Detect person's fall with Android

Question

Good morning,

I'm new in Android development, before I deveped some application/website in C#/ASP.NET with Microsoft SQL Server. Now I've to develop a Android application to detect when I person falls down and send an alarm. I found an examples like this:

public class MainActivity extends Activity implements SensorEventListener{
    private SensorManager sensorManager;
    TextView text_X;
    TextView text_Y;
    TextView text_Z;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        sensorManager.registerListener(this, sensorManager.getDefaultSensor( Sensor.TYPE_ACCELEROMETER ),SensorManager.SENSOR_DELAY_NORMAL );
        //Collegamento con le textView del layout
        text_X=(TextView)findViewById(R.id.txtXValue);
        text_Y=(TextView)findViewById(R.id.txtYValue);
        text_Z=(TextView)findViewById(R.id.txtZValue);
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
        if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
            //L'accelerometro ha cambiato stato
            mostraValori(event);
        }

    }   

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {

    }

    private void mostraValori(SensorEvent event){
        float[] valori=event.values;//array che contiene i valori dell'accelerometro
        //modifica del valore delle textView

        text_X.setText("Valore X: "+valori[0]);
        text_Y.setText("Valore Y: "+valori[1]);
        text_Z.setText("Valore Z: "+valori[2]);

    }
}

So I've accelerometer's X, Y and Z values on the screen. Now what is the next step?

Thank you.

Answer 1

IMHO, the next step is for you to decide what profile of accelerometer values over a time period represent a "fall", in a way that minimizes false positives and false negatives. This will need to take into account the sort of device that is being used (tablet? phone? watch? glasses?) and how it is being used (phone in hand? phone in pocket? phone in purse?).