Search in Fragments that hold Recyclerview - android-fragments

Question

I have 3 Fragments and they all are holding a recyclerView. But I don't know how I should call adapter.getFilter().filter(newText); in onQueryTextChange. Any ideas?
MainActivity:
public class MainActivity extends AppCompatActivity {
DatabaseHelper myDB;
private BottomNavigationView bottomNavigationView;
RecyclerView recyclerView;
#Override
protected void onCreate(Bundle savedInstanceState) {
myDB = new DatabaseHelper(this);
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//----Start Bottom Navigation Bar
bottomNavigationView = findViewById(R.id.bottom_navigation);
bottomNavigationView.setOnNavigationItemSelectedListener(bottomNavMethod);
getSupportFragmentManager().beginTransaction().replace(R.id.container, new PasswortFragment()).commit();
String id = getResources().getResourceEntryName(bottomNavigationView.getId());
//----End Bottom Navigation Bar
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return true;
}
private BottomNavigationView.OnNavigationItemSelectedListener bottomNavMethod =
new BottomNavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
Fragment fragment = null;
switch(item.getItemId()){
case R.id.passwoerter:
fragment = new PasswortFragment();
break;
case R.id.bankdaten:
fragment = new BankdatenFragment();
break;
case R.id.kreditkarten:
fragment = new KreditkartenFragment();
break;
}
getSupportFragmentManager().beginTransaction().replace(R.id.container, fragment).commit();
return true;
}
};
#Override
public void onBackPressed() {
super.onBackPressed();
Fragment f = MainActivity.this.getSupportFragmentManager().findFragmentById(R.id.container);
if(f instanceof PasswortFragment)
recyclerView = findViewById(R.id.recyclerViewPasswoerter);
if(f instanceof KreditkartenFragment)
recyclerView = findViewById(R.id.recyclerViewKreditkarten);
if(f instanceof BankdatenFragment)
recyclerView = findViewById(R.id.recyclerViewBankdaten);
}
#Override
public boolean onCreateOptionsMenu(#NonNull Menu menu) {
MenuInflater inflater = getMenuInflater();
inflater.inflate(R.menu.menu, menu);
MenuItem item = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) item.getActionView();
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
#Override
public boolean onQueryTextSubmit(String query) {
return false;
}
#Override
public boolean onQueryTextChange(String newText) {
recyclerView.getAdapter().getFilter().filter(newText); //<--This is not working
return false;
}
});
return true;
}
Adapter:
public class Adapter extends RecyclerView.Adapter<Adapter.MyViewHolder> implements Filterable{
String type;
List<String> dataAll, data1;
Context context;
public Adapter(Context ct, List<String> s1, String typ){
context = ct;
data1 = s1;
type = typ;
dataAll = new ArrayList<>(data1);
}
#NonNull
#Override
public MyViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.reihen, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull MyViewHolder holder, final int position) {
holder.mytext1.setText(data1.get(position));
holder.mainLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(type.equals("Passwoerter")){
Intent intent = new Intent(context, DetailsP.class);
intent.putExtra("data1", data1.get(position));
context.startActivity(intent);
} else if(type.equals("Kreditkarten")){
Intent intent = new Intent(context, DetailsK.class);
intent.putExtra("data1", data1.get(position));
context.startActivity(intent);
} else if(type.equals("Bankdaten")){
Intent intent = new Intent(context, DetailsB.class);
intent.putExtra("data1", data1.get(position));
context.startActivity(intent);
}
}
});
}
#Override
public int getItemCount() {
return data1.size();
}
#Override
public Filter getFilter() {
return filter;
}
private Filter filter = new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
List<String> filteredList = new ArrayList<>();
if(constraint == null || constraint.length() == 0){
filteredList.addAll(dataAll);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for(String item: dataAll){
if(item.toLowerCase().contains(filterPattern)){
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
data1.clear();
data1.addAll( (List) results.values);
notifyDataSetChanged();
}
};
;
public class MyViewHolder extends RecyclerView.ViewHolder{
TextView mytext1;
ConstraintLayout mainLayout;
public MyViewHolder(#NonNull View itemView) {
super(itemView);
mytext1 = itemView.findViewById(R.id.title);
mainLayout = itemView.findViewById(R.id.mainLayout);
}
}
PasswortFragment (the other two fragments are pretty much the same):
public class PasswortFragment extends Fragment {
public PasswortFragment() {
// Required empty public constructor
}
RecyclerView recyclerView;
String tabelle = "Passwort";
List<String> titel;
DatabaseHelper myDB;
Adapter adapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_passwort, container, false);
myDB = new DatabaseHelper(getActivity());
recyclerView = (RecyclerView) view.findViewById(R.id.recyclerViewPasswoerter);
titel = Arrays.asList(myDB.getItems(tabelle));
final LinearLayoutManager layoutManager = new LinearLayoutManager((getActivity()));
layoutManager.setOrientation((LinearLayoutManager.VERTICAL));
recyclerView.setLayoutManager(layoutManager);
adapter = new Adapter(getActivity(), titel, "Passwoerter");
recyclerView.setAdapter(adapter);
setHasOptionsMenu(true);
return view;
}