How to display the phone's XYZ coordinates dynamically in Android Studio?

I want to display the coordinates on the phone screen dynamically as the user moves the phone. I want this to happen as soon as the app is turned on, without the user having to press any buttons. I guess the closest to an XYZ coordinates would be the lat/long? But I don’t know how to loop it so that it immediately starts in OnCreate() and will last as long as the app is on.

Here’s what I have right now in, which I think is probably wrong:

package com.example.musicapp1;


import android.Manifest;
import android.location.Location;
import android.location.LocationManager;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends AppCompatActivity {

    LocationManager lm;
    Location location;
    double longitude, latitude;
    TextView coor;

    protected void onCreate(Bundle savedInstanceState) {

        lm = (LocationManager) getSystemService(this.LOCATION_SERVICE);
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
        location = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
        longitude = location.getLongitude();
        latitude = location.getLatitude();

        coor.setText("longitude: " + longitude + ", latitude: " + latitude);

When I try it on my phone, the textview coor just says the default text textview and doesn’t show the lat/long at all. I already have these permissions in my AndroidManifest.xml file:

<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET"/>

Is there a way to do this? It doesn’t have to be lat/long, I’m prioritizing the phone’s XY coordinates only. (I’m very new to Android Studio.)

Thank you.