Can not reload ListView Content after implementing Filterabl

public class MainActivity extends Activity {

    private ListView mList;
    private List<Movie> currentMovieList = new ArrayList<Movie>();
    private List<Movie> originalMovieList = new ArrayList<Movie>();
    EditText inputSearch;
    private CustomListAdapter adapter;
    private ImageView reload_img;


    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_INDETERMINATE_PROGRESS);
        setContentView(R.layout.activity_main);

        mList = (ListView) findViewById(R.id.list);
        inputSearch = (EditText) findViewById(R.id.inputSearch);
        reload_img = (ImageView) findViewById(R.id.reload_list);


        adapter = new CustomListAdapter(this, currentMovieList);
        mList.setAdapter(adapter);

        //FETCH Movie-Data FROM SERVER TO LIST
        fetchMovie();

        //Reload image click
        reload_img.setOnClickListener(new View.OnClickListener() {
            public void onClick(View arg0) {

                reload_list();
            }
        });

        //SEARCH TEXTCHANGE
        inputSearch.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence cs, int arg1, int arg2, int arg3) {
                // When user changed the Text
                //MainActivity.this.adapter.getFilter().filter(cs.toString());
                String filterString = cs.toString().toLowerCase();
                currentMovieList.clear();
                if (filterString.length == 0) {
                    currentMovieList.addAll(originalMovieList);
                }

                String filterableString;
                for (Movie movie : originalMovieList) {
                    if (movie.getTitle().toLowerCase().contains(filterString)) {
                        currentMovieList.add(movie);
                    }
                }
                adapter.notifyDataSetChanged();
                //FLAGS Cannot resolve method 'getFilter()' here
            }

            @Override
            public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                          int arg3) {
                // TODO Auto-generated method stub

            }

            @Override
            public void afterTextChanged(Editable arg0) {
                // TODO Auto-generated method stub
            }
        });


    }


    //RELOAD LISTVIEW METHOD
    private void reload_list() {

        pDialog = new ProgressDialog(MainActivity.this);
        // Showing progress dialog before making http request
        pDialog.setMessage("Synchronising....");
        pDialog.show();
        pDialog.setCancelable(false);
        pDialog.setCanceledOnTouchOutside(false);


        flag_loading = true;
        offSet = 0;
        inputSearch.setText("");
        movieList.clear();

        fetchMovie();
        //adapter.notifyDataSetChanged();


    }


    //LOAD DATA FROM SERVER TO LISTVIEW USING VOLLEY
    private void fetchMovie() {

        // showing refresh animation before making http call
        //swipeRefreshLayout.setRefreshing(true);

        // appending offset to url
        String url = Config.URL_TOP_250_URL + offSet;
        //String url = Config.MOVIE_JSON_URL;
        //String url = Config.MOVIE_JSON_URL_SHORT;

        // Toast.makeText(MainActivity.this,
        //       "::Json loaded:: ", Toast.LENGTH_SHORT).show();

        JsonArrayRequest movieReq = new JsonArrayRequest(url,
                new Response.Listener<JSONArray>() {
                    @Override
                    public void onResponse(JSONArray response) {
                        // Log.d(TAG, response.toString());
                        hidePDialog();

                        if (response.length() > 0) {

                            //Toast.makeText(MainActivity.this,
                            //     "Json String : \n"+ response.toString(), Toast.LENGTH_LONG).show();

                            // Parsing json
                                   /**/
                            for (int i = 0; i < response.length(); i++) {
                                try {

                                    JSONObject obj = response.getJSONObject(i);

                                    int rank = obj.getInt("rank");

                                    Movie movie = new Movie();

                                    // movie.setRank(obj.getInt("rank"));

                                    movie.setTitle(obj.getString("title"));
                                    movie.setThumbnailUrl(obj.getString("image"));
                                    movie.setRating(((Number) obj.get("rating"))
                                            .doubleValue());

                                    movie.setYear(obj.getInt("releaseYear"));

                                    // Genre is json array
                                    JSONArray genreArry = obj.getJSONArray("genre");
                                    ArrayList<String> genre = new ArrayList<String>();
                                    for (int j = 0; j < genreArry.length(); j++) {
                                        genre.add((String) genreArry.get(j));
                                    }
                                    movie.setGenre(genre);

                                    // adding movie to movies array
                                    originalMovieList.add(movie);

                                    // updating offset value to highest value
                                    if (rank >= offSet)
                                        offSet = rank;
                                    flag_loading = false;
                                } catch (JSONException e) {
                                    e.printStackTrace();

                                    Toast.makeText(MainActivity.this,
                                            "Network connection error \n " + e.getMessage(), Toast.LENGTH_LONG).show();
                                }

                            }
                                    /**/

                            // notifying list adapter about data changes
                            // so that it renders the list view with updated data
                            currentMovieList.clear();
                            currentMovieList.addAll(originalMovieList);
                            adapter.notifyDataSetChanged();
                        } else {
                            Toast.makeText(MainActivity.this,
                                    "End of movie-list", Toast.LENGTH_LONG).show();

                        }


                    }


                }, new Response.ErrorListener() {
            @Override
            public void onErrorResponse(VolleyError error) {
                VolleyLog.d(TAG, "Error :: " + error.getMessage());
                hidePDialog();


            }

        });

        // Adding request to request queue
        MyApplication.getInstance().addToRequestQueue(movieReq);
    }


}