Develop Reference

How to Replace Fragment at runtime with the ChildFragmentManager and this fragment without Title of PagerSlidingTabStrip Xamarin.Android

I want to Change the Pager Layout at runtime with other fragment but without the PagerSlidingTabStrip Title. How .I can make it .
Second how .I can call method home Fragment in another fragments.
Here is The Home Layout
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_marginBottom="50dp"
android:id="#+id/SlidingStrips"
android:layout_marginTop="10dp"
android:layout_below="#id/AcountBalance">
<com.refractored.PagerSlidingTabStrip
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
app:pstsPaddingMiddle="true"
app:pstsDividerWidth="1dp"
app:pstsDividerPadding="5dp"
app:pstsDividerColor="#50FFFFFF"
android:textColor="#50FFFFFF"
app:pstsTextColorSelected="#android:color/white"
app:pstsIndicatorColor="#android:color/white"
app:pstsUnderlineColor="#android:color/white" />
<!--Change this to true if you want to center items-->
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
tools:context=".HomeFragmentLayout" />
</LinearLayout>
And how i'm Adding fragments here is the ChildFragments that added with the parent fragment these two fragments add two tabs with Hour and day Tabs.
public class HomeFragment : Fragment, IOnTabReselectedListener, ViewPager.IOnPageChangeListener
{
View view;
private MyPagerAdapter adapter;
private int count = 1;
private int currentColor;
List<Android.Support.V4.App.Fragment> fragments = new List<Android.Support.V4.App.Fragment>();
public static ViewPager pager;
private PagerSlidingTabStrip tabs;
public override void OnCreate(Bundle savedInstanceState)
{
base.OnCreate(savedInstanceState);
// Create your fragment here
}
public static HomeFragment NewInstance()
{
var frag1 = new HomeFragment { Arguments = new Bundle() };
return frag1;
}
public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState)
{
base.OnCreateView(inflater, container, savedInstanceState);
if (view == null)
{
view = inflater.Inflate(Resource.Layout.HomeFragmentLayout, container, false);
return view;
}
else
{
return view;
}
}
public override void OnViewCreated(View view, Bundle savedInstanceState)
{
base.OnViewCreated(view, savedInstanceState);
try
{
fragments.Add(new HourlyFragment());
fragments.Add(new DayFragment());
adapter = new MyPagerAdapter(ChildFragmentManager, fragments);
pager = view.FindViewById<ViewPager>(Resource.Id.pager);
tabs = View.FindViewById<PagerSlidingTabStrip>(Resource.Id.tabs);
pager.Adapter = adapter;
tabs.SetViewPager(pager);
var pageMargin = (int)TypedValue.ApplyDimension(ComplexUnitType.Dip, 4, Resources.DisplayMetrics);
pager.PageMargin = pageMargin;
pager.CurrentItem = 0;
tabs.OnTabReselectedListener = this;
tabs.OnPageChangeListener = this;
}
catch (System.Exception ex)
{
}
}
.// public void ReplaceFragment(Fragment fragment)
//{
// try
// {
// FragmentManager manager = ChildFragmentManager;
// FragmentTransaction transaction = manager.BeginTransaction();
// transaction.Add(Resource.Id.content_frame, fragment);
// transaction.Commit();
// }
// catch (System.Exception ex)
// {
// }
//}
public void OnTabReselected(int position)
{
Toast.MakeText(Context.ApplicationContext, "Tab reselected: " + position, ToastLength.Short).Show();
}
public void OnPageScrollStateChanged(int state)
{
Console.WriteLine("Page scroll state changed: " + state);
}
public void OnPageScrolled(int position, float positionOffset, int positionOffsetPixels)
{
Console.WriteLine("Page Scrolled");
}
public void OnPageSelected(int position)
{
Console.WriteLine("Page selected: " + position);
}
}
Here is the pager Adapter
public class MyPagerAdapter : FragmentPagerAdapter
{
List<Android.Support.V4.App.Fragment> fragments;
private readonly string[] Titles =
{
"Hour", "Day"
};
public MyPagerAdapter(FragmentManager fm, List<Android.Support.V4.App.Fragment> fragments) : base(fm)
{
this.fragments = fragments;
}
public override ICharSequence GetPageTitleFormatted(int position)
{
return new String(Titles[position]);
}
//}
public override int Count { get { return fragments.Count; } }
public override Fragment GetItem(int position)
{
return fragments[position];
}
public override long GetItemId(int position)
{
return base.GetItemId(position);
}
}

You could do like below,suppose you need to call the replacement method in HomeFragment.
Add below codes in your MyPagerAdapter class (how to replace the fragment at runtime):
private bool[] flags;
public override int GetItemPosition(Java.Lang.Object #object)
{
return PositionNone;
}
public override Java.Lang.Object InstantiateItem(ViewGroup container, int position)
{
if (flags != null && flags[position])
{
/** Get the cached fragment and replace it with a new fragment*/
Android.Support.V4.App.Fragment fragment = (Android.Support.V4.App.Fragment)base.InstantiateItem(container, position);
string fragmentTag = fragment.Tag;
Android.Support.V4.App.FragmentTransaction ft = fm.BeginTransaction();
ft.Remove(fragment);
fragment = fragments[position];
ft.Add(container.Id, fragment, fragmentTag);
ft.Attach(fragment);
ft.Commit();
/** Set to false when the replacement is complete*/
flags[position] = false;
if (fragment != null)
{
return fragment;
}
else
{
return base.InstantiateItem(container, position);
}
}
else
{
return base.InstantiateItem(container, position);
}
}
public void setFragments(List<Android.Support.V4.App.Fragment> fragments)
{
if (this.fragments != null)
{
flags = new bool[fragments.Count];
for (int i = 0; i < fragments.Count; i++)
{
flags[i] = true;
}
}
this.fragments = fragments;
NotifyDataSetChanged();
}
then the replace method in your HomeFragment :
public void ReplaceFragment()
{
fragments[0] = new NewFragment(); //suppose you want to replace the first HourlyFragment
fragments[1] = new DayFragment();
adapter.setFragments(fragments);
}
in the other fragment(for example a click event),you could call the replace method which in the HomeFragment like :
private void Button_Click(object sender, EventArgs e)
{
foreach (Android.Support.V4.App.Fragment fragment in Activity.SupportFragmentManager.Fragments)
{
if (fragment is HomeFragment)
{
((HomeFragment)fragment).ReplaceFragment();
}
}
}

Fragment null when call function viewpager

My Fragment class:
onCreatedView:
parentActivity = (MainActivity) getActivity();
parentView = inflater.inflate(R.layout.fragmentla, container, false);
mFragmentAdapter = new myFragmentAdapter(parentActivity.getSupportFragmentManager(), parentView.getContext());
// Get the ViewPager and set it's PagerAdapter so that it can display items
ViewPager viewPager = (ViewPager) parentView.findViewById(R.id.viewpager);
viewPager.setAdapter(mFragmentAdapter);
// Give the TabLayout the ViewPager
TabLayout tabLayout = (TabLayout) parentView.findViewById(R.id.tablayout);
tabLayout.setupWithViewPager(viewPager);
Thats my fragment (Blue border). My fragment contains toolbar, tablayout, and viewpager.
My FragmentAdapter class:
public class myFragmentAdapter extends FragmentStatePagerAdapter {
final int PAGE_COUNT = 2;
private String tabTitles[] = new String[] { "ITEM1", "ITEM2" };
private Context context;
public myFragmentAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public int getCount() {
return 2;
}
#Override
public Fragment getItem(int position) {
if(position == 0) {
return FirstFragment.newInstance(position + 1);
} else {
return SecondFragment.newInstance(position + 1);
}
}
#Override
public void notifyDataSetChanged() {
super.notifyDataSetChanged();
}
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
}
And this is my FirstFragment class:
public static FirstFragment newInstance(int page) {
Bundle args = new Bundle();
args.putInt(ARG_PAGE, page);
FirstFragment fragment = new FirstFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPage = getArguments().getInt(ARG_PAGE);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
parentView = inflater.inflate(R.layout.fragment_first_newest, container, false);
sometext = (TextView) parentView.findViewById(R.id.wi_my_text);
return parentView;
}
So, my question is: Everytime that I press my menu button in toolbar the textview should change, but this return null cause "onCreatedView" is not called anymore. I tried with this in Fragment class:
public boolean onOptionsItemSelected(MenuItem item){
...
Fragment mFragment = mFragmentAdapter.getItem(0);
if(mFragment instanceof FirstFragment){
((FirstFragment) mFragment).OnButtonPressed();
}
}
Then on my FirstFragment but still getting null exception:
public void OnButtonPressed() {
someText.setText("its working");
createLocationRequest();
}
UPDATED: MY XML:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:id="#+id/wi_my_text"
android:layout_height="24dp"
android:layout_gravity="center"
android:gravity="center"
android:textStyle="bold"
android:paddingEnd="5dp"
android:text="texttest"/>
</LinearLayout>

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();
}
}

ViewPager inside a

I have an activity that has a viewpager fragment in it
one of the pages has another viewpager fragment in it
the problem is, when i reach the page of the inner viewpager fragment, the "onCreateView" of the inner viewpager fragments doesnt get called, and so the page is blank.
Why is that ?
here is my code :
fragment_viewpager.xml
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1" >
</android.support.v4.view.ViewPager>
fragment_viewpager_with_logo.xml
<include layout="#layout/logo" />
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="0px"
android:layout_weight="1" >
</android.support.v4.view.ViewPager>
public class ViewPagerFragment extends Fragment {
private ViewPager fragmentPager;
private PagerAdapter fragmentAdapter;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
if (container instanceof ViewPager) {
return inflater.inflate(R.layout.fragment_viewpager_with_logo, container, false);
}
return inflater.inflate(R.layout.fragment_viewpager, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
fragmentPager = (ViewPager)getView().findViewById(R.id.pager);
fragmentPager.setAdapter(fragmentAdapter);
}
public void setAdapter(PurchaseFragmentStatePagerAdapter fragmentAdapter) {
this.fragmentAdapter = fragmentAdapter;
}
public void setCurrentItem(int i) {
fragmentPager.setCurrentItem(i);
}
public int getCurrentItem() {
return fragmentPager.getCurrentItem();
}
public void setOnPageChangeListener(OnPageChangeListener l) {
if (fragmentPager == null) {
fragmentPager = (ViewPager) getView().findViewById(R.id.pager);
}
fragmentPager.setOnPageChangeListener(l);
}
}
in some activity :
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.fragment_container);
MyFragmentStatePagerAdapter fragmentAdapter = new MyStatePagerAdapter(getSupportFragmentManager());
List<Fragment> fragments = new ArrayList<Fragment>();
fragments.add(settingsFragment);// settings
ViewPagerFragment vpFragment = new ViewPagerFragment();
fragments.add(vpFragment);
fragmentAdapter.setFragments(fragments);
fragmentPager.setAdapter(fragmentAdapter);
MyFragmentStatePagerAdapter innerFragmentAdapter = new MyFragmentStatePagerAdapter(getSupportFragmentManager());
List<Fragment> innerFragments = new ArrayList<Fragment>();
innerFragments.add(settingsFragment);
innerFragmentAdapter.setFragments(innerFragments);
vpFragment.setAdapter(innerFragmentAdapter);
FragmentManager fm = getSupportFragmentManager();
FragmentTransaction ft = fm.beginTransaction();
ft.add(R.id.content_fragment, fragmentPager).commit();
}
MyFragmentStatePagerAdapter
public class MyFragmentStatePagerAdapter extends FragmentStatePagerAdapter {
private List<BaseFragment> fragments;
#Inject
public MyFragmentStatePagerAdapter(FragmentManager fm) {
super(fm);
}
public void setFragments(List<Fragment> fragments) {
this.fragments = fragments;
}
#Override
public BaseFragment getItem(int position) {
return fragments.get(position);
}
#Override
public int getCount() {
return fragments == null ? 0 : fragments.size();
}
}

In the Fragment use fragment.getChildFragmentManager() in FragmentPagerAdapter's constructor instead of getActivity().getFragmentManager()

Viewpager and Sherlock Fragments. How to do somethng inside fragment from FragmentActivity?

I have a parent SherlockFragmentActivity class that contains ViewPager with 4 Fragments inside.
One of them extends from SherlockListFragment and I want to scroll it to top by click on it's tab.
MainActivity class:
public class MainActivity extends SherlockFragmentActivity {
ViewPager viewPager;
TabAdapter tabAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
setTheme(Constants.THEME);
viewPager = new ViewPager(this);
viewPager.setId(R.id.pager);
viewPager.setBackgroundResource(R.color.background_color);
tabAdapter = new TabAdapter(this,viewPager);
super.onCreate(savedInstanceState);
setContentView(viewPager);
// Action bar setup
setupTabs(savedInstanceState);
}
private void setupTabs(Bundle savedInstanceState) {
final ActionBar actionBar = getSupportActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
for (int i = 1; i <= 4; i++) {
ActionBar.Tab tab = getSupportActionBar().newTab();
switch (i) {
case 1:
tab.setText(R.string.feed).setTabListener(tabAdapter);
tabAdapter.addTab(EventListFragment.class);
break;
case 2:
tab.setText(R.string.downloads).setTabListener(tabAdapter);
tabAdapter.addTab(LocalEventListFragment.class);
break;
case 3:
tab.setText(R.string.tags).setTabListener(tabAdapter);
tabAdapter.addTab(TagsFragment.class);
break;
case 4:
tab.setText(R.string.settings).setTabListener(tabAdapter);
tabAdapter.addTab(SettingsFragment.class);
break;
}
getSupportActionBar().addTab(tab);
}
}
TabAdapter class:
public static class TabAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener, ActionBar.TabListener {
private final Context mContext;
private final ArrayList<Class<?>> classes = new ArrayList<Class<?>>();
private final ArrayList<Fragment> mFragments = new ArrayList<Fragment>();
private final ActionBar mActionBar;
private final ViewPager mViewPager;
public TabAdapter(SherlockFragmentActivity activity, ViewPager pager){
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = activity.getSupportActionBar();
mViewPager = pager;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
}
public void addTab(Class<?> clss){
classes.add(clss);
mFragments.add(Fragment.instantiate(mContext, clss.getName(),
null));
}
#Override
public Fragment getItem(int i) {
return mFragments.get(i);
}
public int getId(int index){
return mFragments.get(index).getId();
}
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
// fixed double call onTabReselected
if (mActionBar.getSelectedNavigationIndex() != position)
mActionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrollStateChanged(int i) {
}
#Override
public int getCount() {
return 4;
}
#Override
public void onTabSelected(ActionBar.Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(ActionBar.Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabReselected(ActionBar.Tab tab, FragmentTransaction ft) {
final int position = tab.getPosition();
final Fragment fragment = mFragments.get(position);
if (fragment != null) {
switch (position) {
case 0:
// call tab's ListFragment scroll to top item
((EventListFragment) fragment).scrollToTop();
break;
case 1:
// do something
break;
}
}
}
onTabReselected called, then user press current tab, so I try to do EventListFragment scrolling:
EventListFragment class:
public class EventListFragment extends SherlockListFragment {
#Override
public void onCreate(Bundle state) {
super.onCreate(state);
mAdapter = new EventListAdapter(getSherlockActivity());
setListAdapter(mAdapter);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setRetainInstance(true);
}
#Override
public final View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View eventListLayout = inflater.inflate(R.layout.eventlist_fragment,null);
ListView lv = (ListView) eventListLayout.findViewById(android.R.id.list);
ViewGroup parent = (ViewGroup) lv.getParent();
//Remove ListView and add PullToRefreshListView in its place
int lvIndex = parent.indexOfChild(lv);
parent.removeViewAt(lvIndex);
mPullToRefreshListView = onCreatePullToRefreshListView(inflater, savedInstanceState);
parent.addView(mPullToRefreshListView, lvIndex, lv.getLayoutParams());
return eventListLayout;
}
public void scrollToTop() {
if (getSherlockActivity() != null) { // null after screen rotation
final ListView listView = getListView();
listView.post(new Runnable(){
public void run() {
listView.smoothScrollToPosition(0);
}});
}
}
It works on application start, but after screen rotation scrollToTop - getSherlockActivity() returns null.
If remove this condition check, have an exception:
java.lang.IllegalStateException: Content view not yet created
at android.support.v4.app.ListFragment.ensureList(ListFragment.java:328)
at android.support.v4.app.ListFragment.getListView(ListFragment.java:222)
at com.project.fragment.EventListFragment.scrollToTop(EventListFragment.java:337)
at com.project.MainActivity$TabAdapter.onTabReselected(MainActivity.java:411)
at com.actionbarsherlock.internal.app.ActionBarWrapper$TabWrapper.onTabReselected(ActionBarWrapper.java:327)
I haven't totally understatinding how to ViewPager and its FragmentPagerAdapter works. So can't find a problem, that occurs.

Use this FragmentPageAdapter:
public class TestFragmentAdapter extends FragmentPagerAdapter implements IconPagerAdapter {
protected static final String[] CONTENT = new String[] { "CATEGORIAS", "PRINCIPAL", "AS MELHORES", };
protected static final int[] ICONS = new int[] {
R.drawable.perm_group_calendar,
R.drawable.perm_group_camera,
R.drawable.perm_group_device_alarms,
};
private int mCount = CONTENT.length;
public TestFragmentAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {Fragment f = null;
switch(position){
case 0:
{
f = new ArrayListFragment();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
case 1:
{
f = new HomeFragment();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
case 2:
{
f = new EndlessCustomView();//YourFragment
// set arguments here, if required
Bundle args = new Bundle();
f.setArguments(args);
break;
}
default:
throw new IllegalArgumentException("not this many fragments: " + position);
}
return f;
}
#Override
public int getCount() {
return mCount;
}
#Override
public CharSequence getPageTitle(int position) {
return TestFragmentAdapter.CONTENT[position % CONTENT.length];
}
#Override
public int getIconResId(int index) {
return ICONS[index % ICONS.length];
}
public void setCount(int count) {
if (count > 0 && count <= 10) {
mCount = count;
notifyDataSetChanged();
}
}
}
This Activity:
public class BaseSampleActivity extends SlidingFragmentActivity {
private static final Random RANDOM = new Random();
TestFragmentAdapter mAdapter;
ViewPager mPager;
PageIndicator mIndicator;
protected ListFragment mFrag;
#Override
public void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.themed_titles);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
mAdapter = new TestFragmentAdapter(getSupportFragmentManager());
mPager = (ViewPager)findViewById(R.id.pager);
mPager.setAdapter(mAdapter);
mPager.setCurrentItem(1);
mIndicator = (TitlePageIndicator)findViewById(R.id.indicator);
mIndicator.setViewPager(mPager);
}

Applied solution according to this post:
MainActivity class:
//...
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
FragmentManager manager = getSupportFragmentManager();
for (int i = 0; i < tabAdapter.getClasses().size(); i++) {
String className = tabAdapter.getClasses().get(i).getName();
if (manager.findFragmentByTag(className) != null) {
manager.putFragment(outState, className, manager.findFragmentByTag(className));
}
}
}
//...
TabAdapter class:
//...
public void addTab(Class<?> clss, FragmentManager manager, Bundle savedInstanceState) {
classes.add(clss);
String className = clss.getName();
tags.add(className);
Fragment fragment;
if (savedInstanceState != null) {
fragment = manager.getFragment(savedInstanceState, className);
if (fragment == null) {
fragment = createFragment(className);
manager.beginTransaction().add(fragment, className);
}
} else {
fragment = createFragment(className);
manager.beginTransaction().add(fragment, className);
}
mFragments.add(fragment);
}
//...
where createFragment is a simple method, that creates needed fragment by passed class name.