Develop Reference

Can't change the tabItem ( program crashes ), when I delete one of my tabItems with code

I have an application in which I create TabItems dynamically and I add them to the TabLayout. I'll show you the code below. then I also have a mechanism that when a tabitem is created, the user can close it with a click of a button. NOW: the problem happens here. when the user deletes that tabitem and program automatically directs the user to another tab. I can no longer click on the other tabs that I created at the start of the application. I Can click on them, but the program closes with the error
java.lang.IllegalStateException: The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 4, found: 3 Pager
and all of this happens when I delete a tabitem with a code written for a click. below is my MainActivity.java code :
public class MainActivity extends AppCompatActivity implements ContactsFragment.CallBacks, UserDetailFragment.DetailCallBacks {
android.support.v7.widget.Toolbar toolbar;
public static List<Fragment> fragments = new ArrayList<>();
public static List<String> fragmentsTitle = new ArrayList<>();
ViewPager viewPager;
TabLayout tabLayout;
int tabposition_number;
public List<Fragment> getFragments() {
return fragments;
}
public List<String> getFragmentsTitle() {
return fragmentsTitle;
}
public void addToFragments(Fragment fragment) {
fragments.add(fragment);
}
public void addToFragmentsTitle(String title) {
fragmentsTitle.add(title);
}
public Fragment getFragmentsWithPosition(int position) {
return fragments.get(position);
}
public String getFragmentsTitleWithPosition(int position) {
return fragmentsTitle.get(position);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
MenuInflater menuInflater = new MenuInflater(this);
menuInflater.inflate(R.menu.top_main_menu,menu);
return super.onCreateOptionsMenu(menu);
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
if(item.getItemId() == R.id.remove_tab) {
remove_tab_details(3);
}
return super.onOptionsItemSelected(item);
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_page_drawer);
this.tabLayout = findViewById(R.id.tab_layout);
this.viewPager = findViewById(R.id.view_pager);
tabLayout.setupWithViewPager(viewPager);
SetUpViewPager(viewPager);
this.toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
NavigationView navigationView = findViewById(R.id.navigation_view);
navigationView.setItemIconTintList(null);
tabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener(){
#Override
public void onTabSelected(TabLayout.Tab tab) {
if(tab.getPosition() > 2) {
tabposition_number = tab.getPosition();
}
// viewPager.setCurrentItem(tab.getPosition());
if(tab.getPosition() == 1) {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_contacts));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_contacts));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_contacts));
}
} else if(tab.getPosition() == 2) {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_register));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_register));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_register));
}
} else {
toolbar.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.tab_signin));
tabLayout.setBackgroundColor(ContextCompat.getColor(MainActivity.this,R.color.main_signin));
if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(ContextCompat.getColor(MainActivity.this,R.color.status_signin));
}
}
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
}
public void SetUpViewPager(ViewPager viewPager) {
MyViewPagerAdapter Adapter = new MyViewPagerAdapter((getSupportFragmentManager()));
Adapter.AddFragmentPage(new SignInFragment(),"ورود");
Adapter.AddFragmentPage(new ContactsFragment(),"ارتباطات");
Adapter.AddFragmentPage(new RegisterFragment(),"ثبت نام");
Adapter.notifyDataSetChanged();
viewPager.setAdapter(Adapter);
}
#Override
public void create_user_detail_tab(UserObject userObject) {
MyViewPagerAdapter Adapter = new MyViewPagerAdapter(getSupportFragmentManager());
UserDetailFragment userDetailFragment = new UserDetailFragment();
Bundle bundle = new Bundle();
bundle.putString("name",userObject.getName());
bundle.putString("family",userObject.getFamily());
bundle.putString("email",userObject.getEmail());
userDetailFragment.setArguments(bundle);
Adapter.AddFragmentPage(userDetailFragment,userObject.getName());
viewPager.setAdapter(Adapter);
TabLayout.Tab tab = tabLayout.getTabAt(1);
tab.select();
}
#Override
public void delete_previous_tab(int tabposition_number) {
remove_tab_details(tabposition_number);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
}
#Override
public void changeTabItem(boolean mustdelete) {
ContactsFragment contactsFragment = new ContactsFragment();
if(tabposition_number > 2 && mustdelete) {
contactsFragment.setTextView(tabposition_number,mustdelete);
TabLayout.Tab tab = tabLayout.getTabAt(1);
tab.select();
}
}
public class MyViewPagerAdapter extends FragmentPagerAdapter {
public MyViewPagerAdapter(FragmentManager manager) {
super(manager);
}
public void removeTabPage(int position) {
fragments.remove(position);
fragmentsTitle.remove(position);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
myViewPagerAdapter.notifyDataSetChanged();
}
public void AddFragmentPage(Fragment frag,String title) {
MainActivity.this.addToFragments(frag);
MainActivity.this.addToFragmentsTitle(title);
MyViewPagerAdapter myViewPagerAdapter = new MyViewPagerAdapter(getSupportFragmentManager());
myViewPagerAdapter.notifyDataSetChanged();
}
public Fragment getItem(int position) {
return MainActivity.this.getFragmentsWithPosition(position);
}
public CharSequence getPageTitle(int position) {
return MainActivity.this.getFragmentsTitleWithPosition(position);
}
public int getCount() {
return fragments.size();
}
}
public void remove_tab_details(int tab_to_delete) {
// TabLayout.Tab tab = tabLayout.getTabAt(2);
// tab.select();
tabLayout.removeTabAt(tab_to_delete);
MyViewPagerAdapter Adapter = new MyViewPagerAdapter(getSupportFragmentManager());
Adapter.removeTabPage(tab_to_delete);
Adapter.notifyDataSetChanged();
}
}
and the code for UserDetailFragment ( which creates when the user click on one of the items in a listview fragment .
public class UserDetailFragment extends Fragment {
View view;
DetailCallBacks detailCallBacks;
public UserDetailFragment() {}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.user_detail_fragment,null);
return view;
}
#Override
public void onResume() {
super.onResume();
final Bundle bundle = getArguments();
String name = (String) bundle.get("name");
String family = (String)bundle.get("family");
String email = (String)bundle.get("email");
TextView nameFamilytv = view.findViewById(R.id.user_detail_name_and_family);
String nameAndfamily = name + " " + family;
nameFamilytv.setText(nameAndfamily);
TextView emailtv = view.findViewById(R.id.user_detail_email);
emailtv.setText(email);
Button closebtn = view.findViewById(R.id.detail_close_button);
closebtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
detailCallBacks.changeTabItem(true);
}
});
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
detailCallBacks = (DetailCallBacks)context;
}
public interface DetailCallBacks {
public void changeTabItem(boolean mustdelete);
}
and last but not least : the code for that list item that creates dynamic tabs when user clicks on its items :
public class ContactsFragment extends ListFragment {
CallBacks callBacks;
View view;
public static int came_fromTabItem;
public static boolean do_delete;
public ContactsFragment() { }
ArrayList<UserObject> userObjects;
BroadcastReceiver broadcastReceiver = new BroadcastReceiver() {
#Override
public void onReceive(Context context, Intent intent) {
userObjects = intent.getParcelableArrayListExtra(Intent_Service.SERVICE_PAYLOAD);
ArrayAdapter<UserObject> userObjectArrayAdapter = new UserArrayAdapter(context,0,userObjects);
setListAdapter(userObjectArrayAdapter);
}
};
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Intent intent = new Intent(getActivity(), Intent_Service.class);
getActivity().startService(intent);
LocalBroadcastManager.getInstance(getActivity().getApplicationContext()).
registerReceiver(broadcastReceiver,new IntentFilter(Intent_Service.SERVICE_MESSAGE));
}
public void setTextView(int position,Boolean mustDelete) {
came_fromTabItem = position;
do_delete = mustDelete;
}
#Override
public void onResume() {
super.onResume();
if(came_fromTabItem > 2 && do_delete) {
final Handler handler = new Handler();
handler.postDelayed(new Runnable() {
#Override
public void run() {
callBacks.delete_previous_tab(came_fromTabItem);
do_delete = false;
Toast.makeText(getActivity().getApplicationContext(),String.valueOf(came_fromTabItem),Toast.LENGTH_LONG).show();
}
}, 2000);
}
}
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
this.view = inflater.inflate(R.layout.fragment_contacts,null);
return this.view;
}
public void onListItemClick(ListView l, View v, int position, long id) {
UserObject userObject = userObjects.get(position);
callBacks.create_user_detail_tab(userObject);
}
public interface CallBacks {
public void create_user_detail_tab(UserObject userObject);
public void delete_previous_tab(int positions);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
this.callBacks = (CallBacks)context;
}
}
So... can anyone help me please? the problem is simple, why the error The application's PagerAdapter changed the adapter's contents without calling PagerAdapter#notifyDataSetChanged! Expected adapter item count: 4, found: 3 appears when a tabitem is removed, how can I solve it?

the problem occur because you delete a tab item and your pager still has 4 in item count , you have to make pager item count dynamic , and call notifyDataSetChanged() after you remove an item
here is an example
public class MyPagerAdapter extends FragmentPagerAdapter {
int nbrItem;
public ProfilPagerAdapter(FragmentManager fm,String token,Int nbrItem) {
super(fm);
this.nbrItem= nbrItem;
}
#Override
public Fragment getItem(int position) {
switch(position) {
case 0 :
new SignInFragment();
case 1 :
new ContactsFragment()
case 2 :
new RegisterFragment()
}
return null;
}
#Override
public int getCount() {
return nbrItem;
}
public void setNbrItem(int nbrItem) {
this.nbrItem= nbrItem;
}
now when you remove an item you will pass to new number of item to your adapater
getAdapter().setNbrItem(2);
getAdapter().notifyDataSetChanged();

I solved my Problem, But with a hack, you see the error was because: TabItems are counting and indexing from 0, but as my pages are dynamically creating, I set the
getCount() method of my FragmentPagerAdapter to return the ArrayList<Fragment> fragments size , with fragments.size() , on the other hand, the size of an ArrayList doesn't count 0. so for 3 elements, instead of 0 1 2, or number 2, it returns to number 3.
so back to business, I was compelled to add null to my ArrayList and one null to my ArrayList titles, so this way when I removed my last TabItem, program doesn't crash anymore, and to be more convenient, when a user closes all Tabs , everytime user opens ( adds ) a new tab, I call fragments.removeAll(Collections.singleton(null)); to clear every null element i have inserted, for the TabTitles Too .
anyway cheers you guys, I'm sure this would be a good tutorial for those who want to create such applications because I've included all of my codes. please give a thumbs up. thanks.

ViewPager : Navigating Back to Parent Fragment From Child Fragment Closes The Application

I am implementing nested fragments in a ViewPager. When I perform the transaction by replacing the child fragment in the parent fragment after executing addToBackStack(), I am able to see the view shown below. But when I press back button and the code reaches the MainActivity's onBackPressed() method, I notice the stack size is 1, and I successfully popout the Fragment. The problem starts now
My app closes and for a brief amount of time, I see my child fragment closing and then the app closing.
MainActivity
public class MainActivity extends FragmentActivity implements FragmentCommunicationListener {
ViewPager viewPager;
PagerAdapter pagerAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
//createTabs();
viewPager = (ViewPager) findViewById(R.id.pager);
Fragment[] fragments = new Fragment[]{
new ViewStudentsFragment(),
new AddStudentFragment()
};
pagerAdapter = new PagerAdapter(getSupportFragmentManager(), this, fragments);
viewPager.setAdapter(pagerAdapter);
}
#Override
public void passMsg(Fragment fragment, Bundle msg) {
int currentItem = viewPager.getCurrentItem();
Fragment targetFragment;
if (currentItem == 0) {
targetFragment = getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + 1);
((AddStudentFragment) targetFragment).renderData(msg);
viewPager.setCurrentItem(1);
} else {
targetFragment = getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + 0);
((ViewStudentsFragment) targetFragment).updateList(msg,viewPager);
viewPager.setCurrentItem(0);
}
}
#Override
public void onBackPressed() {
ViewStudentsFragment fragment = (ViewStudentsFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + 0);
super.onBackPressed();
if (fragment.getChildFragmentManager().getBackStackEntryCount() != 0) {
fragment.getChildFragmentManager().popBackStack();
}
}
}
Parent Fragment
public class ViewStudentsFragment extends Fragment {
ArrayList<Student> studentList = new ArrayList<Student>();
ListView list;
ListViewAdapter listAdapter;
GridView grid;
FragmentCommunicationListener fragComm = null;
int resIdView, resIdSort;
GridViewAdapter gridAdapter;
static ImageButton toggleView, toggleSort;
View view;
ViewPager viewPager=null;
public ViewStudentsFragment() {
}
private static ViewStudentsFragment viewStudentsFragment;
FragmentTransaction transaction;
Fragment details ;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_view_students, container, false);
toggleView = (ImageButton) view.findViewById(R.id.viewImageButton);
toggleSort = (ImageButton) view.findViewById(R.id.sortImageButton);
transaction= getChildFragmentManager().beginTransaction();
view.findViewById(R.id.container).setVisibility(View.GONE);
...
toggleView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
...
}
});
toggleSort.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
...
}
});
registerForContextMenu(list);
registerForContextMenu(grid);
return view;
}
public void updateList(Bundle bundle,ViewPager vp) {
viewPager=vp;
...
}
listAdapter.notifyDataSetChanged();
gridAdapter.notifyDataSetChanged();
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
if (activity instanceof FragmentCommunicationListener) {
fragComm = (FragmentCommunicationListener) activity;
} else {
throw new ClassCastException();
}
}
#Override
public void onCreateContextMenu(ContextMenu menu, View view, ContextMenu.ContextMenuInfo menuInfo) {
...
}
#Override
public boolean onContextItemSelected(MenuItem item) {
...
switch (menuItemIndex) {
case Constant.VIEW_STUDENT_DETAIL:
bundle.putSerializable("viewField", student); view.findViewById(R.id.container).setVisibility(View.VISIBLE);
transaction.addToBackStack(null);
details = new Details();
transaction.replace(R.id.container, details, "task");
transaction.commit();
details.setArguments(bundle);
break;
...
default:
}
listAdapter.setStudentList(studentList);
gridAdapter.setStudentList(studentList);
listAdapter.notifyDataSetChanged();
gridAdapter.notifyDataSetChanged();
return true;
}
}
ChildFragment
public class Details extends Fragment {
View view;
static Details details;
Context context;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
context=container.getContext();
Bundle bundle = getArguments();
view=inflater.inflate(R.layout.display_details, container, false);
...
return view;
}
#Override
public void onDetach() {
super.onDetach();
view.findViewById(R.id.displayDetails).setVisibility(View.GONE);
}
#Override
public void onDestroyView() {
super.onDestroyView();
view.findViewById(R.id.displayDetails).setVisibility(View.GONE);
}
#Override
public void setArguments(Bundle bundle) {
super.setArguments(bundle);
}
}
PagerAdapter
public class PagerAdapter extends FragmentPagerAdapter {
private String[] tabMenu;
private int pageCount;
private Context context;
private Fragment[] fragments;
public PagerAdapter(FragmentManager fm, Context context, Fragment[] fragments) {
super(fm);
this.context = context;
tabMenu = context.getResources().getStringArray(R.array.tab_menu);
pageCount = tabMenu.length;
this.fragments = fragments;
}
#Override
public Fragment getItem(int position) {
return fragments[position];
}
#Override
public int getCount() {
return fragments.length;
}
#Override
public CharSequence getPageTitle(int position) {
return tabMenu[position];
}
}

If you use FragmentTransaction.addToBackStack(), the back button is handled automatically for you.
When you do this:
#Override
public void onBackPressed() {
ViewStudentsFragment fragment = (ViewStudentsFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + 0);
super.onBackPressed();
if (fragment.getChildFragmentManager().getBackStackEntryCount() != 0) {
fragment.getChildFragmentManager().popBackStack();
}
}
you are basically popping the backstack twice, which is why your application quit.
Replace the onBackPressed() method in your Activity with this:
#Override
public void onBackPressed() {
ViewStudentsFragment fragment = (ViewStudentsFragment) getSupportFragmentManager().findFragmentByTag("android:switcher:" + R.id.pager + ":" + 0);
if (fragment.getChildFragmentManager().getBackStackEntryCount() != 0) {
fragment.getChildFragmentManager().popBackStack();
}
else {
super.onBackPressed();
}
}

Get fragment activity outside of Fragment.OnCreateView()

I have a Fragment with a TableLayout. The data in the table is from a SQLite db. The SQLite db is populated from a RESTful webservice in an AsyncTask in the MainActivity. The Fragment must wait for the task to complete before populating the table. The Fragment listens for the task onPostExecute() method to be called. When it is, the method onLoadAndStoreComplete in the Fragment is called. This all works.
What doesn't work is that I need the fragment activity in order to create new TableRows and TextViews in onLoadAndStoreComplete and I can't get it.
I've tried:
- making a class member fragmentActivity and assigning in onCreateView(), but by the time it gets to onLoadAndStoreComplete(), it is null.
- calling this.getActivity() again in onLoadAndStoreComplete(), but it returns null.
How do I get the fragment activity?
MyFragment.java:
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
fragmentActivity = this.getActivity(); // return value is valid
...
}
#Override
public void onLoadAndStoreComplete() {
fragmentActivity = this.getActivity(); // returns null
...
}
from MainActivity.java (extends ActionBarActivity)
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mainActivity = this;
setContentView(R.layout.activity_main);
Resources resources = getResources();
String[] tabTitleArray = { resources.getString(R.string.first_fragment),
resources.getString(R.string.second_fragment),
resources.getString(R.string.help_fragment) };
viewPager = (ViewPager) findViewById(R.id.pager);
actionBar = getSupportActionBar();
mAdapter = new TabsPagerAdapter(this.getSupportFragmentManager());
viewPager.setAdapter(mAdapter);
actionBar.setHomeButtonEnabled(false);
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (String tab_name : tabTitleArray) {
actionBar.addTab(actionBar.newTab().setText(tab_name).setTabListener(this));
}
// On swiping the ViewPager, select the respective tab
viewPager.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
actionBar.setSelectedNavigationItem(position) ;// on changing the page, make respected tab selected
}
#Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
}
#Override
public void onPageScrollStateChanged(int arg0) {
}
});
String url = "http://myrestfulwebservice";
Fragment secondFragment = mAdapter.getItem(SECOND_TAB);
new LoadAndStoreDataTask((OnLoadAndStoreCompleteListener)secondFragment).execute(url);
}
} // end OnCreate
TabsPagerAdapter.java
public class TabsPagerAdapter extends FragmentPagerAdapter {
public TabsPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new FirstFragment();
case 1:
return new SecondFragment();
case 2:
return new HelpFragment();
}
return null;
}
#Override
public int getCount() {
return 3; // get item count - equal to number of tabs
}
public static void setTabColor(TabHost tabhost) {
for(int i=0;i<tabhost.getTabWidget().getChildCount();i++) {
tabhost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#FF0000")); //unselected
}
tabhost.getTabWidget().getChildAt(tabhost.getCurrentTab()).setBackgroundColor(Color.parseColor("#0000FF")); // selected
}
}

I haven't tested this, but it seems to me that it would work.
Add a Context parameter to the constructor for both TabsPagerAdapter and MyFragment.
Something like this:
TabsPagerAdapter.java:
public class TabsPagerAdapter extends FragmentPagerAdapter {
private Context mCtx;
public TabsPagerAdapter(FragmentManager fragmentManager, Context context) {
super(fragmentManager);
mCtx = context;
}
#Override
public Fragment getItem(int index) {
switch (index) {
case 0:
return new FirstFragment(mCtx);
case 1:
return new SecondFragment(mCtx);
case 2:
return new HelpFragment(mCtx);
}
return null;
}
#Override
public int getCount() {
return 3; // get item count - equal to number of tabs
}
public static void setTabColor(TabHost tabhost) {
for(int i=0;i<tabhost.getTabWidget().getChildCount();i++) {
tabhost.getTabWidget().getChildAt(i).setBackgroundColor(Color.parseColor("#FF0000")); //unselected
}
tabhost.getTabWidget().getChildAt(tabhost.getCurrentTab()).setBackgroundColor(Color.parseColor("#0000FF")); // selected
}
}
MainActivity.java:
mAdapter = new TabsPagerAdapter(this.getSupportFragmentManager(), this);
MyFragment.java (do this in FirstFragment, SecondFragment, and HelpFragment):
public static class MyFragment extends Fragment {
private Context fragmentActivity ;
public MyFragment(Context context){
fragmentActivity = context;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
//.........
return rootView;
}
#Override
public void onLoadAndStoreComplete() {
//do something with fragmentActivity
}
}

It seems the AsyncTask starts too early. suggest loading the db in onActivityCreated(), it's be called after onCreateView
#Override
public void onActivityCreated (Bundle savedInstanceState) {
//load your db here
}

How to save state of Fragments in ViewPager when orientation changes

I have an application that Implements ActionBarSherlock, it's mainly composed of
ViewPager with different content of fragments (for each page), with ViewPager indicator.
Here is my onCreate Method of the Activity that extends SherlockFragmentActivity
// Assume that tabs,sources,types are string arrays e.g. tabs = ["tab1","tab2","tab3"]
// types = ["listview","listview","webview"]
// according to the type of each tab, the type of content of the fragment associated to that tab is determined (e.g. WebView or ListView)
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
srcContext = getBaseContext();
srcActivity = SaudiActivity.this;
int selectPos = 0;
Intent sender = getIntent();
FragmentPagerAdapter mAdapter = new NewsListAdapter(
getSupportFragmentManager());
ViewPager pager = (ViewPager) findViewById(R.id.pager);
pager.setAdapter(mAdapter);
TabPageIndicator indicator = (TabPageIndicator) findViewById(R.id.indicator);
indicator.setViewPager(pager);
pager.setOffscreenPageLimit(tabs.length);
pager.setCurrentItem((tabs.length - 1));
currentPosition = (tabs.length - 1);
indicator.setOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
currentPosition = position;
if ((type[position] == "listview" || type[position]
.equals("listview")) && loaded[position] == false) {
loaded[position] = true;
getNews(listViews[position], position);
}
}
#Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
getSupportActionBar().setCustomView(R.layout.logo);
getSupportActionBar().setDisplayShowCustomEnabled(true);
getSupportActionBar().setDisplayHomeAsUpEnabled(false);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayShowHomeEnabled(false);
Context ctx = getSupportActionBar().getThemedContext();
SourcesAdapter adapter = new SourcesAdapter(ctx,
R.layout.navigation_list_item, src_name, icons, src_value);
}
Here are my News List Adapter (that creates the fragments),
public static class MyViewHolder {
public TextView title;
public ImageView icon;
}
class NewsListAdapter extends FragmentPagerAdapter {
public NewsListAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return new NewsFragment(MyActivity.this, position);
}
// This is the number of pages -- 5
#Override
public int getCount() {
return tabs.length;
}
// This is the title of the page that will apppear on the "tab"
public CharSequence getPageTitle(int position) {
return tabs[position];
}
}
public List<NewsItem> NewsItems;
Finally here's my NewsFragment:
public static class NewsFragment extends Fragment {
private int position;
public NewsFragment() {
}
public NewsFragment(Context ctx, int pos) {
this.position = pos;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = null;
if (type[position].equals("listview")) {
// Put a ListView in the Fragment
} else {
// Put a WebView in the Fragment
}
return view;
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
}
}

Let the fragment handle it's state by overriding onSaveInstanceState and placing the necessary values into outState. Recover that state in onCreateView using savedInstanceState. Also I'm pretty sure that if you're using Actionbarsherlock fragments need to extend SherlockFragment rather than Fragment.

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.