Android的工作室，OpenCV的罐子，抛出java.lang.ClassNotFoundException：org.opencv.R $设置样式 [英] Android Studio, OpenCV jar, java.lang.ClassNotFoundException: org.opencv.R$styleable

问题描述

有关如何使用OpenCV的与Android工作室涉及进口OpenCV的模块项目在网络上的大多数例子。不过，我想使用的OpenCV作为一个罐子，让我避免弄乱我的源代码控制库与OpenCV的副本。

Most examples on the web regarding how to use OpenCV with Android Studio involve importing the OpenCV module into your project. However, I am trying to use OpenCV as a jar so that I avoid cluttering my source control repository with copies of OpenCV.

因此​​，这些都是我做我的应用程序被称为应用。

So these are the steps I am doing for my app called 'app'.

一个。在创建/项目/应用一个libs目录。把OpenCV的罐子在那里。也把OpenCV的本地库在那里，在子目录。

A. Create a libs directory under /Project/apps. Put the OpenCV jar there. Also put the opencv native libs there, in sub-directories.

乙。在/Project/app/build.gradle执行以下操作

B. In /Project/app/build.gradle do the following

把这些线在顶部：

repositories { flatDir { dirs 'libs'    } }

把这些线在android部分：

Put these lines in the android section:

sourceSets.main.jniLibs.srcDirs = ['libs']

将这个线的依赖性部分：

Put this line in the dependencies section:

    compile fileTree(dir: 'libs', include: ['*.jar'])

℃。添加这些行AndroidManifest.xml中，应用程序标记之后。

C. Add these lines to AndroidManifest.xml, after the application tag.

    <uses-sdk android:minSdkVersion="9"/>
    <uses-permission android:name="android.permission.CAMERA"/>
    <uses-feature android:name="android.hardware.camera" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.front" android:required="false"/>
    <uses-feature android:name="android.hardware.camera.front.autofocus" android:required="false"/>

Ð。不知道这是否是必需的或没有，我已经试过与无 - 似乎没有什么区别：我添加以下行应用程序标签中在AndroidManifest.xml：

D. Not sure if this is required or not, I've tried with and without - seems to make no difference: I add the following line inside the application tag in AndroidManifest.xml:

        <uses-library android:name="org.opencv.android.JavaCameraView" />

电子。最后，这是我的布局XML：

E. Finally here is my layout xml:

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:opencv="http://schemas.android.com/apk/lib/org.opencv.android.JavaCameraView"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <org.opencv.android.JavaCameraView
        android:layout_width="fill_parent"
        android:layout_height="fill_parent"
        android:visibility="gone"
        android:id="@+id/main_activity_surface_view"
        opencv:show_fps="true"
        opencv:camera_id="any" />

    </LinearLayout>

这一切工作正常。我可以在我的活动中引用OpenCV的没有错误。然而，布局编辑器提供了以下错误：以下类不能被实例化：org.opencv.android.JavaCameraView。抛出java.lang.ClassNotFoundException：org.opencv.R $设置样式

This all works fine. I can reference OpenCV in my activity without errors. However the layout editor gives the following error: The following classes could not be instantiated: org.opencv.android.JavaCameraView. java.lang.ClassNotFoundException: org.opencv.R$styleable.

如果这只是一个显示问题也许我可以不理它，但是当我运行出现类似的错误。

If it was just a rendering problem perhaps I could ignore it, however a similar error occurs when I run it.

我是什么失踪？

（我知道有些类似的问题，在SO对于这个错误，但他的解决方案涉及导入整个模块，它确实工作，但为precisely我想要避免的。）

(I am aware of a somewhat similar question in SO regarding this error, but his solution involves importing the whole module which does indeed work but is precisely what I'm trying to avoid.)

推荐答案

的错误消息：

以下类不能被实例化：org.opencv.android.JavaCameraView。抛出java.lang.ClassNotFoundException：org.opencv.R $设置样式

The following classes could not be instantiated: org.opencv.android.JavaCameraView. java.lang.ClassNotFoundException: org.opencv.R$styleable

指示操作的构建当没有找到的OpenCV资源。如果你的OpenCV包括作为一个jar库，这将是问题的根源 - 罐子没有资源在他们的

indicates that it isn't finding OpenCV resources when doing the build. If you're including OpenCV as a jar library, that will be the source of the problem -- jars don't have resources in them.

的解决方案是构建的OpenCV为AAR，因为AARS做有资源。构建库模块，它编译成AAR，到处重用存档需要。

The solution is to build OpenCV as an AAR, because AARs do have resources. Construct a library module for it, compile it to AAR, and reuse that archive everywhere you need to.

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