Wsrtjtyk

I am creating an app for finding nearby blood donors. In this app I am using three fragments for swipe navigation. Inn one fragment, the available donor list is shown, but I want to change the list from a menu list by on a clicking particular blood group The 1st list is but when I click the items it shows nothing.

Java code:

public class DonorsFragment extends Fragment {



    SwipeMenuListView listView;

    FirebaseListAdapter adapter;

    TextView fullName,bloodGroup,gender,age,address;

    Query query;

    View rootView;



    FirebaseListOptions<DonorAdapterClass> options;





    public DonorsFragment() {

        // Required empty public constructor

    }



    @Override

    public void onCreate(@Nullable Bundle savedInstanceState) {

        super.onCreate(savedInstanceState);



        setHasOptionsMenu(true);

    }



    @Override

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



         rootView =inflater.inflate(R.layout.fragment_donors, container, false);



        listView = rootView.findViewById(R.id.listview);





Toast.makeText(getActivity(),"oncreateview",Toast.LENGTH_SHORT).show();



         query =FirebaseDatabase.getInstance().getReference().child("Users");



         setQuery(query);







        SwipeMenuCreator creator = new SwipeMenuCreator() {



            @Override

            public void create(SwipeMenu menu) {



                // create "delete" item

                SwipeMenuItem deleteItem = new SwipeMenuItem(getActivity());

                // set item background

                deleteItem.setBackground(new ColorDrawable(Color.rgb(0xF9,

                        0x3F, 0x25)));

                // set item width

                deleteItem.setWidth(170);

                // set a icon

                deleteItem.setIcon(R.drawable.ic_phone);

                // add to menu

                menu.addMenuItem(deleteItem);

            }

        };



        listView.setMenuCreator(creator);



        listView.setOnMenuItemClickListener(new SwipeMenuListView.OnMenuItemClickListener() {

            @Override

            public boolean onMenuItemClick(int position, SwipeMenu menu, int index) {

                switch (index) {

                    case 0:

                        // open



                        Toast.makeText(getActivity(),"Item Clicked",Toast.LENGTH_SHORT).show();

                        break;

                }

                // false : close the menu; true : not close the menu

                return false;

            }

        });



        // Inflate the layout for this fragment

        return rootView;



    }



    @Override

    public void onStart() {

        super.onStart();

        adapter.startListening();

    }



    @Override

    public void onStop() {

        super.onStop();

        adapter.stopListening();

    }



    @Override

    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {

        super.onCreateOptionsMenu(menu, inflater);

        inflater.inflate(R.menu.blood_group_menu,menu);

    }



    @Override

    public boolean onOptionsItemSelected(MenuItem item) {



        switch (item.getItemId()){



            case R.id.a_pos: {

                Toast.makeText(getActivity(),"A+",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_A_Pos").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.a_neg: {

                Toast.makeText(getActivity(),"A-",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_A_Neg").equalTo("yes");

                setQuery(query);

                break;

            }





            case R.id.b_pos: {

                Toast.makeText(getActivity(),"B+",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_B_Pos").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.b_neg: {

                Toast.makeText(getActivity(),"B-",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_B_Neg").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.ab_pos: {

                Toast.makeText(getActivity(),"AB+",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_A_Pos").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.ab_neg: {

                Toast.makeText(getActivity(),"AB-",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users");

                setQuery(query);

                break;

            }



            case R.id.o_pos: {

                Toast.makeText(getActivity(),"O+",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_O_Pos").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.o_neg: {

                Toast.makeText(getActivity(),"O-",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users").orderByChild("canGive_O_Neg").equalTo("yes");

                setQuery(query);

                break;

            }



            case R.id.list_all: {

                Toast.makeText(getActivity(),"All",Toast.LENGTH_SHORT).show();

                query=FirebaseDatabase.getInstance().getReference().child("Users");

                setQuery(query);

                break;

            }



        }

        return super.onOptionsItemSelected(item);

    }





    public void setQuery(Query query){



        listView = rootView.findViewById(R.id.listview);



        options = new FirebaseListOptions.Builder<DonorAdapterClass>()

                .setLayout(R.layout.donor_list)

                .setQuery(query,DonorAdapterClass.class)

                .build();



        adapter = new FirebaseListAdapter(options) {



            @Override

            protected void populateView(@NonNull View v, @NonNull Object model, int position) {

                DonorAdapterClass donors = (DonorAdapterClass) model;



                if(donors.getIsDonor().toString().equals("yes")){



                    fullName = v.findViewById(R.id.fullName_list);

                    bloodGroup = v.findViewById(R.id.bloodGroup_list);

                    gender = v.findViewById(R.id.gender_lis);

                    address = v.findViewById(R.id.address_list);

                    age = v.findViewById(R.id.age_list);







                    fullName.setText(donors.getFullName().toString());

                    bloodGroup.setText(donors.getBloodGroup().toString());

                    gender.setText(donors.getGender().toString());

                    address.setText(donors.getAddress().toString());

                    age.setText(donors.getAge().toString());



                }



            }

        };



        listView.setAdapter(adapter);



    }

}

all firebase query and adapter is set in setQuery() method..when it is called from onCreateView() it is working...but when it is called from switch case in onOptionsItemSelected it shows nothing and previous list view also hides

Thanks in Advance :)

This is my first answer in centuries so please bear with me. This is not an answer but just pointer to the path towards solution.

Put a break-point at the following points

• onOptionsItemSelected


• case R.id.a_pos


• setQuery()


• setQuery::listView inittialization statement


• setQuery::populateView::donor initialization statement

Run the app. Attach the process with debugger. Now when you click "A+" from options, does it get a response from the server or does it throw an exception?