Google Map do not show after build to apk and install in real device?

Question

I build an app using Google Map API, when I run my app on virtual device, it worked normally, but when I built my project to apk file and installed it on real device, it had a problem, my app do not show the map. I has already save the debug key and release key in Google Developer Console

I also enter API key in my project

I turned Google Map API enabled

But my app is still not working in real device

Please help me. Thank you. This is my code

public class MapsActivity extends ActionBarActivity implements OnMapReadyCallback {

private GoogleMap mMap;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_maps);
    // 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);
}


/**
 * Manipulates the map once available.
 * This callback is triggered when the map is ready to be used.
 * This is where we can add markers or lines, add listeners or move the camera. In this case,
 * we just add a marker near Sydney, Australia.
 * If Google Play services is not installed on the device, the user will be prompted to install
 * it inside the SupportMapFragment. This method will only be triggered once the user has
 * installed Google Play services and returned to the app.
 */
@Override
public void onMapReady(GoogleMap googleMap) {
    mMap = googleMap;
    // Setting a click event handler for the map
    mMap.setMapType(GoogleMap.MAP_TYPE_HYBRID);
    mMap.setOnMapClickListener(new GoogleMap.OnMapClickListener() {

        @Override
        public void onMapClick(LatLng latLng) {

            // Creating a marker
            MarkerOptions markerOptions = new MarkerOptions();

            // Setting the position for the marker
            markerOptions.position(latLng);

            // Setting the title for the marker.
            // This will be displayed on taping the marker
            markerOptions.title(latLng.latitude + " : " + latLng.longitude);

            // Clears the previously touched position
            //mMap.clear();

            // Animating to the touched position
            mMap.animateCamera(CameraUpdateFactory.newLatLng(latLng));

            // Placing a marker on the touched position
            mMap.addMarker(markerOptions);
        }
    });


    mMap.setOnMarkerClickListener(new GoogleMap.OnMarkerClickListener() {
        @Override
        public boolean onMarkerClick(Marker marker) {
            marker.showInfoWindow();
            return true;
        }
    });
    mMap.setInfoWindowAdapter(new MyInfoWindowAdapter());
    mMap.setOnInfoWindowClickListener(new GoogleMap.OnInfoWindowClickListener() {
        @Override
        public void onInfoWindowClick(Marker marker) {
            Toast.makeText(getApplicationContext(), "Hello", Toast.LENGTH_SHORT).show();
        }
    });
}

@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    //add(groupId, itemId, order, name)
    menu.add(1, 1, 1, "My Location");
    return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    // Handle action bar item clicks here. The action bar will
    // automatically handle clicks on the Home/Up button, so long
    // as you specify a parent activity in AndroidManifest.xml
    switch (item.getItemId()) {

        case 1:
            mMap.setMyLocationEnabled(true);
            return true;

        default:
            break;

    }
    return super.onOptionsItemSelected(item);
}

class MyInfoWindowAdapter implements GoogleMap.InfoWindowAdapter {

    private final View myContentsView;

    MyInfoWindowAdapter(){
        myContentsView = getLayoutInflater().inflate(R.layout.custom_info_contents, null);
    }

    @Override
    public View getInfoContents(Marker marker) {

        TextView tvTitle = ((TextView)myContentsView.findViewById(R.id.title));
        tvTitle.setText(marker.getTitle());
        TextView tvSnippet = ((TextView)myContentsView.findViewById(R.id.snippet));
        tvSnippet.setText(marker.getSnippet());

        return myContentsView;
    }

    @Override
    public View getInfoWindow(Marker marker) {
        // TODO Auto-generated method stub
        return null;
    }

}