CMake build error: "More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'"
CMake build error: "More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'"
我正在尝试在 Android Studio (4.0.0) 项目上设置 OpenCv 3.4.14，该项目从一开始就支持 C++（本机项目）。我一遍又一遍地收到这个错误。我在网上搜索了一下，没有找到任何有用的解决方案，请帮忙。
我按照 this video 在 Android Studio 上设置 OpenCv。它在视频中效果很好，但由于某些原因它对我不起作用。
注：
我尝试在不包含 c++ 的项目上设置 OpenCv，并且它没有任何问题。是什么让我认为这里的问题出在 CMakeLists.txt 文件中。
所以我将在这里分享我所有的东西（在观看上面的视频之后）：
项目结构：
build.gradle (:app):
apply plugin: 'com.android.application'
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.artest"
minSdkVersion 16
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags ""
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
version "3.10.2"
}
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation project(path: ':openCVLibrary3414')
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
build.gradle (:openCVLibrary3414):
apply plugin: 'com.android.library'
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
minSdkVersion 16
targetSdkVersion 30
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
CMakeLists.txt:
set(pathToProject E:/ArTest)
set(pathToOpenCv C:/OpenCV-android-sdk)
# 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)
set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
include_directories(${pathToOpenCv}/sdk/native/jni/include)
# 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).
native-lib.cpp )
add_library( lib_opencv SHARED IMPORTED)
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${pathToProject}/app/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)
# 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( native-lib ${log-lib} lib_opencv)
HomeActivity.java:
package com.artest;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.opencv.android.OpenCVLoader;
public class MainActivity extends AppCompatActivity {
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
System.loadLibrary("opencv_java3");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Example of a call to a native method
TextView tv = findViewById(R.id.sample_text);
tv.setText(stringFromJNI());
if (!OpenCVLoader.initDebug()) {
tv.setText(tv.getText() + ", OpenCv is not working.");
}
else {
tv.setText(tv.getText() + "\n GREAT!!! OpenCv is working.");
tv.setText(tv.getText() + "\n" + validate(0L, 0L));
}
}
/**
* A native method that is implemented by the 'native-lib' native library,
* which is packaged with this application.
*/
public native String stringFromJNI();
public native String validate(long matAddrGr, long matAddrRgba);
}
原生-lib.cpp:
#include <jni.h>
#include <string>
#include <opencv2/core.hpp>
extern "C" JNIEXPORT jstring JNICALL
Java_com_artest_MainActivity_stringFromJNI(
JNIEnv* env,
jobject /* this */)
{
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
extern "C"
jstring Java_com_artest_MainActivity_validate(
JNIEnv* env,
jobject, jlong addrGray, jlong addrRgba)
{
cv::Rect();
cv::Mat();
std::string hello = "Hello from validate";
return env->NewStringUTF(hello.c_str());
}
错误：
More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'. If you are using jniLibs and CMake IMPORTED targets, see https://developer.android.com/studio/preview/features#automatic_packaging_of_prebuilt_dependencies_used_by_cmake
构建结果：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeDebugNativeLibs'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'. If you are using jniLibs and CMake IMPORTED targets, see https://developer.android.com/studio/preview/features#automatic_packaging_of_prebuilt_dependencies_used_by_cmake
对于在本机 c++ Android 项目中配置 OpenCV 的任何人来说，我发现这个 video 很有用，它是在 Android 上设置 OpenCV 的最佳指南。所有工作仅由 CMake 文件完成。它对我有用。
我正在尝试在 Android Studio (4.0.0) 项目上设置 OpenCv 3.4.14，该项目从一开始就支持 C++（本机项目）。我一遍又一遍地收到这个错误。我在网上搜索了一下，没有找到任何有用的解决方案，请帮忙。
我按照 this video 在 Android Studio 上设置 OpenCv。它在视频中效果很好，但由于某些原因它对我不起作用。
注：
我尝试在不包含 c++ 的项目上设置 OpenCv，并且它没有任何问题。是什么让我认为这里的问题出在 CMakeLists.txt 文件中。
所以我将在这里分享我所有的东西（在观看上面的视频之后）：
项目结构：
build.gradle (:app):
apply plugin: 'com.android.application'
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
applicationId "com.artest"
minSdkVersion 16
targetSdkVersion 30
versionCode 1
versionName "1.0"
testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
externalNativeBuild {
cmake {
cppFlags ""
}
}
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
}
}
externalNativeBuild {
cmake {
path "src/main/cpp/CMakeLists.txt"
version "3.10.2"
}
}
}
dependencies {
implementation fileTree(dir: "libs", include: ["*.jar"])
implementation 'androidx.appcompat:appcompat:1.2.0'
implementation 'androidx.constraintlayout:constraintlayout:2.0.4'
implementation project(path: ':openCVLibrary3414')
testImplementation 'junit:junit:4.12'
androidTestImplementation 'androidx.test.ext:junit:1.1.2'
androidTestImplementation 'androidx.test.espresso:espresso-core:3.3.0'
}
build.gradle (:openCVLibrary3414):
apply plugin: 'com.android.library'
android {
compileSdkVersion 30
buildToolsVersion "30.0.3"
defaultConfig {
minSdkVersion 16
targetSdkVersion 30
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.txt'
}
}
}
CMakeLists.txt:
set(pathToProject E:/ArTest)
set(pathToOpenCv C:/OpenCV-android-sdk)
# 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)
set(CMAKE_VERBOSE_MAKEFILE on)
set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=gnu++11")
include_directories(${pathToOpenCv}/sdk/native/jni/include)
# 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).
native-lib.cpp )
add_library( lib_opencv SHARED IMPORTED)
set_target_properties(lib_opencv PROPERTIES IMPORTED_LOCATION ${pathToProject}/app/src/main/jniLibs/${ANDROID_ABI}/libopencv_java3.so)
# 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( native-lib ${log-lib} lib_opencv)
HomeActivity.java:
package com.artest;
import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;
import org.opencv.android.OpenCVLoader;
public class MainActivity extends AppCompatActivity {
// Used to load the 'native-lib' library on application startup.
static {
System.loadLibrary("native-lib");
System.loadLibrary("opencv_java3");
}
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Example of a call to a native method
TextView tv = findViewById(R.id.sample_text);
tv.setText(stringFromJNI());
if (!OpenCVLoader.initDebug()) {
tv.setText(tv.getText() + ", OpenCv is not working.");
}
else {
tv.setText(tv.getText() + "\n GREAT!!! OpenCv is working.");
tv.setText(tv.getText() + "\n" + validate(0L, 0L));
}
}
/**
* A native method that is implemented by the 'native-lib' native library,
* which is packaged with this application.
*/
public native String stringFromJNI();
public native String validate(long matAddrGr, long matAddrRgba);
}
原生-lib.cpp:
#include <jni.h>
#include <string>
#include <opencv2/core.hpp>
extern "C" JNIEXPORT jstring JNICALL
Java_com_artest_MainActivity_stringFromJNI(
JNIEnv* env,
jobject /* this */)
{
std::string hello = "Hello from C++";
return env->NewStringUTF(hello.c_str());
}
extern "C"
jstring Java_com_artest_MainActivity_validate(
JNIEnv* env,
jobject, jlong addrGray, jlong addrRgba)
{
cv::Rect();
cv::Mat();
std::string hello = "Hello from validate";
return env->NewStringUTF(hello.c_str());
}
错误：
More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'. If you are using jniLibs and CMake IMPORTED targets, see https://developer.android.com/studio/preview/features#automatic_packaging_of_prebuilt_dependencies_used_by_cmake
构建结果：
FAILURE: Build failed with an exception.
* What went wrong:
Execution failed for task ':app:mergeDebugNativeLibs'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.Workers$ActionFacade
> More than one file was found with OS independent path 'lib/arm64-v8a/libopencv_java3.so'. If you are using jniLibs and CMake IMPORTED targets, see https://developer.android.com/studio/preview/features#automatic_packaging_of_prebuilt_dependencies_used_by_cmake
对于在本机 c++ Android 项目中配置 OpenCV 的任何人来说，我发现这个 video 很有用，它是在 Android 上设置 OpenCV 的最佳指南。所有工作仅由 CMake 文件完成。它对我有用。