(Android) No puedo hacer que el búfer de profundidad funcione en opengl es2

I already spent several hours trying to make depth buffer work, but no luck. Initialization code:

class MyGLSurfaceView extends GLSurfaceView {
public BasicGLSurfaceView(Context context) {
    super(context);
    [...]
    setEGLContextClientVersion(2);
    setEGLConfigChooser(8, 8, 8, 8, 16, 0);
    [...]
    m_rend = new ViewRenderer(context, m_app);
    setRenderer(m_rend);
}

rendering funcrtion looks like this:

public void Render() {
        [...]
    GLES20.glClearColor(m_backColor.x(), m_backColor.y(), m_backColor.z(), 1.0f);
    GLES20.glClearDepthf(1.0f);
    GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT | GLES20.GL_DEPTH_BUFFER_BIT);
        [...]
    GLES20.glEnable(GLES20.GL_DEPTH_TEST);
    GLES20.glDepthFunc(GLES20.GL_LEQUAL);
    GLES20.glDepthMask(true);
    GLES20.glDepthRangef(m_depthNear, m_depthFar);
        [...]
        [...rendering...]
}

I assume that there are two things can be wrong: first is depth buffer wasn't initialized successfully, but setEGLConfigChooser returns no error, and second if I setup rendering states incorrrectly. What's wrong with my code?

BTW. I've made it work in my NativeActivity project, but i can't do the same in java :(

Gracias de antemano!