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How to get the current fragment displayed in a specific tab of a viewpager?

I want to get the last fragment in the backstack, or the current displayed it's the same for me, in the tab b_1. As you can see in the following image, I have a ViewPager, and another one inner tab b. Thus there are four current fragments displayed.
Question: How can I get the Fragment 2 instance?
I have seen another solutions, but none works for this scenario.
Annotation: The fragment to return is not necessary the hosted in the ViewPager. I can have opened two more fragments in a tab.
With this method I get all the current visible fragments, but not the one specific I want.
public ArrayList<Fragment> getVisibleFragment() {
List<Fragment> fragments = getSupportFragmentManager().getFragments();
ArrayList<Fragment> visibleFragments = new ArrayList<>();
if (fragments != null) {
for (Fragment fragment : fragments) {
if (fragment != null && fragment.isVisible())
visibleFragments.add(fragment);
}
}
return visibleFragments;
}
Some interesting code
activity_main.xml
<android.support.design.widget.CoordinatorLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar">
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
</android.support.design.widget.AppBarLayout>
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</android.support.design.widget.CoordinatorLayout>
MainActivity.java
public class MainActivity extends AppCompatActivity {
private static ViewPagerAdapter adapter;
private static ViewPager viewPager;
private TabLayout tabLayout;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager();
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
setupTabIcons();
}
private void setupViewPager() {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
// Wrap with HostFragment to get separate tabbed nagivation.
adapter.addFrag(HostFragment.newInstance(new Fragment1()), null);
adapter.addFrag(HostFragment.newInstance(new RootFragment2()), null);
adapter.addFrag(HostFragment.newInstance(new Fragment4()), null);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(2);
}
public void openNewFragment(Fragment fragment) {
HostFragment hostFragment = (HostFragment) adapter.getItem(viewPager.getCurrentItem());
hostFragment.replaceFragment(fragment, true);
}
}
fragment_host.xml
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/hosted_fragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
HostFragment.java
/**
* This class implements separate navigation for a tabbed viewpager.
*
* Based on https://medium.com/#nilan/separate-back-navigation-for-
* a-tabbed-view-pager-in-android-459859f607e4#.u96of4m4x
*/
public class HostFragment extends BackStackFragment {
private Fragment fragment;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreateView(inflater, container, savedInstanceState);
View view = inflater.inflate(R.layout.fragment_host, container, false);
if (fragment != null) {
replaceFragment(fragment, false);
}
return view;
}
public void replaceFragment(Fragment fragment, boolean addToBackstack) {
if (addToBackstack) {
getChildFragmentManager().beginTransaction().replace(R.id.hosted_fragment, fragment).addToBackStack(null).commit();
} else {
getChildFragmentManager().beginTransaction().replace(R.id.hosted_fragment, fragment).commit();
}
}
public static HostFragment newInstance(Fragment fragment) {
HostFragment hostFragment = new HostFragment();
hostFragment.fragment = fragment;
return hostFragment;
}
public Fragment getFragment() {
return fragment;
}
}
fragment2_root.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/fragment2_root"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="#+id/tab2_tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabMode="fixed"
app:tabGravity="fill"/>
<android.support.v4.view.ViewPager
android:id="#+id/tab2_viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:layout_behavior="#string/appbar_scrolling_view_behavior"/>
</LinearLayout>
RootFragment2.java
public class RootFragment2 extends Fragment {
private ViewPagerAdapter adapter;
private ViewPager viewPager;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Inflate the layout for this fragment.
View root = inflater.inflate(R.layout.fragment2_root, container, false);
viewPager = (ViewPager) root.findViewById(R.id.tab2_viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) root.findViewById(R.id.tab2_tabs);
tabLayout.setupWithViewPager(viewPager);
return root;
}
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
// Wrap with HostFragment to get separate tabbed nagivation.
adapter.addFrag(HostFragment.newInstance(new Fragment2()), null);
adapter.addFrag(HostFragment.newInstance(new Fragment3()), null);
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(1);
}
public ViewPagerAdapter getAdapter() {
return adapter;
}
public ViewPager getViewPager() {
return viewPager;
}
}

First define a SparseArray in your ViewPagers' adapters like below. In this array we'll hold the instance of fragments.
SparseArray<Fragment> registeredFragments = new SparseArray<>();
And Override your Adapters' instantiateItem method.
#Override
public Object instantiateItem(ViewGroup container, int position) {
Fragment fragment = (Fragment) super.instantiateItem(container, position);
registeredFragments.put(position, fragment);
return fragment;
}
Also Override destroyItem method of your ViewPagers
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
registeredFragments.remove(position);
super.destroyItem(container, position, object);
}
And define a new method to get your ViewPager Fragments instance.
public Fragment getRegisteredFragment(int position) {
return registeredFragments.get(position);
}
And finally set add a PageChangeListener to your ViewPagers:
viewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
// Here's your instance
YourFragment fragment =(YourFragment)yourPagerAdapter.getRegisteredFragment(position);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
I hope this'll help you. Good luck.
Edit: I'm sorry i cannot understand exactly what you're planning to do but if you need to keep sub fragment (b_1, b_2) instance you can define a method to your activity such as
public void setCurrentFragment(Fragment fragment){
this.currentFragment = fragment;
}
and in your sub view pager's adapter you can call this method like below:
subViewPager.addOnPageChangeListener(new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
// Here's your instance
YourFragment fragment =(YourFragment)yourSubPagerAdapter.getRegisteredFragment(position);
((MyActivity)getActivity).setCurrentFragment(fragment);
}
#Override
public void onPageScrollStateChanged(int state) {
}
});
With this way you can keep one instance and your top fragment.

After some comments with DEADMC, I decided to implement it with extra memory, saving in a list the open fragments.
I explain my solution. I hve two types of special fragments, host and root. Host Fragments are those which are the init of a tab. Root Fragments are those which hold a ViewPager. In this scenario, tab_b has a Root Fragment with an inner ViewPager.
For each tab, this is, for each HostFragment, I have added a list fragments to save the fragments opened in this tab. Also a method getCurrentFragment to get the last displayed in this tab.
public class HostFragment extends BackStackFragment {
private ArrayList<Fragment> fragments = new ArrayList<>();
public Fragment getCurrentFragment() {
return fragments.get(fragments.size() - 1);
}
Also a method to remove the last fragment displayed in this tab is needed, to maintain a true state. Back button needs to be redirect to this method.
public void removeCurrentFragment() {
getChildFragmentManager().popBackStack();
fragments.remove(fragments.size() - 1);
}
Also previous methods need to be changed, to insert the new fragments opened into the list.
public void replaceFragment(Fragment fragment, boolean addToBackstack) {
// NEW: Add new fragment to the list.
fragments.add(fragment);
if (addToBackstack) {
getChildFragmentManager().beginTransaction().replace(R.id.hosted_fragment, fragment).addToBackStack(null).commit();
} else {
getChildFragmentManager().beginTransaction().replace(R.id.hosted_fragment, fragment).commit();
}
}
public static HostFragment newInstance(Fragment fragment) {
HostFragment hostFragment = new HostFragment();
// NEW: Add first fragment to the list.
hostFragment.fragments.add(fragment);
return hostFragment;
}
} // HostFragment.
RootFragment is an interface implemented by those fragments which holds a ViewPager.
public interface RootFragment {
/**
* Opens a new Fragment in the current page of the ViewPager held by this Fragment.
*
* #param fragment - new Fragment to be opened.
*/
void openNewFragment(Fragment fragment);
/**
* Returns the fragment displayed in the current tab of the ViewPager held by this Fragment.
*/
Fragment getCurrentFragment();
}
And then, the implementation would be:
MainActivity is not a Fragment, but I implement RootFragment interface for meaning.
public class MainActivity extends AppCompatActivity implements RootFragment {
private void setupViewPager() {
adapter = new ViewPagerAdapter(getSupportFragmentManager());
// Wrap with HostFragment to get separate tabbed nagivation.
adapter.addFrag(HostFragment.newInstance(new Fragment1()), null);
adapter.addFrag(new RootFragment2(), null); // This is a Root, not a Host.
adapter.addFrag(HostFragment.newInstance(new Fragment4()), null);
viewPager.setAdapter(adapter);
// 2 because TabLayout has 3 tabs.
viewPager.setOffscreenPageLimit(2);
}
#Override
public void openNewFragment(Fragment fragment) {
Fragment hosted = adapter.getItem(viewPager.getCurrentItem());
// Replace the fragment of current tab to [fragment].
if (hosted instanceof HostFragment) {
((HostFragment) hosted).replaceFragment(fragment, true);
// Spread action to next ViewPager.
} else {
((RootFragment) hosted).openNewFragment(fragment);
}
}
#Override
public Fragment getCurrentFragment() {
Fragment hosted = adapter.getItem(viewPager.getCurrentItem());
// Return current tab's fragment.
if (hosted instanceof HostFragment) {
return ((HostFragment) hosted).getCurrentFragment();
// Spread action to next ViewPager.
} else {
return ((RootFragment) hosted).getCurrentFragment();
}
}
}
and RootFragment2
public class RootFragment2 extends Fragment implements RootFragment {
private void setupViewPager(ViewPager viewPager) {
adapter = new ViewPagerAdapter(getActivity().getSupportFragmentManager());
// Wrap with HostFragment to get separate tabbed nagivation.
adapter.addFrag(HostFragment.newInstance(new Fragment2()), null);
adapter.addFrag(HostFragment.newInstance(new Fragment3()), null);
viewPager.setAdapter(adapter);
// 1 because TabLayout has 2 tabs.
viewPager.setOffscreenPageLimit(1);
}
#Override
public void openNewFragment(Fragment fragment) {
((HostFragment) adapter.getItem(viewPager.getCurrentItem())).replaceFragment(fragment, true);
}
#Override
public Fragment getCurrentFragment() {
return ((HostFragment) adapter.getItem(viewPager.getCurrentItem())).getCurrentFragment();
}
}
And then, I just need to call:
((MainActivity) getActivity()).getCurrentFragment();

You can create something like CustomFragment class which contains getClassName method and extends from Fragment class. Then extend all your fragments such as RootFragment2 from CustomFragment class instead of just Fragment.
So you can get fragment like this:
public CustomFragment getNeededFragment(String fragmentName) {
List<Fragment> fragments = getSupportFragmentManager().getFragments();
CustomFragment result = null;
if (fragments != null) {
for (Fragment fragment : fragments) {
if (fragment != null && fragment.isVisible()) {
try {
CustomFragment customFragment = (CustomFragment) customFragment;
if (customFragment.getClassName().equals(fragmentName)))
result = customFragment;
} catch (ClassCastException e) {
}
}
}
}
return result ;
}

I would do something like that:
1. Create a interface like this.
public interface ReturnMyself {
Fragment returnMyself();
}
2. All fragments inside ViewPagers should implements this one.
3. Add OnPageChangeListener to your main VP. So You will always know current position.
4. Add OnPageChangeListener your inner(s) VP so you will know which one is there on screen.
5. Add method to your adapter (both main and inner) which returns your fragment from list passed to it.
public ReturnMyself getReturnMyselfAtPosition()
6. All Fragments should return this in returnMyself()
7. Fragment that has inner fragments should return in returnMyself something like.
Fragment returnMyself() {
return this.myInnerFragmentAdapter.getReturnMyselfAtPosition().returnMyself();
}
8. From main fragment/activity you just call.
this.adapter.getReturnMyselfAtPosition().returnMyself();
And you got your current fragment.

Fragment Tabs not using all space

I'm trying to convert my activity app into a fragment following this tutorial :
http://www.exoguru.com/android/material-design/navigation/material-design-tabs-with-fragments
As I will use only two tabs, I have made this change to BlankFragment
public class BlankFragment extends Fragment {
private PagerSlidingTabStrip tabs;
private static ViewPager viewPager;
private final int int_items = 2;
public BlankFragment() { // Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View x = inflater.inflate(R.layout.fragment_blank, container, false);
tabs = (PagerSlidingTabStrip) x.findViewById(R.id.tab_strip);
viewPager = (ViewPager) x.findViewById(R.id.viewpager);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
tabs.post(new Runnable() {
#Override
public void run() {
tabs.setViewPager(viewPager);
}
});
int[][] tabStates = new int[][] {
new int[] { android.R.attr.state_pressed}, // enabled
new int[] { android.R.attr.state_selected}, // unchecked
new int[] { -android.R.attr.state_selected}
};
int[] tabColors = new int[] {R.color.colorAccent,R.color.colorAccent,R.color.colorAccent};
ColorStateList tabList = new ColorStateList(tabStates, tabColors);
tabs.setTextColor(tabList); // Setting the Tab Text Color
return x;
}
public class MyAdapter extends FragmentPagerAdapter { // Tab Adapter
public MyAdapter(FragmentManager fm) { super(fm); }
#Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new Tab1();
case 1 : return new Tab2();
}
return null;
}
#Override
public int getCount() { return int_items; }
#Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Temps ";
case 1 :
return "Vetement ";
}
return null;
}
}
}
The thing is that I get this result :
As you can see the tabs text is not using all the space like this :
https://raw.githubusercontent.com/joseedwin84/Android-Sliding-Tabs-With-Material-Design/master/tabpic.png
So what does I need to change ?
I tried to check layout and they are all set to match_parent width.
So now I don't know where to look.
If someone can help me, It would be great.

You have to set the tabGravity to fill and tabMode to fixed of your TabLayout.
Either in xml
<android.support.design.widget.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tabLayout"
app:tabGravity="fill"
app:tabMode="fixed" />
Or you can do it in java
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabLayout);
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
tabLayout.setTabMode(TabLayout.MODE_FIXED);

Thanks I'm not using TabLayout but a PagerSlidingTabStrip, and with your answer I found in the documentation that it was a layout problem I should use app:shouldExpand="true"

ViewPager - first fragment always gets re-created when out of view ( onPause -> onStop -> onAttach->...onResume )

So I have implemented a ViewPager with a FragmentStatePagerAdapter and I have 2 fragments. I have called the setOffscreenPageLimit() with arguments 1 and 2 in the hope that the fragments won't be re-created but the 1st one always gets re-created while the second one gets created ones.
The first fragment always goes through these steps, as long as it goes out of view ( slide to right to the other fragment, or hit home button, etc.. )
onPause
onStop
onAttach
onCreate
onCreateView
onStart
onResume
For some reason the second fragment only gets created once and if I swipe to the first fragment, it behaves as expected - it doesn't get re-created unless I hit the home button or the power button. The behavior I want is that the two fragments are created once for the duration of the app.
My fragment structure is the following:
I have an activity with a FrameLayout. I add my SlidingTabFragment to that FrameLayout.
The SlidingTabFragment contains two fragments itself ( 2 Tabs )
The FragmentStatePagerAdapter
public class TabsPagerAdapter extends FragmentStatePagerAdapter {
/** Constructor of the class */
public TabsPagerAdapter(FragmentManager fm, Context context) {
super(fm);
this.mContext = context;
}
/** This method will be invoked when a page is requested to create */
#Override
public Fragment getItem(int arg0) {
switch(arg0){
/** tab1 is selected */
case 0:
Fragment1 frag1 = new Fragment1();
return frag1;
/** tab2 is selected */
case 1:
Fragment2 frag2 = new Fragment2();
return frag2;
}
return null;
}
#Override
public CharSequence getPageTitle(int position) {
return Settings.TAB_TITLES[position];
}
/** Returns the number of pages */
#Override
public int getCount() {
return Settings.TAB_TITLES.length;
}
}
The parent Fragment:
public class SlidingTabFragment extends Fragment {
ViewPager pager = null;
TabsPagerAdapter adapter = null;
SlidingTabLayout tabs = null;
public static SlidingTabFragment newInstance() {
SlidingTabFragment fragment = new SlidingTabFragment();
return fragment;
}
public SlidingTabFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public void onAttach(Activity activity) {
super.onAttach(activity);
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
adapter = new TabsPagerAdapter(getChildFragmentManager(), getActivity());
pager = (ViewPager) view.findViewById(R.id.pager);
pager.setAdapter(adapter);
pager.setOffscreenPageLimit(2);
// Assigning the Sliding Tab Layout View
tabs = (SlidingTabLayout) view.findViewById(R.id.sliding_layout);
tabs.setCustomTabView(R.layout.custom_tab_view, 0);
tabs.setDistributeEvenly(true);
// Setting indicator color to white
tabs.setCustomTabColorizer(new SlidingTabLayout.TabColorizer() {
#Override
public int getIndicatorColor(int position) {
return getResources().getColor(R.color.White);
}
});
tabs.setViewPager(pager);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_sliding_tab, container, false);
}
}
R.layout.fragment_sliding_tab
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/activity_series_details"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.myapp.views.SlidingTabLayout
android:id="#+id/sliding_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="2dp"
android:background="#color/tab_bar_background_color"
/>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_height="0dp"
android:layout_width="match_parent"
android:layout_weight="1" />
</LinearLayout>

Add this to your fragment:
#Override
public void setUserVisibleHint(boolean isVisibleToUser) {
super.setUserVisibleHint(isVisibleToUser);
if (isVisibleToUser) {
// load data here
}else{
// fragment is no longer visible
}
}

Change Fragment with ViewPager

I am using PagerSlidingTab Library for ViewPager. And I want to change Fragment while scrolling of tabs. It is working fine. Check out my code.
I am using AsynTask() on each Fragment.
When the App opens with the MainActivity, First Fragment is attached to the activity, But It shows two AsynTask() dialog message, one from First and another from Second Fragment. And When I scroll to second tab, It shows dialog message of Third Fragment.
So, If I scroll from left to right in tabs, the Fragment right to the current fragment is displayed and if i scroll from right to left, the Fragment left to the current Fragment is displayed.
Please help me to solve the problem.
My Code:
public class PageSlidingTabStripFragment extends Fragment {
public static final String TAG = PageSlidingTabStripFragment.class
.getSimpleName();
public static PageSlidingTabStripFragment newInstance() {
return new PageSlidingTabStripFragment();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.pager, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
PagerSlidingTabStrip tabs = (PagerSlidingTabStrip) view
.findViewById(R.id.tabs);
ViewPager pager = (ViewPager) view.findViewById(R.id.pager);
MyPagerAdapter adapter = new MyPagerAdapter(getChildFragmentManager());
pager.setAdapter(adapter);
tabs.setViewPager(pager);
}
public class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(android.support.v4.app.FragmentManager fm) {
super(fm);
}
private final String[] TITLES = { "Instant Opportunity", "Events",
"Experts" };
#Override
public CharSequence getPageTitle(int position) {
return TITLES[position];
}
#Override
public int getCount() {
return TITLES.length;
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new InstantOpportunity();
case 1:
return new Events();
case 2:
return new Experts();
default:
break;
}
return null;
}
}
}

Explanation:
It turns out there is an easier implementation for scrollable tabs which doesn't involve another library. You can easily implement tabs into your app using normal Android code straight from the default SDK.
The Code
Main Class:
public class PageSlidingTabStripFragment extends Fragment {
//Variables
private ViewPager viewPager;
private PagerTitleStrip pagerTitleStrip;
public PageSlidingTabStripFragment() {
// Required empty public constructor
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//Find your pager declared in XML
viewPager = (ViewPager) getView().findViewById(R.id.pager);
//Set the viewPager to a new adapter (see below)
viewPager.setAdapter(new MyAdapter(getFragmentManager()));
//If your doing scrollable tabs as opposed to fix tabs,
//you need to find a pagerTitleStrip that is declared in XML
//just like the pager
pagerTitleStrip = (PagerTitleStrip)
getView().findViewById(R.id.pager_title_strip);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.[your layout name here], container, false);
}
}
Adapter:
//Note: this can go below all of the previous code. Just make sure it's
//below the last curly bracket in your file!
class MyAdapter extends FragmentStatePagerAdapter {
public MyAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int arg0) {
Fragment fragment = null;
if (arg0 == 0) {
fragment = new InstantOpportunity();
}
if (arg0 == 1) {
fragment = new Events();
}
if (arg0 == 2) {
fragment = new Experts();
}
return fragment;
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
if (position == 0) {
return "Instant Opportunity";
}
if (position == 1) {
return "Events";
}
if (position == 2) {
return "Experts";
}
return null;
}
}
Conclusion:
I hope this helps you understand another way to make scrollable tabs! I have examples on my Github Page about how to make each type (That being Fixed or Scrollable).
Links:
Fixed Tabs Example - Click Here
Scrollable Tabs Example - Click Here
Hope this helps!
Edit:
When asked what to import, make sure you select the V4 support fragments.

please use this example..its very easy.i already implement that.
reference link
hope its useful to you.its best example of pager-sliding-tabstrip.
Use
framelayout compulsory:
FrameLayout fl = new FrameLayout(getActivity());
fl.addView(urFragementView);
and then set your fragement view in this framelayout.

(ActionBar) Tabs + Pager + detail Fragments inside ViewPager container

For ActionBarSherlock I would like to have (Action Bar) Tabs + Pager. I use Fragments inside that pager container. I already got the examples of http://actionbarsherlock.com/ working, but I can't manage to get a details fragment inside that pager container when I would click on let's say a listitem in the first fragment.
Is it impossible to have something like this:
Activity with Tabs and pager container
Fragment A inside pager container under Tab1
Click on something in Fragment A and show Fragment B in same pager container under Tab1.
Fragment A is then not visible, only Fragment B is visible, but also all the Tabs.
At the moment I think only a new activity (which would hold Fragment B inside it) can be started after clicking something in Fragment A.

Here is my solution for the (Tabs + Fragment + ViewPager) it is works for me as i wanted,
hope that works for you as well
here is the xml file
<LinearLayout
android:id="#+id/linearLayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="0dip"
android:layout_height="match_parent"
android:layout_weight="5" />
<FrameLayout
android:id="#+id/fragment_details"
android:layout_width="0px"
android:layout_height="match_parent"
android:layout_weight="4.3" />
</LinearLayout>
here is the code for MainActivity.java I'll post relevant code only so you'll have to manage it
public class MainActivity extends FragmentActivity implements
DialogInterface.OnDismissListener, TabDataResponder {
/** Called when the activity is first created. */
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
artistTab = getSupportActionBar().newTab().setText(
R.string.tab_name_artist);
albumTab = getSupportActionBar().newTab().setText(
R.string.tab_name_album);
songTab = getSupportActionBar().newTab().setText(
R.string.tab_name_songs);
map = new HashMap<String, Integer>();
mViewPager = (ViewPager) findViewById(R.id.pager);
FrameLayout deatil = (FrameLayout) findViewById(R.id.fragment_details);
mDualPane = (deatil != null) && (deatil.getVisibility() == View.VISIBLE);
mTabsAdapter = new TabsAdapter(this, getSupportActionBar(), mViewPager);
if (savedInstanceState != null) {
flag = true;
index = savedInstanceState.getInt("index");
}
setUpTabView();
}
#Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("index", getSupportActionBar()
.getSelectedNavigationIndex());
}
private void setUpTabView() {
mTabsAdapter.addTab(artistTab, ArtistFragment.class, null);
mTabsAdapter.addTab(albumTab, AlbumFragment.class, null);
mTabsAdapter.addTab(songTab, SongFragment.class, null);
getSupportActionBar().setSelectedNavigationItem(index);
}
public static class TabsAdapter extends FragmentPagerAdapter implements
ViewPager.OnPageChangeListener, ActionBar.TabListener {
private FragmentActivity mContext;
private ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<String> mTabs = new ArrayList<String>();
private TabDataResponder responder;
public TabsAdapter(FragmentActivity activity, ActionBar actionBar,
ViewPager pager) {
super(activity.getSupportFragmentManager());
mContext = activity;
mActionBar = actionBar;
mViewPager = pager;
// TabDataResponder is an interface which is implemented in MainActivity
// You can find implementation # the last
responder = (TabDataResponder) activity;
mViewPager.setAdapter(this);
mViewPager.setOnPageChangeListener(this);
//I have used map to save state of the fragment
map.put(SongFragment.TYPE_FRAGMENT.trim(), 0);
map.put(AlbumFragment.TYPE_FRAGMENT.trim(), 0);
map.put(ArtistFragment.TYPE_FRAGMENT.trim(), 0);
}
public void addTab(ActionBar.Tab tab, Class<?> clss, Bundle args) {
mTabs.add(clss.getName());
// mArgs.add(args);
mActionBar.addTab(tab.setTabListener(this));
notifyDataSetChanged();
}
#Override
public int getCount() {
return mTabs.size();
}
#Override
public Fragment getItem(int position) {
return Fragment
.instantiate(mContext, mTabs.get(position), /*
* mArgs.get(
* position)
*/null);
}
#Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
Log.i(TAG, "PageSelected....");
mActionBar.setSelectedNavigationItem(position);
}
#Override
public void onPageScrollStateChanged(int state) {
Log.i(TAG, "ScrollSateChanged....");
}
#Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
}
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
mViewPager.setCurrentItem(tab.getPosition());
String a = null;
if (mDualPane) {
a = mTabs.get(tab.getPosition());
responder.loadData(a, map.get(a));
}
}
#Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
Log.i(TAG, "Tab is released now....");
}
}
#Override
public void onDismiss(DialogInterface dialog) {
setUpTabView();
}
//This interface must be call from fragment class
//# the time of event you want to show detail
// pass the class name in the type argument using class.getName() method
#Override
public void loadData(String type, int index) {
DetailFragment viewer = (DetailFragment) getSupportFragmentManager()
.findFragmentById(R.id.fragment_details);
if (mDualPane) {
if (viewer == null || viewer.getShownIndex() != index
|| viewer.getTypeFragment() != type) {
DetailFragment df = DetailFragment.newInstance(index, type);
getSupportFragmentManager()
.beginTransaction()
.replace(R.id.fragment_details, df)
.setTransition(
FragmentTransaction.TRANSIT_FRAGMENT_FADE)
.commit();
map.put(type.trim(), index);
}
} else {
Intent intent = new Intent();
intent.setClass(MainActivity.this, DetailActivity.class);
intent.putExtra("index", index);
intent.putExtra("type", type);
startActivity(intent);
}
}
}
and here is how i deal with detail fragment not very efficient but kind of working
public class DetailFragment extends Fragment{
public static DetailFragment newInstance(int index, String TYPE_FRAGMENT) {
DetailFragment f = new DetailFragment();
// Supply index input as an argument.
Bundle args = new Bundle();
args.putInt("index", index);
args.putString("type", TYPE_FRAGMENT);
f.setArguments(args);
return f;
}
public int getShownIndex() {
return getArguments().getInt("index", 0);
}
public String getTypeFragment(){
String a = getArguments().getString("type");
return a;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
//template is blank layout
View view = inflater.inflate(R.layout.template, container, false);
if(getTypeFragment().equals(ArtistFragment.TYPE_FRAGMENT)){
view = null;
view = inflater.inflate(R.layout.artist_details, container, false);
//....
}
else if(getTypeFragment().equals(AlbumFragment.TYPE_FRAGMENT)){
//do's for album fragment
}
else if(getTypeFragment().equals(SongFragment.TYPE_FRAGMENT)){
//do's for song fragment
}
return view;
}
}
do not save the state of tab in their individual fragment it will conflict, we are already doing it here

EDIT:
Cheered too soon. Now the details_container is not a viewpager and I cannot use it to 'swipe tabs'.
Found it! Just had to define two FrameLayouts, with in the first one the ViewPager and in the second the details fragments can be 'loaded'. This is done by adding fragments dynamically and replace them.
First the two FrameLayouts:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:fadingEdge="none" >
<FrameLayout
android:id="#+id/main_container"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</FrameLayout>
<FrameLayout
android:id="#+id/details_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</RelativeLayout>
Then replace a fragment dynamically:
// Create new fragment and transaction
Fragment detailsFragment = new ExampleFragment();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
// Replace whatever is in the fragment container view with this fragment
// and add the transaction to the back stack
transaction.replace(R.id.details_container, detailsFragment);
transaction.addToBackStack(null);
// Commit the transaction
transaction.commit();
Very simple and I don't understand why it took me hours to figure this out..

I still did not find a possibility to have a Pager container where fragments should be loaded in and also keep the (ActionBar) Tabs. I have however found a really dirty solution to acomplish this, with starting intens (Main Activity with the Tabs) and finishing the previous ones when the backbutton doesn't need it anymore.
I adapted the code from ABS: Support Demos - Tabs and Pager. But again it's really dirty:
LoaderCursorSupport.CursorLoaderListFragment under Tab2
#Override public void onListItemClick(ListView l, View v, int position, long id) {
Intent intent = new Intent();
intent.setClass(getActivity(), ActionBarTabsPager.class);
intent.putExtra("index", position);
intent.putExtra("fragment", "details");
intent.putExtra("tab", 1);
ActionBarTabsPager.mPreviousActivity = getActivity();
startActivity(intent);
ActionBarTabsPager (Main Activity with Tabs)
public class ActionBarTabsPager extends FragmentActivity {
ViewPager mViewPager;
TabsAdapter mTabsAdapter;
static Activity mPreviousActivity;
static Activity mActivity;
static int mTabPosition = -1;
static Boolean mTabRefreshed = false;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.actionbar_tabs_pager);
getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);
ActionBar.Tab tab1 = getSupportActionBar().newTab().setText("Tab 1");
ActionBar.Tab tab2 = getSupportActionBar().newTab().setText("Tab 2");
ActionBar.Tab tab3 = getSupportActionBar().newTab().setText("Tab 3");
ActionBar.Tab tab4 = getSupportActionBar().newTab().setText("Tab 4");
String fragment = "";
try {
Bundle bundle = this.getIntent().getExtras();
fragment = bundle.getString("fragment");
mTabPosition = bundle.getInt("tab");
} catch (Exception ex) {
}
mViewPager = (ViewPager) findViewById(R.id.pager);
mTabsAdapter = new TabsAdapter(this, getSupportActionBar(), mViewPager);
mTabsAdapter.addTab(tab1, FragmentStackSupport.CountingFragment.class);
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.ECLAIR) {
mTabsAdapter.addTab(tab2, FragmentStackSupport.CountingFragment.class);
mTabsAdapter.addTab(tab3, FragmentStackSupport.CountingFragment.class);
mTabsAdapter.addTab(tab4, FragmentStackSupport.CountingFragment.class);
} else {
if (!fragment.contains("details")) {
mTabsAdapter.addTab(tab2, LoaderCursorSupport.CursorLoaderListFragment.class);
} else {
mTabsAdapter.addTab(tab2, ExampleFragment.class);
}
mTabsAdapter.addTab(tab3, LoaderCustomSupport.AppListFragment.class);
mTabsAdapter.addTab(tab4, LoaderThrottleSupport.ThrottledLoaderListFragment.class);
}
if (savedInstanceState != null) {
getSupportActionBar().setSelectedNavigationItem(savedInstanceState.getInt("index"));
}
if (mTabPosition > -1) {
mTabsAdapter.setPrimaryItem(mTabPosition);
mActivity = this;
}
}
Inside this Class there's a TabsAdapter
public static class TabsAdapter extends FragmentPagerAdapter implements ViewPager.OnPageChangeListener, ActionBar.TabListener {
private final Context mContext;
private final ActionBar mActionBar;
private final ViewPager mViewPager;
private final ArrayList<String> mTabs = new ArrayList<String>();
#Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
if (mTabPosition > -1 && mTabRefreshed) {
int tabPosition = tab.getPosition();
if (mTabPosition != tabPosition) {
if (mPreviousActivity != null) {
mPreviousActivity.finish();
mTabRefreshed = false;
mPreviousActivity = null;
mTabPosition = -1;
Intent intent = new Intent();
intent.setClass(mContext, ActionBarTabsPager.class);
intent.putExtra("fragment", "home");
intent.putExtra("tab", tabPosition);
mActivity.startActivity(intent);
mActivity.finish();
}
}
}
mViewPager.setCurrentItem(tab.getPosition());
}
Can this be done simpler? Or should I just give up on having Tabs together with fragment history? This was done before Android 3.0 with ActivityGroups and Activities, but it seems this can't be done with fragments.

I found the other good example of the same implementation in hear... https://github.com/UweTrottmann/SeriesGuide
In this example under package com.battlelancer.seriesguide.ui
you can find UpcomingRecentActivity.java, and UpcomingFragment.java
and layout upcoming_multipan.xml
this example works for me...
I got one problem while adding different content for detail-fragment the different tabs, it gives me class-cast-exception
so i implemented a common detalFragment class and created separate layout in onCreateView method
but the only one problem i found is layout is not changing on tab switched, may be need to do it by implementing some listener
I'll tell you when i found the answer.