Develop Reference

Menu item null when calling method in fragment from activity

My app uses a ViewPager in portrait mode and a dual-fragment layout in landscape.
I am trying to kick off an AsyncTask, that is in the Fragment, from Activity. The AsyncTask is normally started from a menu item in the Actionbar, but I have a need to start it programatically from the Activity.
The menu item is an ImageView and I'm animating it while the AsyncTask is running. The code I have works fine in the dual-fragment landscape view, but I'm getting a NullPointerException on the menu item when in portrait mode.
Activity
public class Main extends SherlockFragmentActivity
{
private static List<Integer> mIds;
private static SparseArray<Fragment> mPageReferenceMap = new SparseArray<Fragment>();
#Override
public void onCreate(final Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
mViewPager = (ViewPager)findViewById(R.id.viewpager); //view pager exists, so we are using the portait layout
if (mViewPager != null)
{
mIds = new ArrayList<Integer>();
mIds.add(0);
mIds.add(1);
mIds.add(2);
}
else //in landscape
{
ListFragment lf = (ListFragment)getSupportFragmentManager().findFragmentById(R.id.fragmentList);
if (lf == null)
lf = new ListFragment();
DetailFragment df = (DetailFragment)getSupportFragmentManager().findFragmentById(R.id.fragmentDetail);
if (df == null)
{
df = new DetailFragment();
df.setArguments(getIntent().getExtras());
}
getSupportFragmentManager().beginTransaction().add(R.id.fragmentList, lf).commit();
getSupportFragmentManager().beginTransaction().add(R.id.fragmentDetail, df).commit();
}
final MyFragmentPagerAdapter fpa = (MyFragmentPagerAdapter)mViewPager.getAdapter();
ListFragment lf2 = (ListFragment)fpa.getFragment(0);
//this works if I use:
//(ListFragment)getSupportFragmentManager().findFragmentById(R.id.fragmentList);
lf2.RunTask();
}
private static class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
if (index == 0)
{
ListFragment lf = ListFragment.newInstance();
mPageReferenceMap.put(index, lf);
return lf;
}
else
{
DetailFragment df = DetailFragment.newInstance(mIds.get(index-1));
mPageReferenceMap.put(index, df);
return df;
}
public Fragment getFragment(int key) {
return mPageReferenceMap.get(key);
}
public void destroyItem(View container, int position, Object object) {
super.destroyItem(container, position, object);
mPageReferenceMap.remove(position);
}
#Override
public int getCount() {
return 4;
}
}
}
Fragment
public class ListingFragment extends SherlockListFragment
{
private MenuItem refreshItem;
public static ListingFragment newInstance() {
ListingFragment lf = new ListingFragment();
return lf;
}
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setHasOptionsMenu(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.listing_layout, container, false);
}
private void StartAnimation() {
final LayoutInflater inflater = (LayoutInflater)getActivity().getSystemService(Context.LAYOUT_INFLATER_SERVICE);
final ImageView ivRefresh = (ImageView)inflater.inflate(R.layout.refresh_view, null);
final Animation rotation = AnimationUtils.loadAnimation(getActivity(), R.anim.refresh);
ivRefresh.startAnimation(rotation);
//this is null
refreshItem.setActionView(ivRefresh);
}
public void StopAnimation()
{
if (refreshItem != null && refreshItem.getActionView() != null)
{
refreshItem.getActionView().clearAnimation();
refreshItem.setActionView(null);
}
}
public void RunTask()
{
new GetItems().execute();
}
private class GetItems extends AsyncTask<Void, Void, Void>
{
#Override
protected void onPreExecute()
{
StartAnimation();
}
#Override
protected Void doInBackground(Void... unused)
{
...
}
protected void onPostExecute(final Void unused)
{
StopAnimation();
}
}
#Override
public void onCreateOptionsMenu(final Menu menu, final MenuInflater inflater) {
inflater.inflate(R.menu.keyword_menu, menu);
refreshItem = menu.findItem(R.id.get);
super.onCreateOptionsMenu(menu, inflater);
}
#Override
public boolean onOptionsItemSelected(final MenuItem item)
{
if (item.getItemId() == R.id.get) {
gi = new GetItems(getActivity(), null);
gi.execute();
return true;
} else {
return super.onOptionsItemSelected(item);
}
}
}

I think following link provide you with your answer on how to avoid the nullpointer exception.
Fragment's instances may be recreated by the system at any time, that's why it's not easy to "hold a reference to them". You have to use the fragmentmanager.
adapter instance gone in fragment with listview

how to access the value of edittext inside fragment which is in a viewpager

I am having am mainActivity which consists of 3 fragment activity in a view pager .each fragment consists of edit texts .How to get the value of the edit text when swipe fragment horizontally ? I am trying to do like this.below code
public class MainActivity extends FragmentActivity {
int value = 0;
Context context;
String a = "";
SectionsPagerAdapter mSectionsPagerAdapter;
ViewPager mViewPager;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
// getWindow().addFlags(WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON);
setContentView(R.layout.activity_main);
// Set up the action bar.
//final ActionBar actionBar = getActionBar();
// actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mAddButtonB = (Button) findViewById(R.id.addnewB);
mAddSearchV = findViewById(R.id.addnewSearch);
mAddButtonB.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
mAddSearchV.setVisibility(View.GONE);
mSectionsPagerAdapter = new SectionsPagerAdapter(
getSupportFragmentManager());
mViewPager = (ViewPager) findViewById(R.id.customviewpager);
mViewPager.setAdapter(mSectionsPagerAdapter);
}
});
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
PageZero p0;
PageOne p1;
PageTwo p2;
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
p0 = new PageZero();
p1 = new PageOne();
p2 = new PageTwo();
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return p0;
case 1:
return p1;
case 2:
return p2;
}
return null;
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
}
// PageZero = (Fragment1)getFragmentManager().findFragmentByTag("frag1");
public class PageZero extends Fragment {
private EditText name;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container,
false);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});/*(new OnKeyListener() {
public boolean onKey(View v, int keyCode, KeyEvent event) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(), a,Toast.LENGTH_SHORT).show();
return false;
}
});*/
return view;
}
}
public class PageOne extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentaddress, container,
false);
return view;
}
}
public class PageTwo extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentmobno, container,
false);
return view;
}
}
}
when i try to access the eddittext inside pageZero class like below
name=(EditText)view.findViewById(R.id.nameTV);
a=name.getText().toString().trim();
i am getting null value.help me out..Thanks in advance.

Change the pagezero class oncreateview code like this .....
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view =getActivity().getLayoutInflater().inflate(R.layout.componentname,null);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
return view;
});
Return the view friend and then use default layout inflater...

At the time you click the edittext field, is there any content? Maybe you should get the text in the lost focus event of the edittext field. Thus you can enter some text first...
Example:
name.setOnFocusChangeListener(new OnFocusChangeListener() {
#Override
public void onFocusChange(View v, boolean hasFocus) {
if(hasFocus == false){
//get text from edittext field...
}
}
});
The way you try to get the text looks right to me. At least I do it the same way.
In the PagerAdapter's 'getItem' Method you should instantiate your fragments directly:
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new PageZero();
case 1:
return new PageOne();
case 2:
return new PageTwo();
}
return null;
}
The Viewpager only calls getItem if it wants to create a new item. Unfortunatly they called the method getItem and not createItem which would be more obvious.

Get your EditText inside onClick block...
This mean change the code from:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container, false);
name=(EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});
return view;
}
To:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container, false);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// GET EDIT TEXT HEAR:
EditText name=(EditText)view.findViewById(R.id.nameTV);
a=name.getText().toString().trim();
Toast.makeText(getApplicationContext(),a,Toast.LENGTH_SHORT).show();
}
});
return view;
}

To create a 3 different fragments with view pager you should:
1)Create FragmentActivity with view pager and view pager adapter.
public class FragmentActivity extends FragmentActivity
{
private FragmentAdapter adapter;
private ViewPager pager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_fragment);
adapter = new FragmentAdapter(getSupportFragmentManager());
pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(adapter);
}
2)Create 3 Fragments with static instance
public final class Fragment1 extends Fragment
{
public static Fragment1 newInstance() {
return new Fragment1();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
LinearLayout layout = new LinearLayout(getActivity());
// your fragment xml view
return view;
}
}
3)Fill view pager adapter with it;
public class FragmentAdapter extends FragmentPagerAdapter
{
public InstallFragmentAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return Fragment1.newInstance();
case 1:
return Fragment2.newInstance();
case 2:
return Fragment3.newInstance();
}
return null;
}
}

public class PageZero extends Fragment {
public static EditText name; //change this to public static
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentname, container,
false);
name = (EditText)view.findViewById(R.id.nameTV);
name.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
}
});
return view;
}
}
Then, you can access the public static EditText name (after the view for it has been generated of course) from another fragment like this.
public class PageOne extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.componentaddress, container,
false);
EditText page_one_text = PageZero.name; //you can get that variable in any fragment now, but using the class name of that fragment to access it
return view;
}
}
Cheers. Please mark this as the correct answer if it helps you. You have quite a bit of answers here

I tried below code. Working for me
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_main_explore, container, false);
ed1 = (EditText)v.findViewById(R.id.editTextTemp);
if( ed1 == null )
{
Toast.makeText(getActivity(), "ERROR UNABLE TO GET EDIT", Toast.LENGTH_LONG).show();
}
// Inflate the layout for this fragment
//return inflater.inflate(R.layout.fragment_main_explore, container, false);
return v;
}

Refreshing a fragment from a DialogFragment

I've been going around in circles trying to do something that seems pretty basic. I have a DialogFragment that accepts a users input, then, on submission, refreshes a ListView in a Fragment that is part of a ViewPager.
I have everything working except the Fragment with the ListView does not refresh itself. It's a little confusing though, because it does refresh the data, but I have to swipe a couple views, then back again to see the updated data.
After doing some research, I'm supposed to use getItemPosition and notifyDataSetChanged on the ViewPager and it should work. The problem is that calling notifyDataSetChanged results in a Recursive entry to executePendingTransactions exception being thrown:
Main Activity
public class Main extends SherlockFragmentActivity implements MyListFragment.OnRefreshAdapterListener, DialogConfirmation.OnRefreshKeywordsListener //Updated Code
{
private static List<Fragment> fragments;
#Override
public void onCreate(final Bundle icicle)
{
setContentView(R.layout.main);
}
#Override
public void onResume()
{
mViewPager = (ViewPager)findViewById(R.id.viewpager);
fragments = new ArrayList<Fragment>();
fragments.add(new MyListFragment()); //fragment with the ListView
fragments.add(MyDetailFragment.newInstance(0));
fragments.add(MyDetailFragment.newInstance(1));
fragments.add(MyDetailFragment.newInstance(2));
mMyFragmentPagerAdapter = new MyFragmentPagerAdapter(getSupportFragmentManager());
mViewPager.setAdapter(mMyFragmentPagerAdapter);
}
private static class MyFragmentPagerAdapter extends FragmentStatePagerAdapter {
public MyFragmentPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int index) {
return fragments.get(index);
}
#Override
public int getCount() {
return 4;
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}
#Override
public void onRefreshAdapterListener() {
this.mMyFragmentPagerAdapter.notifyDataSetChanged();
}
//Updated Code
#Override
public void onRefreshTextListener() {
MyListFragment tf = (MyListFragment)getSupportFragmentManager().findFragmentById(R.id.fragmentText);
if (tf == null)
tf = (MyListFragment)this.fragments.get(0);
tf.RefreshText();
}
}
ListFragment
public class MyListFragment extends SherlockListFragment
{
OnRefreshAdapterListener mRefreshAdapter;
#Override
public void onActivityCreated(Bundle savedState) {
adapter = new CustomAdapter();
/*code to add items to adapter */
this.setListAdapter(adapter);
adapter.notifyDataSetChanged();
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
if (getArguments() != null && getArguments().getString("text").length() > 0)
{
SaveText(getArguments().getString("text"));
this.mRefreshAdapter.onRefreshAdapterListener(); //this line causes a "java.lang.IllegalStateException: Recursive entry to executePendingTransactions" exception
}
return inflater.inflate(R.layout.listing, container, false);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
mRefreshAdapter = (OnRefreshAdapterListener)activity;
}
public interface OnRefreshAdapterListener {
public void onRefreshAdapterListener();
}
#Override
public void onDialogTextAdd(final String text) {
}
}
DialogFragment
public class DialogTextAdd extends DialogFragment implements OnEditorActionListener {
private EditText mText;
OnRefreshTextListener mTextKeywords; //Updated Code
public interface DialogTextAddListener {
void onDialogTextAdd(final String inputText);
}
public DialogTextAdd() {
// Empty constructor required for DialogFragment
}
//Updated Code
#Override
public void onAttach(Activity act) {
super.onAttach(act);
mTextKeywords = (OnRefreshTextListener)act;
}
#Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.dialog_edit, container);
mText = (EditText)view.findViewById(R.id.text_add);
getDialog().setTitle("Add Text");
// Show soft keyboard automatically
mText.requestFocus();
getDialog().getWindow().setSoftInputMode(LayoutParams.SOFT_INPUT_STATE_VISIBLE);
mText.setOnEditorActionListener(this);
return view;
}
#Override
public boolean onEditorAction(final TextView v, final int actionId, final KeyEvent event) {
if (EditorInfo.IME_ACTION_DONE == actionId) {
MyListFragment mf = new MyListFragment();
Bundle args = new Bundle();
args.putString("text", mText.getText().toString());
mf.setArguments(args);
//this seems to be intefering with the notifyDataSetChanged in the listing fragment
getActivity().getSupportFragmentManager().beginTransaction().add(mf, "my_fragment").commit();
mTextKeywords.onRefreshTextListener(); //Updated Code
this.dismiss();
return true;
}
return false;
}
}

I have everything working except the Fragment with the ListView does
not refresh itself.
There is no point on creating and adding to the FragmentActivity a new instance of MyListFragment. From your code it appears that you store the fragments that you use in a list so you have references to them(also, just out of curiosity, did you setup the fragments in portrait, did a rotation of the phone and retried to use the DialogFragment?). Having references to those fragment means you could always get them from the list and use them to call a refresh/update method.

ContextMenu doesn't work when Fragment was added programmatically

I've got a ListFragment which provides a ContextMenu for its elements. When I put this fragment in an xml-layout everything works fine but when I add this ListFragment programmatically via the FragmentManager then this works only until the first screen-rotation. After rotating the screen I can see in the debugger that Android restores the old ListFragment AND creates a new one due to
CustomListFragment fragment = new CustomListFragment();
fragmentTransaction.add(R.id.customFragmentContainer, fragment);
where a new ListFragment gets created. When I long-press an item to open the ContextMenu, then the onCreateContextMenu method of the new ListFragment gets called and the result is passed to the onContextItemSelected method of the old ListFragment.
I think it gets clearer when I post a bit of code:
Here's my ListFragment:
public class CustomListFragment extends ListFragment {
private LayoutInflater layoutInflater;
private OnSelectedListener<String> selectionListener;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
layoutInflater = inflater;
return inflater.inflate(R.layout.list_fragment_layout, null);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setListAdapter(new CustomListAdapter());
registerForContextMenu(getListView());
}
public void setOnSelectedListener(OnSelectedListener<String> listener) {
selectionListener = listener;
}
private static final String item0 = "item0";
private static final String item1 = "item1";
#Override
public void onCreateContextMenu (ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) {
menu.add(0, 0, 0, item0);
menu.add(0, 1, 0, item1);
}
#Override
public boolean onContextItemSelected(MenuItem menuItem) {
String selection;
if (menuItem.getItemId()==0)
selection = item0;
else
selection = item1;
if (selectionListener!=null)
selectionListener.onSelected(selection);
return true;
}
private class CustomListAdapter extends BaseAdapter {
private List<String> elemente = new ArrayList<String>();
public CustomListAdapter() {
elemente.add("one");
elemente.add("two");
elemente.add("three");
}
#Override
public int getCount() {
return elemente.size();
}
#Override
public Object getItem(int position) {
return elemente.get(position);
}
#Override
public long getItemId(int position) {
return 0;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
if (convertView==null)
convertView = layoutInflater.inflate(R.layout.element, null);
TextView tv = (TextView)convertView;
tv.setText(elemente.get(position));
return tv;
}
}
}
With this Activity it works fine:
public class CustomFragmentActivity extends FragmentActivity implements OnSelectedListener<String> {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_layout);
FragmentManager fragmentManager = getSupportFragmentManager();
CustomListFragment fragment = (CustomListFragment)fragmentManager.findFragmentById(R.id.customFragment);
fragment.setOnSelectedListener(this);
}
#Override
public void onSelected(String selection) {
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
}
}
But with this Activity it only works until the first screen-rotation:
public class CustomFragmentContainerActivity extends FragmentActivity implements OnSelectedListener<String> {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_container_layout);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
CustomListFragment fragment = new CustomListFragment();
fragmentTransaction.add(R.id.customFragmentContainer, fragment);
fragmentTransaction.commit();
fragment.setOnSelectedListener(this);
}
#Override
public void onSelected(String selection) {
Toast.makeText(this, selection, Toast.LENGTH_LONG).show();
}
}
The OnSelectedListener is only an inteface which provides one single public method. After a screen-rotation the result (the selected item) is passed to the old ListFragment. But this old ListFragment is recreated by the Android system and the selectionListener is null, so nothing happens. The interface looks like this:
public interface OnSelectedListener<V> {
public void onSelected(V selection);
}
And finally, maybe I should mention that I'm using the v4 support library.

Ok, the problem is, that there's a memory leak in the support library and the onContextItemSelected()-method of the old fragments gets called. And as I return true, the newer fragments don't get this method call.

Update ListFragment after asynctask

I have two listfragment and one fragment in my application. I show you first fragment.
The application starts, Asynctask retrieves data and put them in arrayNews.
I think the problem is the update of listview or adapter in listfragment that does not refresh.
If I change the phone's orientation => listfragment (+ listview) appears correctly.
If I go to fragment 3 (fragment in 2 and 3 in memory), then come back on fragment 1 => it works correctly.
Sorry for my english ^^
public class MainActivity extends FragmentActivity implements ActionBar.TabListener
{
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
public static ArrayList<Data> arrayNews = new ArrayList<Data>();
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
List<Fragment> listeFragments = new Vector<Fragment>();
listeFragments.add(Fragment.instantiate(this, ActualiteFragment.class.getName()));
listeFragments.add(Fragment.instantiate(this, DossierFragment.class.getName()));
listeFragments.add(Fragment.instantiate(this, ForumFragment.class.getName()));
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager(), listeFragments);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
mViewPager = (ViewPager) findViewById(R.id.pager);
mViewPager.setAdapter(mSectionsPagerAdapter);
mViewPager.setOnPageChangeListener(new ViewPager.SimpleOnPageChangeListener()
{
#Override
public void onPageSelected(int position)
{
actionBar.setSelectedNavigationItem(position);
}
});
for (int i = 0; i < mSectionsPagerAdapter.getCount(); i++)
{
actionBar.addTab(actionBar.newTab().setText(mSectionsPagerAdapter.getPageTitle(i)).setTabListener(this));
}
if (arrayDossier.size() == 0 && arrayDossier.size() == 0)
{
chargement_donnees();
}
}
public void chargement_donnees()
{
AsyncTaskChargement chargNews = new AsyncTaskChargement();
chargNews.execute();
}
public class AsyncTaskChargement extends AsyncTask<Void, Integer, Void>
{
private ProgressDialog dialog = new ProgressDialog(MainActivity.this);
#Override
protected void onPreExecute()
{
super.onPreExecute();
dialog.setMessage("Chargement des données ...");
dialog.setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}
#Override
protected Void doInBackground(Void... arg0)
{
arrayNews = ContainerData_news.getFeeds();
return null;
}
#Override
protected void onPostExecute(Void result)
{
if (this.dialog.isShowing())
{
this.dialog.dismiss();
}
}
}
#Override
public boolean onCreateOptionsMenu(Menu menu)
{
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item)
{
switch (item.getItemId())
{
case R.id.menu_refresh:
chargement_donnees();
return true;
default:
return false;
}
}
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
}
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
mViewPager.setCurrentItem(tab.getPosition());
}
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction fragmentTransaction)
{
}
public class SectionsPagerAdapter extends FragmentPagerAdapter
{
List<Fragment> listeFragments;
public SectionsPagerAdapter(FragmentManager fm, List<Fragment> listeFragments)
{
super(fm);
this.listeFragments = listeFragments;
}
#Override
public Fragment getItem(int position)
{
return listeFragments.get(position);
}
#Override
public int getCount()
{
return listeFragments.size();
}
#Override
public CharSequence getPageTitle(int position)
{
switch (position)
{
case 0:
return getString(R.string.title_section1).toUpperCase();
case 1:
return getString(R.string.title_section2).toUpperCase();
case 2:
return getString(R.string.title_section3).toUpperCase();
}
return null;
}
}
public static class ActualiteFragment extends ListFragment
{
public ActualiteFragment()
{
}
#Override
public void onActivityCreated(Bundle savedInstanceState)
{
super.onActivityCreated(savedInstanceState);
setListAdapter(new AdapterListe(getActivity(), arrayNews));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
return inflater.inflate(R.layout.listfragment, container, false);
}
#Override
public void onListItemClick(ListView l, View v, int position, long id)
{
...
}
}
}

I found an easy way to update such list
Steps would be.:
1. declare onCreateView in ListFragment
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.TheLayoutContainingAListView, container, false);
return view;
}
TheLayoutContainingAListView.xml should contain only a listview
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<ListView
android:id="#android:id/list"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
</ListView>
</LinearLayout>
The android:id must be "#android:id/list" . however you may try other things.. I didn't..
2. In onPostExecute of your AsyncTask (Asynctask should be in MainActivity), do everything that you want to do.. i.e. declare an adapter, and setAdapter
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
lv = (ListView) findViewById(android.R.id.list);
CustomAdapter adapt = new CustomAdapter(MainActivity.this,
android.R.id.list, fetch); //You can use ArrayAdapter.. i wanted a custom one
lv.setAdapter(adapt);
showFragment(YOUR Fragment, false);
super.onPostExecute(result);
}
showFragment is just a function i used to show a particular fragment and hide all others.. you can easily achieve it by FragmentTransaction show() and hide() methods.

Use youradapter.notifyDataSetChanged(); in onPostExecute to force a redraw of your list.