android studio: попытка вызвать виртуальный метод для нулевой ссылки на объект, при открытии действия для выполнения события в течение 2 минут

Question

package com.example.pinkconnect;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.provider.Settings;
import android.telephony.SmsManager;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.location.FusedLocationProviderClient;
import com.google.android.gms.location.LocationCallback;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationResult;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.tasks.OnCompleteListener;
import com.google.android.gms.tasks.Task;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;

public class HomeActivity extends AppCompatActivity {
    private SensorManager sm;
    private float acelVal, acelLast, shake;
    private static int counter = 0;
    int PERMISSION_ID = 44;
    FusedLocationProviderClient mFusedLocationClient;
    String latitude, longitude;
    DatabaseReference pne;
    Button btnLogout;
    DatabaseReference pinn;
    String pin;
    String pin1;
    String phoneu;
    int i=0;
    EditText t5;
    final Handler handler=new Handler();
    ArrayList<String> phoneNo = new ArrayList<String>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_home);
        t5=findViewById(R.id.t5);
        sm = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        sm.registerListener(sensorListener, sm.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
        acelVal = SensorManager.GRAVITY_EARTH;
        acelLast = SensorManager.GRAVITY_EARTH;
        shake = 0.00f;
        btnLogout = findViewById(R.id.logout);
        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);

        getLastLocation();
        btnLogout.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                FirebaseAuth.getInstance().signOut();
                Intent intToMain = new Intent(HomeActivity.this, MainActivity.class);
                startActivity(intToMain);
            }
        });
        Bundle bundle = getIntent().getExtras();

//Extract the data…
        String ids = bundle.getString("ids");
        pinn= FirebaseDatabase.getInstance().getReference(String.valueOf(ids)).child("pin");
        pinn.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                pin= (String) dataSnapshot.getValue();
//                String t=temp+"°C";
//                tv2.setText(t);
                Toast.makeText(HomeActivity.this,"pin is "+pin,Toast.LENGTH_LONG).show();
            }
            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
            }
        });
        do {
            pne = FirebaseDatabase.getInstance().getReference(String.valueOf(ids)).child("phone").child(String.valueOf(i));
            pne.addValueEventListener(new ValueEventListener() {
                @Override
                public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                    phoneu = (String) dataSnapshot.getValue();
//                String t=temp+"%";
//                tv4.setText(t);
//                    Toast.makeText(HomeActivity.this, "phone numbers are " + phoneu, Toast.LENGTH_LONG).show();
                    //for(int i=0;i<5;i++){
                    phoneNo.add(phoneu);
//  }
                    //Toast.makeText(HomeActivity.this, "nos" + phoneu.length(), Toast.LENGTH_LONG).show();

                }

                @Override
                public void onCancelled(@NonNull DatabaseError databaseError) {
                }
            });
            i++;}while(i<5);
//        Toast.makeText(HomeActivity.this, "phone numbers are " + phoneNo, Toast.LENGTH_LONG).show();
//        Toast.makeText(HomeActivity.this, "nos" + phoneu.length(), Toast.LENGTH_LONG).show();
    }

    private final SensorEventListener sensorListener = new SensorEventListener() {
        @Override
        public void onSensorChanged(SensorEvent event) {
            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];
            acelLast = acelVal;
            acelVal = (float) Math.sqrt((double) (x * x) + (y * y) + (z * z));
            float delta = acelVal - acelLast;
            shake = shake * 0.9f + delta;
            if (shake > 12) {
                counter++;
            }
            if (counter >= 3) {
                counter = 0;
                final SmsManager smsManager = SmsManager.getDefault();
                //String phoneNumbers[] = {"8220029986", "8431639251","7892096912"};

                //                String phoneNumbers=phoneu[];
                //phoneNumbers[]=//get from DB;
                //get Geolocation and set the custom text

/* do{//send sms
//enable the user to enter the pin
//get the pin from the EditText;
}while(pin.equals(Firebase pin));
*/
//                for (String phone : phoneNumbers) {

                do{

                /*    for(int m=0;m<5;m++){
                        //smsManager.sendTextMessage(phone, null, "sms message from pink connect" + latitude + longitude, null, null);
                        //https://www.latlong.net/c/?lat=0.000000&long=0.000000
                        //smsManager.sendTextMessage(phone, null, "Hey It's an emergency at this location"+"https://www.latlong.net/c/?lat="+latitude.toString()+"&long="+longitude.toString(), null, null);
                        //http://maps.google.com/maps?q=24.197611,120.780512
                        smsManager.sendTextMessage(phoneNo.get(m), null, "Hey It's an emergency at this location"+"http://maps.google.com/maps?q="+latitude.toString()+","+longitude.toString(), null, null);

                    }
*/
                    handler.postDelayed(new Runnable() {
                        @Override
                        public void run() {
                            //Do something after 2 mins
                            for(int m=0;m<5;m++){
                                smsManager.sendTextMessage(phoneNo.get(m), null, "Hey It's an emergency at this location"+"http://maps.google.com/maps?q="+latitude.toString()+","+longitude.toString(), null, null);

                            }
                        }
                    }, 120000);
                }while ((pin1.equals(pin.toString())));
                Toast t3 = Toast.makeText(getApplicationContext(), "Your Location has been sent to Your loved ones!!! Don't panic, Help will arrive soon", Toast.LENGTH_LONG);
                t3.show();
//                t1.setText(latitude);
//                t.setText(longitude);
            }
        }

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


    @SuppressLint("MissingPermission")
    private void getLastLocation(){
        if (checkPermissions()) {
            if (isLocationEnabled()) {
                mFusedLocationClient.getLastLocation().addOnCompleteListener(
                        new OnCompleteListener<Location>() {
                            @Override
                            public void onComplete(@NonNull Task<Location> task) {
                                Location location = task.getResult();
                                if (location == null) {
                                    requestNewLocationData();
                                } else {
                                    latitude= location.getLatitude()+"";
                                    longitude = location.getLongitude()+"";
                                }
                            }
                        }
                );
            } else {
                Toast.makeText(this, "Turn on location", Toast.LENGTH_LONG).show();
                Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
                startActivity(intent);
            }
        } else {
            requestPermissions();
        }
    }


    @SuppressLint("MissingPermission")
    private void requestNewLocationData(){

        LocationRequest mLocationRequest = new LocationRequest();
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
        mLocationRequest.setInterval(0);
        mLocationRequest.setFastestInterval(0);
        mLocationRequest.setNumUpdates(1);

        mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this);
        mFusedLocationClient.requestLocationUpdates(
                mLocationRequest, mLocationCallback,
                Looper.myLooper()
        );

    }

    private LocationCallback mLocationCallback = new LocationCallback() {
        @Override
        public void onLocationResult(LocationResult locationResult) {
            Location mLastLocation = locationResult.getLastLocation();
            latitude = mLastLocation.getLatitude()+"";
            longitude = mLastLocation.getLongitude()+"";
        }
    };

    private boolean checkPermissions() {
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED &&
                ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            return true;
        }
        return false;
    }

    private void requestPermissions() {
        ActivityCompat.requestPermissions(
                this,
                new String[]{Manifest.permission.ACCESS_COARSE_LOCATION, Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSION_ID
        );
    }

    private boolean isLocationEnabled() {
        LocationManager locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        return locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER) || locationManager.isProviderEnabled(
                LocationManager.NETWORK_PROVIDER
        );
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String[] permissions, int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (requestCode == PERMISSION_ID) {
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                getLastLocation();
            }
        }
    }

    @Override
    public void onResume(){
        super.onResume();
        if (checkPermissions()) {
            getLastLocation();
        }

    }
    //get pin
    public void stop(View view){
        pin1=t5.getText().toString();
    }
}

/*final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
  @Override
  public void run() {
    //Do something after 100ms
  }
}, 100);*/

в вышеприведенной кодировке я получаю ошибку как java .lang.NullPointerException: попытка вызвать виртуальный метод 'логический java .lang.String.equals (java .lang. Object) 'для пустой ссылки на объект com.example.pinkconnect.HomeActivity $ 4.onSensorChanged (HomeActivity. java: 174), my for l oop должен продолжать отправлять сообщения каждые 2 минуты при встряхивании устройства в течение 3 время, пока не будет выполнено условие while, в то время как l oop встречается, (Если я правильно введу пин-код в тексте редактирования "t5. Пожалуйста, помогите мне с этой ошибкой ...)