TestFragment

package antonmatveyenka.testapp;

import android.app.Activity;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapView;
import com.google.android.gms.maps.MapsInitializer;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class TestFragment extends Fragment implements OnMapReadyCallback, View.OnClickListener {


    private MainActivity MA;
    private MapView mMapView;
    private GoogleMap googleMap;
    private Button buttonToSwitch;

    public TestFragment() {};

    public void setMainActivity(MainActivity MA) {
        this.MA = MA;
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        return inflater.inflate(R.layout.fragment_layout, container, false);
    }

    @Override
    public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);
        this.getActivity().setTitle("Мероприятия");

        this.buttonToSwitch = (Button) view.findViewById(R.id.button);
        this.buttonToSwitch.setOnClickListener(this);

        mMapView = (MapView) view.findViewById(R.id.mapView);
        mMapView.onCreate(savedInstanceState);
        mMapView.onResume();
        try {
            MapsInitializer.initialize(getActivity().getApplicationContext());
        } catch (Exception e) {
            e.printStackTrace();
        }
        mMapView.getMapAsync(this);
    }

    @Override
    public void onResume() {
        super.onResume();
        mMapView.onResume();
    }

    @Override
    public void onPause() {
        super.onPause();
        mMapView.onPause();
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        mMapView.onDestroy();
    }

    @Override
    public void onLowMemory() {
        super.onLowMemory();
        mMapView.onLowMemory();
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        this.googleMap = googleMap;
        LatLng Pinsk = new LatLng(52.1313878, 26.1099338);
        this.googleMap.addMarker(new MarkerOptions()
                .position(Pinsk)
                .title("Пинск, стадион ДОСААФ"));
        this.googleMap.moveCamera(CameraUpdateFactory.newLatLng(Pinsk));
    }

    @Override
    public void onClick(View view) {
        this.MA.replaceFragment();
    }
}