Android Uygulama Geliştirme Bir Sorun - Acill Yardım

    String RSS_link="http://blog.blogspot.com.tr/feeds/posts/default";
    private final String RSS_to_Json_API = "https://api.rss2json.com/v1/api.json?rss_url=";

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        toolbar = (Toolbar)findViewById(R.id.toolbar);
        toolbar.setTitle("Blog Uygulaması");
        setSupportActionBar(toolbar);

        BottomNavigationView bottomNavigationView = (BottomNavigationView) findViewById(R.id.bottom_navigation);
        bottomNavigationView.setOnNavigationItemSelectedListener(new BottomNavigationView.OnNavigationItemSelectedListener() {
            @Override
            public boolean onNavigationItemSelected(@NonNull MenuItem item) {
                switch (item.getItemId())
                {
                    case R.id.akillitel:
                        RSS_link.replace(RSS_link, "http://blog.blogspot.com.tr/feeds/posts/default/-/Ak%C4%B1ll%C4%B1%20Telefonlar?alt=rss");
                        loadRSS();
                        break;

                    case R.id.tumyazilar:
                        RSS_link.replace(RSS_link, "http://blog.blogspot.com.tr/feeds/posts/default");
                        loadRSS();
                        break;

                    case R.id.video:
                        RSS_link.replace(RSS_link, "http://blog.blogspot.com.tr/feeds/posts/default/-/Video?alt=rss");
                        loadRSS();
                        break;


                }
                return true;
            }
        });

        recyclerView = (RecyclerView)findViewById(R.id.recyclerView);
        LinearLayoutManager linearLayoutManager  = new LinearLayoutManager(getBaseContext(),LinearLayoutManager.VERTICAL,false);
        recyclerView.setLayoutManager(linearLayoutManager);

        loadRSS();
    }

    private void loadRSS() {
        AsyncTask<String,String,String> loadRSSAsync = new AsyncTask<String, String, String>() {

            ProgressDialog mDialog = new ProgressDialog(Main.this);

            @Override
            protected void onPreExecute() {
                mDialog.setMessage("Lütfen bekleyin...");
                mDialog.show();
            }

            @Override
            protected String doInBackground(String... params) {
                String result;
                HTTPDataHandler http = new HTTPDataHandler();
                result = http.GetHTTPData(params[0]);
                return  result;
            }

            @Override
            protected void onPostExecute(String s) {
                mDialog.dismiss();
                rssObject = new Gson().fromJson(s,RSSObject.class);
                FeedAdapter adapter = new FeedAdapter(rssObject,getBaseContext());
                recyclerView.setAdapter(adapter);
                adapter.notifyDataSetChanged();
            }
        };

        StringBuilder url_get_data = new StringBuilder(RSS_to_Json_API);
        url_get_data.append(RSS_link);
        loadRSSAsync.execute(url_get_data.toString());
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu,menu);
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if(item.getItemId() == R.id.menu_refresh)
            loadRSS();
        return true;
    }
}