android - 如何在Android中拖拽和删除ARCore节点？

Question

我有问题，我想在 ArFragment 中拖动和删除对象。我试图将 ontouchlistener 添加到每个节点，并将 ondraglistener 添加到删除区域。这是我的代码:

这是我的触摸监听器

    override fun onTouch(view: View, motionEvent: MotionEvent): Boolean {
        if (motionEvent.getAction() === MotionEvent.ACTION_DOWN) {
            val data = ClipData.newPlainText("", "")
            val shadowBuilder = View.DragShadowBuilder(
                view
            )
            view.startDrag(data, shadowBuilder, view, 0)
            view.setVisibility(View.INVISIBLE)
            return true
        } else {
            return false
        }
    }
}

这是我的删除区域的拖动监听器

internal class MyDragListener: View.OnDragListener {

    override fun onDrag(v: View, event: DragEvent): Boolean {
        when (event.getAction()) {
            DragEvent.ACTION_DRAG_STARTED -> {
                v.visibility = View.VISIBLE
            }
            DragEvent.ACTION_DRAG_ENTERED -> v.visibility = View.VISIBLE
            DragEvent.ACTION_DRAG_EXITED -> v.visibility = View.GONE
            DragEvent.ACTION_DROP -> {
            }
            DragEvent.ACTION_DRAG_ENDED -> v.visibility = View.GONE
            else -> {
            }
        }// do nothing
        return true
    }
}

这是我当前删除的节点(所有节点)

fun removeAllSticker(fragment: ArFragment) {
        val nodeList = ArrayList(fragment.getArSceneView().getScene().getChildren())
        for (childNode in nodeList) {
            if (childNode is AnchorNode) {
                if ((childNode as AnchorNode).anchor != null) {
                    (childNode as AnchorNode).anchor!!.detach()
                    fragment.getArSceneView().getScene().removeChild(childNode)
                    (childNode as AnchorNode).setParent(null)
                }
            }
        }
        cleanupFragment(fragment)
    }

    private fun cleanupFragment(fragment: ArFragment) {
        val scene = fragment.arSceneView.scene
        fragment.setOnTapArPlaneListener(null)
        scene!!.removeOnUpdateListener{
            fragment.onUpdate(it)
        }
    }

请帮帮我，我卡住了，已经在谷歌上搜索了

Answer 1

这是一个简单的代码 fragment ，展示了如何创建和删除节点:

AnchorNode anchorsNode = new AnchorNode(anchor);
anchorsNode.setParent(arFragment.getArSceneView().getScene());

Node holdNode = new Node();
holdNode.setParent(anchorsNode);
holdNode.setRenderable(yourModelRenderable);

holdNode.setOnTouchListener(new Node.OnTouchListener() {

    @override
    public boolean onTouch(HitTestResult hitTestResult, 
                             MotionEvent motionEvent) {

        anchorsNode.removeChild(holdNode);
        return true;
    }
});

或者，您可以使用来自 this 的示例代码 发布。

如果您想知道如何在 ARCore 中拖动节点，请阅读 this RW 帖子。