Ich habe eine App, die sich mit Fragmenten und ViewPager befasst. Ich habe drei Fragmente in einem ViewPager. Wenn Sie zwischen ihnen wechseln, rufen die beiden anderen Fragmente immer deren onCreateView-Methoden auf. Wie mache ich das nur einmal, wenn FragmentActivity erstellt wird ??? Ich habe einige Fragen gelesen und die Lösungen ausprobiert, aber die Fragmente haben immer noch das gleiche Verhalten.

ListFragment onCreate wurde zweimal aufgerufen
onCreate () und onCreateView () rufen viel mehr als nötig auf (Fragmente)

Ist hier etwas Code, wenn es Ihnen hilft, Kerle:

Hauptaktivität:

public class StartingActivity extends FragmentActivity implements View.OnClickListener {
ViewPager viewPager;
    CirclePageIndicator pageIndicator;

    Button discount;
    Button qrCode;
    Button pay;
    TabHost tabHost;

    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.starting_layout);
        viewPager = (ViewPager) findViewById(R.id.pager);

        if (savedInstanceState == null) {

            Fragment firstPage = Fragment.instantiate(this, FindTovarFragment.class.getName());
            Fragment secondPage = Fragment.instantiate(this, MainWindowActivity.class.getName());
            Fragment thirdPage = Fragment.instantiate(this, MapActivity.class.getName());

            if ((firstPage != null && !firstPage.isDetached())|| (secondPage != null && !secondPage.isDetached()) || (thirdPage != null && !thirdPage.isDetached())) {

            List<Fragment> viewPagerFragments = new ArrayList<Fragment>();
            viewPagerFragments.add(firstPage);
            viewPagerFragments.add(secondPage);
            viewPagerFragments.add(thirdPage);


            PageAdapter pageAdapter = new PageAdapter(getSupportFragmentManager(), viewPagerFragments);

            viewPager.setAdapter(pageAdapter);

            pageIndicator = (CirclePageIndicator) findViewById(R.id.circle);
            pageIndicator.setViewPager(viewPager);
            pageIndicator.setCurrentItem(pageAdapter.getCount() - 2);
            }
        }

}

MapActivity:

public class MapActivity extends Fragment implements OnMyLocationListener {

    //Тэг для логов
    private static final String TAG = "MapActivity";
    List<Address> addressList;
    private static final String STRING_LOCATION = "";

    ArrayList<TorgCentr> randomTorgCentr;
    ArrayList<String> torgCentrNames;

    Context context;
    AutoCompleteTextView searchTorgCentr;
    OverlayManager overlayManager;
    MapController mapController;
    TextView textView;
    double longitude;
    double latitude;
    double itemLongitude;
    double itemLatitude;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d(TAG, "MapActivity onCreateView");


        View view = (LinearLayout) inflater.inflate(R.layout.map_layout, container, false);
        final MapView mapView = (MapView) view.findViewById(R.id.map);
        textView = (TextView) view.findViewById(R.id.searchlocation);
        searchTorgCentr = (AutoCompleteTextView) view.findViewById(R.id.autoCompleteTextView);

        mapView.showBuiltInScreenButtons(true);
        mapController = mapView.getMapController();
        context = getActivity();
        return view;
    }

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

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        Log.d(TAG, "MapActivity onCreate");

    }

    public void onActivityCreated(Bundle savedInstanceState) {
        Log.d(TAG, "MapActivity onActivityCreated");
        context = getActivity();

        SetRightMapDisplayAddress rightMapDisplayAddress = new SetRightMapDisplayAddress();
        rightMapDisplayAddress.execute(STRING_LOCATION);

        DownloadSuperMarketsArray superMarketsArray = new DownloadSuperMarketsArray();
        superMarketsArray.execute();

        overlayManager = mapController.getOverlayManager();
        overlayManager.getMyLocation().setEnabled(false);

        super.onActivityCreated(savedInstanceState);
    }

Zweites Fragment:

public class MainWindowActivity extends Fragment {

    private static final String TAG = "MainWindowActivity";

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d(TAG, "MainWindowActivity onCreateView");
        View view = (RelativeLayout) inflater.inflate(R.layout.main_window_layout, container, false);
        if (container == null) {
            return null;
        }
        return view;
    }
}

Und der dritte:

public class FindTovarFragment extends Fragment {

    private static final String TAG= "FindTovarFragment";

    Context context;
    ArrayList<Category> categories;
    Spinner categoryContainer;

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        Log.d(TAG, "FindTovarFragment onCreateView");

        View view = (LinearLayout) inflater.inflate(R.layout.find_tovar_main_layout, container, false);
        categoryContainer = (Spinner) view.findViewById(R.id.category);

        return view;
    }

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        Log.d(TAG, "FindTovarFragment onActivityCreated");
        DownloadCategory downloadCategory = new DownloadCategory();
        downloadCategory.execute();
    }

Protokolle für MapActivity:

06-20 11:06:37.709: DEBUG/MapActivity(1290): MapActivity onCreate
06-20 11:06:37.709: DEBUG/MapActivity(1290): MapActivity onCreateView
06-20 11:06:38.509: DEBUG/MapActivity(1290): MapActivity onActivityCreated

Dann immer wieder:

06-20 11:07:53.239: DEBUG/MapActivity(1290): MapActivity onCreate
06-20 11:07:53.239: DEBUG/MapActivity(1290): MapActivity onCreateView
06-20 11:07:53.429: DEBUG/MapActivity(1290): MapActivity onActivityCreated
06-20 11:08:23.029: DEBUG/MapActivity(1290): MapActivity onCreate
06-20 11:08:23.039: DEBUG/MapActivity(1290): MapActivity onCreateView
06-20 11:08:23.269: DEBUG/MapActivity(1290): MapActivity onActivityCreated

Vielen Dank im Voraus.