Android Plugin and StepSensor, Why my methods on java arent called from my c# script?

Hi! Thanks for read . Im developing a game where i need to know how many steps the player did in a period of time. I have a java application that count the number of steps(Developed on android studio):

     public class MainActivity extends UnityPlayerActivity implements SensorEventListener {
     private SensorManager sensorManager;
     private TextView count;
     private int initialSteps;
     private  int finalSteps;
     boolean activityRunning;
     public int number;
 
 
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
        // setContentView(R.layout.activity_main);
         //count = (TextView) findViewById(R.id.count);
         sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
 
     }
 
 
     @Override
     protected void onResume() {
         super.onResume();
         activityRunning = true;
         Sensor countSensor = sensorManager.getDefaultSensor(Sensor.TYPE_STEP_COUNTER);
         if (countSensor != null) {
             sensorManager.registerListener(this, countSensor, SensorManager.SENSOR_DELAY_UI);
         } else {
             Toast.makeText(this, "Count sensor not available!", Toast.LENGTH_LONG).show();
         }
 
     }
 
     @Override
     protected void onPause() {
         super.onPause();
         activityRunning = false;
         // if you unregister the last listener, the hardware will stop detecting step events
 //        sensorManager.unregisterListener(this);
     }
 
     @Override
     public void onSensorChanged(SensorEvent event) {
         if (activityRunning) {
             if(initialSteps<1)
             {
                 initialSteps=(int)event.values[0];
             }
             finalSteps=(int)event.values[0]-initialSteps;
            // count.setText(String.valueOf(finalSteps));
         }
 
     }
 
     @Override
     public void onAccuracyChanged(Sensor sensor, int accuracy) {
     }
 
 
      public int getMySteps(){
        return finalSteps;
     }
 }

As you can see at the bottom i have a method called getMySteps. This method should return the steps that the user do.

Now in unity i have this script:

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class mylalal : MonoBehaviour {
     AndroidJavaClass androidClass;
     public int yolo;
     public Text myText;
 
 
     // Use this for initialization
     void Start () {
         yolo = 1;
         AndroidJNI.AttachCurrentThread ();
         androidClass= new AndroidJavaClass("com.example.never.stepcountera.MainActivity");
         myText.text="Pasos: "+yolo;
     
     }
     
     // Update is called once per frame
     void Update () {
     }
 
     public void MyInt(){
         yolo=androidClass.Call<int>("getMySteps");
         myText.text = "Pasos: "+yolo;
 
     }
 }

As you can see i acces to the method in java using in unity my method called MyInt, this method start when i click a button. My surprise is that when i press the button my variable int yolo is equal to cero, my variable neever get the correct valor, is always 0(This variable start equal to 1 on my c# script); I have tried to return an specific number, but dont work, is always 0, and in the unity editor dont appear any error and in my phone no FC too.

Sorry for my bad english If someone can help me please! I need return the final steps to my c# script.