如何在ARcore中禁用表面检测？

Question

我在ARcore n android studio上遇到问题。我想禁用表面检测，以便在用户打开相机时显示对象。请帮我。

protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (!checkIsSupportedDeviceOrFinish(this)) {
        return;
    }
    setContentView(R.layout.activity_ux);
    arFragment = (ArFragment) getSupportFragmentManager().findFragmentById(R.id.ux_fragment);
    arFragment.getPlaneDiscoveryController().hide();
    arFragment.getPlaneDiscoveryController().setInstructionView(null);
    AR();


} // onCreate

private void AR() {
    ModelRenderable.builder()
            .setSource(this, R.raw.andy)
            .build()
            .thenAccept(renderable -> andyRenderable = renderable)
            .exceptionally(
                    throwable -> {
                        Toast toast =
                                Toast.makeText(this, "Unable to load andy renderable", Toast.LENGTH_LONG);
                        toast.setGravity(Gravity.CENTER, 0, 0);
                        toast.show();
                        return null;
                    });

    AnchorNode anchorNode = new AnchorNode();
    anchorNode.setParent(arFragment.getArSceneView().getScene());
    Node node = new Node();
    node.setRenderable(andyRenderable);
    //The z-axis is negative and is displayed in front of the camera
    node.setLocalPosition(new Vector3(getScreenCenter()));
    node.setParent(anchorNode);

} // AR

private Vector3 getScreenCenter() {
    View vw = findViewById(android.R.id.content);
    return new Vector3(vw.getWidth() / 2f, vw.getHeight() / 2f, 0f);
}

那是我的代码-很简单，但是不起作用。