Android Studio opencv C++ 在运行时编译链接库错误

Question

我正在使用带有 NDK 的 Gradle 2.6 的 Android Studio 1.3.2。

这是我的错误：

dlopen("/data/app/face.rt.jeanc.facert-2/lib/arm/libFace.so", RTLD_LAZY) failed: dlopen failed: "/data/app/face.rt.jeanc.facert-2/lib/arm/libFace.so" has unexpected e_machine: 40

另外，我的 lib Face 应该在我的文件夹（armabi、armabi-v7 等）中显示为 libFace.so，但不会出现（编译？）

这是我的 build.gradle：

apply plugin: 'com.android.model.application'

model {
    android {
        compileSdkVersion = 23
        buildToolsVersion = "23.0.1"

        defaultConfig.with {
            applicationId = "face.rt.jeanc.facert"
            minSdkVersion.apiLevel = 19
            targetSdkVersion.apiLevel = 19
            versionCode = 1
            versionName = "1.0.1"
        }

    }

    android.buildTypes {
        release {
            minifyEnabled = false
            proguardFiles += file('proguard-rules.txt')
        }
    }

    android.ndk { // keeping it to make AS correctly support C++ code editing and debugging
        moduleName = "Face"
        ldLibs += ['log']
        cppFlags += "-std=c++11"
        cppFlags += "-fexceptions"
        cppFlags += "-I${file("src/main/jni/prebuilts/include")}".toString()
        cppFlags  += "-I${file("C:/Android-dev/SDKs/OpenCV-android-sdk/sdk/native/jni/include")}".toString()
        cppFlags  += "-I${file("C:/Android-dev/SDKs/OpenCV-android-sdk/sdk/native/jni/include/opencv")}".toString()
        cppFlags  += "-I${file("C:/Android-dev/SDKs/OpenCV-android-sdk/sdk/native/jni/include/opencv2")}".toString()
        ldLibs += ["android", "EGL", "GLESv2", "dl", "log", "z"]// , "ibopencv_core"

        stl = "gnustl_shared" //"stlport_static"
    }


    android.productFlavors {
    // for detailed abiFilter descriptions, refer to "Supported ABIs" @
    // https://developer.android.com/ndk/guides/abis.html#sa
    create("arm") {
            ndk.with {
                abiFilters += "armeabi"

                File curDir = file('./')
                curDir = file(curDir.absolutePath)
                String libsDir = curDir.absolutePath+"\\src\\main\\jniLibs\\armeabi\\" //"-L" +

                ldLibs += libsDir + "libnative_camera_r4.3.0.so"
                ldLibs += libsDir + "libopencv_contrib.a"
                ldLibs += libsDir + "libopencv_core.a"
                ldLibs += libsDir + "libopencv_highgui.a"
                ldLibs += libsDir + "libopencv_imgproc.a"
                ldLibs += libsDir + "libopencv_info.so"
                ldLibs += libsDir + "libopencv_java.so"
                ldLibs += libsDir + "libopencv_legacy.a"
                ldLibs += libsDir + "libopencv_ml.a"
                ldLibs += libsDir + "libopencv_ts.a"

            }
        }
        create("armv7") {
            ndk.with {
                abiFilters += "armeabi-v7a"

                File curDir = file('./')
                curDir = file(curDir.absolutePath)
                String libsDir = curDir.absolutePath+"\\src\\main\\jniLibs\\armeabi-v7a\\" //"-L" +

                ldLibs += libsDir + "libnative_camera_r4.3.0.so"
                ldLibs += libsDir + "libopencv_contrib.a"
                ldLibs += libsDir + "libopencv_core.a"
                ldLibs += libsDir + "libopencv_highgui.a"
                ldLibs += libsDir + "libopencv_imgproc.a"
                ldLibs += libsDir + "libopencv_info.so"
                ldLibs += libsDir + "libopencv_java.so"
                ldLibs += libsDir + "libopencv_legacy.a"
                ldLibs += libsDir + "libopencv_ml.a"
                ldLibs += libsDir + "libopencv_ts.a"

            }
        }

        create("x86") {
            ndk.with {
                abiFilters += "x86"

                File curDir = file('./')
                curDir = file(curDir.absolutePath)
                String libsDir = curDir.absolutePath+"\\src\\main\\jniLibs\\x86\\" //"-L" +

                ldLibs += libsDir + "libnative_camera_r4.3.0.so"
                ldLibs += libsDir + "libopencv_contrib.a"
                ldLibs += libsDir + "libopencv_core.a"
                ldLibs += libsDir + "libopencv_highgui.a"
                ldLibs += libsDir + "libopencv_imgproc.a"
                ldLibs += libsDir + "libopencv_info.so"
                ldLibs += libsDir + "libopencv_java.so"
                ldLibs += libsDir + "libopencv_legacy.a"
                ldLibs += libsDir + "libopencv_ml.a"
                ldLibs += libsDir + "libopencv_ts.a"
            }
        }
        create("mips") {
            ndk.with {
                abiFilters += "mips"
            }
        }
        create("fat") {

        }
    }
}

dependencies {
    compile fileTree(include: ['*.jar'], dir: 'libs')
    compile 'com.android.support:appcompat-v7:23.0.1'
    compile project(':openCVLibrary2411')
}

这是我“应该”加载不同库的代码的一部分：

////// JNI C++
static {System.loadLibrary("Face");}

//Externals C++ Libraries
static {System.loadLibrary("libnative_camera_r4.3.0.so");}
static {System.loadLibrary("libopencv_contrib.a");}
static {System.loadLibrary("libopencv_core.a");}
static {System.loadLibrary("libopencv_highgui.a");}
static {System.loadLibrary("libopencv_imgproc.a");}
static {System.loadLibrary("libopencv_info.so");}
static {System.loadLibrary("libopencv_java.so");}
static {System.loadLibrary("libopencv_legacy.a");}
static {System.loadLibrary("libopencv_ml.a");}
static {System.loadLibrary("libopencv_ts.a");}

我现在有点卡住了，需要一些帮助。

编辑：在这个版本的 Android Studio 和实验插件中，我没有 Android.Mk 文件来编译 jni c++。所以我想知道现在是它自己完成还是我必须手动编译？

如果我没有 Android.Mk，我该如何手动操作？

Answer 1

您的构建确实成功，但您没有将共享库从 OpenCV 复制到应用程序的 libs 目录。遵循How to use opencv in android studio using gradle build tool?中的建议

请注意，可以将 Android.mk 的全部功能与 experimental 插件相结合：请参阅 define LOCAL_SRC_FILES in ndk{} DSL。