Hier habe ich eintoolbar in einem (nActivity welches ein @ enthäSearchView. Und diese Aktivität hat mehrere Fragmente. Ein Hauptfragment von ihnen hat 10 weitere Fragmente in sich. Alle 10 Fragmente zeigen Daten in Listenansichten. Jetzt versuche ich, alle Fragmentlisten nach @ zu filterSearchView vonMainActivity. Aber es filtert niemals die Liste jedes Fragments. Jetzt zeige ich Ihnen, wie ich alles umgesetzt habe.

MainActivity.java

public class MainActivity extends AppCompatActivity {
 @Override
public boolean onCreateOptionsMenu(Menu menu) {
    getMenuInflater().inflate(R.menu.menu_main, menu);
    final SearchView searchView = (SearchView) MenuItemCompat.getActionView(menu.findItem(R.id.action_search));
    SearchManager searchManager = (SearchManager) getSystemService(SEARCH_SERVICE);
    searchView.setSearchableInfo(searchManager.getSearchableInfo(getComponentName()));
    changeSearchViewTextColor(searchView);
    return true;
}
}

Fragment.java

public class CurrencyFragment2 extends android.support.v4.app.Fragment implements SearchView.OnQueryTextListener {

    @Override
public void setMenuVisibility(boolean menuVisible) {
    super.setMenuV,isibility(menuVisible);
    if (menuVisible && getActivity() != null) {
        SharedPreferences pref = getActivity().getPreferences(0);
        int id = pref.getInt("viewpager_id", 0);
        if (id == 2)
            setHasOptionsMenu(true);
 }
 }
    @Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
    inflater.inflate(R.menu.main, menu); // removed to not double the menu items
    MenuItem item = menu.findItem(R.id.action_search);
    SearchView sv = new SearchView(((MainActivity) getActivity()).getSupportActionBar().getThemedContext());
    changeSearchViewTextColor(sv);
    MenuItemCompat.setShowAsAction(item, MenuItemCompat.SHOW_AS_ACTION_COLLAPSE_ACTION_VIEW | MenuItemCompat.SHOW_AS_ACTION_IF_ROOM);
    MenuItemCompat.setActionView(item, sv);
    sv.setOnQueryTextListener(this);
    sv.setIconifiedByDefault(false);
    super.onCreateOptionsMenu(menu, inflater);
}

private void changeSearchViewTextColor(View view) {
    if (view != null) {
        if (view instanceof TextView) {
            ((TextView) view).setTextColor(Color.WHITE);
            ((TextView) view).setHintTextColor(Color.WHITE);
            ((TextView) view).setCursorVisible(true);
            return;
        } else if (view instanceof ViewGroup) {
            ViewGroup viewGroup = (ViewGroup) view;
            for (int i = 0; i < viewGroup.getChildCount(); i++) {
                changeSearchViewTextColor(viewGroup.getChildAt(i));
            }
        }
    }
}

@Override
public boolean onQueryTextSubmit(String query) {
    return true;
}

@Override
public boolean onQueryTextChange(String newText) {
    if (adapter != null) {
        adapter.filter2(newText);
    }
    return true;
}

Filter-Methode innerhalb der Adapterklasse.

// Filter Class
public void filter2(String charText) {
    charText = charText.toLowerCase(Locale.getDefault());
    items.clear();
    if (charText.length() == 0) {
        items.addAll(arraylist);
    } else {
        for (EquityDetails wp : arraylist) {
            if (wp.getExpert_title().toLowerCase(Locale.getDefault()).contains(charText)) {
                items.add(wp);
            }
        }
    }
    notifyDataSetChanged();
}