how to check if device is moved during last 1 minute using accelerometer xamarin

Question

Hi there ,
am looking for method to detect if device not moved, while last 1 minute using accelerometer xamarin

        public double oldx,newx;

        protected override void OnAppearing()
        {

            base.OnAppearing();

             if (Accelerometer.IsMonitoring)
                Accelerometer.Stop();
            else
                Accelerometer.Start(SensorSpeed.UI);

            Accelerometer.ReadingChanged += Accelerometre_ReadingChanged;
            void Accelerometre_ReadingChanged(object sender, AccelerometerChangedEventArgs e)
            {
                oldx = e.Reading.Acceleration.X;
            }

            Device.StartTimer(new TimeSpan(0, 1, 0), () =>
            {

                Accelerometer.ReadingChanged += Accelerometre_ReadingChanged1;
                void Accelerometre_ReadingChanged1(object sender, AccelerometerChangedEventArgs ee)
                {
                    newx = ee.Reading.Acceleration.X;
                }

          if(oldx != newx){
         // do somth......
//the problem here always oldx==newx           
}
        });
        }

the problem is when i compare oldx and newx always the same value , but i want to check if the mobile device cordiante change after 1 minute any solutions pls , thanks in advance.

Answer 1

Looking at your code.

         Device.StartTimer(new TimeSpan(0, 1, 0), () =>
         {

             Accelerometer.ReadingChanged += Accelerometre_ReadingChanged1;

You are adding a second event handler to ReadingChanged so both Accelerometre_ReadingChanged1 and Accelerometre_ReadingChanged will get same data causing oldx and newx will be the same. You could try removing the old eventhandler before adding the new one in the timer.

         Device.StartTimer(new TimeSpan(0, 1, 0), () =>
         {
             Accelerometer.ReadingChanged -= Accelerometre_ReadingChanged;

             Accelerometer.ReadingChanged += Accelerometre_ReadingChanged1;