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Я пытаюсь получить mapFragment, который находится в другом фрагменте, но когда я вызываю findFragmentById, он возвращает только null, я пытаюсь его получить, поэтому я могу удалить его из функции managermanager (в onDestroyView), но он выдает исключение nullpointer, я понятия не имею, как это исправить. Фрагмент, содержащий карту, является частью viewpager.android - getFragmentById возвращает null
Вот мой класс для фрагмента с картой:
import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.content.Context;
import android.database.DataSetObserver;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.net.Uri;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.TextView;
import android.widget.Toast;
import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.MapFragment;
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;
import java.util.ArrayList;
import java.util.List;
import desomer_michael_2app.desomer_michael_eindopdracht_app.Interfaces.ODKortrijkSportLocaties;
import desomer_michael_2app.desomer_michael_eindopdracht_app.Klassen.Sportlocatie;
import desomer_michael_2app.desomer_michael_eindopdracht_app.Util.Connectivity;
import desomer_michael_2app.desomer_michael_eindopdracht_app.Util.WSKortrijkSportlocaties;
/**
* A simple {@link Fragment} subclass.
* Activities that contain this fragment must implement the
* {@link SportStartFragment.OnSportStartFragmentInteractionListener} interface
* to handle interaction events.
*/
public class SportStartFragment extends Fragment implements ODKortrijkSportLocaties, OnMapReadyCallback {
private View view;
private OnSportStartFragmentInteractionListener mListener;
public SportStartFragment() {
// Required empty public constructor
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_sportstart, container, false);
String huidigegebruiker = getActivity().getIntent().getExtras().getString("huidigeGebruiker");
TextView welkomstTekst = (TextView) view.findViewById(R.id.tV_welkomtekst);
welkomstTekst.setText("Welkom, " + huidigegebruiker + "!");
MapFragment map = (MapFragment) getActivity().getFragmentManager().findFragmentById(R.id.map);
//getActivity().getSupportFragmentManager().putFragment(null, "mapFragm", map);
map.getMapAsync(this);
Spinner spinSporten = (Spinner) view.findViewById(R.id.spinSporten);
spinSporten.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
}
@Override
public void onNothingSelected(AdapterView<?> parent) {
}
});
Connectivity connectie = new Connectivity();
if(connectie.isConnected(this.getActivity())){
WSKortrijkSportlocaties webservice = new WSKortrijkSportlocaties();
webservice.execute(this);
} else{
CharSequence toastTekst = "Zorg ervoor dat u verbonden bent met het internet.";
int duration = Toast.LENGTH_SHORT;
Toast toast = Toast.makeText(this.getActivity(),toastTekst, duration);
toast.show();
}
return view;
}
@Override
public void onDestroyView(){
super.onDestroyView();
Fragment fragm = getActivity().getSupportFragmentManager().findFragmentById(R.id.map);
android.support.v4.app.FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager().beginTransaction();
fragmentTransaction.remove(fragm);
fragmentTransaction.commit();
}
@Override
public void onAttach(Activity activity) {
super.onAttach(activity);
try {
mListener = (OnSportStartFragmentInteractionListener) activity;
} catch (ClassCastException e) {
throw new ClassCastException(activity.toString()
+ " must implement OnFragmentInteractionListener");
}
}
@Override
public void onDetach() {
super.onDetach();
mListener = null;
//map.onDestroy();
}
@Override
public void updateKaart(ArrayList<Sportlocatie> sportlocaties) {
}
@Override
public void getSporten(ArrayList<Sportlocatie> sportlocaties) {
Log.i("SportActivity", "Aantal sportlocaties: " + Integer.toString(sportlocaties.size()));
ArrayList<String> sporten = new ArrayList<>();
for(Sportlocatie sl : sportlocaties){
char hoofdletter = Character.toUpperCase(sl.getSport().charAt(0));
String hoofdletterString = hoofdletter + sl.getSport().substring(1);
if(!sporten.contains(hoofdletterString)){
char first = Character.toUpperCase(sl.getSport().charAt(0));
String sportHoofdLetter = first + sl.getSport().substring(1);
sporten.add(sportHoofdLetter);
}
}
ArrayList<String> juisteSporten = new ArrayList();
for(String sport : sporten){
if(!juisteSporten.contains("Petanque") && sport.startsWith("Pet")){
juisteSporten.add("Petanque");
} else{
if(!juisteSporten.contains("Duiveltjesveld") && sport.startsWith("Duiv")){
juisteSporten.add("Duiveltjesveld");
} else{
if(!sport.startsWith("Pet") && !sport.startsWith("Duiv")) juisteSporten.add(sport);
}
}
}
Spinner spinnerSporten = (Spinner) view.findViewById(R.id.spinSporten);
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this.getActivity(), R.layout.support_simple_spinner_dropdown_item, juisteSporten);
spinnerSporten.setAdapter(adapter);
}
@Override
public void onMapReady(final GoogleMap googleMap) {
LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener() {
@Override
public void onLocationChanged(Location location) {
LatLng lokaal;
lokaal = new LatLng(location.getLatitude(), location.getLongitude());
googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(lokaal, 16));
googleMap.addMarker(new MarkerOptions().position(lokaal));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
};
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0,0, locationListener);
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnSportStartFragmentInteractionListener {
// TODO: Update argument type and name
}
}
XML-мой фрагмент, который содержит MapFragment:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
android:paddingBottom="@dimen/activity_vertical_margin"
android:orientation="vertical"
tools:context="desomer_michael_2app.desomer_michael_eindopdracht_app.SportActivity">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="@+id/tV_welkomtekst"
android:textSize="25dp"
android:layout_gravity="center"/>
<TextView
android:text="@string/sportdropdown_tekst"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="25dp"/>
<Spinner
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/spinSporten"></Spinner>
<fragment
android:layout_width="match_parent"
android:layout_height="300sp"
android:id="@+id/map"
android:name="com.google.android.gms.maps.MapFragment"
/>
<Button
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/tekst_startWorkout"/>
</LinearLayout>