Step counter

package com.example.mycustomstepcounter; import androidx.appcompat.app.AppCompatActivity; import android.content.SharedPreferences; import android.hardware.Sensor; import android.hardware.SensorEvent; import android.hardware.SensorEventListener; import android.hardware.SensorManager; import android.os.Bundle; import android.widget.TextView; public class MainActivity extends AppCompatActivity { private TextView textView; private double MagnitudePrevious = 0; private Integer stepCount = 0; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); textView = findViewById(R.id.textView); SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE); Sensor sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); SensorEventListener stepDetector = new SensorEventListener() { @Override public void onSensorChanged(SensorEvent sensorEvent) { if (sensorEvent!= null){ float x_acceleration = sensorEvent.values[0]; float y_acceleration = sensorEvent.values[1]; float z_acceleration = sensorEvent.values[2]; double Magnitude = Math.sqrt(x_acceleration*x_acceleration + y_acceleration*y_acceleration + z_acceleration*z_acceleration); double MagnitudeDelta = Magnitude – MagnitudePrevious; MagnitudePrevious = Magnitude; if (MagnitudeDelta > 6){ stepCount++; } textView.setText(stepCount.toString()); } } @Override public void onAccuracyChanged(Sensor sensor, int i) { } }; sensorManager.registerListener(stepDetector, sensor, SensorManager.SENSOR_DELAY_NORMAL); } protected void onPause() { super.onPause(); SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE); SharedPreferences.Editor editor = sharedPreferences.edit(); editor.clear(); editor.putInt(“stepCount”, stepCount); editor.apply(); } protected void onStop() { super.onStop(); SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE); SharedPreferences.Editor editor = sharedPreferences.edit(); editor.clear(); editor.putInt(“stepCount”, stepCount); editor.apply(); } protected void onResume() { super.onResume(); SharedPreferences sharedPreferences = getPreferences(MODE_PRIVATE); stepCount = sharedPreferences.getInt(“stepCount”, 0); } }