How to build a rotation gesture

Question

Hello on platform xamarin android app I tried to build a rotation gesture for ex open a ball valve i add an interface

namespace plx
{
    internal interface IONROTATIONGESTURELISTNER
    {
        void OnRotateStarted(MotionEvent Event);
        void OnRotateCompleted(MotionEvent Event);
        void OnRotate(MotionEvent Event, float angle);
    }
}
namespace plx
{
     class RotationGestureDetector
    {
        public RotationGestureDetector(IONROTATIONGESTURELISTNER listener)
        {
            
        }
        public bool OnTouchEvent(MotionEvent e)
        { 
           switch (e.ActionMasked) 
            
            { 
                case MotionEventActions.Down: return true;  
                    case MotionEventActions.Up: return true;
                case MotionEventActions.PointerDown: return true;
                    case MotionEventActions.PointerUp: return true;
                    case MotionEventActions.Move: return true;  
                    default: return false;  
            
            
            }
        }
    }
}

How i bind RotationGestureDetector class to an imageview Thanks

Answer 1

Hello,

For how to implement a custom gesture in Xamarin.Android and bind it to a view, the official documentation has provided specific instructions and use cases.

Please refer to the following documentation and sample:

• Touch in Android.
• Walkthrough - Using Touch in Android.

Best Regards,

Alec Liu.

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