Destroy activity containing two fragments after clicking Andorid Back Button

Question

Problem SOLVED!

ISSUE: I have problem, and I can't find any solution. I have Maps_Activity, which contains two fragments. Both fragments show google maps v2 and I display them on screen thanks to two ActionBar tabs.

The problem is appearing when I want to return to previous activity. When I click Android back button, my whole application turns down, shows pupup, that my application was stopped.

What I should add to my code to remove this error?

Solution:

Maps_Activity.java

import android.app.ActionBar;
import android.app.Activity;
import android.app.Fragment;

import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.os.Bundle;
import android.util.Log;
import android.widget.Button;



import com.google.android.gms.maps.MapFragment;


public class Maps_Activity extends Activity {

    public static FragmentManager manager;
    Fragment fragmentTab1 = new Medical_Shops_Map();
    Fragment fragmentTab2 = new Medical_Clicnics_Map();
    Button Medical_Shops_Button, Medical_Clinics_Button;
    ActionBar actionBar ;

    @Override
    public void onCreate(Bundle arg0) {
        super.onCreate(arg0);
        setContentView(R.layout.activity_maps_);


        manager = getFragmentManager();

        actionBar=getActionBar();
        actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

        ActionBar.Tab tab1=actionBar.newTab();
        tab1.setText("Apteki 24H/7");
        tab1.setTabListener(new MyTabsListener(fragmentTab1));

        ActionBar.Tab tab2=actionBar.newTab();
        tab2.setText("Przychodnie Lekarskie");
        tab2.setTabListener(new MyTabsListener(fragmentTab2));

        actionBar.addTab(tab1);
        actionBar.addTab(tab2);


    }

    protected class MyTabsListener implements ActionBar.TabListener {

        private Fragment fragment;

        public MyTabsListener(Fragment fragment) {
            this.fragment = fragment;

        }

        public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
        }

        public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
            ft = manager.beginTransaction();
            ft.replace(R.id.map_container, fragment);
            ft.commit();
            Log.e("Activity", "Fragment replace");
        }

        public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
            // some people needed this line as well to make it work:

            MapFragment mMap2 = ((MapFragment) Maps_Activity.manager.findFragmentById(R.id.map));
            ft = manager.beginTransaction();
            if(mMap2!=null)
            {
                ft.remove(mMap2);
                ft.commit();
                Log.e("Activity", "Mapa_fragment destroy");
            }
            else
            {
                MapFragment mMap1 = ((MapFragment) Maps_Activity.manager.findFragmentById(R.id.map1));
                ft.remove(mMap1);
                ft.commit();
                Log.e("Activity", "Mapa_fragment2 destroy");
            }
        }

    }

}

One of the fragments:

   import android.os.Bundle;
import android.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.LinearLayout;
import android.widget.Toast;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.GoogleMapOptions;
import com.google.android.gms.maps.MapFragment;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;


public class Medical_Clicnics_Map extends Fragment implements OnMapReadyCallback {



    private static View view;

    private static GoogleMap mMap2;


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        view =  inflater.inflate(R.layout.medical__clicnics__map, container, false);

        setUpMapIfNeeded();

        return view;
    }


    public void setUpMapIfNeeded() {

            MapFragment mMap2 = ((MapFragment) Maps_Activity.manager
                    .findFragmentById(R.id.map1));
            mMap2.getMapAsync(Medical_Clicnics_Map.this);

    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        Log.d("Activity", "Map ready");
        googleMap.setMyLocationEnabled(true);
        LatLng sydney = new LatLng(-33.867, 151.206);
        googleMap.addMarker(new MarkerOptions()
                .title("Sydney")
                .snippet("The most populous city in Australia.")
                .position(sydney));
    }



}

Maybe for someone this code will be helpful ;)

You may need to read my answer here: http://stackoverflow.com/a/27675976/3922207. — Anggrayudi H, Dec 31 '14 at 03:12
Hi. thanks for engagement. @AlbertNicko with reference to your advice I add to my code `actionBar.setDisplayHomeAsUpEnabled(true);` but this modification nothing change. But what is important? when second fragment contain only TextView ( after modification ), not a map, and when I press Android back button, when app showing this fragment, evrything is ok and I am returning to previous activity, but when my application shows me a MapFragment, after pressing back button app is stopped and crash. Any ideas? — Mateusz Sadowski, Dec 31 '14 at 14:34
@Sone, I add LogCat to post. This is what you mean wraiting stack trace? Im am using Andorid Studio. — Mateusz Sadowski, Dec 31 '14 at 14:34

Destroy activity containing two fragments after clicking Andorid Back Button

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