Populating a recyclerView within a fragment of a Tabbed application

Populating a recyclerView within a fragment of a Tabbed application - android

I'm new to android studio and I'm trying to make a Tabbed Application with a Menu Tab in the Middle,
I'm using RecyclerView in my fragment, as explained in this tutorial
I've done everything the way it should be, but at the "Binding the Adapter to the RecyclerView" Step I encountered a problem,
the findViewById(R.id.my_recycler_id); returns null
Here's the Code:
Main activity
public class MainActivity extends AppCompatActivity {
private SectionsPagerAdapter mSectionsPagerAdapter;
private ViewPager mViewPager;
ArrayList<DummyItem> dummies;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
RecyclerView rvDummies =(RecyclerView) findViewById(R.id.listdummies);
// Initialize contacts
dummies = DummyItem.createDummiesList(20);
// Create adapter passing in the sample user data
MyItemRecyclerViewAdapter adapter = new MyItemRecyclerViewAdapter(dummies, this);
//Log.d("D",fragment.toString());
// Attach the adapter to the recyclerview to populate items
rvDummies.setAdapter(adapter);
// That's all!
}
... (some other code)
}
My fragement
public class ItemFragment extends Fragment {
// TODO: Customize parameter argument names
private static final String ARG_COLUMN_COUNT = "column-count";
// TODO: Customize parameters
private int mColumnCount = 1;
private OnListFragmentInteractionListener mListener;
RecyclerView fragmentchildRecyclerView;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public ItemFragment() {
}
// TODO: Customize parameter initialization
#SuppressWarnings("unused")
public static ItemFragment newInstance(int columnCount) {
ItemFragment fragment = new ItemFragment();
Bundle args = new Bundle();
args.putInt(ARG_COLUMN_COUNT, columnCount);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mColumnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_item_list, container, false);
fragmentchildRecyclerView = (RecyclerView) view.findViewById(R.id.listdummies);
// Set the adapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
RecyclerView recyclerView = (RecyclerView) view;
recyclerView.setLayoutManager(new LinearLayoutManager(context));
recyclerView.setAdapter(new MyItemRecyclerViewAdapter(DummyContent.ITEMS, context));
}
return view;
}
public RecyclerView getRecyclerView(){
return fragmentchildRecyclerView;
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnListFragmentInteractionListener) {
mListener = (OnListFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnListFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnListFragmentInteractionListener {
// TODO: Update argument type and name
void onListFragmentInteraction(DummyItem item);
}
}
Dummy item
public static class DummyItem {
public final String id;
public final String content;
public final String details;
public DummyItem(String id, String content, String details) {
this.id = id;
this.content = content;
this.details = details;
}
#Override
public String toString() {
return content;
}
public static ArrayList<DummyItem> createDummiesList(int numDummies){
ArrayList<DummyItem> dummies = new ArrayList<DummyItem>();
for (int i = 1; i <= numDummies; i++) {
dummies.add(new DummyItem("id "+numDummies,"title "+numDummies,"description "+numDummies));
}
return dummies;
}
}
I searched a lot and I've found that it may be calling the findViewByID before it's created, and others say that the fragment should have a function that returns the recyclerView so i can access it...
Any suggestions would be helpful.

You cannot reference a component in an activity when the component lies in the Fragment. Instead, add your
RecyclerView rvDummies = (RecyclerView) view.findViewById(R.id.listdummies);
in the Fragment's OnCreateView method and set the adapter there. Here the view object will be the layout your Fragment might be inflating.
Reason to do so: Since the Fragment will have a separate layout, the components included in it must be referenced within the Fragment as child to the view (Layout) inflated by the Fragment.

Related

Android TabLayout with ViewPager duplicates fragment contents when rotating

My app has a tablayout with a view pager. Each page has a fragment. There are 4 different fragments, three of them are basically the same for now (I'm in the development phase right now). One of them has a RecyclerView with a basic list.
I am implementing the Two-pane template in the fragment with the RecyclerView.
Everything seems to be works]ing well. While I move across the tabs the fragments are loaded fine.
But, when I rotate the device and tap on the first tab, and then go back to the one with the recyclerview, I can see the previous intance below. See attached images.
I decided to use static final instances of the fragments in the page adapter and in the recyclerview fragment.
How can I get rid of this problem?
Thanks in advance stackers!
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TabLayout tabLayout = findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.icon1).setText(R.string.dashboard));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.icon2).setText(R.string.fragment2));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.icon3).setText(R.string.fragmentDualPane));
tabLayout.addTab(tabLayout.newTab().setIcon(R.drawable.icon4).setText(R.string.frag4));
final ViewPager viewPager = findViewById(R.id.pager);
final PagerAdapter pageAdapter = new TabPagerAdapter(getSupportFragmentManager());
viewPager.setAdapter(pageAdapter);
tabLayout.setupWithViewPager(viewPager);
} // protected void onCreate
} // public class MainActivity
TabPagerAdapter has static final intances of the fragments
public class TabPagerAdapter extends FragmentPagerAdapter {
static final Fragment tabs[] = {new DashboardFragment(),
new Fragment2(),
new ExpensesFragment(),
new Fragment4()
};
public TabPagerAdapter(#NonNull FragmentManager fm) {
super(fm, FragmentPagerAdapter.BEHAVIOR_RESUME_ONLY_CURRENT_FRAGMENT);
} // public TabPagerAdapter
#NonNull
#Override
public Fragment getItem(int position) {
if (position<tabs.length)
return tabs[position];
else
return null;
} // public Fragment getItem
#Override
public int getCount() {
return this.tabs.length;
} // public int getCount
} // class TabPagerAdapter
General fragment template for dashboard, fragment2, and fragment4
public class DashboardFragment extends Fragment {
public DashboardFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
} // onCreate
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
return inflater.inflate(R.layout.fragment_dashboard, container, false);
}
}
This is the code for the fragment with the dual pane. Look that it uses the OnItemSelected implementation of fragments communications.
This fragment loads another fragment with the recyclerview.
public class ExpensesFragment extends Fragment
implements IOnItemSelected {
#Override
public void onAccountSelected(Account item) {
System.out.println("Clicking on " + item.getTitle() + ", and isTwoPane=" + isTwoPane);
} // public void onAccountSelected
public static final String TAG="Expenses Fragment";
private boolean isTwoPane = false; // Let's assume we're on a phone
private FragmentManager fragmentManager;
private View fragmentView = null;
public ExpensesFragment() {
// Required empty public constructor
} // ExpensesFragment()
public static final ExpensesListFragment lListFragment = new ExpensesListFragment();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
} // onCreate
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
fragmentView = inflater.inflate(R.layout.fragment_expenses, container, false);
isTwoPane = fragmentView.findViewById(R.id.expensesDetailContainer) != null;
fragmentManager = getChildFragmentManager();
if (savedInstanceState==null) {
if ( !lListFragment.isAdded() ) {
fragmentManager.
beginTransaction().
add(R.id.expensesListContainer,lListFragment).
commit();
} // if ( !lListFragment.isAdded() )
} // if (savedInstanceState==null)
if ( isTwoPane ) {
fragmentManager.
beginTransaction().
replace(R.id.expensesDetailContainer,new EmptyFragment()).
commit();
} // if ( isTwoPane )
return fragmentView;
} // onCreateView
} // ExpensesFragment
And this is the fragment with the recyclerview:
public class ExpensesListFragment extends Fragment {
private IOnItemSelected mCallback;
private RecyclerView rv;
private RecyclerView.LayoutManager rvlm;
private RecyclerAdapterAccounts rva;
public ExpensesListFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mCallback = (IOnItemSelected)getParentFragment();
} // onCreate
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View fragmentView = inflater.inflate(R.layout.fragment_expenses_list, container, false);
if ( isVisible() ) return fragmentView;
FragmentManager fragmentManager = getChildFragmentManager();
// Setting the recyclerview environment
rv = fragmentView.findViewById(R.id.expensesRV); // recycler view
rvlm = new LinearLayoutManager(getActivity());
rv.setLayoutManager(rvlm);
rva = new RecyclerAdapterAccounts();
rva.setCallBackFunction(mCallback);
rv.setAdapter(rva);
// Setting the floating action button and snackbar
FloatingActionButton fab = fragmentView.findViewById(R.id.fabAdd);
fab.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Snackbar.make(view, "Load a Create Item frag", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
return fragmentView;
} // onCreateView
} // public class ExpensesListFragment
The RecyclerAdapterAccounts creates a generic set of data:
public class RecyclerAdapterAccounts extends
RecyclerView.Adapter<RecyclerAdapterAccounts.ViewHolderAccounts> {
private IOnItemSelected callBackFunction;
public IOnItemSelected getCallBackFunction() {return callBackFunction;}
public void setCallBackFunction(IOnItemSelected callBackFunction) {this.callBackFunction = callBackFunction;}
class ViewHolderAccounts extends RecyclerView.ViewHolder {
ImageView icon, isRepeating, isAlert;
TextView title, total;
public Account getAccount() {return account;}
public void setAccount(Account account) {this.account = account;}
Account account;
public ViewHolderAccounts(View itemView) {
super(itemView);
icon = itemView.findViewById(R.id.list_item_ico_account);
isRepeating = itemView.findViewById(R.id.list_item_isrepeating);
isAlert = itemView.findViewById(R.id.list_item_isalert);
title = itemView.findViewById(R.id.list_item_title_account);
total = itemView.findViewById(R.id.list_item_desc_account);
account = null; // The account needs to be set using the setter/getter method
} // ViewHolderAccounts
} // class ViewHolderAccounts
List<Account> accts = new ArrayList<Account>();
ViewGroup parent;
#NonNull
#Override
public ViewHolderAccounts onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.list_item_account,parent,false);
this.parent = parent;
ViewHolderAccounts vh = new ViewHolderAccounts(v);
return vh;
} // onCreateViewHolder
#Override
public void onBindViewHolder(#NonNull ViewHolderAccounts holder, int position) {
// Look into the list the item with id=position
Optional<Account> la = accts.stream()
.filter(ac->ac.getId()==(long)position)
.findFirst();
if ( la.isPresent() ) {
int res = parent.getResources().getIdentifier(la.get().getIcon(), "drawable", "com.almonisolutions.elgddt");
holder.icon.setImageResource(res);
holder.isRepeating.setImageResource(R.drawable.automatic);
holder.isAlert.setImageResource(R.drawable.notifications);
holder.title.setText(la.get().getTitle());
holder.total.setText(la.get().getDescription());
holder.setAccount(la.get());
holder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (holder.getAccount() != null) {
callBackFunction.onAccountSelected(holder.getAccount());
} // if (account != null)
} // public void onClick
});
} // if
} // onBindViewHolder
#Override
public int getItemCount() {
return accts.size();
} // getItemCount
RecyclerAdapterAccounts() {
super();
for(int i=0;i<16;i++) {
Account la = new Account();
la.setId((long) i);
la.setTitle("The item number " + i);
la.setDescription("$" + (1000*i));
switch(i%3) {
case 0: la.setIcon("imaged"); break;
case 1: la.setIcon("person_old"); break;
case 2: la.setIcon("pet"); break;
default: la.setIcon("add");
} // switch
accts.add(la);
} // for
} // RecyclerAdapterAccounts
} // class RecyclerAdapterAccounts
At first, In the ExpensesFragment I was getting an Exception that throw the message "Fragment already added". When I changed the ExpensesListFragment to static final, that error was gone.
Again, to recreate the error, you need to run in portrait mode, move through the tabs. Finish on anyone but the first one. Them rotate the device. Tap on the first tab. Then tap on the 3rd one, the one with the recyclerview. Swipe through the list and you will see it is double.
Any help will be appreciated.
Thanks in advance!!!

So I found the answer. ADM (see comment above) sent me to a previous article where part of the solution was to extend ViewPager and override instantiateItem. But I did not want to extend ViewPager.
However, in the same article was another link to this other article where there was the following explanation:
Blockquote By default, [FragmentPagerAdapter] will only preload one Fragment in front and behind the current position (although it does not destroy them unless you are using FragmentStatePagerAdapter).
So, I made TabPagerAdapter extend FragmentStatePagerAdapter instead of FragmentPageAdapter... and that was it!!
Thanks ADM for pointing to the right series of articles.

Android - Observing on live data not working from fragment

I have 2 fragment in activityty a list fragment and details fragment,details fragment showing selected items details from list fragment and there is button to change list item "status" set order as ready.
I want to move selected item to ready seaction when button Order is ready clicked.
I tried it with observing with shared view model but onchange method not calling when I set value in it.
here is a viewModel:
package com.example.ordermanager.fragments;
import android.database.ContentObserver;
import android.os.Handler;
import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.ViewModel;
import com.example.ordermanager.fragments.orderlist.dummy.DummyContent;
import java.util.List;
public class SharedViewModel extends ViewModel {
private MutableLiveData<DummyContent.DummyItem> item = new MutableLiveData<DummyContent.DummyItem>();
public void setItem(DummyContent.DummyItem value){
item.setValue(value);
}
public MutableLiveData<DummyContent.DummyItem> getItem(){
return item;
};
}
ListFragment:
public class OrderItemFragment extends Fragment {
// TODO: Customize parameter argument names
private static final String ARG_COLUMN_COUNT = "column-count";
// TODO: Customize parameters
private int mColumnCount = 1;
private OnListFragmentInteractionListener mListener;
private SharedViewModel vm;
private RecyclerView recyclerView;
/**
* Mandatory empty constructor for the fragment manager to instantiate the
* fragment (e.g. upon screen orientation changes).
*/
public OrderItemFragment() {
}
// TODO: Customize parameter initialization
#SuppressWarnings("unused")
public static OrderItemFragment newInstance(int columnCount) {
OrderItemFragment fragment = new OrderItemFragment();
Bundle args = new Bundle();
args.putInt(ARG_COLUMN_COUNT, columnCount);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mColumnCount = getArguments().getInt(ARG_COLUMN_COUNT);
}
vm = ViewModelProviders.of(this).get(SharedViewModel.class);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_order_item_list, container, false);
// Set the adapter
if (view instanceof RecyclerView) {
Context context = view.getContext();
recyclerView = (RecyclerView) view;
if (mColumnCount <= 1) {
recyclerView.setLayoutManager(new LinearLayoutManager(context));
} else {
recyclerView.setLayoutManager(new GridLayoutManager(context, mColumnCount));
}
recyclerView.setAdapter(new MyOrderItemRecyclerViewAdapter(DummyContent.ITEMS, mListener));
}
return view;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
Observer<DummyItem> itemObserver = new Observer<DummyItem>() {
#Override
public void onChanged(#Nullable DummyItem selectedItem) {
//this never happening
Log.e("hereeeee","dfgdfg");
recyclerView.getAdapter().notifyDataSetChanged();
}
};
vm.getItem().observe(this, itemObserver);
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnListFragmentInteractionListener) {
mListener = (OnListFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnListFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p/>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnListFragmentInteractionListener {
// TODO: Update argument type and name
void onListFragmentInteraction(DummyItem item);
}
}
DetailsFragment:
public class OrderDetailFragment extends Fragment {
private SharedViewModel mViewModel;
private DummyContent.DummyItem selectedItem;
private Button ReadyBtn;
public static OrderDetailFragment newInstance() {
return new OrderDetailFragment();
}
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container,
#Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.order_detail_fragment, container, false);
Bundle bundle = getArguments();
if(bundle != null){
selectedItem = (DummyContent.DummyItem)getArguments().getSerializable("item");
TextView tv = (TextView) view.findViewById(R.id.detailid);
tv.setText(selectedItem.content);
}
ReadyBtn = view.findViewById(R.id.readyBtn);
ReadyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(selectedItem != null){
selectedItem.isReady = true;
mViewModel.getItem().setValue(selectedItem);
}
}
});
return view;
}
#Override
public void onActivityCreated(#Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
mViewModel = ViewModelProviders.of(this).get(SharedViewModel.class);
}
}
Observer is in ListFragment OnViewCreated function
Any Ideas?

You should change the data in your adapter before calling notifyDataSetChanged() method. Now you are getting new value in itemObserver but you're not changing the adapter.
UPD. I've solved the problem! The key in your initialization code of SharedViewModel. You should attach activity to the ViewModelProviders class in both cases, but you use this and in reality you have two different instances instead of one which should be attached to the parent activity. So, change the code of initialization to
mViewModel = ViewModelProviders.of(getActivity()).get(SharedViewModel.class); and it'll work!

When you declare local variables in functions, they get destroyed when the function call ends. Therefore you need to store your itemObserver in a field.
On a side note...
You don't need a default empty constructor in fragments unless you create a custom one, which isn't recommended.
Regarding recyclerview I would recommend reading this in detail (especially the ListAdapter part).

Android- layer beneath the cardviews when scrolling in recyclerview

For a personal project, i'm building an app which shows the current tables of the most popular football (or should i say soccer?) leagues in Europe. The table is a recyclerview, and each team inside it is a cardview. At the begining when my device is on portrait mode, everything shows up fine, but the problem starts when i change to landscape mode and then back to portrait. After that, i see another layer of my cardviews, beneath my current cardviews, and everything gets really ugly.
This is how it looks when everything gets messy
My recyclerview adapter:
public class TeamAdapter extends RecyclerView.Adapter<TeamAdapter.TeamViewHolder> {
private TeamLeagueStandings[] teams;
public TeamAdapter(TeamLeagueStandings[] teams){
this.teams=teams;
}
#Override
public TeamAdapter.TeamViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.
from(parent.getContext()).
inflate(R.layout.card_view_team, parent, false);
return new TeamViewHolder(itemView);
}
#Override
public void onBindViewHolder(TeamAdapter.TeamViewHolder holder, int position) {
TeamLeagueStandings team = teams[position];
holder.teamname.setText(team.getTeamName());
holder.matches.setText(Integer.toString(team.getCurGames()));
holder.wins.setText(Integer.toString(team.getWins()));
holder.draws.setText(Integer.toString(team.getDraws()));
holder.losses.setText(Integer.toString(team.getLosses()));
holder.gd.setText(Integer.toString(team.getGoalDifference()));
holder.points.setText(Integer.toString(team.getPoints()));
}
#Override
public int getItemCount() {
return teams.length;
}}
My view holder (inner class inside the adapter):
public static class TeamViewHolder extends RecyclerView.ViewHolder{
protected TextView teamname;
protected TextView matches;
protected TextView wins;
protected TextView draws;
protected TextView losses;
protected TextView gd;
protected TextView points;
public TeamViewHolder(View itemView) {
super(itemView);
teamname=itemView.findViewById(R.id.teamName_txtview);
matches=itemView.findViewById(R.id.matches_txtview);
wins=itemView.findViewById(R.id.wins_txtview);
draws=itemView.findViewById(R.id.draws_txtview);
losses=itemView.findViewById(R.id.losses_txtview);
gd=itemView.findViewById(R.id.gd_txtview);
points=itemView.findViewById(R.id.points_txtview);
}
}
Finally, my main fragment, where i declare the recyclerview:
public class TableStandingsFragment extends Fragment {
// TODO: Rename parameter arguments, choose names that match
// the fragment initialization parameters, e.g. ARG_ITEM_NUMBER
private static final String ARG_PARAM1 = "param1";
private static final String ARG_PARAM2 = "param2";
TeamAdapter adapter;
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
private OnFragmentInteractionListener mListener;
public TableStandingsFragment() {
// Required empty public constructor
}
/**
* Use this factory method to create a new instance of
* this fragment using the provided parameters.
*
* #param param1 Parameter 1.
* #param param2 Parameter 2.
* #return A new instance of fragment BlankFragment.
*/
// TODO: Rename and change types and number of parameters
public static TableStandingsFragment newInstance(String param1, String param2) {
TableStandingsFragment fragment = new TableStandingsFragment();
Bundle args = new Bundle();
args.putString(ARG_PARAM1, param1);
args.putString(ARG_PARAM2, param2);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
public TeamLeagueStandings [] GetPLTeams() throws IOException, JSONException {
URL urlPL= League_standings.GetPLQuery();
TeamLeagueStandings[] teams=League_standings.LeagueStandingsArray(urlPL);
return teams;
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
StrictMode.setThreadPolicy(policy);
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.fragment_table, container, false);
try {
adapter= new TeamAdapter(GetPLTeams());
RecyclerView recyclerView = (RecyclerView) v.findViewById(R.id.recyler_teams);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(adapter);
recyclerView.addItemDecoration(new VerticalSpaceItemDecorator(30));
LinearLayoutManager layoutManager = new LinearLayoutManager(getContext());
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
recyclerView.setLayoutManager(layoutManager);
} catch (IOException e) {
e.printStackTrace();
} catch (JSONException e) {
e.printStackTrace();
}
return v;
}
// TODO: Rename method, update argument and hook method into UI event
public void onButtonPressed(Uri uri) {
if (mListener != null) {
mListener.onFragmentInteraction(uri);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
class VerticalSpaceItemDecorator extends RecyclerView.ItemDecoration {
private final int spacer;
public VerticalSpaceItemDecorator(int spacer) {
this.spacer = spacer;
}
#Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
super.getItemOffsets(outRect, view, parent, state);
outRect.bottom = spacer;
}
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
* <p>
* See the Android Training lesson <a href=
* "http://developer.android.com/training/basics/fragments/communicating.html"
* >Communicating with Other Fragments</a> for more information.
*/
public interface OnFragmentInteractionListener {
// TODO: Update argument type and name
void onFragmentInteraction(Uri uri);
}
}
Of course, there is more code that i didn't upload, i think that this code that i do upload is enough in order to solve this problem.
Thanks!!

In your Activity try this code for fragment transaction
getSupportFragmentManager().beginTransaction()
.replace(your container id, TableStandingsFragment.newInstance(param1,param2), TableStandingsFragment.class.getSimpleName())
.commitAllowingStateLoss();
Make sure you are importing right Fragment in TableStandingsFragment
import android.support.v4.app.Fragment;

Remove recyclerView.setHasFixedSize(true);from you code and set your cardView height to wrap_content. You have to configure recyclerview before setting adapter.
Your recycler view initialization should be like this.
RecyclerView recyclerView = (RecyclerView) v.findViewById(R.id.recyler_teams);
recyclerView.addItemDecoration(new VerticalSpaceItemDecorator(30));
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(adapter);
If you want to know more about hasFixedSize(true) look at here.
https://stackoverflow.com/a/40707099/5558150
https://stackoverflow.com/a/33365341/5558150

ViewPager not updating RecylcerView inside of each tab when switching

I have a ViewPager that I set up in a simple example app. I have a single static fragment implemented as an inner-class with a RecylerView in it. I'd like to change the LayoutManager of the RecyclerView based on which tab I'm in. My implementation is show below. This is not working for me. When I load this ViewPager is starts in the 1st position but has a staggered layout (which should be for the 3rd position). When I swipe over to the 2nd position it is still the staggered layout, nothing changed as the getItem() method of my PagerAdapter was never called. When I switch over to the 3rd position is does call getItem() and the RecylerView is reloaded, however it still has the staggered layout (this is where it actually should have the staggered layout).
After reading up a bit on ViewPagers I'm realizing that the PagerAdapter will reuse the fragment if it determines that it can. I think that is what is happening here. Is there any way to keep this from happening? Can I get my LayoutManager to switch for each tab while just using one Fragment? Essentially I want it to instantiate a new Fragment for each tab.
public class TabbedActivity extends AppCompatActivity {
/**
* The {#link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {#link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {#link android.support.v4.app.FragmentStatePagerAdapter}.
*/
private SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {#link ViewPager} that will host the section contents.
*/
private ViewPager mViewPager;
public static Intent newIntent(Context packageContext){
Intent intent = new Intent(packageContext, TabbedActivity.class);
return intent;
}
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_tabbed);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_tabbed, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
public static class RecyclerFragment extends Fragment {
private static final String ARG_LAYOUT_TYPE = "layout-type";
private int layoutType = 0;
RecyclerView recyclerView;
public ArrayList<AndroidVersion> data;
public DataAdapter adapter;
public static final int FRAGMENT_LINEAR = 0;
public static final int FRAGMENT_GRID = 1;
public static final int FRAGMENT_STAG_GRID = 2;
public static RecyclerFragment newInstance(int layoutType) {
Timber.d("newInstance() called with int: " + layoutType);
RecyclerFragment fragment = new RecyclerFragment();
Bundle args = new Bundle();
args.putInt(ARG_LAYOUT_TYPE, layoutType);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
if(getArguments() != null){
layoutType = getArguments().getInt(ARG_LAYOUT_TYPE);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState){
View rootView = inflater.inflate(R.layout.fragment_linear, container, false);
Button button = (Button) rootView.findViewById(R.id.view_pager_button);
button.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent mainActivityIntent = MainActivity.newIntent(getActivity().getApplicationContext());
startActivity(mainActivityIntent);
}
});
recyclerView = (RecyclerView) rootView.findViewById(R.id.card_recyler_view_pager);
//recyclerView.setHasFixedSize(true);
// Check to see what the layout type should be and create the necessary LayoutManager
switch(layoutType){
case FRAGMENT_LINEAR:
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity(), LinearLayoutManager.VERTICAL, false);
recyclerView.setLayoutManager(layoutManager);
case FRAGMENT_GRID:
GridLayoutManager gridLayoutManager = new GridLayoutManager(getActivity(), 3);
recyclerView.setLayoutManager(gridLayoutManager);
case FRAGMENT_STAG_GRID:
StaggeredGridLayoutManager staggeredGridLayoutManager = new StaggeredGridLayoutManager(3, StaggeredGridLayoutManager.VERTICAL);
recyclerView.setLayoutManager(staggeredGridLayoutManager);
}
loadJSON();
return rootView;
}
private void loadJSON() {
Retrofit retrofit = MainActivity.getRestAdapter();
RequestInterface request = retrofit.create(RequestInterface.class);
Call<JSONResponse> call = request.getJSON();
call.enqueue(new Callback<JSONResponse>() {
#Override
public void onResponse(Call<JSONResponse> call, Response<JSONResponse> response) {
JSONResponse jsonResponse = response.body();
data = new ArrayList<>(Arrays.asList(jsonResponse.getAndroid()));
adapter = new DataAdapter(data);
recyclerView.setAdapter(adapter);
}
#Override
public void onFailure(Call<JSONResponse> call, Throwable t) {
Log.d("Error", t.getMessage());
}
});
}
}
/**
* A {#link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
#Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
Timber.d("getItem called, position: " + position);
return RecyclerFragment.newInstance(position);
}
#Override
public int getCount() {
// Show 3 total pages.
return 3;
}
#Override
public CharSequence getPageTitle(int position) {
switch (position) {
case 0:
return "Linear";
case 1:
return "Grid";
case 2:
return "Staggered";
}
return null;
}
}
}

Try this :
inside the RecyclerFragment class define a static variable :
private static RecyclerFragment instance = null;
and change newInstance method like below :
public static RecyclerFragment newInstance(int layoutType) {
Timber.d("newInstance() called with int: " + layoutType);
instance =new RecyclerFragment();
Bundle args = new Bundle();
args.putInt(ARG_LAYOUT_TYPE, layoutType);
instance.setArguments(args);
return instance;
}

How to create nested fragments and implement FragmentInteractionListener of child fragment in parent fragment

How to create nested fragments and implement FragmentInteractionListener of child fragment in parent fragment NOT in MainActivity
I'm developing an android app that contains a fragment in main layout. Let's call this 'parentFragment'.
I also have another fragment within parentFragment. Let's call this fragment 'childFragment'.
This childFragment, have few methods that need to be implemented in the parentFragment, NOT in MainActivity.
This is where I am struggling to achieve. Firstly, is it possible for a Fragment to implement another Fragment's methods? If yes please advise on how to achieve this.
I have created interface for the child fragments to be implemented by ParentFragment.
Here is my MainActivity Class:
public class MainActivity extends AppCompatActivity {
private NavigationView navigationView;
private DrawerLayout drawer;
private View navHeader;
// and the rest of my variables and setup...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
navigationView = (NavigationView) findViewById(R.id.nav_view);
// Navigation view header
navHeader = navigationView.getHeaderView(0);
// load nav menu header data
loadNavHeader();
// initializing navigation menu
setUpNavigationView();
// Load fragments here. In my case HomeFragment
loadHomeFragment();
}
/***
* Returns respected fragment that user
* selected from navigation menu
*/
private void loadHomeFragment() {
// selecting appropriate nav menu item
selectNavMenu();
// set toolbar title
setToolbarTitle();
// load the HomeFragment
Fragment fragment = getHomeFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame, fragment, CURRENT_TAG);
fragmentTransaction.commitAllowingStateLoss();
//Closing drawer on item click
drawer.closeDrawers();
}
private Fragment getHomeFragment() {
switch (navItemIndex) {
case 0:
// home
HomeFragment fragment = new HomeFragment();
return fragment;
case 1:
// add player
AddPlayerFragment addPlayerFragment = new AddPlayerFragment();
return addPlayerFragment;
case 2:
// settings
SettingsFragment settingsFragment = new SettingsFragment();
return settingsFragment;
case 3:
// help
HelpFragment helpFragment = new HelpFragment();
return helpFragment;
case 4:
// about us
AboutUsFragment aboutUsFragment = new AboutUsFragment();
return aboutUsFragment;
default:
return new HomeFragment();
}
}
// and the rest of my logic for navigations, action bar and so on.
// ....
}
HomeFragment is my parent fragment
public class HomeFragment extends Fragment implements PlayerProfileFragment.OnFragmentInteractionListener {
// players list
private List<Player> playersList;
public HomeFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_home, container, false);
// load data here
playersList = PlayerDao.getInstance(this.getContext()).getAllPlayers();
ViewPager pager = (ViewPager) getView().findViewById(R.id.viewPager);
pager.setAdapter(new MyPagerAdapter(getFragmentManager()));
return rootView;
}
#Override
public void showMoreData(int playerId) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(this.getContext());
builder1.setMessage(" showMoreData id = " + playerId);
builder1.setCancelable(true);
AlertDialog alert12 = builder1.create();
alert12.show();
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
if (fm.getFragments() != null) {
fm.getFragments().clear();
}
}
#Override
public Fragment getItem(int pos) {
Player player = playersList.get(pos);
return PlayerProfileFragment.newInstance(player.getId(), player.getName(), player.getAge(), player.getImagePath());
}
#Override
public int getCount() {
return playersList.size();
}
}
}
PlayerProfileFragment.java is my child fragment.
public class PlayerProfileFragment extends Fragment {
private OnFragmentInteractionListener mListener;
// the fragment initialization parameters
private static final String ARG_PLAYER_NAME = "playerNameParam";
private static final String ARG_PLAYER_AGE = "playerAgeParam";
private static final String ARG_PLAYER_ID = "playerIdParam";
private static final String ARG_PLAYER_IMAGE_PATH = "playerImagePathParam";
private String playerNameParam;
private String playerAgeParam;
private int playerIdParam;
private String playerImagePathParam;
public PlayerProfileFragment() {
// Required empty public constructor
}
public static PlayerProfileFragment newInstance(int param1, String param2, int param3, String param4) {
PlayerProfileFragment fragment = new PlayerProfileFragment();
Bundle args = new Bundle();
args.putInt(ARG_PLAYER_ID, param1);
args.putString(ARG_PLAYER_NAME, param2);
args.putString(ARG_PLAYER_AGE, String.valueOf(param3));
args.putString(ARG_PLAYER_IMAGE_PATH, param4);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
playerNameParam = args.getString(ARG_PLAYER_NAME);
playerAgeParam = args.getString(ARG_PLAYER_AGE);
playerIdParam = args.getInt(ARG_PLAYER_ID);
playerImagePathParam = args.getString(ARG_PLAYER_IMAGE_PATH);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_player_profile, container, false);
TextView tvName = (TextView) v.findViewById(R.id.fragment_player_profile_name);
tvName.setText(playerNameParam);
TextView tvAge = (TextView) v.findViewById(R.id.fragment_player_profile_age);
tvAge.setText(playerAgeParam + " " + getString(R.string.athlete_info_banner_age_years_label));
Button showMoreButton = (Button) v.findViewById(R.id.fragment_player_profile_show_more_button);
showMoreButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onButtonShowMorePressed(playerIdParam);
}
});
return v;
}
public void onButtonShowMorePressed(int playerId) {
if (mListener != null) {
mListener.showMoreData(playerId);
}
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
if (context instanceof OnFragmentInteractionListener) {
mListener = (OnFragmentInteractionListener) context;
} else {
throw new RuntimeException(context.toString()
+ " must implement OnFragmentInteractionListener");
}
}
#Override
public void onDetach() {
super.onDetach();
mListener = null;
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
*/
public interface OnFragmentInteractionListener {
void uploadPlayerData(int playerId);
void editPlayer(int playerId);
void showMoreData(int playerId);
}
}
Please notice that HomeFragment (Parent fragment) does not have onAttach(). Only PlayerProfileFragment has onattach() method. Do I need onAttach() for both fragments?

I finally got it working. Below is what I had to do:
HomeActivity class
public class MainActivity extends AppCompatActivity {
private NavigationView navigationView;
private DrawerLayout drawer;
private View navHeader;
// and the rest of my variables and setup...
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
drawer = (DrawerLayout) findViewById(R.id.drawer_layout);
navigationView = (NavigationView) findViewById(R.id.nav_view);
// Navigation view header
// load nav menu header data
loadNavHeader();
// initializing navigation menu
setUpNavigationView();
// Load fragments here. In my case HomeFragment
loadHomeFragment();
}
/***
* Load navigation menu header information
* like background image, profile image
* name, website, notifications action view (dot)
*/
private void loadNavHeader() {
// some logic here
}
/***
* Returns respected fragment that user
* selected from navigation menu
*/
private void loadHomeFragment() {
// selecting appropriate nav menu item
selectNavMenu();
// set toolbar title
setToolbarTitle();
Fragment fragment = getHomeFragment();
FragmentTransaction fragmentTransaction = getSupportFragmentManager().beginTransaction();
fragmentTransaction.replace(R.id.frame, fragment, CURRENT_TAG);
fragmentTransaction.commitAllowingStateLoss();
//Closing drawer on item click
drawer.closeDrawers();
}
private Fragment getHomeFragment() {
switch (navItemIndex) {
case 0:
// home
HomeFragment fragment = new HomeFragment();
return fragment;
case 1:
// add player
AddPlayerFragment addPlayerFragment = new AddPlayerFragment();
return addPlayerFragment;
case 2:
// settings
SettingsFragment settingsFragment = new SettingsFragment();
return settingsFragment;
case 3:
// help
HelpFragment helpFragment = new HelpFragment();
return helpFragment;
case 4:
// about us
AboutUsFragment aboutUsFragment = new AboutUsFragment();
return aboutUsFragment;
default:
return new HomeFragment();
}
}
// and the rest of my logic for navigations, action bar and so on.
// ....
}
HomeFragment is my parent fragment, please note that it implements OnFragmentInteractionListener also using childFragmentManager when creating my pagerView.
pager.setAdapter(new MyPagerAdapter(getChildFragmentManager()));
public class HomeFragment extends Fragment implements PlayerProfileFragment.OnFragmentInteractionListener {
/**
* The fragment argument representing the item ID that this fragment
* represents.
*/
private PlayerProfileFragment.OnFragmentInteractionListener mListener;
public static final String ARG_ITEM_ID = "item_id";
// players list
private List<Player> playersList;
public HomeFragment() {
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_home, container, false);
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
setupView();
}
#Override
public void onAttach(Context context) {
super.onAttach(context);
mListener = (PlayerProfileFragment.OnFragmentInteractionListener) getParentFragment();
}
private void setupView(){
// load data here
playersList = PlayerDao.getInstance(this.getContext()).getAllPlayers();
ViewPager pager = (ViewPager) getView().findViewById(R.id.viewPager);
// using childFragmentManager was part of my solution
pager.setAdapter(new MyPagerAdapter(getChildFragmentManager()));
}
#Override
public void showMoreData(int playerId) {
AlertDialog.Builder builder1 = new AlertDialog.Builder(this.getContext());
builder1.setMessage(" showMoreData id = " + playerId);
builder1.setCancelable(true);
AlertDialog alert12 = builder1.create();
alert12.show();
}
private class MyPagerAdapter extends FragmentPagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
if (fm.getFragments() != null) {
fm.getFragments().clear();
}
}
#Override
public Fragment getItem(int pos) {
Player player = playersList.get(pos);
return PlayerProfileFragment.newInstance(player.getId(), player.getName(), player.getAge(), player.getImagePath());
}
#Override
public int getCount() {
return playersList.size();
}
}
}
PlayerProfileFragment class is my child fragment. Please note that, This is also part of my solution. Use getParentFragment() to initialise mListener
mListener = (PlayerProfileFragment.OnFragmentInteractionListener) getParentFragment();
public class PlayerProfileFragment extends Fragment {
private OnFragmentInteractionListener mListener;
// the fragment initialization parameters
private static final String ARG_PLAYER_NAME = "playerNameParam";
private static final String ARG_PLAYER_AGE = "playerAgeParam";
private static final String ARG_PLAYER_ID = "playerIdParam";
private static final String ARG_PLAYER_IMAGE_PATH = "playerImagePathParam";
private String playerNameParam;
private String playerAgeParam;
private int playerIdParam;
private String playerImagePathParam;
public PlayerProfileFragment() {
// Required empty public constructor
}
public static PlayerProfileFragment newInstance(int param1, String param2, int param3, String param4) {
PlayerProfileFragment fragment = new PlayerProfileFragment();
Bundle args = new Bundle();
args.putInt(ARG_PLAYER_ID, param1);
args.putString(ARG_PLAYER_NAME, param2);
args.putString(ARG_PLAYER_AGE, String.valueOf(param3));
args.putString(ARG_PLAYER_IMAGE_PATH, param4);
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Bundle args = getArguments();
playerNameParam = args.getString(ARG_PLAYER_NAME);
playerAgeParam = args.getString(ARG_PLAYER_AGE);
playerIdParam = args.getInt(ARG_PLAYER_ID);
playerImagePathParam = args.getString(ARG_PLAYER_IMAGE_PATH);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// This is also part of my solution: getParentFragment() -- very important
mListener = (PlayerProfileFragment.OnFragmentInteractionListener) getParentFragment();
// Inflate the layout for this fragment
View v = inflater.inflate(R.layout.fragment_player_profile, container, false);
TextView tvName = (TextView) v.findViewById(R.id.fragment_player_profile_name);
tvName.setText(playerNameParam);
TextView tvAge = (TextView) v.findViewById(R.id.fragment_player_profile_age);
tvAge.setText(playerAgeParam + " " + getString(R.string.athlete_info_banner_age_years_label));
Button showMoreButton = (Button) v.findViewById(R.id.fragment_player_profile_show_more_button);
showMoreButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
onButtonShowMorePressed(playerIdParam);
}
});
return v;
}
public void onButtonShowMorePressed(int playerId) {
if (mListener != null) {
mListener.showMoreData(playerId);
}
}
/**
* This interface must be implemented by activities that contain this
* fragment to allow an interaction in this fragment to be communicated
* to the activity and potentially other fragments contained in that
* activity.
*/
public interface OnFragmentInteractionListener {
void showMoreData(int playerId);
}
}
I hope it helps you guys. Let me know if you have any question.

Develop Reference

The Android operating system is a mobile operating system that was developed by Google (GOOGL?) to be primarily used for touchscreen devices, cell phones, and tablets.

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