Help. Unable to get EGL14.eglGetCurrentContext() in Unity single threaded mode

Unity Engine
,
1

As per the tittle, I am unable to get the EGL14.eglGetCurrentContext() inside an Android Java class. More precisely, the returned context is equal to EGL14.EGL_NO_CONTEXT.

My interpretation is that the code is called from the main Unity thread yet the code is not able to get the OpenGL context.

Multithreaded rendering is disabled. The project is a Unity project exported to Android. This C# code calls the Java initSurface method from an Update function of a MonoBehavior:

private void Update()
    {
        if (_camMonitorInstance == null)
        {
            // it is important to call this in update method. Single Threaded Rendering will run in UnityMain Thread
            InitAndroidSurface(camWidth, camHeight);
        }
        else
        {
            _camMonitorInstance.Call("updateSurfaceTexture");
        }
    }

This should ensure that it will be called from the UnityMain thread. I am very confident that the thread is UnityMain because in updateSurfaceTexture Thread.currentThread().getName().equals(“UnityMain”) is true.

private void initSurface() {
        unityContext = EGL14.eglGetCurrentContext();
        unityDisplay = EGL14.eglGetCurrentDisplay();
        unityDrawSurface = EGL14.eglGetCurrentSurface(EGL14.EGL_DRAW);
        unityReadSurface = EGL14.eglGetCurrentSurface(EGL14.EGL_READ);

        if (unityContext == EGL14.EGL_NO_CONTEXT) {
            Log.e(TAG, "UnityEGLContext is invalid -> Most probably wrong thread");
        }

        EGL14.eglMakeCurrent(unityDisplay, unityDrawSurface, unityReadSurface, unityContext);

        GLES20.glActiveTexture(GLES20.GL_TEXTURE0);
        GLES20.glBindTexture(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, _unityTextureId);
        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MIN_FILTER, GLES20.GL_LINEAR);
        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_MAG_FILTER, GLES20.GL_LINEAR);
        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_S, GLES20.GL_CLAMP_TO_EDGE);
        GLES20.glTexParameterf(GLES11Ext.GL_TEXTURE_EXTERNAL_OES, GLES20.GL_TEXTURE_WRAP_T, GLES20.GL_CLAMP_TO_EDGE);
        _surfaceTexture = new SurfaceTexture(_unityTextureId);
        _surfaceTexture.setDefaultBufferSize(_textureWidth, _textureHeight);
        _surface = new Surface(_surfaceTexture);
        _surfaceTexture.setOnFrameAvailableListener(this);
    }
2

Bump.

3

UPDATE V1:

Everything works in emulators but not on real devices.