Develop Reference

How to replace the first Fragment of ViewPager with another Fragment and be at the same position of the previous Fragment

I'm using TabLayout and ViewPager in my app . I have 2 tabs in my ViewPager . I have the main 2 Fragment for the 2 tabs .
The first Fragment is like a form when user click submit , another Fragment appears to user and so on and be at the same position of the previous Fragment. I want to do that in the first Fragment (first position of my ViewPager) and keep the state of the previous fragment when I click back button . I hope that I posted my question in a right way
Here is my ViewPager
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
tools:context=".UI.Fragments.OnlineBookingModule.OnlineBookingFragment">
<com.google.android.material.tabs.TabLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/tabLayout"
app:tabIndicatorColor="#color/colorPrimary"
android:background="#color/bg_nav"/>
<androidx.viewpager.widget.ViewPager
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="#+id/viewPager"/>
</LinearLayout>
Here is My Pager Adapter
public class BookingPagerAdapter extends FragmentStatePagerAdapter {
private Context context;
public BookingPagerAdapter(#NonNull FragmentManager fm, int behavior,Context context) {
super(fm, behavior);
this.context=context;
}
#NonNull
#Override
public Fragment getItem(int position) {
if(position==0)
return new NewBookingFragment();
else
return new FutureBookingFragment();
}
#Override
public int getCount() {
return 2;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
if(position==0)
return context.getString(R.string.new_booking);
else
return context.getString(R.string.future_booking);
}
}
Here is how I setup my viewPager in my Fragment
#RequiresApi(api = Build.VERSION_CODES.JELLY_BEAN_MR1)
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
view = inflater.inflate(R.layout.fragment_online_booking, container, false);
tabLayout = view.findViewById(R.id.tabLayout);
viewPager = view.findViewById(R.id.viewPager);
Preferences preferences = new Preferences();
preferences.saveSmallDays(getActivity(),0);
preferences.saveBigDays(getActivity(),0);
assert getFragmentManager() != null;
pagerAdapter = new BookingPagerAdapter(getFragmentManager(), FragmentStatePagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT,getActivity());
tabLayout.setupWithViewPager(viewPager);
viewPager.setAdapter(pagerAdapter);
return view;
}

TabLayout don't get populated with ViewPager at all

I try to populate a TabLayout with a ViewPager but unfortunately it doesn't get populated.
I followed this tutorial to get in touch: TabLayout and ViewPager in your Android App. The tutorial uses the old Support Library v4. My project is based on AndroidX and i want to stay with it. The official documentation of TabLayout said that I need to create the TabLayout inside the ViewPager but that's not working at all. So i created the following XML layout file:
<LinearLayout
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tab_layout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/primaryColor"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabTextColor="#color/primaryTextColor" />
</androidx.viewpager.widget.ViewPager>
</LinearLayout>
I setup the ViewPager with the following lines to connect TabLayout with ViewPager:
public class MyActivity extends AppCompatActivity {
...
#Override
public void onCreate(final Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.my_layout);
...
// tab layout
ViewPager viewPager = findViewById(R.id.viewpager);
MyFragmentPagerAdapter adapter = new MyFragmentPagerAdapter(this, getSupportFragmentManager());
viewPager.setAdapter(adapter);
TabLayout tabLayout = findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(viewPager);
...
}
...
}
My Adapter is a FragmentPagerAdapter
public class MyFragmentPagerAdapter extends FragmentPagerAdapter {
private Context context;
public MyFragmentPagerAdapter(Context context, FragmentManager fm) {
super(fm);
this.context = context;
}
#Override
public Fragment getItem(int position) {
if (position == 0) {
return new MyFragment1();
} else {
return new MyFragment2();
}
}
#Override
public int getCount() {
return 2;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return context.getString(R.string.building);
case 1:
return context.getString(R.string.buff);
default:
return null;
}
}
}
One of my Fragments looks like this:
public class MyFragment1 extends Fragment {
public MyFragment () {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_building, container, false);
}
}
Here is a picture how it looks like:
Empty ViewPager
Question
So why is the TabLayout not populated at all? I'm working with Android Studio and the Design Manager just shows me an empty TabLayout and ViewPager. I guess, it would precompile the TabLayout but it is just empty...
Please help me because i stuck at this topic. I really want to code it like this to get benefit of swiping tabs and stuff.
Thanks a lot!

Here is an example from one of my projects .Create and populate ViewPager, something like this:
<androidx.viewpager.widget.ViewPager
android:id="#+id/loginViewPager"
android:layout_width="match_parent"
android:layout_height="0dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/loginTitle">
<com.google.android.material.tabs.TabLayout
android:id="#+id/loginTabContainer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="top"
app:tabIndicatorColor="#color/colorPrimary"
app:tabRippleColor="#color/colorPrimary"
app:tabSelectedTextColor="#color/colorPrimaryDark"
app:tabTextAppearance="#style/TabLayoutTheme">
<com.google.android.material.tabs.TabItem android:text="first tab" />
<com.google.android.material.tabs.TabItem android:text="second tab" />
</com.google.android.material.tabs.TabLayout>
</androidx.viewpager.widget.ViewPager>
Then in your activity create a FragmentStatePagerAdapter to decide what to return in each page. my codes are in kotlin, but java version is the same:
private inner class ScreenSlidePagerAdapter(fm: FragmentManager) : FragmentStatePagerAdapter(fm) {
override fun getCount(): Int = NUM_PAGES
override fun getItem(position: Int): Fragment = when (position) {
1 -> FirstFragment()
0 -> SecondFragment()
else -> FirstFragment()
}
override fun getPageTitle(position: Int): CharSequence? {
return when (position) {
0 -> "First Title"
1 -> "Second Title"
else -> "First Title"
}
}
}
And finally in your Activity:
val pagerAdapter = ScreenSlidePagerAdapter(supportFragmentManager)
loginViewPager.adapter = pagerAdapter

Put your TabLayout inside your ViewPager like below.
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewPager"
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.google.android.material.tabs.TabLayout xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
app:tabBackground="#color/colorPrimaryDark"
app:tabGravity="fill"
app:tabIndicatorColor="#color/colorPrimaryLight"
app:tabMaxWidth="0dp"
app:tabMode="scrollable"
app:tabRippleColor="#color/colorPrimaryLight"
app:tabSelectedTextColor="#color/colorPrimaryLight"
app:tabTextColor="#android:color/white" />
</androidx.viewpager.widget.ViewPager>
make sure that android:layout_height of your TabLayout is set to wrap_content.
When you put your TabLayout inside your ViewPager, you don't need to keep below lines:
TabLayout tabLayout = findViewById(R.id.tab_layout);
tabLayout.setupWithViewPager(viewPager);
Everything else in your code is correct.
Also, now that I see your code, layout_height of your TabLayout is set to match_parent, so TabLayout is taking whole space in your screen, giving no height to ViewPager, also, in your XML, there is no container to hold your ViewPager and TabLayout (like LinearLayout, FrameLayout etc).

<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
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="scrollable"
app:tabGravity="fill"
style="#style/Base.Widget.Design.TabLayout"/>
</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" />
viewPager = (ViewPager)rootView. findViewById(R.id.viewpager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getFragmentManager());
adapter.addFragment(new FragAllONE(), "ONE");
adapter.addFragment(new FragAllTWO(), "TWO");
viewPager.setAdapter(adapter);
viewPager.setOffscreenPageLimit(1);
viewPager.setCurrentItem(0);
viewPager.addOnPageChangeListener(this);
tabLayout = (TabLayout)rootView. findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
private class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position)
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public void addFragment(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public Object instantiateItem(ViewGroup container, int position) {
Object object = super.instantiateItem(container, position);
if (object instanceof Fragment) {
Fragment fragment = (Fragment) object;
String tag = fragment.getTag();
}
return object;
}
public void restoreState(Parcelable state, ClassLoader loader) {
}
#Override
public int getItemPosition(Object object) {
return POSITION_NONE;
}
}

I found a solution on another thread Use Tab layout in MVVM architecture with the data binding library. I'm using Android Data Binding so the TabLayout wasn't assigned to the ViewPager. So my code was correct but not accordingly to the Data Binding.
Nevertheless, thanks for your posts here!

Android studio: how add tabs with ViewPager

I want to add in a fragment a tab with pagerview (scrollable).
public class MyFragment extends Fragment {
private FragmentTabHost tabHost;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
tabHost = new FragmentTabHost(getActivity());
tabHost.setup(getActivity(), getChildFragmentManager(), R.id.realtabcontent);
tabHost.addTab(tabHost.newTabSpec("one").setIndicator("One"), OneFragment.class, null);
tabHost.addTab(tabHost.newTabSpec("two").setIndicator("Two"), TwoFragment.class, null);
return tabHost;
}
#Override
public void onDestroyView(){
super.onDestroyView();
tabHost=null;
}
}
With this layout
<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.app.FragmentTabHost
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#android:id/tabhost"
android:layout_width="match_parent"
android:layout_height="match_parent">
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/realtabcontent"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
</android.support.v4.app.FragmentTabHost>
I tried several solutions, but do not work.
I need to use fragment, not fragmentActivity.
The code written up work.

Small Code for Tablayout + ViewPager
// find views by id
ViewPager vp= findViewById(R.id.viewpager);
TabLayout tl = findViewById(R.id.tablayout);
// attach tablayout with viewpager
tl.setupWithViewPager(vp);
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
// add your fragments
adapter.addFrag(new SampleFragment(), "Tab1");
adapter.addFrag(new SampleFragment(), "Tab2");
adapter.addFrag(new SampleFragment(), "Tab3");
// set adapter on viewpager
vp.setAdapter(adapter);
XML layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
Note If you are not using AndroidX yet, you need to change following in layout.
Change com.google.android.material.tabs.TabLayout to android.support.design.widget.TabLayout
Chagne androidx.viewpager.widget.ViewPager to android.support.v4.view.ViewPager
But I'll strongly recommend to migrate to AndroidX, see #this answer to understand why.
And this is common ViewPagerAdapter for all your Viewpager in app.
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public void addFrag(Fragment fragment) {
mFragmentList.add(fragment);
mFragmentTitleList.add("");
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
If you need to set ViewPager in Fragment, please check #this answer.

Used xml file like this:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.design.widget.TabLayout
android:id="#+id/tabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
app:tabGravity="fill"
app:tabMode="fixed"
app:tabMaxWidth="0dp"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<!-- View pager to swipe views -->
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_width="match_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
and your java file is here:
public class MyFragment extends Fragment {
private View view;
private TabLayout tabLayout;
//This is our viewPager
private ViewPager viewPager;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.sticker_fragment, container, false);
tabLayout = (TabLayout) view.findViewById(R.id.tabLayout);
viewPager = (ViewPager) view.findViewById(R.id.pager);
Viewpager adapter = new Viewpager(getActivity().getSupportFragmentManager(), getActivity());
//Adding adapter to pager
viewPager.setAdapter(adapter);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
return view;
}
}
after that viewpager adapter is like this:
public class Viewpager extends FragmentStatePagerAdapter {
final int PAGE_COUNT = 2;
private String tabTitles[] = new String[]{"Local","Online"};
private Context context;
public Viewpager(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
OneFragment oneFragment=new OneFragment();
return oneFragment;
case 1:
TwoFragment twoFragment=new TwoFragment();
return twoFragment;
default:
return null;
}
}
#Override
public int getCount() {
return tabTitles.length;
}
#Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
}

Dynamically replace fragment when using tablayout and viewpager in android

I have struggled in the past couple of days to find the solution to this problem:
I have one activity which contains a tab layout and a view pager. The view pager is filled with fragments using an adapter. Tabs are created with this viewpager and are fixed. My question is how can I change the layout of tabs dynamically (for example after a button click) ?
This is xml file
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_height="match_parent"
tools:context=".MainActivity"
android:orientation="vertical">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark" />
<android.support.design.widget.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="65dp"
android:background="#color/white"
app:tabMode="fixed"
app:tabGravity="fill"
android:theme="#style/ThemeOverlay.AppCompat.Dark" />
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"/>
</LinearLayout>
This is Activity:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setupToolbar();
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tablayout);
setupTabLayout(tabLayout);
}
private void setupToolbar(){
...
}
public void setupViewPager(ViewPager viewPager) {
pageAdapter = new FragmentPageAdapter(getApplicationContext(), getSupportFragmentManager());
pageAdapter.addFragment(ContentFragment.newInstance(), "Following", R.drawable.following);
pageAdapter.addFragment(ContentFragment.newInstance(), "Discover", R.drawable.flower);
pageAdapter.addFragment(ContentFragment.newInstance(), "", R.drawable.camera);
pageAdapter.addFragment(ProfileFragment.newInstance(), "Profile", R.drawable.profile);
pageAdapter.addFragment(ContentFragment.newInstance(), "Task List", R.drawable.list);
viewPager.setAdapter(pageAdapter);
}
public void setupTabLayout(TabLayout tabLayout) {
try {
tabLayout.setupWithViewPager(viewPager);
for (int i = 0; i < tabLayout.getTabCount(); i++) {
TabLayout.Tab tab = tabLayout.getTabAt(i);
tab.setCustomView(pageAdapter.getTabView(i));
}
tabLayout.requestFocus();
}
catch(Exception ex){
Log.e("errr2", ex.getMessage());
}
}
This is adapter:
public class FragmentPageAdapter extends FragmentStatePagerAdapter {
private Context mContext;
private List<Fragment> mFragments = new ArrayList<>();
private List<String> mFragmentTitles = new ArrayList<>();
private List<Integer> mFragmentIcons = new ArrayList<>();
public FragmentPageAdapter(Context context, FragmentManager fm) {
super(fm);
this.mContext = context;
}
public void addFragment(Fragment fragment, String title, int drawable) {
mFragments.add(fragment);
mFragmentTitles.add(title);
mFragmentIcons.add(drawable);
}
#Override
public Fragment getItem(int position) {
return mFragments.get(position);
}
#Override
public int getItemPosition(Object object)
{
return POSITION_UNCHANGED;
}
#Override
public int getCount() {
return mFragments.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitles.get(position);
}
public View getTabView(int position) {
View tab = LayoutInflater.from(mContext).inflate(R.layout.tabbar_view, null);
TextView tabText = (TextView) tab.findViewById(R.id.tabText);
ImageView tabImage = (ImageView) tab.findViewById(R.id.tabImage);
tabText.setText(mFragmentTitles.get(position));
tabImage.setBackgroundResource(mFragmentIcons.get(position));
if (position == 3) {
tab.setSelected(true);
}
return tab;
}
}
The normal way to replace a fragment is by calling
fragmentManager.beginTransaction().replace(placeholderId, editPrifileFragment).commit();
but what should I use for placeholderId in this case ? because in activity layout I don't have a placeholder for fragments, just a viewpager.
So how can I replace the fragment dynamically and also keep the back button functionality ?
I have searched a lot and found some hacky solutions , but I think this is a very common situation and should have a better solution.
thanks.

Your ViewPager Fragment should hold the placeholderId.
So in your Fragment (which is part of the ViewPager) you can call getChildFragmentManager() to add Fragment like you usually do.
childFragmentManager.beginTransaction().add(placeholderId, editPrifileFragment).addToBackStack(null).commit();

How to set a ViewPager inside a Fragment

I need to place a ViewPager inside of a fragment, but I have two fragments, Fragment 1 is my MENU, and Fragment 2 I want to use as a ViewPagerIndicator.
But a fragment can't have another fragment... what do I need to do for that?

Starting in Android 4.2, there are nested fragments.http://developer.android.com/about/versions/android-4.2.html#NestedFragments The support library now also includes support for this for older Android versions.
So you can do something like this:
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
ViewPager mViewPager = (ViewPager) view.findViewById(R.id.viewPager);
mViewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
}
Full implementation available here: https://github.com/marcoRS/nested-fragments/tree/master/src/com/burnside/digital/nestedfragments

You must use getChildFragmentManager() instead of getSupportFragmentManager() to get the FragmentManger inside a Fragment.
But you should not use FragmentStatePagerAdapter rather than FragmentPagerAdapter.

Just use getChildFragmentManager() instead of getSupportFragmentManager() inside Fragments.
Inside Fragments
new ViewPagerAdapter(getChildFragmentManager());
Inside Activity
new ViewPagerAdapter(getSupportFragmentManager());
Simple Code
fragment_sample.xml layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<com.google.android.material.tabs.TabLayout
android:id="#+id/tablayout"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
<androidx.viewpager.widget.ViewPager
android:id="#+id/viewpager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1" />
</LinearLayout>
SampleFragment.java class
public class SampleFragment extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.fragment_sample, container, false);
return fragmentView;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// find views by id
ViewPager viewPager = view.findViewById(R.id.viewpager);
TabLayout tabLayout = view.findViewById(R.id.tablayout);
// attach tablayout with viewpager
tabLayout.setupWithViewPager(viewPager);
ViewPagerAdapter adapter = new ViewPagerAdapter(getChildFragmentManager());
// add your fragments
adapter.addFrag(new SampleFragment(), "Tab1");
adapter.addFrag(new SampleFragment2(), "Tab2");
adapter.addFrag(new SampleFragment3(), "Tab3");
// set adapter on viewpager
viewPager.setAdapter(adapter);
}
}
ViewPagerAdapter.java class
// common adapter for all view pager in your project.
public class ViewPagerAdapter extends FragmentStatePagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
public void addFrag(Fragment fragment) {
mFragmentList.add(fragment);
mFragmentTitleList.add("");
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
Important Related Links
Difference between getSupportFragmentManager() and getChildFragmentManager()?
getSupportFragmentManager() versus getFragmentManager() in android 3.0+
Difference between FragmentPagerAdapter and FragmentStatePagerAdapter

it is possible. try to do this code view_pager_fragment.xml file
<android.support.design.widget.AppBarLayout
android:id="#+id/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/tab"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</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" />
ViewPagerFragment
ViewPager viewPager;
TabLayout tabLayout;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tracks, container, false);
viewPager = (ViewPager) view.findViewById(R.id.viewpager);
tabLayout = (TabLayout) view.findViewById(R.id.tab);
return view;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
setupViewPager(viewPager);
tabLayout.setupWithViewPager(viewPager);
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter viewPagerAdapter = new ViewPagerAdapter(getChildFragmentManager());``
viewPager.setAdapter(viewPagerAdapter);
}
private class ViewPagerAdapter extends FragmentPagerAdapter {
public ViewPagerAdapter(FragmentManager fragmentManager) {
super(fragmentManager);
}
#Override
public Fragment getItem(int position) {
if(position == 0) return new FirstFragment();
if(position == 1) return new SecoundFragment();
if(position == 2) return new LoginFragment();
throw new IllegalStateException("Position is unexpectedly " + position);
}
#Override
public int getCount() {
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
if(position == 0) return "First";
if(position == 1) return "Secound";
if(position == 2) return "Login";
throw new IllegalStateException("Position is unexpectedly " + position);
}
}

With the Android Support V4 library, you can add a fragment inside another fragment. Try to use it, it may can resolve your problem.

After Read some examples, you cant have a FragmentActivity inside a fragmentActivity.
Is not necesary to have two fragments and this need be a FragmentPageAdapter... i only need to do this.
<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>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_weight="0"
android:gravity="center"
android:measureWithLargestChild="true"
android:orientation="horizontal" >
<Button
android:id="#+id/first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="First" >
</Button>
<Button
android:id="#+id/last"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Last" >
</Button>
</LinearLayout>
Source:
http://www.truiton.com/2013/05/android-fragmentpageradapter-example/