public class MainActivity extends AppCompatActivity implements SensorEventListener {
    private final int PHYISCAL_ACTIVITY = 0;
    private TextView Steps;
    private SensorManager sensorManager;
    private Sensor mCountStep;
    int CountSteps;

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        if (ContextCompat.checkSelfPermission(this,
                Manifest.permission.ACTIVITY_RECOGNITION) == PackageManager.PERMISSION_DENIED) {

            requestPermissions(new String[]{Manifest.permission.ACTIVITY_RECOGNITION}, PHYISCAL_ACTIVITY);
        }
        getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
        Steps = findViewById(R.id.textKroki);
        sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
        mCountStep = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);


    }

    @Override
    public void onSensorChanged(SensorEvent sensorEvent) {
        if (sensorEvent.sensor == mCountStep) {
            CountSteps = (int) sensorEvent.values[0];
            Steps.setText(String.valueOf(CountSteps));
        }
    }

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

    }

    @Override
    protected void onResume() {
        super.onResume();
        if (sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER) != null) {

            sensorManager.registerListener(this, mCountStep, SensorManager.SENSOR_DELAY_NORMAL);
        }
    }

    @Override
    protected void onPause() {
        super.onPause();

        }


    @Override
    protected void onDestroy() {

        super.onDestroy();
        sensorManager.unregisterListener(this, mCountStep);

    }