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POHow to Refresh Fragment from Action Bar Menu
 

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  1. POHow to Refresh Fragment from Action Bar Menu
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    <p>I have an Action Bar with Fragment as follow. I would like to refresh current fragment using Refresh button Action Bar Menu. I saw a lot of example using getFragmentByTag() but my fragment is created dynamically. May I know how to get the current fragment and refresh the content.</p> <p><pre> <code> public class MainActivity extends FragmentActivity implements ActionBar.TabListener {</p> RssFragmentPagerAdapter mRssFragmentPagerAdapter; ViewPager mViewPager; List&lt;RssCategory&gt; categoryList; // Database Helper private DatabaseHelper db; private ActionBar actionBar; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); try{ db = DatabaseHelper.getInstance(getApplicationContext()); int categoryCount = db.getCategoriesCount(); // Create the adapter that will return a fragment for each of the three primary sections // of the app. mRssFragmentPagerAdapter = new RssFragmentPagerAdapter(getSupportFragmentManager(), categoryCount); // Set up the action bar. actionBar = getActionBar(); // Specify that the Home/Up button should not be enabled, since there is no hierarchical // parent. actionBar.setHomeButtonEnabled(false); // Specify that we will be displaying tabs in the action bar. actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); //actionBar.setDisplayOptions(0, ActionBar.DISPLAY_SHOW_TITLE); // Set up the ViewPager, attaching the adapter and setting up a listener for when the // user swipes between sections. mViewPager = (ViewPager) findViewById(R.id.pager); mViewPager.setAdapter(mRssFragmentPagerAdapter); mViewPager.setOffscreenPageLimit(categoryCount - 1); mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener() { @Override public void onPageSelected(int position) { // When swiping between different app sections, select the corresponding tab. // We can also use ActionBar.Tab#select() to do this if we have a reference to the // Tab. actionBar.setSelectedNavigationItem(position); } }); initialiseActionBar(); }catch(Exception e){ Log.e(getClass().getName(), e.getMessage()); } } @Override public boolean onCreateOptionsMenu(Menu menu) { super.onCreateOptionsMenu(menu); MenuInflater inflater = getMenuInflater(); inflater.inflate(R.menu.main, menu); return super.onCreateOptionsMenu(menu); } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: this.finish(); return true; case R.id.action_refresh: //TO REFRESH CURRENT Fragment return true; default: return super.onOptionsItemSelected(item); } } private void initialiseActionBar() { if(categoryList == null) categoryList = db.getAllCategories(); // For each of the sections in the app, add a tab to the action bar. for (RssCategory category : categoryList) { // Create a tab with text corresponding to the page title defined by the adapter. // Also specify this Activity object, which implements the TabListener interface, as the // listener for when this tab is selected. actionBar.addTab( actionBar.newTab() .setText(category.getName()) .setTabListener(this)); } } @Override public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } @Override public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { // When the given tab is selected, switch to the corresponding page in the ViewPager. mViewPager.setCurrentItem(tab.getPosition()); } @Override public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction) { } /** * A {@link FragmentPagerAdapter} that returns a fragment corresponding to one of the primary * sections of the app. */ public static class RssFragmentPagerAdapter extends FragmentPagerAdapter { private int pageCount; public RssFragmentPagerAdapter(FragmentManager fm, int pageCount) { super(fm); this.pageCount = pageCount; } @Override public Fragment getItem(int i) { switch (i) { default: // The other sections of the app are dummy placeholders. Fragment fragment = new RssFragment(); Bundle args = new Bundle(); args.putInt(RssFragment.ARG_CATEGORY_ID, i + 1); fragment.setArguments(args); return fragment; } } @Override public int getCount() { return pageCount; } /*@Override public CharSequence getPageTitle(int position) { return "Section " + (position + 1); }*/ } /** * A dummy fragment representing a section of the app, but that simply displays dummy text. */ public static class RssFragment extends Fragment { public static final String ARG_CATEGORY_ID = "category_id"; View rootView; private List&lt;RssItem&gt; resultList; List&lt;RssWebSite&gt; websiteList; ArrayList&lt;String&gt; urlList; ProgressBar progressBar; @SuppressWarnings("unchecked") @Override public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) { try{ rootView = inflater.inflate(R.layout.fragment_rss_items_list, container, false); resultList = new ArrayList&lt;RssItem&gt;(); progressBar = (ProgressBar)rootView.findViewById(R.id.progressBar); Bundle args = getArguments(); if(args != null){ DatabaseHelper db = DatabaseHelper.getInstance(rootView.getContext()); websiteList = db.getAllRssWebSiteByCategory(args.getInt(ARG_CATEGORY_ID)); urlList = new ArrayList&lt;String&gt;(); if(websiteList != null &amp;&amp; websiteList.size() &gt; 0){ for (RssWebSite website : websiteList) { urlList.add(website.getRssUrl()); } if(urlList.size() &gt; 0) { GetRSSDataTask task = new GetRSSDataTask(); task.execute(urlList); } } } }catch(Exception e){ Log.e(getClass().getName(), e.getMessage()); } return rootView; } /** * This class downloads and parses RSS Channel feed. * * @author clippertech * */ private class GetRSSDataTask extends AsyncTask&lt;ArrayList&lt;String&gt;, Void, List&lt;RssItem&gt; &gt; { @Override protected List&lt;RssItem&gt; doInBackground(ArrayList&lt;String&gt;... urls) { try { for(String url : urls[0]) { // Create RSS reader RssReader rssReader = new RssReader(url); Log.d(getClass().getName(), url); // Parse RSS, get items resultList.addAll(rssReader.getItems()); } return resultList; }catch (Exception e) { Log.e(getClass().getName(), e.getMessage()); } return null; } @Override protected void onPostExecute(List&lt;RssItem&gt; result) { try{ // Get a ListView from the RSS Channel view ListView itcItems = (ListView) rootView.findViewById(R.id.rssChannelListView); View emptyView = null; if(result == null){ itcItems.setEmptyView(emptyView); Log.d(getClass().getName(), "Empty View"); } else { //resultList.addAll(result); Collections.sort(result, new Comparator&lt;RssItem&gt;() { @Override public int compare(RssItem lhs, RssItem rhs) { SimpleDateFormat formatter = new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz"); try { Date date1 = formatter.parse(rhs.getPublishedDate()); Date date2 = formatter.parse(lhs.getPublishedDate()); return date1.compareTo(date2); } catch (ParseException e) { // TODO Auto-generated catch block e.printStackTrace(); } return 0; } }); // Create a list adapter ListAdapter adapter = new ListAdapter(rootView.getContext(), resultList); itcItems.setAdapter(adapter); adapter.notifyDataSetChanged(); // Set list view item click listener itcItems.setOnItemClickListener(new ListListener(resultList, getActivity())); } //dialog.dismiss(); progressBar.setVisibility(View.GONE); }catch(Exception e){ Log.e(getClass().getName(), e.getMessage()); } } } } </code></pre> <p>}</p>
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