如何在NDK的opencv本机的gradle gradle构建中修复gradle任务':app:mergeDebugJniLibFolders'? [英] How to fix gradle task ':app:mergeDebugJniLibFolders' in flutter gradle build for opencv native with NDK?

问题描述

我正在设置一个新的flutter应用程序，我想使用NDK添加opencv本机(c ++)插件.

I'm setting up a new flutter app and I want to add opencv native (c++) plugin using NDK.

我已经安装并配置了OpenCV和NDK(使用不同的教程)，而我在尝试构建项目(flutter run)时遇到此错误:

I've installed and configured OpenCV and NDK (using differents tutorials) and I got this error while I'm trying to build my project (flutter run):

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:mergeDebugJniLibFolders'.
> java.lang.NullPointerException (no error message)

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or -- 
debug option to get more log output. Run with --scan to get full insights.

* Get more help at https://help.gradle.org

BUILD FAILED in 31s
Finished with error: Gradle task assembleDebug failed with exit code 1

我不知道它来自哪里，我的应用程序build.gradle中没有任务" mergeDebugJniLibFolders. 我不能用指定的参数来颤动:它会出错.

I don't know where it come from, there is no 'task' mergeDebugJniLibFolders in my build.gradle from my app. I can't run flutter with specified arguments : it make errors.

推荐答案

我找到了解决方案！

我进入build.gradle这些行:

sourceSets {
    main {
        jniLibs.srcDirs = ['src/main/libs']
        java.srcDirs = ['src']
        ...
    }
 }

所以我决定打开仅包含

../../../../OpenCV-Andoid-sdk/native/libs/

...应该是错误的路径:

... a wrong path that should be :

../../../../sdk/native/libs/

我将corect路径放入gradle文件中，尊重新的相对路径:

I put the corect path into the gradle file respecting the new relative path :

sourceSets {
    main {
        jniLibs.srcDirs = ['../../sdk/native/libs/']
        java.srcDirs = ['src']
        ...
    }
 }

现在，它可以完美编译了！我度过了六个晚上真是一个棘手的错误...

And now it compile perfectly ! What a tricky error on which I spend 6 evenings...

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