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Material Container Transform animation not working in Java

Im trying to use Material Container Transform in Recyclerview Adapter as described by this post MaterialContainerTransform transition is not Working on Return , but after implementing this in my project im getting null pointer exception error.
As everyone know Material Container Transform animation tutorials are in kotlin and im doing it in java.
So if anyone know how to properly use material container transform animation in recyclerview and point out my mistakes i will be very much thankful to him.
RecyclerView Adapter Class(source)
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> implements Filterable {
private Context context;
private List<Astadhyayi> wordList;
private List<Astadhyayi> filwordList;
private DictionaryDB dictionaryDB;
private OnclickListenerInterface listener;
public RecyclerViewAdapter(Context context, List<Astadhyayi> itemList, DictionaryDB dictionaryDB) {
this.context = context;
this.wordList = itemList;
this.dictionaryDB = dictionaryDB;
filwordList = new ArrayList<Astadhyayi>(itemList);
}
public void setClickListener(OnclickListenerInterface onclickListener) {
this.listener = onclickListener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater = LayoutInflater.from(context);
View view = inflater.inflate(R.layout.wordslist_two_rv, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(final ViewHolder holder, int position) {
Astadhyayi word = wordList.get(position);
holder.rsutras.setText(word.mSutras);
// Animation******
holder.rsutras.setTransitionName(word.getMSutras());
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
holder.bookmark.setImageResource(R.drawable.cards_heart);
} else {
holder.bookmark.setImageDrawable(null);
}
}
#Override
public Filter getFilter() {
return Searched_Filter;
}
private Filter Searched_Filter = new Filter() {
#Override
protected FilterResults performFiltering(CharSequence constraint) {
List<Astadhyayi> filteredList = new ArrayList<>();
if (constraint == null || constraint.length() == 0) {
filteredList.addAll(filwordList);
} else {
String filterPattern = constraint.toString().toLowerCase().trim();
for (Astadhyayi item : filwordList) {
if (item.getMSutras().toLowerCase().contains(filterPattern)) {
filteredList.add(item);
}
}
}
FilterResults results = new FilterResults();
results.values = filteredList;
return results;
}
#Override
protected void publishResults(CharSequence constraint, FilterResults results) {
wordList.clear();
wordList.addAll((ArrayList<Astadhyayi>)results.values);
notifyDataSetChanged();
}
};
#Override
public int getItemCount() {
return wordList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
private TextView rsutras;
private ImageView bookmark;
public ViewHolder(View itemView) {
super(itemView);
itemView.setOnClickListener(this);
rsutras = itemView.findViewById(R.id.tvSansTerm);
bookmark = itemView.findViewById(R.id.bookmarkBtn);
}
/*
#Override
public void onClick(View view) {
if(listener!=null) listener.onItemClicked(getAbsoluteAdapterPosition(), rsutras);
}
*/
#Override
public void onClick(View view) {
int position = this.getAbsoluteAdapterPosition();
Astadhyayi word = wordList.get(position);
//*************** Bundle **************\\
Bundle bundle = new Bundle();
bundle.putParcelable("allData", word);
bundle.putString("transition_name", word.getMSutras());
Fragment detailsFragment = new TermThreeDetailsFragment();
detailsFragment.setSharedElementEnterTransition(new MaterialContainerTransform());
detailsFragment.setArguments(bundle);
FragmentTransaction fT =((AppCompatActivity)context).getSupportFragmentManager().beginTransaction();
fT.setReorderingAllowed(true);
fT.addSharedElement(rsutras, rsutras.getTransitionName()); // Shared element!
fT.replace(R.id.fragment_container, detailsFragment);
fT.addToBackStack(null);
fT.commit();
}
}
}
RecyclerView Fragment Class(source)
public class ShowtermsTwoFragment extends Fragment {
private RecyclerView rv;
private EditText tV;
private Toolbar toolbar;
private LinearLayoutManager layoutManager;
private static DictionaryDB db;
private RecyclerViewAdapter rvAdapter;
private SearchView searchView = null;
private SearchView.OnQueryTextListener queryTextListener;
private List<Astadhyayi> wordsList = new ArrayList<>();
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setExitTransition(new MaterialElevationScale(false));
setReenterTransition(new MaterialElevationScale(true));
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_terms_recyclerview, container, false);
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
toolbar = ((Toolbar) view.findViewById(R.id.toolbar_rv));
rv = view.findViewById(R.id.rvTerms);
tV = view.findViewById(R.id.tVinput);
//*********** TOOLBAR
AppCompatActivity activity = (AppCompatActivity) getActivity();
activity.setSupportActionBar(toolbar);
setHasOptionsMenu(true);
// new Get_DbData().execute();
databaseCheck();
recyclerCheck1();
postponeEnterTransition();
((ViewGroup) view.getParent()).getViewTreeObserver()
.addOnPreDrawListener(new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
startPostponedEnterTransition();
return true;
}
});
}
private void databaseCheck() {
String sanskritWord = getActivity().getIntent().getStringExtra("sanskritWord");
//*********** ### DATABASE OPENING ### ***********\\
db = DictionaryDB.getInstance(this.getActivity());
wordsList = db.getWords((sanskritWord));
}
private void recyclerCheck1() {
layoutManager = new LinearLayoutManager(getContext());
rv.setLayoutManager(layoutManager);
rv.setHasFixedSize(true);
DividerItemDecoration dividerItemDecoration = new DividerItemDecoration(rv.getContext(), layoutManager.getOrientation());
rv.addItemDecoration(dividerItemDecoration);
rvAdapter = new RecyclerViewAdapter(getContext(), wordsList, db);
rv.setAdapter(rvAdapter);
/////********** rvAdapter.setClickListener(this);
rvAdapter.notifyDataSetChanged();
}
}
Details Fragment Class(destination)
public class TermThreeDetailsFragment extends Fragment {
private TextView sutraTV,vrittiTV,padaTv,adhyayTV,sutraIdTV ;
private CoordinatorLayout coordinatorLayout;
private FloatingActionButton fabBtn;
private static DictionaryDB db;
private Astadhyayi word;
private BottomAppBar bottomAppBar;
private TextToSpeech pronunciation;
private AudioManager audio;
private String ttsID , trans;
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
MaterialContainerTransform transform = new MaterialContainerTransform();
transform.setScrimColor(Color.TRANSPARENT);
setSharedElementEnterTransition(transform);
setSharedElementReturnTransition(transform);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
#Override
public void onViewCreated(View view, Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
sutraTV = view.findViewById(R.id.tvSutra);
adhyayTV = view.findViewById(R.id.tVAdhyay);
padaTv = view.findViewById(R.id.tVPada);
sutraIdTV = view.findViewById(R.id.tVSutraId);
vrittiTV = view.findViewById(R.id.tvVritti);
fabBtn = view.findViewById(R.id.favFAB);
coordinatorLayout = view.findViewById(R.id.parentCordlayout);
bottomAppBar = view.findViewById(R.id.bottom_app_bar);
bundleCheckWithDb();
WordCheck();
}
private void bundleCheckWithDb() {
//*********** Geting Parcelable Data
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
trans = bundle.getString("transition_name");
adhyayTV.setText(word.getMAdhyay());
padaTv.setText(word.getMPada());
sutraIdTV.setText(word.getMSutra_id());
sutraTV.setText(word.getMSutras());
vrittiTV.setText(word.getMVritti());
}
//*********** DATABASE OPENING
db = DictionaryDB.getInstance(this.getActivity());
}
private void WordCheck() {
if (word.mStatus != null && word.mStatus.equals(DictionaryDB.BOOKMARKED)) {
fabBtn.setImageResource(R.drawable.cards_heart);
} else {
fabBtn.setImageResource(R.drawable.cards_heart_white);
}
fabBtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
bookMarkWord(word, fabBtn);
}
});
}
}
Error im getting
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.sanskrit.mysearcher.models.Astadhyayi.getMSutras()' on a null object reference
at com.sanskrit.mysearcher.fragments.TermThreeDetailsFragment.onCreateView(TermThreeDetailsFragment.java:69)

From the current given information, I think you should do something like this:
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
word = new Astadhyayi(Parcel.obtain());
Bundle bundle = this.getArguments();
if (bundle != null) {
word = bundle.getParcelable("allData");
}
View view = inflater.inflate(R.layout.show_three_details, container, false);
view.findViewById(R.id.tvSutra).setTransitionName(word.getMSutras());
return view;
}
Again, I am not sure what getMSutras() actually returns and if it's right to use that here.

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);
}
}
}

Strange behavior of OnItemClickListener inside RecyclerView inside Fragment

Need help with android app (java)
My app starts with SplashActivity. During it I`m getting json via retrofit request and after successfull response I fill my DB
SplashActivity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_splash);
ISplashInteractor splashInteractor = new SplashInteractor();
moviePresenter = new MoviePresenter(this, splashInteractor);
moviePresenter.initDB();
}
after DB successfully loaded automatically starts MovieListActivity
public class MovieListActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_movie_list);
FragmentManager fragmentManager = getSupportFragmentManager();
FragmentTransaction transaction = fragmentManager.beginTransaction();
Fragment allMoviesFragment = new AllMoviesFragment();
String tag = "MovieList";
transaction.replace(R.id.main_container, allMoviesFragment, tag);
transaction.commit();
}
}
and at once list of movies loads inside inner fragment AllMoviesFragment(inside recyclerView). till this point everything is ok.
now I set onRecyclerViewItemClickListener - it must open another fragment inside MovieListActivity but instead of this - my app restarts from begining and I observe loading of SpalshActivity again(I put progressbar during request) and again my RecyclerView...
my RecyclerViewAdapter
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private List<MovieDetails> movieList;
private OnRecyclerViewItemClickListener onRecyclerViewItemClickListener;
public RecyclerViewAdapter(List<MovieDetails> movieList) {
this.movieList = movieList;
}
public void setOnRecyclerViewItemClickListener(OnRecyclerViewItemClickListener onRecyclerViewItemClickListener){
this.onRecyclerViewItemClickListener = onRecyclerViewItemClickListener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.simple_selectable_list_item, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
MovieDetails movieDetails = (movieList.get(position));
holder.name.setText(movieDetails.getTitle());
holder.year.setText(String.valueOf(movieDetails.getReleaseYear()));
}
#Override
public int getItemCount() {
if (movieList == null)
return 0;
return movieList.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
TextView name;
TextView year;
public ViewHolder(View itemView) {
super(itemView);
name = itemView.findViewById(R.id.movie_name);
year = itemView.findViewById(R.id.release_year);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
if(onRecyclerViewItemClickListener != null){
int position = getAdapterPosition();
if(position != RecyclerView.NO_POSITION){
onRecyclerViewItemClickListener.onRecyclerViewItemClick(position);
}
}
}
});
}
}
public interface OnRecyclerViewItemClickListener {
void onRecyclerViewItemClick(int position);
}
}
my AllMoviesFragment
public class AllMoviesFragment extends Fragment implements RecyclerViewAdapter.OnRecyclerViewItemClickListener {
private static final String CURR_MOVIE = "Current Movie";
private static final String TAG = "MSApp";
List<MovieDetails> movieList;
RecyclerView recyclerView;
public AllMoviesFragment() {
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
movieList = App.getAppInstance().getDatabaseInstance().getMovieDao().getAllMovies();
movieList.sort(new Comparator<MovieDetails>() {
#Override
public int compare(MovieDetails o1, MovieDetails o2) {
return o2.getReleaseYear() - o1.getReleaseYear();
}
});
View resultView = inflater.inflate(R.layout.fragment_all_movies, container, false);
recyclerView = resultView.findViewById(R.id.recycler_view);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setHasFixedSize(true);
RecyclerViewAdapter adapter = new RecyclerViewAdapter(movieList);
adapter.setOnRecyclerViewItemClickListener(AllMoviesFragment.this);
recyclerView.setAdapter(adapter);
return resultView;
}
#Override
public void onRecyclerViewItemClick(int position) {
MovieDetails choosenMovie = movieList.get(position);
FragmentManager fragmentManager = getFragmentManager();
Fragment movieDetailsFragment = new MovieDetailsFragment();
Bundle args = new Bundle();
args.putParcelable(CURR_MOVIE, choosenMovie);
movieDetailsFragment.setArguments(args);
String tag = "MovieDetails";
FragmentTransaction transaction = fragmentManager.beginTransaction();
transaction.replace(R.id.main_container, movieDetailsFragment, tag);
transaction.addToBackStack(tag);
transaction.commit();
}
}
sorry for long post. I dont know how to cut it
I use App class for db access if it is important

#AkakiKapanadze
you was almost right
I didnot see the error message because it disappeared less 1 second
and class MovieDetailsFragment
after I remove binder of ButterKnife all work... I dont know WHY - I always use Butterknife inside Fragments

Recycle view not displaying data on the first instance

Recycle view not displaying data its shows an empty screen, It displays data when I go back and click the icon again. Not sure why I'm facing this problem.Please check the activity, adaptor and fragment code below. I'm new to android and I'm doing my capstone project it would be great if you can help me.
public class AppDetailsActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setTitle("App Details");
setContentView(R.layout.activity_app);
AppDetailsFragment newFragment = new AppDetailsFragment();
FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
transaction.replace(R.id.recordAppFragmentContainer, newFragment);
transaction.addToBackStack(null);
transaction.commit();
}
public void refreshAppDuration(View v) {
Intent intent = new Intent(this, AppDetailsActivity.class);
startActivity(intent);
}
protected void onPause() {
super.onPause();
}
protected void onStop() {
super.onStop();
}
protected void onDestroy() {
super.onDestroy();
}
public void onBackAppDuration(View v) {
if (getFragmentManager().getBackStackEntryCount() > 0) {
getFragmentManager().popBackStack();
} else {
super.onBackPressed();
}
}
Adaptor
public class AppDetailsAdaptor extends RecyclerView.Adapter<AppDetailsAdaptor.ViewHolder> {
private List<AppUsage> mApps;
private Context mContext;
public AppDetailsAdaptor(Context context, List<AppUsage> apps) {
mApps = apps;
mContext = context;
}
private Context getContext() {
return mContext;
}
#Override
public AppDetailsAdaptor.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = LayoutInflater.from(context);
// Inflate the custom layout
View appUsageView = inflater.inflate(R.layout.item_app_details, parent, false);
// Return a new holder instance
AppDetailsAdaptor.ViewHolder viewHolder = new AppDetailsAdaptor.ViewHolder(appUsageView);
return viewHolder;
}
#Override
public void onBindViewHolder(AppDetailsAdaptor.ViewHolder viewHolder, final int position) {
// Get the data model based on position
final AppUsage ch = mApps.get(position);
// Set item views based on your views and data model
viewHolder._appTextView.setText(ch.getAppName());
viewHolder._durationTextView.setText(ch.getDurationInMinutes());
viewHolder._dateTextView.setText(ch.getDate().substring(0,10));
final String key = ch.getKey();
}
#Override
public int getItemCount() {
return mApps.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView _appTextView;
public TextView _durationTextView;
public TextView _dateTextView;
super(itemView);
_appTextView = (TextView) itemView.findViewById(R.id.rvs_app_name);
_durationTextView = (TextView) itemView.findViewById(R.id.rvs_app_duration);
_dateTextView =(TextView) itemView.findViewById(R.id.rvs_app_date);
}
}
}
Fragment
public class AppDetailsFragment extends Fragment {
final FirebaseDatabase database = FirebaseDatabase.getInstance();
ArrayList<AppUsage> appList = new ArrayList<>();
ArrayList<AppUsage> appListTemp = new ArrayList<>();
ArrayList<AppUsage> appListAdaptor = new ArrayList<>();
ArrayList<AppUsage> appObject = new ArrayList<>();
ArrayList<AppUsage> appListDate = new ArrayList<>();
private AppDetailsFragment.OnFragmentInteractionListener mListener;
private RecyclerView rvApp;
private RecyclerView.Adapter appAdaptor;
private RecyclerView.LayoutManager eLayoutManager;
private EditText date;
private static final int DIALOG_DATE_PICKER = 100;
#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_app_list, container, false);
rvApp = (RecyclerView) rootView.findViewById(R.id.rvAppList);
rvApp.setHasFixedSize(true);
eLayoutManager = new LinearLayoutManager(getActivity());
rvApp.setLayoutManager(eLayoutManager);
appList = getAllAppRecords();
appAdaptor = new AppDetailsAdaptor(getActivity(), appList);
rvApp.setAdapter(appAdaptor);
return rootView;
}
public ArrayList<AppUsage> getAllAppRecords(){
DatabaseReference ref = database.getReference();
ref.child("AppUsage").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
appObject.clear();
HashMap<String,Object> app = null;
Iterator<DataSnapshot> items = dataSnapshot.getChildren().iterator();
while(items.hasNext()){
DataSnapshot item = items.next();
Log.e("Listener",item.toString() );
app =(HashMap<String, Object>) item.getValue();
appObject.add(new AppUsage(app.get("appName").toString(),app.get("durationInMinutes").toString(),app.get("date").toString(),item.getKey()));
}
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
return appObject;
}

Make arraylist parcelable in my code?

Can anybody help me making the arraylist final ArrayList<PieEntry> entries = new ArrayList<>();
Parcelable in my code so I can access it in methods in both fragment a and b
- Fragment a code:
public class SecondFragment extends Fragment {
// Store instance variables
private String title;
private int page;
// newInstance constructor for creating fragment with arguments
public static SecondFragment newInstance(int page, String title) {
SecondFragment fragmentSecond = new SecondFragment();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
fragmentSecond.setArguments(args);
return fragmentSecond;
}
// Store instance variables based on arguments passed
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
}
// Inflate the view for the fragment based on layout XML
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
final View view = inflater.inflate(R.layout.fragment_second, container, false);
TextView tvLabel2 = (TextView) view.findViewById(R.id.textView2);
//Alle Objekte hier einfügen (wie textview tvavel2)
final Button button = (Button) view.findViewById(R.id.button);
final TextView textView = (TextView) view.findViewById(R.id.textView);
final TextView textView2 = (TextView) view.findViewById(R.id.textView2);
final EditText editText = (EditText) view.findViewById(R.id.editText);
final EditText editText2 = (EditText) view.findViewById(R.id.editText2);
final EditText editText3 = (EditText) view.findViewById(R.id.editText3);
final ArrayList<PieEntry> entries = new ArrayList<>();
button.setOnClickListener(new View.OnClickListener() {
public void onClick (View view) {
if (editText3.getText().toString().matches("")) {
Toast.makeText(getActivity(), "You did not enter a Valid Item ID", Toast.LENGTH_LONG).show();
return;
}
else if (editText2.getText().toString().matches("")) {
Toast.makeText(getActivity(), "You did not enter a Valid Quantitiy", Toast.LENGTH_LONG).show();
return;
}
else {
String nomen = (editText3.getText().toString());
float number = Float.parseFloat(editText2.getText().toString());
entries.add(new PieEntry(number, nomen));
editText3.setText("");
editText2.setText("");
editText3.requestFocus();
}
}
});
return view;
}
}
Fragment b code:
public class FirstFragment extends Fragment {
private String title;
private int page;
public static FirstFragment newInstance(int page, String title) {
FirstFragment fragmentFirst = new FirstFragment();
Bundle args = new Bundle();
args.putInt("someInt", page);
args.putString("someTitle", title);
fragmentFirst.setArguments(args);
return fragmentFirst;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
page = getArguments().getInt("someInt", 0);
title = getArguments().getString("someTitle");
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_first, container, false);
EditText editText = (EditText) view.findViewById(R.id.editText);
final PieChart piechart = (PieChart) view.findViewById(R.id.piechart);
final Button button2 = (Button) view.findViewById(R.id.button2);
new ViewPager.OnPageChangeListener() {
#Override
public void onPageScrolled(int position, float positionOffset, int positionOffsetPixels) {
}
#Override
public void onPageSelected(int position) {
}
#Override
public void onPageScrollStateChanged(int position) {
}
};
button2.setOnClickListener(new View.OnClickListener() {
public void onClick (View view) {
getResources().getColor(R.color.violp);
getResources().getColor(R.color.bluep);
getResources().getColor(R.color.redp);
getResources().getColor(R.color.greenp);
getResources().getColor(R.color.yellowp);
getResources().getColor(R.color.orangep);
getResources().getColor(R.color.lightbluep);
getResources().getColor(R.color.purplep);
getResources().getColor(R.color.darkredp);
PieDataSet set = new PieDataSet(entries, "");
set.setColors(new int[]{R.color.bluep, R.color.greenp, R.color.violp, R.color.redp, R.color.yellowp, R.color.orangep, R.color.lightbluep, R.color.purplep, R.color.darkredp}, getActivity());
PieData datax = new PieData(set);
piechart.setData(datax);
Toast.makeText(getActivity(), (R.string.loading),
Toast.LENGTH_SHORT).show();
piechart.setNoDataText(String.valueOf(R.string.nodata));
piechart.notifyDataSetChanged();
piechart.animateX(2000, Easing.EasingOption.EaseInExpo);
piechart.animateY(2000, Easing.EasingOption.EaseInExpo);
}
});
return view;
}
I have tried a number of options so far but I could not get the programm to run.
Any help is apprediated.
Thanks!

In order to transfer data, we need to parcel it or serialize it. Android OS by default promoting Parcelable instead to Serialization. Serialization is a java concept. In your case, you need to create the "PieEntry" class as Parcelable. For that, you need to implement the Parcelable interface in your model.
Check below implementation.
package com.cludprinting.mysample;
import android.os.Parcel;
import android.os.Parcelable;
/**
* Created by nithinjith.pp on 05-01-2017.
* Implement Parcelable in PieEntry.
*
*/
public class PieEntry implements Parcelable {
public static final Parcelable.Creator<PieEntry> CREATOR = new Parcelable.Creator<PieEntry>() {
#Override
public PieEntry createFromParcel(Parcel source) {
return new PieEntry(source);
}
#Override
public PieEntry[] newArray(int size) {
return new PieEntry[size];
}
};
// These are sample instance variables
// Add your own instance variable
private String mName;
private String mDOB;
private int mAge;
public PieEntry(Parcel parcel) {
this.mName = parcel.readString();
this.mDOB = parcel.readString();
this.mAge = parcel.readInt();
}
public int getmAge() {
return mAge;
}
public void setmAge(int mAge) {
this.mAge = mAge;
}
#Override
public int describeContents() {
return 0;
}
#Override
public void writeToParcel(Parcel dest, int flags) {
dest.writeString(this.mName);
dest.writeString(this.mDOB);
dest.writeInt(this.mAge);
}
public String getmDOB() {
return mDOB;
}
public void setmDOB(String mDOB) {
this.mDOB = mDOB;
}
public String getmName() {
return mName;
}
public void setmName(String mName) {
this.mName = mName;
}
}
The instance variable and access methods may change based on your implemenaton.