Problems at R.styleable while integrating native opencv to android studio

Question

I'm addind openCV native lib into my (in developpement) project. I'm following this guide. I have troubles at the very last step, while building my project, in the OpenCV-android-sdk folder : CameraGLSurfaceView.java got error cannot find symbol variable styleable at R.styleable.CameraBridgeViewBase.

I have tried to add an attrs.xml file in my values folder with this content :

<?xml version="1.0" encoding="utf-8"?>
<resources>
   <declare-styleable name = "CameraBridgeViewBase" >
        <attr name="show_fps" format="boolean"/>
        <attr name="camera_id" format="integer" >
            <enum name="any" value="-1" />
            <enum name="back" value="2" />
            <enum name="front" value="1" />
        </attr>
    </declare-styleable>
</resources>

As it said in this quite similar error. But nothing changed when I rebuild my project.

Answer 1

In opencv 4 just change

res.srcDirs = ['/build/master_pack-android/opencv/modules/java/android_sdk/android_gradle_lib/res']

to

res.srcDirs = ['res']

in the gradle file