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Bundle value in fragment becomes null

I have main activity where I am connecting Api to recycler view. On recycler view item click, I need to open fragment and then use viewpager to slide between pages. My problem is when i click on any item in recview, it always opens the first page. That is because my position that is passed becomes null when fragment is created. Anyone got any solution?
public class ArticleFragment extends Fragment {
private TextView tvTitle, tvDescription;
private ImageView ivSlika;
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
private NewsList mNewsList=new NewsList();
private int mPosition;
public ArticleFragment() { }
public static ArticleFragment newInstance(NewsList param1, int param2) {
ArticleFragment fragment = new ArticleFragment();
Bundle args = new Bundle();
args.putSerializable(ARG_PARAM1, param1);
args.putInt(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mNewsList = (NewsList) getArguments().getSerializable(ARG_PARAM1);
mPosition = getArguments().getInt(ARG_PARAM2);
Log.d(TAG, "onCreate: "+ getArguments());
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_article, container, false);
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
tvTitle=view.findViewById(R.id.tvNaslov);
tvDescription=view.findViewById(R.id.tv_description);
ivSlika=view.findViewById(R.id.iv_article);
//setParameters((NewsList) getArguments().getSerializable(ARG_PARAM1), getArguments().getInt(ARG_PARAM2));
setParameters(mNewsList, mPosition);
}
public void setParameters( NewsList nl, int position){
//nl=new NewsList();
//nl=articleActivity.getMyList();
//List<News> newsList=nl.getNewsList();
/*ArticleActivity articleActivity=(ArticleActivity) getActivity();
position=articleActivity.getPosition();
tvTitle.setText(articleActivity.getMyTitle(position));
tvDescription.setText(articleActivity.getMyDescription(position));
Picasso.get().load(articleActivity.getMyImage(position)).fit().into(ivSlika);*/
tvTitle.setText(nl.getNewsList().get(position).getTitle());
tvDescription.setText(nl.getNewsList().get(position).getDescription());
Picasso.get().load(nl.getNewsList().get(position).getImageUrl()).fit().into(ivSlika);
}
}
public class ArticleActivity extends AppCompatActivity {
private int position;
private NewsList newsList;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_article);
initViews();
newsList= (NewsList)getIntent().getSerializableExtra("List");
position=getIntent().getIntExtra("Position",5);
//getSupportFragmentManager().beginTransaction().add(R.id.viewPager, ArticleFragment.newInstance(newsList, position)).commit();
setUpPager();
}
public String getMyTitle(int position){
return newsList.getNewsList().get(position).getTitle();
}
public String getMyDescription(int position){
return newsList.getNewsList().get(position).getDescription();
}
public String getMyImage(int position){
return newsList.getNewsList().get(position).getImageUrl();
}
private void initViews(){
viewPager= findViewById(R.id.viewPager);
}
private void setUpPager(){
PagerAdapter pagerAdapter=new ScreenSlidePagerAdapter(getSupportFragmentManager(), newsList, position);
viewPager.setAdapter(pagerAdapter);
}
public NewsList getMyList(){
return newsList;
}
public int getPosition() {
return position;
}
}
public class ScreenSlidePagerAdapter extends FragmentStatePagerAdapter {
private NewsList newsList;
private int mPosition;
private static final int NUM_PAGES =10;
public ScreenSlidePagerAdapter(FragmentManager fragmentManager, NewsList newsList, int position){
super(fragmentManager);
this.newsList=newsList;
this.mPosition=position;
}
public Fragment getItem(int position) {
switch (position){
case 0:
return ArticleFragment.newInstance(newsList, 0);
case 1:
return ArticleFragment.newInstance(newsList, 1);
case 2:
return ArticleFragment.newInstance(newsList, 2);
case 3:
return ArticleFragment.newInstance(newsList, 3);
case 4:
return ArticleFragment.newInstance(newsList, 4);
case 5:
return ArticleFragment.newInstance(newsList, 5);
case 6:
return ArticleFragment.newInstance(newsList, 6);
case 7:
return ArticleFragment.newInstance(newsList, 7);
case 8:
return ArticleFragment.newInstance(newsList, 8);
case 9:
return ArticleFragment.newInstance(newsList, 9);
default:
return ArticleFragment.newInstance(newsList, position);
}
}
#Override
public int getCount() {
return NUM_PAGES;
}
#Override
public int getItemPosition(#NonNull Object object) {
return super.getItemPosition(object);
}
}
public class RecyclerAdapter extends RecyclerView.Adapter<NameViewHolder> {
private List<News> dataList = new ArrayList<>();
private NameClickListener clickListener;
public RecyclerAdapter(NameClickListener clickListener) {
this.clickListener = clickListener;
}
#NonNull
#Override
public NameViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View cellView = LayoutInflater.from(parent.getContext()).inflate(R.layout.row, parent, false);
return new NameViewHolder(cellView, clickListener);
}
#Override
public void onBindViewHolder(#NonNull NameViewHolder holder, int position) {
holder.setName(dataList.get(position));
}
#Override
public int getItemCount() {
return dataList.size();
}
public void addData(List<News> data){
this.dataList.clear();
this.dataList.addAll(data);
notifyDataSetChanged();
}
public void addNewCell(News news, int position){
if(dataList.size() >= position){
dataList.add(position,news);
notifyItemInserted(position);
}
}
}
public class MainActivity extends AppCompatActivity implements NameClickListener{
private Call<Root> apiCall;
private List<News> newsList;
RecyclerAdapter adapter;
RecyclerView recyclerView;
NewsList ListofNews;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
setUpApiCall();
setUpRecycler();
}
private void setUpApiCall(){
apiCall=NetworkUtils.getApiInterface().getNews();
apiCall.enqueue(new Callback<Root>() {
#Override
public void onResponse(Call<Root> call, Response<Root> response) {
if(response.isSuccessful() && response.body()!=null){
/*newsList=new ArrayList<News>();
for(int i=0;i<response.body().articles.size();i++){
newsList.add(response.body().articles.get(i));
}
setData(newsList);
}*/
ListofNews=new NewsList();
ListofNews.setNewsList(response.body().articles);
setData(ListofNews.getNewsList());
}}
#Override
public void onFailure(Call<Root> call, Throwable t) {
AlertDialog alertDialog=new AlertDialog.Builder(MainActivity.this).setTitle("Error").setMessage("Something went wrong").setPositiveButton("yes", new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
}).show();
}
});
}
private void setUpRecycler(){
recyclerView = (RecyclerView) findViewById(R.id.recView);
// Create adapter passing in the sample user data
adapter = new RecyclerAdapter(this);
// Attach the adapter to the recyclerview to populate items
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setAdapter(adapter);
}
private void setData(List<News> newsList){
adapter.addData(newsList);
}
public void onNameClick(int position){
Intent intent=new Intent(MainActivity.this, ArticleActivity.class);
intent.putExtra("List", ListofNews);
intent.putExtra("Position", position);
startActivity(intent);
}}

How to create an custom alertDialog from a tabbed fragment?

Problem:
I'm trying to open a custom dialog after pressing a button in my tabbed fragment.
It's seems like my MainActivity activity is sent to the dialog while i want my tabbed fragment(GroupFragment) to be sent so i can change the editText(for now) in this fragment.
Code:
public class GroupFragment extends Fragment implements AddGroupDialog.AddGroupDialogListener {
private Button addGroupButton;
private TextView textViewNoGroups;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_group, container, false);
addGroupButton = view.findViewById(R.id.addGroupButton);
textViewNoGroups = view.findViewById(R.id.textViewNoGroups);
addGroupButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
addNewGroupDialog();
}
});
scaleAnimation(addGroupButton);
return view;
}
private void scaleAnimation(View v){
Animator scale = ObjectAnimator.ofPropertyValuesHolder(v,
PropertyValuesHolder.ofFloat(View.SCALE_X, 0, 1.2f, 1),
PropertyValuesHolder.ofFloat(View.SCALE_Y, 0, 1.2f, 1)
);
scale.setDuration(600);
scale.start();
}
private void addNewGroupDialog(){
AddGroupDialog dialog = new AddGroupDialog();
assert getFragmentManager() != null;
dialog.show(getFragmentManager(), "add new group dialog");
}
#Override
public void applyString(String groupName) {
textViewNoGroups.setText(groupName);
}
}
public class AddGroupDialog extends AppCompatDialogFragment {
private EditText editTextGroupName;
private AddGroupDialogListener listener;
#NonNull
#Override
public Dialog onCreateDialog(#Nullable Bundle savedInstanceState) {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
LayoutInflater inflater = getActivity().getLayoutInflater();
View view = inflater.inflate(R.layout.layout_add_new_group_dialog, null);
builder.setView(view)
.setTitle("")
.setPositiveButton(R.string.confirm, new DialogInterface.OnClickListener() {
#Override
public void onClick(DialogInterface dialogInterface, int i) {
String groupName = editTextGroupName.getText().toString();
listener.applyString(groupName);
}
});
editTextGroupName = view.findViewById(R.id.editTextGroupName);
return builder.create();
}
#Override
public void onAttach(#NonNull Context context) {
super.onAttach(context);
try {
listener = (AddGroupDialogListener) context;
} catch (ClassCastException e){
throw new ClassCastException(context.toString() +
"Must implement AddGroupDialogListener");
}
}
public interface AddGroupDialogListener{
void applyString(String groupName);
}
}
public class MainActivity extends AppCompatActivity{
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionsPagerAdapter = new SectionsPagerAdapter(this, getSupportFragmentManager());
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionsPagerAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}
}
public class SectionsPagerAdapter extends FragmentPagerAdapter {
#StringRes
private static final int[] TAB_TITLES = new int[]{R.string.tab_text_1, R.string.tab_text_2, R.string.tab_text_3};
private final Context mContext;
public SectionsPagerAdapter(Context context, FragmentManager fm) {
super(fm);
mContext = context;
}
#Override
public Fragment getItem(int position) {
Fragment fragment = null;
switch (position){
case 0:
fragment = new GroupFragment();
break;
case 1:
fragment = new AttendanceFragment();
break;
case 2:
fragment = new StatisticsFragment();
break;
}
return fragment;
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return mContext.getResources().getString(TAB_TITLES[position]);
}
#Override
public int getCount() {
return TAB_TITLES.length;
}
}
Error:
java.lang.ClassCastException: com.example.attendencetaker.MainActivity#26602bcMust implement AddGroupDialogListener
I hope my explanation of the problem is clear. Thank you!

Make the activity implement your interfaces and so on and then pass all data to the fragment with an method on the fragment. You will need an reference to actual Fragment that is displayed.
In your fragment add a method similar to this:
public void updateData(String data) {
editText.setText(data);
}
And in the override method of the interface in your activity to this:
#Override
public void update(String data) {
fragment.updateData(data);
}
Update
Use this Adapter instead:
public class SectionTabAdapter extends FragmentPagerAdapter {
private ArrayList<Fragment> fragments = new ArrayList<>();
private ArrayList<String> titles = new ArrayList<>();
public SectionTabAdapter(#NonNull FragmentManager fm, int behavior) {
super(fm, behavior);
}
public void addFragment(Fragment fragment, String title) {
fragments.add(fragment);
titles.add(title);
}
#NonNull
#Override
public Fragment getItem(int position) {
return fragments.get(position);
}
#Override
public int getCount() {
return fragments.size();
}
#Nullable
#Override
public CharSequence getPageTitle(int position) {
return titles.get(position);
}
}
In your activity then do this:
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
SectionsPagerAdapter sectionTabAdapter = new SectionTabAdapter(this, getSupportFragmentManager());
Fragment groupFragment = new GroupFragment();
Fragment attendanceFragment = new AttendanceFragment();
Fragment statisticsFragment = new StatisticsFragment();
sectionTabAdapter.addFragment(groupFragment, context.getString(R.string.title_1);
sectionTabAdapter.addFragment(attendanceFragment, context.getString(R.string.title_2);
sectionTabAdapter.addFragment(statisticsFragment, context.getString(R.string.title_3);
ViewPager viewPager = findViewById(R.id.view_pager);
viewPager.setAdapter(sectionTabAdapter);
TabLayout tabs = findViewById(R.id.tabs);
tabs.setupWithViewPager(viewPager);
}

FragmentStateAdapter onRefreshListener

how can i implement a onRefreshListener in fragments if i am using ViewPager (ViewPager 2) with FragmentStateAdapter.
I found only examples with FragmentPageAdapter.
the other code works so far, i mean swiping between fragments an displaying a list of strings.
Just the refresh (pull from top to bottom) don't work.
I just see the refresh symbol short and then it dissapears.
In the debugger the onRefresh functions will not be called, after a refresh action.
This is my Code:
main activity
viewPager = findViewById(R.id.view_pager);
tabLayout = findViewById(R.id.tabs);
viewPager.setAdapter(new ViewPagerAdapter(this, dataManager));
new TabLayoutMediator(tabLayout, viewPager,
new TabLayoutMediator.TabConfigurationStrategy() {
#Override public void onConfigureTab(#NonNull TabLayout.Tab tab, int position) {
tab.setText("Tab " + (position + 1));
}
}).attach();
viewpager
public class ViewPagerAdapter extends FragmentStateAdapter {
private static final int CARD_ITEM_SIZE = 3;
private DataManager dataManager;
public ViewPagerAdapter(#NonNull FragmentActivity fragmentActivity, DataManager dataManager) {
super(fragmentActivity);
this.dataManager = dataManager;
}
#NonNull #Override public Fragment createFragment(int position) {
Fragment fragment = null;
if (position == 0)
{
fragment = new FragmentA();
Bundle bundle = new Bundle(2);
bundle.putString("TOKEN", dataManager.getToken());
bundle.putString("SERVER_URL", dataManager.getServerURL());
fragment.setArguments(bundle);
}
else if (position == 1)
{
fragment = new FragmentB();
}
else if (position == 2)
{
fragment = new FragmentC();
}
return fragment;
}
#Override public int getItemCount() {
return CARD_ITEM_SIZE;
}
fragment
public class FragmentA extends Fragment implements SwipeRefreshLayout.OnRefreshListener{
private RecyclerView recyclerView;
private SwipeRefreshLayout swipeLayout;
private Bundle bundle;
private ListView mainListView;
private LibrariesAdapter listAdapter;
private LibraryDataManager libraryDataManager;
private RecyclerViewAdapter adapter;
private GetLibrariesTask getLibrariesTask;
private String token;
private String serverUrl;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
bundle = getArguments();
if (bundle != null) {
token = bundle.getString("TOKEN");
serverUrl = bundle.getString("SERVER_URL");
libraryDataManager = new LibraryDataManager(token, serverUrl);
} else {
// ToDo show error or something else
}
}
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment, container, false);
swipeLayout = rootView.findViewById(R.id.swiperefresh);
getLibrariesTask = new GetLibrariesTask();
getLibrariesTask.execute();
return rootView;
}
#Override
public void onViewCreated(View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
mainListView = view.findViewById(android.R.id.list);
ArrayList<Library> librariesList = new ArrayList<>();
listAdapter = new LibrariesAdapter(getActivity(), librariesList);
mainListView.setAdapter(listAdapter);
swipeLayout.setOnRefreshListener(this);
swipeLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
#Override
public void onRefresh() {
getLibrariesTask = new GetLibrariesTask();
getLibrariesTask.execute();
}
});
}
private class GetLibrariesTask extends AsyncTask<Void, Void, List<Library>> {
#Override
protected List<Library> doInBackground(Void... args) {
List<Library> libraries = libraryDataManager.getLibraries();
return libraries;
}
#Override
protected void onPostExecute(List<Library> libraries) {
listAdapter.clear();
listAdapter.addAll(libraries);
listAdapter.notifyDataSetChanged();
Logger.debug("on refresh2");
// swipeLayout.setRefreshing(false);
}
}
}

How to use viewPager and Fragments for passing multiple data

Im trying to pass string data together with images.
Why when running this code I get only image 'nature4' shown but there is no 'nature2' image and strings 'Fragment1' etc..
public class MainActivity extends AppCompatActivity {
private ViewPager viewPager;
private ArrayList<String> strs;
private FragmentPagerAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Log.i("x","onCreateActivity");
strs = new ArrayList<String>();
strs.add("Fragment 1");
strs.add("Fragment 2");
strs.add("Fragment 3");
strs.add("Fragment 4");
strs.add("Fragment 5");
viewPager = (ViewPager) findViewById(R.id.pager);
adapter = new FragmentPagerAdapter(getSupportFragmentManager(), strs);
viewPager.setAdapter(adapter);
}
public class FragmentPagerAdapter extends FragmentStatePagerAdapter {
private ArrayList<String> itemData;
public FragmentPagerAdapter(FragmentManager fm, ArrayList<String> itemData) {
super(fm);
this.itemData = itemData;
}
#Override
public int getCount()
{
return itemData.size();
}
#Override
public void destroyItem(ViewGroup container, int position, Object object) {
super.destroyItem(container, position, object);
Log.i("x","destroyItem");
}
#Override
public Fragment getItem(int position){
Log.i("x","getItem");
// pass data to fragment
Fragment1 f = Fragment1.newInstance(itemData.get(position));
return f;
}
}
}
And Fragment.class
public class Fragment1 extends Fragment {
public Fragment1(){}
String stringValue;
private int [] images = {R.drawable.nature2,R.drawable.nature4};
public static Fragment1 newInstance(String str)
{
Fragment1 slider=new Fragment1();
Bundle b=new Bundle();
b.putString("stringValue", str);
slider.setArguments(b);
return slider;
}
TextView textView;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
Log.i("x","onCreateViewFragment");
View view = inflater.inflate(R.layout.fragment1, container, false);
textView = (TextView) view.findViewById(R.id.textView);
ImageView photo = (ImageView) view.findViewById(image);
photo.setImageResource(images[1]);
return view;
}
#Override
public void onActivityCreated(Bundle savedInstanceState) {
Log.i("x","onActivityCreatedFragment");
super.onActivityCreated(savedInstanceState);
stringValue = getArguments().getString("stringValue");
textView.setText(stringValue);
}
#Override
public void onCreate(Bundle savedInstanceState) {
Log.i("x","onCreateFragment");
super.onCreate(savedInstanceState);
}
}

I think you need to make your question clear. If you want to pass String stringValue and in imageResId from Activity to Fragment, try the following codes.
public static Fragment1 newInstance(String str, int imageResId) {
Fragment1 slider = new Fragment1();
Bundle b=new Bundle();
b.putString("stringValue", str);
b.putInt("image_resid", imageResId);
slider.setArguments(b);
return slider;
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
stringValue = getArguments().getString("stringValue");
imageResId = getArguments().getIn("image_resid");
}
FragmentPagerAdapter:
public class FragmentPagerAdapter extends FragmentStatePagerAdapter {
...
#Override
public Fragment getItem(int position){
Fragment fragment;
String str = itemData.get(position);
int resId;
if (position == 0) {
resId = R.drawable.nature2;
} else if (position == 1) {
resId = R.drawable.nature4;
}
fragment = Fragment1.newInstance(str, resId);
...
return fragment;
}
}

ChildFragmentManager java.lang.IllegalStateException: Activity has been destroyed

I have tried to add a fragment inside another fragment inside viewpager using getChildFragmentManager(). I got following error,
java.lang.IllegalStateException: Activity has been destroyed
at android.support.v4.app.FragmentManagerImpl.enqueueAction(FragmentManager.java:1549)
at android.support.v4.app.BackStackRecord.commitInternal(BackStackRecord.java:654)
at android.support.v4.app.BackStackRecord.commitAllowingStateLoss(BackStackRecord.java:625)
at com.lakeba.gameon.userprofile.UserProfileContainerFragment.replaceFragment(UserProfileContainerFragment.java:72)
And I tried this workaround but still getting same error.
UserProfileContainerFragment.java
public class UserProfileContainerFragment extends CustomFragment {
private View rootView;
private Fragment fragment1;
public UserProfileContainerFragment() {
// Required empty public constructor
}
#Override
public void onCreate(#Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setRetainInstance(true);
}
public static UserProfileContainerFragment newInstance() {
UserProfileContainerFragment fragment = new UserProfileContainerFragment();
return fragment;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
rootView = inflater.inflate(R.layout.fragment_user_profile_container, container, false);
if(savedInstanceState == null) {
UserProfileFragment userProfileFragment = UserProfileFragment.newInstance();
getChildFragmentManager().beginTransaction()
.replace(R.id.user_profile_container, userProfileFragment)
.commitAllowingStateLoss();
}
return rootView;
}
/*#Override
public void onSaveInstanceState(Bundle outState) {
//super.onSaveInstanceState(outState);
}*/
public void replaceFragment(Fragment fragment, boolean addToBackStack){
fragment1 = fragment;
if(addToBackStack){
/*getChildFragmentManager().beginTransaction()
.replace(R.id.user_profile_container, fragment)
.addToBackStack(null)
.commit();*/
getChildFragmentManager().beginTransaction()
.replace(R.id.user_profile_container, fragment)
.addToBackStack(null)
.commit();
//.commitAllowingStateLoss();
}
else{
getChildFragmentManager().beginTransaction()
.replace(R.id.user_profile_container, fragment)
.commit();
//.commitAllowingStateLoss();
}
}
#Override
public void onDetach() {
super.onDetach();
try {
Field childFragmentManager = Fragment.class.getDeclaredField("mChildFragmentManager");
childFragmentManager.setAccessible(true);
childFragmentManager.set(this, null);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
}
HomeMapActivity.java
public class HomeMapActivity extends AppCompatActivity implements UserProfileFragment.OnUserProfileFragmentListener{
private Toolbar homeToolbar;
private ViewPager homeViewPager;
private TabLayout homeTabLayout;
private UserProfileContainerFragment userProfileContainerFragment;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_home_map);
/*homeToolbar = (Toolbar) findViewById(R.id.home_toolbar);
setSupportActionBar(homeToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);*/
homeViewPager = (ViewPager) findViewById(R.id.home_view_pager);
HomeViewPagerAdapter homeViewPagerAdapter = new HomeViewPagerAdapter(getSupportFragmentManager());
userProfileContainerFragment = new UserProfileContainerFragment();
homeViewPagerAdapter.addFragment(new UserProfileContainerFragment(),"Profile");
homeViewPager.setAdapter(homeViewPagerAdapter);
homeTabLayout = (TabLayout) findViewById(R.id.home_tabs);
homeTabLayout.setupWithViewPager(homeViewPager);
setTabIcons(homeTabLayout);
homeTabLayout.addOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
#Override
public void onTabSelected(TabLayout.Tab tab) {
int tabPosition = tab.getPosition();
tab.setIcon(tabIconsArrayActivated[tabPosition]);
}
#Override
public void onTabUnselected(TabLayout.Tab tab) {
int tabPosition = tab.getPosition();
tab.setIcon(tabIconsArray[tabPosition]);
}
#Override
public void onTabReselected(TabLayout.Tab tab) {
int tabPosition = tab.getPosition();
tab.setIcon(tabIconsArrayActivated[tabPosition]);
}
});
homeTabLayout.getTabAt(1).select();
}
private void setTabIcons(TabLayout homeTabLayout) {
homeTabLayout.getTabAt(0).setIcon(tabIconsArray[0]);
homeTabLayout.getTabAt(1).setIcon(tabIconsArray[1]);
homeTabLayout.getTabAt(2).setIcon(tabIconsArray[2]);
homeTabLayout.getTabAt(3).setIcon(tabIconsArray[3]);
}
#Override
public void onUserProfileEditButtonClicked() {
userProfileContainerFragment.replaceFragment(EditUserProfileFragment.newInstance(),true);
}
private class HomeViewPagerAdapter extends FragmentStatePagerAdapter{
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public HomeViewPagerAdapter(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);
return null;
}
public void addFragment(Fragment fragment,String title){
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
}
}

If you look at the code in your onCreate() method you'll see the lines:
userProfileContainerFragment = new UserProfileContainerFragment();
homeViewPagerAdapter.addFragment(new UserProfileContainerFragment(),"Profile");
You first initialize the userprofileContainerFragment field with a new instance of UserProfileContainerFragment and then right below you create a new instance of UserProfileContainerFragment to be used in the ViewPager(you can easily observe this by placing a log statement in the constructor of UserProfileContainerFragment...you'll see two instances being created). Later in your code you try to use the field userProfileContainerFragment which will lead to a failure as that instance of UserProfileContainerFragment is not attached to the activity at all(this isn't the fragment used by the ViewPager).
Your code should look like below, to maintain the proper reference and not create detached fragments:
userProfileContainerFragment = new UserProfileContainerFragment();
homeViewPagerAdapter.addFragment(userProfileContainerFragment,"Profile");