How to highlight filtered text in RecyclerView when using SearchView widget

Question

How to highlight search text result in RecyclerView. I found some posts regarding Spannable TextView, but not sure where to implement in my case. Appreciate you can look and assist.

MainActivity or Chapter1

 public class Chapter1 extends AppCompatActivity implements SearchView.OnQueryTextListener {
        MyRecAdapter myRecAdapter;
        RecyclerView recyclerView;
        List<Post> list;        
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(layout.chapter1_main);
            recyclerView = (RecyclerView) findViewById(R.id.myrec);
            createdata();
            myRecAdapter = new MyRecAdapter(list, Chapter1.this);
            recyclerView.setLayoutManager(new LinearLayoutManager(Chapter1.this));
            recyclerView.setAdapter(myRecAdapter);
        }        
        void createdata() {             
            list = new ArrayList<>();               
            String topic_1_1 = getResources().getString(string.topic_1_1);
            String text_1_1 = getString(string.text_1_1);
            String topic_1_2 = getResources().getString(string.topic_1_2);
            String topic_1_3 = getResources().getString(string.topic_1_3);
            String text_1_3 = getString(string.text_1_3);         
            list.add(new Post(topic_1_1, text_1_1));
            list.add(new Post(topic_1_2, ""));
            list.add(new Post(topic_1_3, text_1_3));               

        }       

        @Override
        public boolean onCreateOptionsMenu(Menu menu) {
            getMenuInflater().inflate(R.menu.menu_search, menu);
            getMenuInflater().inflate(R.menu.main, menu);        
            MenuItem item = menu.findItem(R.id.menu_search);
            SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);        
            searchView.setOnQueryTextListener(this);        
            return super.onCreateOptionsMenu(menu);
        }     


        @Override
        public boolean onQueryTextChange(String newText) {        

            final List<Post> filteredModelList = filter(list, newText);        
            if (filteredModelList.size() > 0) {        
                myRecAdapter.setFilter(filteredModelList);
                return true;
            } else {
                Toast.makeText(Chapter1.this, "Not Found", Toast.LENGTH_SHORT).show();
                return false;
            }
        }        
        private List<Post> filter(List<Post> models, String query ) {
            query = query.toLowerCase();        
            final List<Post> filteredModelList = new ArrayList<>();
            for (Post model : models) {        
                final String text = model.getPostTitle().toLowerCase();
                final String text_sub = model.getPostSubTitle().toLowerCase();        
                if (text.contains(query)) {
                    filteredModelList.add(model);

                }
                else {
                    if (text_sub.contains(query)) {
                        filteredModelList.add(model);
                    }        
                }     
            }
            createdata();
            myRecAdapter = new MyRecAdapter(filteredModelList, Chapter1.this);
            recyclerView.setLayoutManager(new LinearLayoutManager(Chapter1.this));
            recyclerView.setAdapter(myRecAdapter);
            myRecAdapter.notifyDataSetChanged();
            return filteredModelList;
        }
    }

Adapter

public class MyRecAdapter extends RecyclerView.Adapter<MyRecAdapter.VH> {
        public List<Post> parkingList;        
        public Context context;
        ArrayList<Post> mCountryModel;        
        public MyRecAdapter(List<Post> parkingList, Context context) {
            this.parkingList = parkingList;
            this.context = context;
        }        
        @Override
        public MyRecAdapter.VH onCreateViewHolder(ViewGroup parent, int viewType) {
            return new MyRecAdapter.VH(LayoutInflater.from(parent.getContext()).inflate(R.layout.mycardview, parent, false));
        }        
        @Override
        public void onBindViewHolder(MyRecAdapter.VH holder, int position) {       
                holder.t1.setText(Html.fromHtml(parkingList.get(position).getPostTitle()));                    holder.t2.setText(Html.fromHtml(parkingList.get(position).getPostSubTitle()));        
        }        
        @Override
        public int getItemCount() {
            return parkingList.size();
        }        
        public class VH extends RecyclerView.ViewHolder {
            TextView t1, t2;        
            public VH(View view) {
                super(view);        
                t1 = (TextView) view.findViewById(R.id.list_title);
                t2 = (TextView) view.findViewById(R.id.list_desc);        
            }        
        }          
        public void setFilter(List<Post> countryModels) {
            mCountryModel = new ArrayList<>();
            mCountryModel.addAll(countryModels);        
            notifyDataSetChanged();        
        }

    }

Answer 1

As per accepted answer indexOf() is not working in case of string value is "Mumbai" same occurrences inside string. So here I have used "Pattern" and "Matcher" class to make it work. Also, I have added ".toLowerCase()" to make string with same case and query work on string as ignore case. If you no need of ignore case of query string, You can remove .toLowerCase() from this code snippet

  SpannableStringBuilder sb = new SpannableStringBuilder(desc);
        Pattern word = Pattern.compile(query.toLowerCase());
        Matcher match = word.matcher(desc.toLowerCase());

        while (match.find()) {
            ForegroundColorSpan fcs = new ForegroundColorSpan(
                    ContextCompat.getColor(context, R.color.colorPrimary)); //specify color here
                sb.setSpan(fcs, match.start(), match.end(), Spannable.SPAN_INCLUSIVE_INCLUSIVE);
        }
        viewHolders.text_view_title.setText(sb);