Refreshing ListView when using Loadercallbacks

package net.biscani.dino;

import java.util.ArrayList;
import java.util.HashMap;

import android.app.AlertDialog;
import android.app.ListActivity;
import android.app.LoaderManager.LoaderCallbacks;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.Loader;
import android.net.ConnectivityManager;
import android.net.NetworkInfo;
import android.os.Bundle;
import android.support.v4.widget.SwipeRefreshLayout;
import android.support.v4.widget.SwipeRefreshLayout.OnRefreshListener;
import android.text.Html;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.ListAdapter;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends ListActivity {

    private final int MENU_NEWS = 0;
    private final int MENU_QUIT = 1;
    private final int MENU_ABOUT = 2;

    private static int LOADER_NUM = 1;
    private ProgressDialog mPd;
    private ListAdapter mAdapter;
    protected SwipeRefreshLayout mSwipeRefreshLayout;

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

        mSwipeRefreshLayout = (SwipeRefreshLayout)findViewById(R.id.swipeRefreshLayout);
        mSwipeRefreshLayout.setOnRefreshListener(mOnRefreshListener);
        mSwipeRefreshLayout.setColorSchemeColors(android.R.color.holo_blue_bright, android.R.color.holo_green_light, android.R.color.holo_orange_light, android.R.color.holo_red_light);

        if (isNetworkAvailable()) {
            mPd = new ProgressDialog(this);

            ListView lv = getListView();

            lv.setOnItemClickListener(new OnItemClickListener() {

                @Override
                public void onItemClick(AdapterView<?> parent, View view,
                        int position, long id) {
                    String title = ((TextView) view.findViewById(R.id.title))
                            .getText().toString();
                    String content = ((TextView) view
                            .findViewById(R.id.content)).getText().toString();

                    Intent in = new Intent(getApplicationContext(),
                            ArticleActivity.class);
                    in.putExtra(GetArticles.KEY_TITLE, title);
                    in.putExtra(GetArticles.KEY_CONTENT, content);
                    startActivity(in);
                }
            });

            getLoaderManager().restartLoader(LOADER_NUM, Bundle.EMPTY,
                    mLoaderCallbacks);
        } else {
            Toast.makeText(this, "Network is unavailable!", Toast.LENGTH_LONG)
                    .show();
        }

    }

    public boolean isNetworkAvailable() {
        ConnectivityManager manager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = manager.getActiveNetworkInfo();

        boolean isAvailable = false;
        if (networkInfo != null && networkInfo.isConnected()) {
            isAvailable = true;
        }

        return isAvailable;
    }

    private LoaderCallbacks<ArrayList<HashMap<String, String>>> mLoaderCallbacks = new LoaderCallbacks<ArrayList<HashMap<String, String>>>() {

        @Override
        public Loader<ArrayList<HashMap<String, String>>> onCreateLoader(
                int id, Bundle args) {

            mPd.show();

            return new GetArticles(MainActivity.this);
        }

        @Override
        public void onLoadFinished(
                Loader<ArrayList<HashMap<String, String>>> loader,
                ArrayList<HashMap<String, String>> articles) {

            mAdapter = new ArticleAdapter(articles);

            setListAdapter(mAdapter);

            mPd.dismiss();
        }

        @Override
        public void onLoaderReset(
                Loader<ArrayList<HashMap<String, String>>> loader) {
        }
    };

    private class ArticleAdapter extends ArrayAdapter<HashMap<String, String>> {

        private ArticleAdapter(ArrayList<HashMap<String, String>> list) {
            super(MainActivity.this, R.layout.list_item, list);
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {
            View row = convertView;
            if (row == null) {
                LayoutInflater inflater = MainActivity.this.getLayoutInflater();
                row = inflater.inflate(R.layout.list_item, parent, false);
            }
            HashMap<String, String> article = getItem(position);
            ((TextView) row.findViewById(R.id.title)).setText(article
                    .get(GetArticles.KEY_TITLE));
            ((TextView) row.findViewById(R.id.content)).setText(Html
                    .fromHtml(article.get(GetArticles.KEY_CONTENT)));
            return row;
        }

    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        menu.add(0, MENU_NEWS, 0, "Vijesti");
        menu.add(0, MENU_ABOUT, 0, "O aplikaciji");
        menu.add(0, MENU_QUIT, 0, "Izlaz");
        return true;
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {

        case MENU_NEWS:
            Intent i = new Intent(MainActivity.this, MainActivity.class);
            startActivity(i);
            return true;

        case MENU_ABOUT:
            new AlertDialog.Builder(this)
                    .setTitle("Application info")
                    .setMessage("Version: 1.0")
                    .setPositiveButton(android.R.string.yes,
                            new DialogInterface.OnClickListener() {
                                public void onClick(DialogInterface dialog,
                                        int which) {
                                    return;
                                }
                            }).show();
            return true;

        case MENU_QUIT:
            finish();
            return true;

        }
        return false;
    }

    protected OnRefreshListener mOnRefreshListener = new OnRefreshListener() {

        @Override
        public void onRefresh() {
            Toast.makeText(getBaseContext(), "We're refreshing!", Toast.LENGTH_SHORT).show();
        }

    };
}