java_com_test_myapplication_OpenCvRebuild_testOpenCV
   (JNIEnv *env, jobject object, jstring name, jint num){


  }

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnString
 * Signature: (F)Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnString
  (JNIEnv *env, jobject obj, jfloat  num){

    return (*env)->NewStringUTF(env,"testReturnString");
  }

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnInt
 * Signature: (D)I
 */
JNIEXPORT jint JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnInt
  (JNIEnv *env, jobject obj, jdouble num){
 return 10;
  }

/*
 * Class:     com_test_myapplication_OpenCvRebuild
 * Method:    testReturnFloat
 * Signature: (Ljava/lang/String;IFD)F
 */
JNIEXPORT jfloat JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnFloat
  (JNIEnv *env, jobject obj, jstring name, jint intNum, jfloat floatNum, jdouble doubleNum){

return 1.10;
  }

JNIEXPORT jdouble JNICALL Java_com_test_myapplication_OpenCvRebuild_testReturnDouble
  (JNIEnv *env, jobject obj, jstring name){

return 2.0004;
  }

 

4.再在jni目录下面创建Android.mk和Application.mk

Android.mk   

LOCAL_MODULE标识生成的so库名称

LOCAL_SRC_FILES:jni目录下的.c文件,如果是多个.c文件可以用"\"分开

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)


LOCAL_MODULE    := openCvRebuild   

LOCAL_SRC_FILES :=\
testC.c

include $(BUILD_SHARED_LIBRARY)

 

Application.mk

APP_ABI := armeabi-v7a  arm64-v8a  x86  x86_64
APP_MODULES := openCvRebuild
APP_CFLAGS += -DSTDC_HEADERS
APP_PLATFORM := android-21

5.现在所有的准备文件都已经做好,可以直接打包.so

在Terminal工具中定位到jni目录,输入指令ndk-build

Android Studio 如何编译SO

刷新目录,得到一个libs包,将这个包中的内容粘贴到jniLibs中,就可以调用了

Android Studio 如何编译SO

 

 

 

 

 

 

 

 

 

相关标签: so