Androidマップで現在地を取得するにはどうすればよいですか?

実際、私の問題は、現在地の緯度と経度を取得していないことです.非常に多くの方法を試しました.この質問はすでにSOで尋ねられていることを知っています.

Mapで自分の現在位置を取得し、location変数に設定したい

これは私のコードです:

- onCreate メソッド

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_your_location);
    // Obtain the SupportMapFragment and get notified when the map is ready to be used.
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);

    infoTextView = (TextView) findViewById(R.id.infoTextView);
    requestKorsaButton = (Button) findViewById(R.id.requestKorsa);

    locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
    provider = locationManager.getBestProvider(new Criteria(), true);
    if(provider == null) {
        Toast.makeText(this, "No Location for you", Toast.LENGTH_SHORT).show();
    }

    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this,
                new String[]{android.Manifest.permission.ACCESS_COARSE_LOCATION, android.Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSION_LOCATION_REQUEST_CODE);
    }
    locationManager.requestLocationUpdates(provider, 400, 1, this);
}

- onMapReady メソッド

   @Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;

    if (ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
        ActivityCompat.requestPermissions(
                this,
                new String[]{android.Manifest.permission.ACCESS_COARSE_LOCATION, android.Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSION_LOCATION_REQUEST_CODE);
    }
    mMap.setMyLocationEnabled(true);

    location = locationManager.getLastKnownLocation(provider);
    if (location != null) {
        updateLocation(location);
    }

}