使用NDK在android studio上构建本地openCV [英] Building native openCV with NDK on android studio

问题描述

我正在做一个C ++项目，它使用openCV，我希望在android studio上使用android NDK支持构建它。

在这样做时，我发现只有gradle的实验版本支持NDK。我目前使用版本0.2.1的gradle。我导入opencv作为一个模块，并将库复制到jniLibs文件夹下的src / main /

I am making a C++ project which uses openCV and I wish to build it on android studio using android NDK support.
On doing so I found out that only the experimental version of gradle supports NDK. I am currently using version 0.2.1 of gradle. I imported opencv as a module and copied the libraries to jniLibs folder under src/main/

我试图编译它，但我得到一些错误，如未定义的引用一些函数parallel.cpp的libopencv_core.a。
他们在导入第三方库时解决：libtbb.a

I tried to compile it but I got certain errors like undefined reference to some functions in parallel.cpp of libopencv_core.a . They were resolved on importing the third party library : libtbb.a

但是在运行它时我遇到了以下错误：

java.lang.UnsatisfiedLinkError：dlopen失败：找不到由libtracking_bits.so引用的符号__gnu_thumb1_case_si

But on running it I got the following errors:
java.lang.UnsatisfiedLinkError: dlopen failed: cannot locate symbol "__gnu_thumb1_case_si" referenced by "libtracking_bits.so"

是我的build.gradle：

here is my build.gradle :

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

model {
android {
    compileSdkVersion = 21
    buildToolsVersion = "22.0.1"

    defaultConfig.with {
        applicationId = "com.example.vlc.receiver"
        minSdkVersion.apiLevel = 16
        targetSdkVersion.apiLevel = 21
        versionCode = 1
        versionName = "1.0"


    }
}
android.buildTypes {
    release {
        minifyEnabled = false
        proguardFiles += file('proguard-rules.pro')
    }
    debug {
        minifyEnabled = false
    }
}
android.ndk {
    moduleName = "tracking_bits"

    cppFlags += "-fexceptions"
    cppFlags += "-frtti"
cppFlags  += "-I${file("OpenCV-android-sdk/sdk/native/jni/include")}".toString()
cppFlags  += "-I${file("OpenCV-android-sdk/sdk/native/jni/include/opencv")}".toString()

ldLibs += ["android", "EGL", "GLESv2", "dl", "log", "z"]// , "ibopencv_core"
stl = "gnustl_shared"

}


android.productFlavors {
create("arm") {
    ndk.with {
        abiFilters += "armeabi"

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

        ldLibs += libsDir + "libopencv_calib3d.a"
        ldLibs += libsDir + "libopencv_core.a"
        ldLibs += libsDir + "libopencv_features2d.a"
        ldLibs += libsDir + "libopencv_flann.a"
        ldLibs += libsDir + "libopencv_hal.a"
        ldLibs += libsDir + "libopencv_highgui.a"
        ldLibs += libsDir + "libopencv_imgcodecs.a"
        ldLibs += libsDir + "libopencv_imgproc.a"
        ldLibs += libsDir + "libopencv_java3.so"
        ldLibs += libsDir + "libopencv_ml.a"
        ldLibs += libsDir + "libopencv_objdetect.a"
        ldLibs += libsDir + "libopencv_photo.a"
        ldLibs += libsDir + "libopencv_shape.a"
        ldLibs += libsDir + "libopencv_stitching.a"
        ldLibs += libsDir + "libopencv_superres.a"
        ldLibs += libsDir + "libopencv_ts.a"
        ldLibs += libsDir + "libopencv_video.a"
        ldLibs += libsDir + "libopencv_videoio.a"
        ldLibs += libsDir + "libopencv_videostab.a"
        ldLibs += "OpenCV-android-sdk\\sdk\\native\\3rdparty\\libs\\armeabi\\libtbb.a"
    }
}
}

}

dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile 'com.android.support:appcompat-v7:22.2.1'
compile project(':openCVLibrary300')
}

我被卡住了。请帮助。

推荐答案

我添加了所有第三方库，这允许编译arm。公平地说，我还在jniLibs中添加了第三方库，只是为了避免改变你在那里的路径。

I added all the 3rd party libraries too and this allowed to compile for arm. To be fair, I also added the 3rd party libraries in jniLibs, just to avoid changing the path as you did up there. Otherwise, I have exactly the same configuration as you, to the point that I copied and pasted your file in a previous stage.

        ldLibs += libsDir + "libIlmImf.a"
        ldLibs += libsDir +  "liblibjpeg.a"
        ldLibs += libsDir + "liblibjasper.a"
        ldLibs += libsDir +"liblibpng.a"
        ldLibs += libsDir +"liblibwebp.a"

这篇关于使用NDK在android studio上构建本地openCV的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！