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The solarsystem case can make node rotate and I want to know how to animate an Object up and down？
This is the solarsystem case code:

Quaternion orientation1 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 0);

Quaternion orientation2 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 120);

Quaternion orientation3 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 240);

Quaternion orientation4 = Quaternion.axisAngle(new Vector3(0.0f, 1.0f, 0.0f), 360);

ObjectAnimator orbitAnimation = new ObjectAnimator();

orbitAnimation.setObjectValues(orientation1, orientation2, orientation3, orientation4);

orbitAnimation.setPropertyName("localRotation");

orbitAnimation.setEvaluator(new QuaternionEvaluator());

orbitAnimation.setRepeatCount(ObjectAnimator.INFINITE);

orbitAnimation.setRepeatMode(ObjectAnimator.RESTART);

orbitAnimation.setInterpolator(new LinearInterpolator());

orbitAnimation.setAutoCancel(true);

I believe, It is the wrong consideration. Because ObjectAnimator can only animate subclass of View (like TextView, Button etc). But doesn't include Node.
According to Documentation,

A Node represents a transformation within the scene graph's hierarchy.
It can contain a renderable for the rendering engine to render.

You need more research about Node to make rotate

I work in this code:

Vector3 vector1 = new Vector3(getRandom(), getRandom(), playNode.getLocalPosition().z);

    ObjectAnimator dropAnimation = new ObjectAnimator();

    dropAnimation.setObjectValues(vector1);

    dropAnimation.setPropertyName("localPosition");

    dropAnimation.setEvaluator(new Vector3Evaluator());

    dropAnimation.setRepeatCount(ObjectAnimator.INFINITE);

    dropAnimation.setRepeatMode(ObjectAnimator.RESTART);

    dropAnimation.setInterpolator(new LinearInterpolator());

    dropAnimation.setAutoCancel(true);



    return dropAnimation;