I have a small problem with my application which uses a FragmentStatePagerAdapter when scrolling between pages.
First I'll describe how the application is built with a stripped down version.
App description
I have one Activity which holds everything together. This Activity in turn hosts a Fragment, in this case called Pager.
This Pager-class has a ViewPager within, with a FragmentStatePagerAdapter as an inner class which is used to provide the fragments for the ViewPager. The fragments provided to the ViewPager are instances of FragmentA.
FragmentA has its own content and its own items on the ActionBar, but can also in turn open other fragments. In my "Real" application this can be done either by clicking some item in a ListView or by clicking a button on the ActionBar. In this simplified case FragmentA can open up FragmentB via a button.
So far this works just as it should.
Problem
When FragmentB is opened from any of the FragmentA-fragments it is properly displayed with its own content and menu in the ActionBar, replacing the menu of FragmentA. However, when navigating back via the back-button the ActionBar for FragmentA is never restored to the state the FragmentA-actionbar had prior to opening FragmentB, instead it's empty.
Possibly strange behaviour
When I change so that MainPagerAdapter extends FragmentPagerAdapter instead of FragmentStatePagerAdapter, all of a sudden it works just fine, and I really don't understand why this is. Also, manually calling supportInvalidateOptionsMenu() did not work at all when the Fragment was contained within a FragmentStatePagerAdapter.
I looked in to the source of both of the adaptertypes but I couldn't figure out why one of them worked while the other didn't.
MainActivity.java
public class MainActivity extends ActionBarActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getSupportFragmentManager()
.beginTransaction()
.addToBackStack("Start")
.replace(R.id.container, new Pager())
.commit();
}
public void openB() {
getSupportFragmentManager()
.beginTransaction()
.addToBackStack("Start1")
.replace(R.id.container, new FragmentB())
.commit();
}
}
activity_main.xml
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/container">
</RelativeLayout>
Pager.java
public class Pager extends Fragment {
ViewPager mViewPager;
MainPagerAdapter mainPagerAdapter;
#Override
public void onCreate(Bundle savedInstanceState) {
setHasOptionsMenu(true);
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.wrapper_layout, null);
mViewPager = (ViewPager)v.findViewById(R.id.viewpager);
mainPagerAdapter = new MainPagerAdapter(getChildFragmentManager());
mViewPager.setAdapter(mainPagerAdapter);
return v;
}
private class MainPagerAdapter extends FragmentStatePagerAdapter {
public MainPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
return new FragmentA();
}
#Override
public int getCount() {
return 2;
}
}
}
wrapper_layout.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/viewpager"
android:layout_width="fill_parent"
android:layout_height="fill_parent" />
</LinearLayout>
FragmentA.java
public class FragmentA extends Fragment {
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
menu.add("A-Menu");
}
#Override
public void onCreate(Bundle savedInstanceState) {
setHasOptionsMenu(true);
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.a, null);
Button b = (Button)v.findViewById(R.id.button2);
b.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
getActivity().supportInvalidateOptionsMenu();
}
});
Button b2 = (Button)v.findViewById(R.id.button);
b2.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
((MainActivity)getActivity()).openB();
}
});
return v;
}
}
a.xml
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="B"
android:id="#+id/button"
android:layout_gravity="center_horizontal"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Invalidate"
android:id="#+id/button2"
android:layout_gravity="right"
/>
</LinearLayout>
FragmentB.java
public class FragmentB extends Fragment{
#Override
public void onCreate(Bundle savedInstanceState) {
setHasOptionsMenu(true);
super.onCreate(savedInstanceState);
}
#Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
menu.clear();
menu.add("B-Menu");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.b, null);
return v;
}
}
Related
I am sending data from one fragment to another, using interface. This works absolutely fine. Now I am trying to use onSaveInstanceState() to save the value in
a Fragment and retrieving in onCreate(). however i'm getting null in Bundle of onCreate(). P.S. everything works fine when i set the Fragment directly into the activity layout in xml. but when i set the fragment through java code into the activity, the onSaveInstanceState is failing. It is not saving the last known value. Please help. Pasting the code below. You can try it out to know the exact issue.
Fragment_A :
public class Fragment_A extends Fragment implements View.OnClickListener {
Button btnAdd;
int counter = 0;
Communicator comm;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if(savedInstanceState != null){
counter = savedInstanceState.getInt("counter", 0);
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_a, container, false);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
comm = (Communicator) getActivity();
btnAdd = (Button) getActivity().findViewById(R.id.btnAdd);
btnAdd.setOnClickListener(this);
}
#Override
public void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putInt("counter", counter);
}
#Override
public void onClick(View v) {
counter++;
comm.sendData(counter);
}
}
interface Communicator{
void sendData(int i);
}
=====
Activity :
public class Activity_InterComm extends Activity implements Communicator{
FragmentManager manager;
FragmentTransaction transaction;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_intercomm);
Fragment_A fragment_1 = new Fragment_A();
Fragment_B fragment_2 = new Fragment_B();
manager = getFragmentManager();
transaction = manager.beginTransaction();
transaction.add(R.id.frag_a, fragment_1, "Frag1");
transaction.add(R.id.frag_b, fragment_2, "Frag2");
transaction.commit();
}
#Override
public void sendData(int i) {
manager = getFragmentManager();
Fragment_B fragment_b = (Fragment_B) manager.findFragmentById(R.id.frag_b);
fragment_b.setData("Button has been clicked " + i + " times");
}
}
=====
Fragment_B :
public class Fragment_B extends Fragment {
TextView txtMessage;
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_b, container, false);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
txtMessage = (TextView) getActivity().findViewById(R.id.txtMessage);
}
public void setData(String message){
txtMessage.setText(message);
}
}
activity_intercomm.xml :
<?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">
<!--<fragment
android:id="#+id/frag_a"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:name="android.learning.com.fragintercomm.Fragment_A"/>
<fragment
android:id="#+id/frag_b"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:name="android.learning.com.fragintercomm.Fragment_B"/>-->
<LinearLayout
android:id="#+id/frag_a"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:background="#color/colorAccent"
android:orientation="vertical"/>
<LinearLayout
android:id="#+id/frag_b"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_marginBottom="8dp"
android:layout_weight="1"
android:background="#color/colorPrimaryDark"
android:orientation="vertical"/>
</LinearLayout>
the soluion I found was using getView() instead of getActivity() while initializing the button in Fragment_A. use btnAdd = (Button) getView().findViewById(R.id.btnAdd); instead of btnAdd = (Button) getActivity().findViewById(R.id.btnAdd);.
However, you can't use getView() in Fragment_B. The Textview freezes and, onSaveInstanceStat() doesn't work. Please suggest a solution.
I made an application extending an activity, all worked fine.
To improve the application I changed the activity to Fragment (using onCreateView , onActivityCreated), but now all the images not shown.
I don't get any errors.
I open the Fragments inside the FragmentActivity using FragmentStatePagerAdapter.
Is there something I'm missing ?
Fragment XML:
<RelativeLayout 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:padding="10dp"
>
<ImageView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:minWidth="170dp"
android:maxWidth="170dp"
android:minHeight="170dp"
android:maxHeight="170dp"
app:srcCompat="#drawable/logo_pic"
android:id="#+id/iv_profile_img"
android:layout_below="#+id/relativeview_search_bar"
android:layout_centerHorizontal="true"
android:layout_marginTop="12dp"
android:background="#drawable/circle_image"
/>
</RelativeLayout>
Fragment Class:
public class TempActivity extends Fragment {
private static final String TAG = "SearchCars";
ArrayList<ListUser> userChatItems;
MessagesAdapter mAdapter;
FragmentActivity con;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.activity_listview_users_profiles, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
//con = this.getContext();
con = this.getActivity();
Log.v(TAG, "Initializing ...");
View v = getView();
}
}
PageAdapter:
public class PageAdapter extends FragmentStatePagerAdapter {
public PageAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
switch (position) {
case 0:
return new MyProfileActivity();
default:
break;
}
return null;
}
#Override
public int getCount() {
return 1;
}
}
Main Fragment Activity:
public class MainFragmentActivity extends FragmentActivity{
ViewPager viewpager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main_fragment);
viewpager = (ViewPager) findViewById(R.id.pager);
PageAdapter pageAdapter = new PageAdapter(getSupportFragmentManager());
viewpager.setAdapter(pageAdapter);
}
}
Well I found that if I change to android:src instead of app:srcCompat
all is working fine.
It's probably better to use app:secCompat when extending from AppCompatActivity
But, when I use Fragment it doesn't work any more.
I have a TabLayout and ViewPager to hold and navigate between my fragments (3 of them) and that is working fine however I'm getting confused as to how I interact with each fragment for example button clicks or edit texts. Here is my main activity xml.
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.design.widget.TabLayout
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="#+id/tabLayout"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true"
android:background="#color/colorPrimary"
app:tabMode="fixed"
app:tabGravity="fill" />
<android.support.v4.view.ViewPager
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:id="#+id/viewPager"
android:layout_centerHorizontal="true"
android:layout_below="#+id/tabLayout" />
</RelativeLayout>
This is the activity for it.
public class ActivityMain extends AppCompatActivity {
private String tabTitles[] = new String[] { "contacts", "home", "search" };
TabLayout tabLayout;
ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main_activity);
viewPager = (ViewPager) findViewById(R.id.viewPager);
viewPager.setAdapter(new CustomAdapater(getSupportFragmentManager(),getApplicationContext()));
tabLayout = (TabLayout) findViewById(R.id.tabLayout);
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) {
viewPager.setCurrentItem(tab.getPosition());
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
});
}
private class CustomAdapater extends FragmentPagerAdapter {
private String fragments [] = {"contacts", "home", "search"};
public CustomAdapater(FragmentManager supportFragmentManager, Context applicationContext) {
super(supportFragmentManager);
}
#Override
public Fragment getItem(int position) {
switch (position){
case 0:
return new FragmentContacts();
case 1:
return new FragmentMain();
case 2:
return new FragmentSearch();
default:
return null;
}
}
#Override
public int getCount() {
return fragments.length;
}
#Override
public CharSequence getPageTitle(int position) {
// Generate title based on item position
return tabTitles[position];
}
}
}
And here is a fragment activity.
public class FragmentSearch extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.fragment_search,container,false);
}
}
Now say in my R.layout.fragment_search I had a button just for examples sake, how do I set an onclicklistener for it? Is it within the FragmentSearch or ActivityMain? I've searched around but I'm just getting more confused.
You'd set your onClickListener in the fragment's onCreateView method by doing something like:
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment1, container, false);
myButton = (Button) rootView.findViewById(R.id.buttonId);
myButton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// Perform action on click
}
});
return rootView;
}
Everything is the same regarding the onClickListener, as you can see. The only difference is that you have to inflate to view and use that view to find the appropriate components (e.g. buttons, textviews..)
Now, if you want to communicate between Fragments, you will need to implement more things. The basic way is to use interfaces to be implemented by your activity, so each fragment can call those methods within the activities.
There are also messaging libraries such as Otto and EventBus, they are great by sending stuff between not just fragments, but services also.
The following is layout
test.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<Button android:layout_width="wrap_content" android:layout_height="wrap_content"
android:text="Click"
android:id="#+id/button"
/>
<!-- Framelayout to display Fragments -->
<FrameLayout
android:id="#+id/frame_container"
android:layout_width="match_parent"
android:layout_height="match_parent" />
</LinearLayout>
test_detail.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textAppearance="?android:attr/textAppearanceLarge"
android:text="Hello"
android:id="#+id/textView" android:layout_gravity="center_horizontal"/>
</LinearLayout>
common_view_pager_layout
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v4.view.ViewPager
android:id="#+id/MainViewerPage"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<android.support.v4.view.PagerTabStrip
android:id="#+id/TitlePageTabStrip"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</android.support.v4.view.ViewPager>
</LinearLayout>
The following is my Activity code
public class TestFragmentActivity extends FragmentActivity {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.setContentView(R.layout.test);
Button button = (Button) this.findViewById(R.id.button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction()
.replace(R.id.frame_container, new HomeFragment()).commit();
}
});
}
public class HomeFragment extends Fragment {
private PagerAdapter _adapter;
public HomeFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.common_view_pager_layout, container, false);
this._adapter = new PagerAdapter(TestFragmentActivity.this);
this._adapter.add(new DetailFragment());
ViewPager pager = (ViewPager) view.findViewById(R.id.MainViewerPage);
pager.setAdapter(this._adapter);
return view;
}
}
public class DetailFragment extends Fragment {
public DetailFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.test_detail, container, false);
return rootView;
}
}
public class PagerAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> _fragments;
public PagerAdapter(FragmentActivity activity) {
super(activity.getSupportFragmentManager());
this._fragments = new ArrayList<Fragment>();
}
public void add(Fragment fragment) {
this._fragments.add(fragment);
}
#Override
public Fragment getItem(int position) {
return this._fragments.get(position);
}
#Override
public CharSequence getPageTitle(int position) {
return "Test";
}
#Override
public int getCount() {
return 1;
}
}
}
When I click a button the fragment in ViewPager was display
But when I click the button again the fragment disappear
Please help me.
try using this:
in the constructor of your adapter change this :
public class MyPagerAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> _fragments;
public MyPagerAdapter(FragmentManager activity) {
super(activity);
this._fragments = new ArrayList<Fragment>();
}
public void add(Fragment fragment) {
this._fragments.add(fragment);
}
#Override
public Fragment getItem(int position) {
return this._fragments.get(position);
}
#Override
public CharSequence getPageTitle(int position) {
return "Test";
}
#Override
public int getCount() {
return 1;
}
}
and when you want to create the adapter send getChildFragmentManager() to its constructor
public class HomeFragment extends Fragment {
private MyPagerAdapter _adapter;
public HomeFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.common_view_pager_layout, container, false);
ViewPager pager = (ViewPager) view.findViewById(R.id.MainViewerPage);
this._adapter = new MyPagerAdapter(getChildFragmentManager());
this._adapter.add(new DetailFragment());
pager.setAdapter(this._adapter);
return view;
}
}
I test it and it works, any problem comment it.
Good Luck!
In your Fragment class, in the onCreate() method, you have to call setRetainInstance(true) like this:
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
This tells the FragmentManager to keep your fragments on reloads.
In addition, check your manifest file doesn't have any
android:screenOrientation
config changes where you are basically saying you will handle reloads due to config changes yourself.
In PagerFragment 's onResume() add this:
#Override
public void onResume() {
super.onResume();
for (Fragment fragment : getFragmentManager().getFragments()) {
if (fragment instanceof Tab1Fragment || fragment instanceof Tab2Fragment) {
FragmentTransaction ft = getFragmentManager().beginTransaction();
ft.detach(fragment);
ft.attach(fragment);
ft.commit();
}
}
}
Try to add this lines in your code:
public int getItemPosition(Object object) {
return POSITION_NONE;
}
and Add the below lines
pager.setOnPageChangeListener(new OnPageChangeListener() {
#Override
public void onPageSelected(int position) {
... anything you may need to do to handle pager state ...
adapter.notifyDataSetChanged(); //this line will force all pages to be loaded fresh when changing between fragments
}
Under
pager.setAdapter(adapter);
Hope this may help you!
Ensure you pass the adapter instance the child fragment manager, not the fragment manager.
Like this:
this._adapter = new PagerAdapter(getChildFragmentManager());
I'm trying to use the Fragment, ViewPager & co. from the Android support library v4. Fragments seem to scroll when I listen to page change events from the pager but the content is not visible. What I basically have is:
A FragmentActivity:
public class MyActivity extends FragmentActivity
{
#Override
public void onCreate(Bundle savedInstanceState)
{
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
FragmentPagerAdapter fpa = new MyPagerAdapter(this, createFragments());
ViewPager vp = (ViewPager) findViewById(R.id.pager);
vp.setAdapter(fpa);
}
private List<Fragment> createFragments() {
List<Fragment> list = new ArrayList<Fragment>();
list.add(Fragment.instantiate(this, First.class.getName()));
list.add(Fragment.instantiate(this, Second.class.getName()));
list.add(Fragment.instantiate(this, Third.class.getName()));
return list;
}
#Override
protected void onSaveInstanceState(Bundle outState) {
}
A FragmentPagerAdapter:
public class MyPagerAdapter extends FragmentPagerAdapter {
private List<Fragment> fragments;
public MyPagerAdapter(FragmentActivity activity, List<Fragment> fragments) {
super(activity.getSupportFragmentManager());
this.fragments = fragments;
}
#Override
public Fragment getItem(int i) {
return fragments.get(i);
}
#Override
public int getCount() {
return fragments.size();
}
#Override
public boolean isViewFromObject(View view, Object o) {
return view.equals(o);
}
}
And three Fragments that look like this:
public class First extends Fragment {
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
return inflater.inflate(R.layout.first, container, false);
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
}
}
And they have layout like these:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent">
<TextView android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:text="First Fragment"
android:id="#+id/firstText"/>
</LinearLayout>
I originally forgot to add the main layout, here it comes:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<android.support.v4.view.ViewPager
android:id="#+id/pager"
android:layout_height="wrap_content"
android:layout_weight="1"
android:layout_width="fill_parent"/>
</LinearLayout>
I would appreciate if someone can tell me what I am doing wrong.
This is because you have overridden isViewFromObject in MyPagerAdapter.
FragmentPagerAdapter handles isViewFromObject, so you shouldnt override it.
As with me, I reckon most visitors to this post started with a basic PagerAdapter, then realised they needed to page fragments and changed their base class without realising the consequences. Unfortunate, but I couldn't criticise the Android team for this.
Ya correct as Ian Newson told, just remove isViewFromObject overrided method from your code
#Override
public boolean isViewFromObject(View view, Object object) {
return false;
}