ScaleGestureDetector.IOnScaleGestureListener C＃Xamarin问题

如何解决ScaleGestureDetector.IOnScaleGestureListener C＃Xamarin问题

我正在构建一个应用程序，该应用程序允许用户在Xamarin android .net中移动2个textview。 一切正常，除了onScale（捏手势）。调试显示从未调用IOnScaleGestureListener函数（这就是为什么我将它们留为空白）的原因。有人知道我需要怎么打电话吗？ 主要活动

    public class MainActivity : AppCompatActivity,IOnTouchListener,IOnGestureListener,ScaleGestureDetector.IOnScaleGestureListener 
    {
        int position = 0;
        private List<TextView> txtGestureView = new List<TextView>();
        private GestureDetector gestureDetector;
        private ScaleGestureDetector scaleDetector;

        protected override void OnCreate(Bundle savedInstanceState)
        {
            base.OnCreate(savedInstanceState);
            Xamarin.Essentials.Platform.Init(this,savedInstanceState);
            SetContentView(Resource.Layout.activity_main);
            RelativeLayout.LayoutParams lps = new RelativeLayout.LayoutParams(400,400);
            txtGestureView.Add(FindViewById<TextView>(Resource.Id.imageView));
            txtGestureView.Add(FindViewById<TextView>(Resource.Id.imageView2));
            RelativeLayout relativeLayout = FindViewById<RelativeLayout>(Resource.Id.relativeLayout1);
            gestureDetector = new GestureDetector(this);
            scaleDetector = new ScaleGestureDetector(this,this);
            txtGestureView[0].SetonTouchListener(this);
            txtGestureView[0].Tag = "0";
            txtGestureView[1].SetonTouchListener(this);
            txtGestureView[1].Tag = "1";
        }
        public bool OnTouch(View v,MotionEvent e)
        {
            position = int.Parse(v.Tag.ToString(),0);
            return gestureDetector.OnTouchEvent(e);
        }
        public bool OnScroll(MotionEvent e1,MotionEvent e2,float distanceX,float distanceY)
        {
            float diffY = e2.GetY() - e1.GetY();
            float diffX = e2.GetX() - e1.GetX();
            txtGestureView[position].SetX(txtGestureView[position].GetX() + diffX);
            txtGestureView[position].SetY(txtGestureView[position].GetY() + diffY);
            return true;
        }
        public bool OnDown(MotionEvent e) { return true; }
        public bool OnFling(MotionEvent e1,float veLocityX,float veLocityY) { return true; }
        public void OnLongPress(MotionEvent e) { }
        public void OnShowPress(MotionEvent e) { }
        public bool OnSingleTapUp(MotionEvent e) { return true; }

        public bool OnScale(ScaleGestureDetector detector)
        {
            return true;
        }

        public bool OnScaleBegin(ScaleGestureDetector detector)
        {
            return true;
        }

        public void OnScaleEnd(ScaleGestureDetector detector)
        {

        }
    }

xml文件

<?xml version="1.0" encoding="utf-8"?>    
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"    
                xmlns:app="http://schemas.android.com/apk/res-auto"    
                xmlns:tools="http://schemas.android.com/tools"    
                android:layout_width="match_parent"  
                android:layout_height="match_parent"    
                tools:showIn="@layout/activity_main"
    android:id="@+id/relativeLayout1">    
    
                 <TextView    
                android:id="@+id/imageView"    
                android:layout_width="200dp"    
                android:text="imageView"    
        android:layout_centerHorizontal="true"
                android:textSize="35dp"    
        android:layout_marginTop="100dp"
                android:gravity="center"      
                android:background="@android:color/black"    
                android:textColor="@android:color/white"    
                android:layout_height="50dp"/>   
    
                 <TextView    
                android:id="@+id/imageView2"    
                android:layout_width="200dp"    
                android:text="imageView2"    
                android:textSize="35dp"    
                android:gravity="center"    
                android:layout_centerInParent="true"    
                android:textColor="@android:color/white"    
                android:background="@android:color/black"    
                android:layout_height="50dp"/>
    
</RelativeLayout>   

解决方法

问题出在OnTouch() 我回来了 return gestureDetector.OnTouchEvent(e); 代替 return scaleDetector.OnTouchEvent(e);

为什么没有此功能：

        public bool OnScale(ScaleGestureDetector detector)
        {
            return true;
        }

        public bool OnScaleBegin(ScaleGestureDetector detector)
        {
            return true;
        }

        public void OnScaleEnd(ScaleGestureDetector detector)
        {

        }

被叫。