HomeFragment

package com.example.newsdroid1;


import android.content.Intent;
import android.os.Bundle;

import androidx.annotation.NonNull;
import androidx.core.view.MenuItemCompat;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.text.TextUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SearchView;

import com.example.newsdroid1.Adapters.AdapterPosts;
import com.google.firebase.auth.FirebaseAuth;
import com.google.firebase.auth.FirebaseUser;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;

import java.util.ArrayList;
import java.util.List;

import static androidx.constraintlayout.widget.Constraints.TAG;


/**
 * A simple {@link Fragment} subclass.
 */
public class HomeFragment extends Fragment {

    FirebaseAuth firebaseAuth;

    RecyclerView recyclerView;
    List<ModelPost> postList;
    AdapterPosts adapterPosts;

    public HomeFragment() {
        // Required empty public constructor
    }


    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        View view = inflater.inflate(R.layout.fragment_home, container, false);

        firebaseAuth = FirebaseAuth.getInstance();

        recyclerView = view.findViewById(R.id.postsRecyclerView);
        LinearLayoutManager layoutManager = new LinearLayoutManager(getActivity());

        layoutManager.setStackFromEnd(true);
        layoutManager.setReverseLayout(true);

        recyclerView.setLayoutManager(layoutManager);

        postList = new ArrayList<>();

        loadPosts();

        return view;
    }

    private void loadPosts() {
        DatabaseReference ref = FirebaseDatabase.getInstance().getReference("Posts");

        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                postList.clear();
                for(DataSnapshot ds: dataSnapshot.getChildren()){
                    ModelPost model = ds.getValue(ModelPost.class);

                    postList.add(model);

                    adapterPosts = new AdapterPosts(getActivity(), postList);

                    recyclerView.setAdapter(adapterPosts);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
            }
        });
    }

    private void searchPosts(final String searchQuery){
        DatabaseReference ref = FirebaseDatabase.getInstance().getReference("Posts");

        ref.addValueEventListener(new ValueEventListener() {
            @Override
            public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
                postList.clear();
                for(DataSnapshot ds: dataSnapshot.getChildren()){
                    ModelPost model = ds.getValue(ModelPost.class);

                    if(model.getpTitle().toLowerCase().contains(searchQuery.toLowerCase())){
                        postList.add(model);
                    }



                    adapterPosts = new AdapterPosts(getActivity(), postList);

                    recyclerView.setAdapter(adapterPosts);
                }
            }

            @Override
            public void onCancelled(@NonNull DatabaseError databaseError) {
            }
        });

    }

    private void checkUserStatus(){
        FirebaseUser user = firebaseAuth.getCurrentUser();
        if(user != null){

        }
        else{
            startActivity(new Intent(getActivity(), MainActivity.class));
            getActivity().finish();
        }
    }

    public void onCreate( Bundle savedInstanceState){
        setHasOptionsMenu(true);
        super.onCreate(savedInstanceState);
    }

    public void onCreateOptionsMenu (Menu menu, MenuInflater inflater){
        inflater.inflate(R.menu.menu_main, menu);
        menu.findItem(R.id.action_add_post).setVisible(false);
        menu.findItem(R.id.action_add_search).setVisible(false);
        menu.findItem(R.id.action_logout).setVisible(false);

        MenuItem item = menu.findItem(R.id.action_add_search);
        final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);

        searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
            @Override
            public boolean onQueryTextSubmit(String s) {
                if(!TextUtils.isEmpty(s)){
                    searchPosts(s);

                }
                else{
                    loadPosts();
                }
                return false;
            }

            @Override
            public boolean onQueryTextChange(String s) {
                if(!TextUtils.isEmpty(s)){
                    searchPosts(s);

                }
                else{
                    loadPosts();
                }
                return false;
            }
        });
        super.onCreateOptionsMenu(menu, inflater);
    }

    public boolean onOptionsItemSelected(MenuItem item){
        int id = item.getItemId();
        if( id == R.id.action_logout){
            firebaseAuth.signOut();
            checkUserStatus();
        }
        if( id == R.id.action_add_post){
            startActivity(new Intent(getActivity(),AddPostActivity.class));
        }
        return super.onOptionsItemSelected(item);
    }
}