كيف استطيع عمل تحديث للا activity بعد طلب اذن GPS

مرحبا اخواني الكرام

اعمال على نظام خرائط وهو شغال ميه ميه ولكن توجد مشكله واجهتني بعد طلب اذونات تشفيل GPS وذهاب الى اعدادات الهاتف وتشغيل نظام GPS بطبيعة الحال اعمل رجوع الى الاكتفي من خلال زر الرجوع بعد تشغيل GPS المشكله بعد من ارجع للاكتفتي الاكتفي الاكتفي هنا لا يعمل تحديث الى نفسه بصراحه انا مطور تطبيقات جديد ولا اعلم اذا كان وصفي صحيح هاكذا ولكن الفكرة المطلوبه بعد تشغيل GPS ورجوع الى الاكتفتي  المفترض احصل على قيمة Longitude and latitude ولكن هذا لا يحدث من اجل ان يحدث احتاج الرجوع الى صفحة main activity واعادة الدخول الى هذا الاكتفتي حتى اجد القيمة

الكود الي شغال عليه كالتالي:  

public class SendMapLactiontest extends AppCompatActivity implements OnMapReadyCallback {



    private static final String TAG = SendMapLactiontest.class.getSimpleName();
    private GoogleMap mMap;

    LocationManager locationManager;
    private CameraPosition mCameraPosition;


    private PlacesClient mPlacesClient;


    private FusedLocationProviderClient mFusedLocationProviderClient;

    private final LatLng mDefaultLocation = new LatLng(-33.8523341, 151.2106085);
    private static final int DEFAULT_ZOOM = 15;


    private Location mLastKnownLocation;


    private static final String KEY_CAMERA_POSITION = "camera_position";
    private static final String KEY_LOCATION = "location";


    private static final int M_MAX_ENTRIES = 5;

    EditText textLatitude,textLongitude,lonTextView,lonTextView1;
    Button button,btn;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        if (savedInstanceState != null) {
            mLastKnownLocation = savedInstanceState.getParcelable(KEY_LOCATION);
            mCameraPosition = savedInstanceState.getParcelable(KEY_CAMERA_POSITION);
        }

        setContentView(R.layout.map_send_lcation);
        textLatitude=findViewById(R.id.textLatitude);
        textLongitude=findViewById(R.id.textLongitude);
        lonTextView =findViewById(R.id.tap_text1);
        lonTextView1 =findViewById(R.id.tap_text);

        String apiKey = getString(R.string.google_map_api_key);
        Places.initialize(getApplicationContext(), apiKey);
        mPlacesClient = Places.createClient(this);

        mFusedLocationProviderClient = LocationServices.getFusedLocationProviderClient(this);

        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);mapFragment.getMapAsync(this);



        if(!isLocationEnabled()) {
            AlertDialog.Builder builder = new AlertDialog.Builder(SendMapLactiontest.this);
            builder.setTitle("R.string.network_not_enabled")
                    .setMessage("R.string.open_location_settings")
                    .setPositiveButton("R.string.yes",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    startActivity(new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS));

                                }
                            })
                    .setNegativeButton("R.string.cancel",
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog, int id) {
                                    dialog.cancel();
                                    Intent imgListIntent = new Intent(SendMapLactiontest.this, AddNewItem.class);
                                    startActivity(imgListIntent);
                                    finish();
                                }
                            });
            AlertDialog alert = builder.create();
            alert.show();
        }
    }


    @Override
    protected void onSaveInstanceState(Bundle outState) {
        if (mMap != null) {
            outState.putParcelable(KEY_CAMERA_POSITION, mMap.getCameraPosition());
            outState.putParcelable(KEY_LOCATION, mLastKnownLocation);
            super.onSaveInstanceState(outState);
        }
    }



    @Override
    public void onMapReady(GoogleMap map) {
        mMap = map;
        mMap.clear();


        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {

            if (ActivityCompat.checkSelfPermission
                    (this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
                    &&
                    ActivityCompat.checkSelfPermission
                            (this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED)
            {
                requestPermissions(new String[]{
                        Manifest.permission.ACCESS_COARSE_LOCATION,
                        Manifest.permission.ACCESS_FINE_LOCATION
                }, 1); // 1 is requestCode
                return;

            }
        }else{


        }







        getDeviceLocation();
        mMap.setMyLocationEnabled(true);
        mMap.getUiSettings().setMyLocationButtonEnabled(true);







    }

    protected boolean isLocationEnabled(){
        String le = Context.LOCATION_SERVICE;
        locationManager = (LocationManager) getSystemService(le);
        if(!locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER)){

            return false;
        } else {

            return true;
        }
    }
    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String[] permissions, @NonNull int[] grantResults) {
        switch (requestCode) {

            case 1:
                if (grantResults[0] != PackageManager.PERMISSION_GRANTED){
                    Toast.makeText(SendMapLactiontest.this,"PERMISSION_DENIED",Toast.LENGTH_SHORT).show();
                    Intent imgListIntent = new Intent(SendMapLactiontest.this, AddNewItem.class);
                    startActivity(imgListIntent);
                    finish();
                }
                else {
                    Toast.makeText(SendMapLactiontest.this,"PERMISSION_GRANTED",Toast.LENGTH_SHORT).show();
                    mMap.setMyLocationEnabled(true);
                    mMap.getUiSettings().setMyLocationButtonEnabled(true);
                    getDeviceLocation();

                    // permission granted do something
                }
                break;
        }
    }

    private void getDeviceLocation() {
            try {
                Task<Location> locationResult = mFusedLocationProviderClient.getLastLocation();
                locationResult.addOnCompleteListener(this, new OnCompleteListener<Location>() {

                    @Override
                    public void onComplete(@NonNull Task<Location> task) {
                        if (task.isSuccessful()) {
                            mLastKnownLocation = task.getResult();
                            try {
                                if (mLastKnownLocation==null){
                                    isLocationEnabled();


                                }else {

                            textLatitude.setText("" + mLastKnownLocation.getLatitude());
                            textLongitude.setText("" + mLastKnownLocation.getLongitude());
                                if (mLastKnownLocation != null) {

                                    mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
                                            new LatLng(mLastKnownLocation.getLatitude(),
                                                    mLastKnownLocation.getLongitude()), DEFAULT_ZOOM));

                                }
                                }
                            } catch (Exception e) {
                                e.printStackTrace();
                            }


                        } else {

                            Log.d(TAG, "Current location is null. Using defaults.");
                            Log.e(TAG, "Exception: %s", task.getException());
                            mMap.moveCamera(CameraUpdateFactory
                                    .newLatLngZoom(mDefaultLocation, DEFAULT_ZOOM));
                            mMap.getUiSettings().setMyLocationButtonEnabled(false);


                        }
                    }
                });

            } catch (SecurityException e) {
                Log.e("Exception: %s", e.getMessage());
            }

    }





}

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