accelerometer - Android Fall detection

Question

I am implementing the fall detection using accelerometer sensor, and create below code.

  public void onSensorChanged(SensorEvent foEvent) {


        if (foEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            double loX = foEvent.values[0];
            double loY = foEvent.values[1];
            double loZ = foEvent.values[2];

            double loAccelerationReader = Math.sqrt(Math.pow(loX, 2)
                    + Math.pow(loY, 2)
                    + Math.pow(loZ, 2));
            mlPreviousTime = System.currentTimeMillis();
            Log.i(TAG, "loX : " + loX + " loY : " + loY + " loZ : " + loZ);
            if (loAccelerationReader <= 6.0) {
                moIsMin = true;
                Log.i(TAG, "min");
            }

            if (moIsMin) {
                i++;
                Log.i(TAG, " loAcceleration : " + loAccelerationReader);
                if (loAccelerationReader >= 30) {
                    long llCurrentTime = System.currentTimeMillis();
                    long llTimeDiff = llCurrentTime - mlPreviousTime;
                    Log.i(TAG, "loTime :" + llTimeDiff);
                    if (llTimeDiff >= 10) {
                        moIsMax = true;
                        Log.i(TAG, "max");
                    }
                }

            }

            if (moIsMin && moIsMax) {
                Log.i(TAG, "loX : " + loX + " loY : " + loY + " loZ : " + loZ);
                Log.i(TAG, "FALL DETECTED!!!!!");
                Toast.makeText(this, "FALL DETECTED!!!!!", Toast.LENGTH_LONG).show();
                i = 0;
                moIsMin = false;
                moIsMax = false;
            }

            if (i > 5) {
                i = 0;
                moIsMin = false;
                moIsMax = false;
            }
        }        
}

its give me fall detected, but if i am riding or running it will also give me fall alert.

if i throw device from 6 inch, alert shown.

I also see the sensitivity is device specific.

when i test moto e and mi 4 with same height

Moto e return maximum 32 value for loAccelerationReader

and in mi 4 it will return 60 value for loAccelerationReader

can any one help me out for the correct way.

Answer 1

I got some solution not sure its work for all or not, but i am using below code and its working for me.

if (foEvent.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {

        double loX = foEvent.values[0];
        double loY = foEvent.values[1];
        double loZ = foEvent.values[2];

        double loAccelerationReader = Math.sqrt(Math.pow(loX, 2)
                + Math.pow(loY, 2)
                + Math.pow(loZ, 2));

        DecimalFormat precision = new DecimalFormat("0.00");
        double ldAccRound = Double.parseDouble(precision.format(loAccelerationReader));

        if (ldAccRound > 0.3d && ldAccRound < 0.5d) {
           //Do your stuff
        }
   }