MainActivity.java

package com.example.mh.locationapp;

import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;

import android.Manifest;
import android.content.Context;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationListener;
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 implements LocationListener {
    LocationManager manager;
    TextView tv;
    Button getLocation;
    private static final int PERMISSION = 200;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        tv = findViewById(R.id.textview1);
        getLocation = findViewById(R.id.button);
        manager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
        getLocation.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if (ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                    ActivityCompat.requestPermissions(MainActivity.this, new String[] {
                            Manifest.permission.ACCESS_FINE_LOCATION
                    }, PERMISSION);
                } else {
                    manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, MainActivity.this);
                }
            }
        });


    }

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
           if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION)
                    == PackageManager.PERMISSION_GRANTED) {
                manager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
            } else {
               Toast.makeText(this, "Can't access location without permission", Toast.LENGTH_SHORT).show();
           }
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        tv.setText("Latitude: " + location.getLatitude() + "\nLongitude: " + location.getLongitude() + "\nAltitude: " + location.getAltitude());

    }

    @Override
    public void onStatusChanged(String s, int i, Bundle bundle) {

    }

    @Override
    public void onProviderEnabled(String s) {

    }

    @Override
    public void onProviderDisabled(String s) {

    }
}