android 倾斜view 手动转动动画 随手势左右转动

activity：

package com.manss.myapplication
import android.annotation.SuppressLint
import android.os.Bundle
import android.view.MotionEvent
import android.view.View
import android.view.View.OnTouchListener
import android.widget.RelativeLayout
import androidx.appcompat.app.AppCompatActivity

class RotateActivity : AppCompatActivity(), OnTouchListener {
    private var mRoot: RelativeLayout? = null
    private var mCircle: RelativeLayout? = null
    var i = 0
    var viewRotation = 0f
    var fingerRotation = 0.0
    var newFingerRotation = 0.0
    private var mImage: View? = null
    @SuppressLint("ClickableViewAccessibility")
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_rotate_image)
        mRoot = findViewById(R.id.root)
        mCircle = findViewById(R.id.circle)
        mImage = findViewById(R.id.rotate_image_image)
        mRoot?.setOnTouchListener(this)
        val mIndex = intArrayOf(0)
    }
    override fun onTouch(v: View, event: MotionEvent): Boolean {
        val x = event.x
        val y = event.y
        //以控件中心为旋转中心
        val xc = mRoot!!.width / 2.toFloat()
        val yc = mRoot!!.height / 2.toFloat()
        when (event.action) {
            MotionEvent.ACTION_DOWN -> {
                viewRotation = mCircle!!.rotation //记录当前点击时的角度
                fingerRotation = Math.toDegrees(
                    Math.atan2(
                        x - xc.toDouble(),
                        yc - y.toDouble()
                    )
                )
            }
            MotionEvent.ACTION_MOVE -> {
                newFingerRotation = Math.toDegrees(
                    Math.atan2(
                        x - xc.toDouble(),
                        yc - y.toDouble()
                    )
                )
                mCircle!!.rotation = (viewRotation + newFingerRotation - fingerRotation).toFloat()
            }
            MotionEvent.ACTION_UP -> {
                newFingerRotation = 0.0
                fingerRotation = newFingerRotation
            }
        }
        return true
    }
}

android:rotationX="25"