Develop Reference

how to pass data from second fragment to the first one

so i am trying to make an note keeping app and i have basicly 1 activity with 1 main fragment that opens a second fragment so the user can enter data, the problem is when i send the bundle from the second fragment to the first one, because if i put bundle get arguments in the first one it crashes and i understand why but im not sure how to make it so that it doesnt
Fragment 1
package app.web.fragments.secure_note;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
import androidx.lifecycle.Observer;
import androidx.lifecycle.ViewModelProvider;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.google.android.material.floatingactionbutton.FloatingActionButton;
import com.google.firebase.analytics.FirebaseAnalytics;
import java.util.List;
import app.web.markodunovic.passwordmanager.R;
import app.web.markodunovic.passwordmanager.adapter.NoteAdapter;
import app.web.markodunovic.passwordmanager.room_note.Note;
import app.web.markodunovic.passwordmanager.view_model.NoteViewModel;
public class Secure_Notes_Fragment extends Fragment {
public static final String TAG = "BACK";
private FirebaseAnalytics mFirebaseAnalytics = FirebaseAnalytics.getInstance(getActivity());
private FloatingActionButton floatingActionButton;
private NoteViewModel noteViewModel;
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
if (container == null) {
return null;
}
View view = inflater.inflate(R.layout.fragment_secure_notes, container, false);
RecyclerView recyclerView = view.findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setHasFixedSize(true);
NoteAdapter noteAdapter = new NoteAdapter();
recyclerView.setAdapter(noteAdapter);
noteViewModel = new ViewModelProvider(getActivity()).get(NoteViewModel.class);
noteViewModel.getAllNotes().observe(getActivity(), new Observer<List<Note>>() {
#Override
public void onChanged(List<Note> notes) {
//update recycler view
//Toast.makeText(getActivity(), "On Changed", Toast.LENGTH_SHORT).show();
// it works yey
noteAdapter.setNotes(notes);
}
});
floatingActionButton = view.findViewById(R.id.button_add_note);
floatingActionButton.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
fire(mFirebaseAnalytics);
//Toast.makeText(getContext(), "I Dun Been Clicked", Toast.LENGTH_SHORT).show();
//getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, new PassWord_Fragment()).commit();
newFragment();
}
});
passedData();
return view;
}
private void passedData() {
Bundle bundle = this.getArguments();
if (!bundle.isEmpty()){
String title = bundle.getString("title");
String description = bundle.getString("description");
int value = bundle.getInt("number");
Toast.makeText(getContext(), ""+title+description+value, Toast.LENGTH_SHORT).show();
}else{
Toast.makeText(getContext(), "Bundle Empty", Toast.LENGTH_SHORT).show();
}
}
private void newFragment() {
//sends data need to use bundle instead of intent in fragments
Bundle bundle = new Bundle();
bundle.putString("test","the test works");
NoteAddEditFragment noteAddEditFragment = new NoteAddEditFragment();
noteAddEditFragment.setArguments(bundle);
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager()
.beginTransaction().replace(R.id.fragment_container,noteAddEditFragment).addToBackStack(TAG);
noteAddEditFragment.setArguments(bundle);
fragmentTransaction.commit();
}
private void fire(FirebaseAnalytics mFirebaseAnalytics) {
Bundle firebaseAnalytics = new Bundle();
firebaseAnalytics.putString(FirebaseAnalytics.Param.SCREEN_NAME, "clicked fab button switched to NoteAddEditFragment");
firebaseAnalytics.putString(FirebaseAnalytics.Param.SCREEN_CLASS, "NoteAddEditFragment");
mFirebaseAnalytics.logEvent(FirebaseAnalytics.Event.SCREEN_VIEW, firebaseAnalytics);
}
}
Fragment 2
package app.web.fragments.secure_note;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.NumberPicker;
import android.widget.Toast;
import android.widget.Toolbar;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.appcompat.app.ActionBar;
import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentTransaction;
import java.util.Objects;
import app.web.markodunovic.passwordmanager.R;
public class NoteAddEditFragment extends Fragment {
private EditText editTextTitle, editTextDescription;
private NumberPicker numberPicker;
private Button buttonBack, buttonSave;
public static final String TITLE = "title";
public static final String DESCRIPTION = "description";
public static final String NUMBERPICKER = "number";
#Nullable
#Override
public View onCreateView(LayoutInflater inflater,ViewGroup container,Bundle savedInstanceState) {
if (container==null){
return null;
}
View view = inflater.inflate(R.layout.fragment_secure_notes_edit_update,container,false);
setButtons(view);
checkPassedVallue();
return view;
}
private void setButtons(View view) {
editTextTitle = view.findViewById(R.id.edit_text_title);
editTextDescription = view.findViewById(R.id.edit_text_description);
numberPicker = view.findViewById(R.id.number_picker_priority);
numberPicker.setMinValue(1);
numberPicker.setMaxValue(100);
buttonBack = view.findViewById(R.id.notes_back_button);
buttonBack.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getContext(), "Note not saved", Toast.LENGTH_SHORT).show();
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager()
.beginTransaction().replace(R.id.fragment_container,new Secure_Notes_Fragment());
fragmentTransaction.commit();
}
});
buttonSave = view.findViewById(R.id.notes_save_button);
buttonSave.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
String title = editTextTitle.getText().toString().trim();
String description = editTextDescription.getText().toString().trim();
int numberP = numberPicker.getValue();
if (!title.isEmpty() && !description.isEmpty() && numberP > 0){
//Toast.makeText(getContext(), "ok", Toast.LENGTH_SHORT).show();
Bundle bundle = new Bundle();
bundle.putString(TITLE,title);
bundle.putString(DESCRIPTION,description);
bundle.putInt(NUMBERPICKER,numberP);
Secure_Notes_Fragment secure_notes_fragment = new Secure_Notes_Fragment();
FragmentTransaction fragmentTransaction = getActivity().getSupportFragmentManager()
.beginTransaction().replace(R.id.fragment_container,secure_notes_fragment);
secure_notes_fragment.setArguments(bundle);
fragmentTransaction.commit();
}else{
Toast.makeText(getContext(), "Cant Be Empty", Toast.LENGTH_SHORT).show();
}
}
});
}
private void checkPassedVallue() {
Bundle bundle = this.getArguments();
String passedVallue = bundle.getString("test");
Toast.makeText(getContext(), "this is the passed vallue: " + passedVallue, Toast.LENGTH_SHORT).show();
}
}

how to move from a fragment to a new activity when i clicked an item of recyclerview?

I am using recyclerview in fragment dynamically, now i want to open new activity on click of items with the same object / item.
AllCoursesFeagment.java
package com.example.learningapp.ui.NavigationDrawer.AllCourses;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Adapters.AllCoursesMyAdapter;
import com.example.learningapp.Interface.APIinterface;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import com.example.learningapp.Responses.CourseListResponse;
import com.example.learningapp.RetrofitAPIs.RetrofitAPI;
import com.example.learningapp.utility.ConstantData;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class AllCoursesFragment extends Fragment {
private RecyclerView recyclerView;
private List<CourseListModel> courseListModelList;
public AllCoursesFragment() {
// Required empty public constructor
}
// TODO: Rename and change types and number of parameters
public static AllCoursesFragment newInstance() {
return new AllCoursesFragment();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_all_courses,null);
recyclerView = view.findViewById(R.id.allCourseList_RV);
APIinterface apIinterface = RetrofitAPI.getClient().create(APIinterface.class);
Call<CourseListResponse> call = apIinterface.getAllCourses(ConstantData.AppKey);
call.enqueue(new Callback<CourseListResponse>() {
#Override
public void onResponse(Call<CourseListResponse> call, Response<CourseListResponse> response){
if (response.isSuccessful()){
courseListModelList = response.body().getCourseList();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(new AllCoursesMyAdapter(getActivity(),courseListModelList));
}
}
#Override
public void onFailure(Call<CourseListResponse> call, Throwable t) {
Toast.makeText(getActivity(),"Something went wrong",Toast.LENGTH_LONG).show();
}
});
return view;
}
}
AllCoursesMyAdapter.java
This is my adapter class.
package com.example.learningapp.Adapters;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Activities.CheckoutActivity;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import java.util.List;
public class AllCoursesMyAdapter extends RecyclerView.Adapter<AllCoursesMyAdapter.RecyclerVH> {
Context context;
List<CourseListModel> courseListModelList;
public AllCoursesMyAdapter(Context context, List<CourseListModel> courseListModelList) {
this.context = context;
this.courseListModelList = courseListModelList;
}
#NonNull
#Override
public RecyclerVH onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.single_row_design_allcourses,parent,false);
return new RecyclerVH(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerVH holder, int position) {
final CourseListModel courseListModel = courseListModelList.get(position);
holder.courseTitle.setText(courseListModel.getCourseName());
holder.courseDesc.setText(courseListModel.getCourseDescription());
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
}
private void moveToNewActivity () {
Activity activity = new Activity();
Intent i = new Intent(activity, CheckoutActivity.class);
context.startActivity(i);
((Activity) context).overridePendingTransition(0, 0);
}
#Override
public int getItemCount() {
return courseListModelList.size();
}
public class RecyclerVH extends RecyclerView.ViewHolder {
TextView courseTitle,courseDesc;
Button buyBtn;
public RecyclerVH(#NonNull View itemView) {
super(itemView);
courseTitle = itemView.findViewById(R.id.course_title);
courseDesc = itemView.findViewById(R.id.course_desc);
buyBtn = itemView.findViewById(R.id.btn_buycourse);
}
}
}
I'm gettng crashed when i clicked item
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
Here i am using a stored list of objects and now i want to move to the new activity when i clicked on an item with given position, but i am not able to do that.

private void moveToNewActivity () {
Activity activity = new Activity(); //this is wrong, delete this
...
}
you can't and shouldn't create an instance of an activity like this, it's something the OS has to schedule and handle for you.
you already seem to have context defined somewhere, so that means:
private void moveToNewActivity () {
Intent i = new Intent(context, CheckoutActivity.class);
context.startActivity(i);
...
}
so that means:
#Override
public void onClick(View v) {
moveToNewActivity();
}

How to send Data when cardview clicked to detail content

I try to passing data from cardview when clicked to DetailFragment, in this case I try to use interface in my adapter, but I get an error a null object reference in mOnItemClickListener.onClick(i).
I try to passing data from cardview when clicked to DetailFragment, in this case I try to use interface in my adapter.
I want to passing data to DetailMoviesFragment Class.
this is my CardviewMovieAdapter Class
import android.content.Context;
import android.content.Intent;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestOptions;
import java.util.ArrayList;
public class CardviewMovieAdapter extends RecyclerView.Adapter<CardviewMovieAdapter.CardViewViewHolder> {
private ArrayList<Movie> listMovie;
Context context;
OnItemClickListener mOnItemClickListener;
public void setListMovie(ArrayList<Movie> listMovie) {
this.listMovie = listMovie;
}
public ArrayList<Movie> getListMovie() {
return listMovie;
}
public interface OnItemClickListener {
void onClick(int position);
}
public void setOnItemClickListener(final OnItemClickListener mItemClickListener) {
this.mOnItemClickListener = mItemClickListener;
}
public CardviewMovieAdapter(ArrayList<Movie> listMovie, Context context) {
this.listMovie = listMovie;
this.context = context;
}
#NonNull
#Override
public CardviewMovieAdapter.CardViewViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.list_movie, viewGroup,false);
return new CardViewViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull final CardviewMovieAdapter.CardViewViewHolder cardViewViewHolder, final int i) {
final Movie movie = listMovie.get(i);
Glide.with(cardViewViewHolder.itemView.getContext())
.load(movie.getImageMovie())
.apply(new RequestOptions().override(350, 550))
.into(cardViewViewHolder.imgPhoto);
cardViewViewHolder.tvTitle.setText(movie.getTitleMovie());
cardViewViewHolder.tvDesc.setText(movie.getDescription());
cardViewViewHolder.btnDetail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(cardViewViewHolder.itemView.getContext(), "Detail "+
listMovie.get(cardViewViewHolder.getAdapterPosition()).getTitleMovie(), Toast.LENGTH_SHORT).show();
}
});
cardViewViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(cardViewViewHolder.itemView.getContext(), "Kamu Memilih "+movie.getTitleMovie(), Toast.LENGTH_SHORT).show();
mOnItemClickListener.onClick(i);
}
});
// cardViewViewHolder.itemView.setOnClickListener(new View.OnClickListener() {
// #Override
// public void onClick(View v) {
// Toast.makeText(cardViewViewHolder.itemView.getContext(), "Kamu Memilih "+movie.getTitleMovie(), Toast.LENGTH_SHORT).show();
// }
// });
}
#Override
public int getItemCount() {
return listMovie.size();
}
public class CardViewViewHolder extends RecyclerView.ViewHolder {
ImageView imgPhoto;
TextView tvTitle, tvDesc;
Button btnDetail;
public CardViewViewHolder(#NonNull View itemView) {
super(itemView);
imgPhoto = itemView.findViewById(R.id.img_item_photo);
tvTitle = itemView.findViewById(R.id.tv_title);
tvDesc = itemView.findViewById(R.id.tv_desc);
btnDetail = itemView.findViewById(R.id.btn_detail);
}
}
}
This is my MoviesFragment Class
import android.content.Intent;
import android.content.res.TypedArray;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.widget.CardView;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.ListView;
import java.util.ArrayList;
/**
* A simple {#link Fragment} subclass.
*/
public class MoviesFragment extends Fragment implements View.OnClickListener{
private RecyclerView rvMovie;
private String[] dataMovieTitle;
private String[] dataDescription;
private TypedArray dataPhoto;
private ArrayList<Movie> movies;
Button btnDetail;
private CardviewMovieAdapter adapter;
View view;
final static String KEY = "KEY";
public MoviesFragment() {
// Required empty public constructor
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
view = inflater.inflate(R.layout.fragment_movies, container, false);
//adapter = new CardviewMovieAdapter(movies,getContext());
rvMovie = view.findViewById(R.id.rv_movies);
prepare();
addItem();
showRecyclerCardView();
adapter = new CardviewMovieAdapter(movies, getContext());
adapter.setOnItemClickListener(new CardviewMovieAdapter.OnItemClickListener() {
#Override
public void onClick(int position) {
final Movie movie = movies.get(position);
DetailMoviesFragment detailMoviesFragment = new DetailMoviesFragment();
// Bundle mBundle = new Bundle();
// mBundle.putString(detailMoviesFragment.EXTRA_TITLE, movie.getTitleMovie());
// mBundle.putString(detailMoviesFragment.EXTRA_DESCRIPTION, movie.getDescription());
// mBundle.putInt(detailMoviesFragment.EXTRA_PHOTO, movie.getImageMovie());
// detailMoviesFragment.setArguments(mBundle);
MoviesFragment.newInstance(movie.getTitleMovie(), movie.getDescription(), movie.getImageMovie());
FragmentManager mFragmentManager = getFragmentManager();
if (mFragmentManager!= null) {
FragmentTransaction mFragmentTransaction = mFragmentManager.beginTransaction();
mFragmentTransaction.replace(R.id.containterFragment, detailMoviesFragment, DetailMoviesFragment.class.getSimpleName());
mFragmentTransaction.addToBackStack(null);
mFragmentTransaction.commit();
}
}
});
return view;
}
public static MoviesFragment newInstance(String title, String desc, int image) {
MoviesFragment moviesFragment = new MoviesFragment();
Bundle args = new Bundle();
args.putInt("image", image);
args.putString("title", title);
args.putString("desc", desc);
moviesFragment.setArguments(args);
return moviesFragment;
}
#Override
public void onViewCreated(#NonNull View view, #Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
private void showRecyclerCardView(){
rvMovie.setLayoutManager(new LinearLayoutManager(getActivity()));
CardviewMovieAdapter adapter = new CardviewMovieAdapter(movies,getActivity());
rvMovie.setAdapter(adapter);
}
private void prepare() {
dataMovieTitle = getResources().getStringArray(R.array.data_movie_name);
dataDescription = getResources().getStringArray(R.array.data_desc_movie);
dataPhoto = getResources().obtainTypedArray(R.array.data_photo_movie);
}
private void addItem(){
movies = new ArrayList<>();
for (int i=0; i < dataMovieTitle.length; i++){
Movie movie = new Movie();
movie.setImageMovie(dataPhoto.getResourceId(i, -1));
movie.setTitleMovie(dataMovieTitle[i]);
movie.setDescription(dataDescription[i]);
movies.add(movie);
}
}
#Override
public void onClick(View v) {
if(v.getId() == R.id.card_view){
}
}
}
and this is DetailMoviesActivity Class
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
public class DetailMovieActivity extends AppCompatActivity {
Movie movie;
TextView tvTitle, tvDesc;
ImageView ivMovie;
Button btnDetail;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_detail_movie);
initView();
}
private void initView() {
movie = (Movie) getIntent().getSerializableExtra("informasi");
String judul = movie.getTitleMovie();
String desc = movie.getDescription();
int img = movie.getImageMovie();
tvTitle.setText(judul);
tvDesc.setText(desc);
Picasso.get().load(img).into(ivMovie);
}
}

You can try with delete the setOnItemClickListener and call intent from cardViewViewHolder.itemView.setOnClickListener

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.net.Uri.getScheme()' on a null object reference
i want to know how i can delete only one element in List View
i add alertDialog and when user click long on the element in the list the alertdialog appear
the error in the delete method
private void deleteAlert() {
int rowsDeleted = getActivity().getContentResolver().delete(mCurrentPetUri, null, null); //error
if (rowsDeleted == 0) {
Toast.makeText(getActivity(), getString(R.string.editor_delete_alert_failed),
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(), getString(R.string.editor_delete_alert_successful),
Toast.LENGTH_SHORT).show();
}
}
and this the fragment
package com.amira.amira.amira.ChatCalendarProfile.Calendar;
import android.app.AlertDialog;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.database.Cursor;
import android.net.Uri;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.support.v4.app.NavUtils;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.support.v4.app.LoaderManager;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.CursorAdapter;
import android.content.ContentUris;
import android.content.ContentValues;
import android.widget.Toast;
import com.amira.amira.amira.R;
import static com.amira.amira.amira.ChatCalendarProfile.Calendar.data.AlertContract.*;
public class CalendarFragment extends Fragment implements LoaderManager.LoaderCallbacks<Cursor> {
private static final int ALERT_LOADER = 0;
AlertCursorAdapter mCursorAdapter;
private Uri mCurrentPetUri;
public CalendarFragment() {
}
#Nullable
#Override
public View onCreateView(#NonNull LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.activity_calendar_fragment, container, false);
com.github.clans.fab.FloatingActionButton addAlert = rootView.findViewById(R.id.add_alert);
addAlert.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(), EditorActivity.class);
startActivity(intent);
}
});
ListView AlertListView = (ListView) rootView.findViewById(R.id.list);
View emptyView = rootView.findViewById(R.id.empty);
AlertListView.setEmptyView(emptyView);
Intent intent = getActivity().getIntent();
mCurrentPetUri = intent.getData();
AlertListView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
#Override
public boolean onItemLongClick(AdapterView<?> arg0, final View arg1, final int pos, long id) {
showDeleteConfirmationDialog();
return true;
}
});
mCursorAdapter = new AlertCursorAdapter(getActivity(), null);
AlertListView.setAdapter(mCursorAdapter);
AlertListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> adapterView, View view, int position, long id) {
Intent intent = new Intent(getActivity(), EditorActivity.class);
Uri currentAlertUri = ContentUris.withAppendedId(AlertEntry.CONTENT_URI, id);
intent.setData(currentAlertUri);
startActivity(intent);
}
});
getLoaderManager().initLoader(ALERT_LOADER, null, this);
return rootView;
}
private void showDeleteConfirmationDialog() {
AlertDialog.Builder builder = new AlertDialog.Builder(getActivity());
builder.setMessage(R.string.delete_dialog_msg);
builder.setPositiveButton(R.string.delete, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
deletePet();
}
});
builder.setNegativeButton(R.string.cancel, new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int id) {
if (dialog != null) {
dialog.dismiss();
}
}
});
AlertDialog alertDialog = builder.create();
alertDialog.show();
}
#Override
public Loader<Cursor> onCreateLoader(int i, Bundle bundle) {
String[] projection = {
AlertEntry._ID,
AlertEntry.COLUMN_ALERT_TITLE,
AlertEntry.COLUMN_ALERT_LOCATION,
AlertEntry.COLUMN_ALERT_OCCASION_DATE,
AlertEntry.COLUMN_ALERT_OCCASION_TIME};
return new CursorLoader(getActivity(), // Parent activity context
AlertEntry.CONTENT_URI, // Provider content URI to query
projection, // Columns to include in the resulting Cursor
null, // No selection clause
null, // No selection arguments
null);
}
private void deletePet() {
int rowsDeleted = getActivity().getContentResolver().delete(mCurrentPetUri, null, null);
if (rowsDeleted == 0) {
Toast.makeText(getActivity(), getString(R.string.editor_delete_alert_failed),
Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getActivity(), getString(R.string.editor_delete_alert_successful),
Toast.LENGTH_SHORT).show();
}
}
#Override
public void onLoadFinished(Loader<Cursor> loader, Cursor cursor) {
mCursorAdapter.swapCursor(cursor);
}
#Override
public void onLoaderReset(Loader<Cursor> loader) {
mCursorAdapter.swapCursor(null);
}
}

Check your data which you were setting with setData method when your start your activity, because intent.getData() is null now

favorite Recycler view updates only on relaunching app

I developed a word app that contains English vocabularies and users can add their favorite word by clicking on a floating button. Every time my favorite list has at list one item it is updated but when it's empty it doesn't show anything but when I run app again list updates.
if you need any code let me know to send it .
UPDATE:
Inner page :
selectDb();
if(selectFavoriteState()){
favorite.setImageResource(R.drawable.ic_favorite_like);
}else {
favorite.setImageResource(R.drawable.ic_favorite_maylike);
}
favorite.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (selectFavoriteState()){
favorite.setImageResource(R.drawable.ic_favorite_maylike);
updateUnfavorited();
}else {
favorite.setImageResource(R.drawable.ic_favorite_like);
updateFavorited();
}
}
});
private void selectDb(){
destpath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/ielts/";
database = SQLiteDatabase.openOrCreateDatabase(destpath + "/md_book.db", null);
}
private boolean selectFavoriteState(){
#SuppressLint("Recycle") Cursor cursor = database.rawQuery("SELECT * FROM main WHERE id = " + id, null);
while (cursor.moveToNext()){
favoriteState = cursor.getString(cursor.getColumnIndex("fav"));
}
return favoriteState.equals("1");
}
private void updateFavorited(){
database.execSQL( "UPDATE main SET fav = 1 WHERE id = " + id);
}
private void updateUnfavorited(){
database.execSQL( "UPDATE main SET fav = 0 WHERE id = " + id);
}
Update 2:
package farmani.com.essentialwordsforielts.mainPage;
import android.os.Bundle;
import android.provider.ContactsContract;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import farmani.com.essentialwordsforielts.R;
public class PageFragment extends Fragment {
private int mPage;
public static final String ARG_PAGE = "ARG_PAGE";
RecyclerView recyclerView;
AdapterFav adapterFav;
public static PageFragment newInstance(int page) {
Bundle args = new Bundle();
args.putInt(ARG_PAGE, page);
PageFragment fragment = new PageFragment();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate( Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
mPage = getArguments().getInt(ARG_PAGE);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_page, container, false);
if (mPage == 1) {
recyclerView = (RecyclerView) view.findViewById(R.id.my_recycler_view);
AdapterList adapter = new AdapterList(MainActivity.context);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.context));
}
if (mPage == 2) {
recyclerView = (RecyclerView) view.findViewById(R.id.my_recycler_view);
adapterFav = new AdapterFav(MainActivity.context);
recyclerView.setAdapter(adapterFav);
recyclerView.setLayoutManager(new LinearLayoutManager(MainActivity.context));
}
return view;
}
#Override
public void onResume() {
super.onResume();
if (adapterFav != null){
adapterFav.notifyDataSetChanged();
}
}
}
Update 3 :AdapterFav
package farmani.com.essentialwordsforielts.mainPage;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import farmani.com.essentialwordsforielts.R;
import farmani.com.essentialwordsforielts.innerpage.ActivityInnerPage;
public class AdapterFav extends RecyclerView.Adapter<ViewHolder> {
Context context;
LayoutInflater inflater;
TextView title;
ImageView avatar;
LinearLayout cardAdapter;
public AdapterFav(Context context){
this.context = context;
inflater = LayoutInflater.from(context);
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = inflater.inflate(R.layout.adapter_card_view, parent, false);
title = (TextView) view.findViewById(R.id.title1);
avatar = (ImageView) view.findViewById(R.id.avatar);
cardAdapter = (LinearLayout) view.findViewById(R.id.card_adapter);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.title.setText(MainActivity.favorite.get(position).getWord());
String img = MainActivity.favorite.get(position).getImg();
int id = MainActivity.context.getResources().getIdentifier(img, "drawable", MainActivity.context.getPackageName());
holder.avatar.setImageResource(id);
holder.cardAdapter.setOnClickListener(clickListener);
holder.cardAdapter.setId(position);
}
View.OnClickListener clickListener = new View.OnClickListener() {
#Override
public void onClick(View view) {
int position = view.getId();
Intent intent = new Intent (MainActivity.context, ActivityInnerPage.class);
intent.putExtra("name", "favorite");
intent.putExtra("id", position + "");
intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
MainActivity.context.startActivity(intent);
}
};
#Override
public int getItemCount() {
return MainActivity.favorite.size();
}
}
Update 4: MainActivity
package farmani.com.essentialwordsforielts.mainPage;
import android.Manifest;
import android.annotation.SuppressLint;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.os.Build;
import android.os.Environment;
import android.support.annotation.NonNull;
import android.support.design.widget.NavigationView;
import android.support.design.widget.TabLayout;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v4.view.ViewPager;
import android.support.v4.widget.DrawerLayout;
import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.widget.ImageView;
import android.widget.Toast;
import com.nabinbhandari.android.permissions.PermissionHandler;
import com.nabinbhandari.android.permissions.Permissions;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.ArrayList;
import farmani.com.essentialwordsforielts.R;
import farmani.com.essentialwordsforielts.search.ActivitySearch;
import farmani.com.essentialwordsforielts.setting.ActivitySetting;
public class MainActivity extends AppCompatActivity {
public static Context context;
public static ArrayList<Structure> list = new ArrayList<>();
public static ArrayList<Structure> favorite = new ArrayList<>();
DrawerLayout drawerLayout;
NavigationView navigationView;
ImageView hamburger;
SQLiteDatabase database;
String destPath;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.navigation_activity_main);
Permissions.check(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE,
Manifest.permission.WRITE_EXTERNAL_STORAGE},
" storage permissions are required to copy database", new Permissions.Options()
.setSettingsDialogTitle("Warning!").setRationaleDialogTitle("Info"),
new PermissionHandler() {
#Override
public void onGranted() {
setupDB();
selectList();
selectFavorite();
}
});
context = getApplicationContext();
setTabOption();
drawerLayout = findViewById(R.id.navigation_drawer);
navigationView = findViewById(R.id.navigation_view);
hamburger = findViewById(R.id.hamburger);
hamburger.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
drawerLayout.openDrawer(Gravity.START);
}
});
navigationView.setNavigationItemSelectedListener(new NavigationView.OnNavigationItemSelectedListener() {
#Override
public boolean onNavigationItemSelected(#NonNull MenuItem item) {
int id = item.getItemId();
if (id == R.id.exit) {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(
MainActivity.this);
alertDialog.setTitle(R.string.exit);
alertDialog.setMessage(R.string.exit_ask);
alertDialog.setCancelable(false);
alertDialog.setPositiveButton(R.string.yes,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
which) {
finish();
}
});
alertDialog.setNegativeButton(R.string.no,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int
which) {
dialog.cancel();
}
});
alertDialog.show();
}else if (id == R.id.search) {
Intent intent = new Intent(MainActivity.this, ActivitySearch.class);
MainActivity.this.startActivity(intent);
} else if (id == R.id.setting) {
Intent intent = new Intent(MainActivity.this, ActivitySetting.class);
MainActivity.this.startActivity(intent);
}
return true;
}
});
}
#Override
public void onBackPressed() {
if (drawerLayout.isDrawerOpen(Gravity.START)) {
drawerLayout.closeDrawer(Gravity.START);
} else {
AlertDialog.Builder alertDialog = new AlertDialog.Builder(
MainActivity.this);
alertDialog.setTitle(R.string.exit);
alertDialog.setMessage(R.string.exit_ask);
alertDialog.setCancelable(false);
alertDialog.setPositiveButton(R.string.yes,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
finish();
}
});
alertDialog.setNegativeButton(R.string.no,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
alertDialog.show();
}
}
private void setTabOption() {
ViewPager viewPager = findViewById(R.id.viewpager);
viewPager.setAdapter(new AdapterFragment(getSupportFragmentManager(),
context));
TabLayout tabStrip = findViewById(R.id.tabs);
tabStrip.setupWithViewPager(viewPager);
}
#Override
protected void onResume() {
super.onResume();
if (!list.isEmpty()){
list.clear();
selectList();
} if (!favorite.isEmpty()){
favorite.clear();
selectFavorite();
}
}
private void setupDB() {
try {
destPath =
Environment.getExternalStorageDirectory().getAbsolutePath() + "/ielts/";
File file = new File(destPath);
if (!file.exists()) {
file.mkdirs();
file.createNewFile();
CopyDB(getBaseContext().getAssets().open("md_book.db"),
new FileOutputStream(destPath + "/md_book.db"));
}
} catch (IOException e1) {
e1.printStackTrace();
}
}
private void CopyDB(InputStream inputStream, OutputStream outputStream)
throws IOException {
byte[] buffer = new byte[1024];
int length;
while ((length = inputStream.read(buffer)) > 0) {
outputStream.write(buffer, 0, length);
}
inputStream.close();
outputStream.close();
}
private void selectFavorite() {
database = SQLiteDatabase.openOrCreateDatabase(destPath + "/md_book.db",
null);
#SuppressLint("Recycle") Cursor cursor = database.rawQuery("SELECT * FROM main WHERE fav = 1",
null);
while (cursor.moveToNext()) {
String word = cursor.getString(cursor.getColumnIndex("word"));
String definition =
cursor.getString(cursor.getColumnIndex("definition"));
String trans = cursor.getString(cursor.getColumnIndex("trans"));
String img = cursor.getString(cursor.getColumnIndex("img"));
int id = cursor.getInt(cursor.getColumnIndex("id"));
Structure struct = new Structure(word, definition, trans, img, id);
struct.setWord(word);
struct.setDefinition(definition);
struct.setTrans(trans);
struct.setImg(img);
struct.setId(id);
favorite.add(struct);
}
}
private void selectList() {
database = SQLiteDatabase.openOrCreateDatabase(destPath + "/md_book.db",
null);
#SuppressLint("Recycle") Cursor cursor = database.rawQuery("SELECT * FROM main", null);
while (cursor.moveToNext()) {
String word = cursor.getString(cursor.getColumnIndex("word"));
String definition =
cursor.getString(cursor.getColumnIndex("definition"));
String trans = cursor.getString(cursor.getColumnIndex("trans"));
String img = cursor.getString(cursor.getColumnIndex("img"));
int id = cursor.getInt(cursor.getColumnIndex("id"));
Structure struct = new Structure(word, definition, trans, img, id);
struct.setWord(word);
struct.setDefinition(definition);
struct.setTrans(trans);
struct.setImg(img);
struct.setId(id);
list.add(struct);
}
}
}
Update 5 innerpage activity
package farmani.com.essentialwordsforielts.innerpage;
import android.annotation.SuppressLint;
import android.content.ClipData;
import android.content.ClipboardManager;
import android.content.Context;
import android.content.Intent;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.os.Environment;
import android.support.design.widget.CollapsingToolbarLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.view.Gravity;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toolbar;
import java.lang.reflect.Field;
import farmani.com.essentialwordsforielts.R;
import farmani.com.essentialwordsforielts.mainPage.AdapterFav;
public class ActivityInnerPage extends AppCompatActivity {
private TextView contentDescriptione;
private TextView moreDescriptione;
private ImageView avatar;
private ImageView imgCopy;
private ImageView imgShare;
private ImageView imgSms;
private ImageView imgGmail;
private FloatingActionButton favorite;
private CollapsingToolbarLayout collapsingToolbarLayout;
public String word;
public String definition;
public String trans;
public String img;
public int id;
private String destpath;
private SQLiteDatabase database;
private String favoriteState;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_inner_page);
final android.support.v7.widget.Toolbar toolbar = findViewById(R.id.toolbar);
toolbar.setNavigationOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Intent i = new Intent(getApplicationContext(),MainActivity.class);
startActivity(i);
finish();
}
});
Bundle extras = getIntent().getExtras();
if (extras != null) {
int layoutId = Integer.parseInt(extras.getString("id"));
String pageName = extras.getString("name");
assert pageName != null;
if (pageName.equals("list")) {
id = MainActivity.list.get(layoutId).getId();
word = MainActivity.list.get(layoutId).getWord();
definition = MainActivity.list.get(layoutId).getDefinition();
trans = MainActivity.list.get(layoutId).getTrans();
img = MainActivity.list.get(layoutId).getImg();
} else if (pageName.equals("favorite")) {
id = MainActivity.favorite.get(layoutId).getId();
word = MainActivity.favorite.get(layoutId).getWord();
definition = MainActivity.favorite.get(layoutId).getDefinition();
trans = MainActivity.favorite.get(layoutId).getTrans();
img = MainActivity.favorite.get(layoutId).getImg();
}
}
contentDescriptione = findViewById(R.id.content_description);
moreDescriptione = findViewById(R.id.more_description);
imgCopy = findViewById(R.id.img_copy);
imgShare = findViewById(R.id.img_share);
imgSms = findViewById(R.id.img_sms);
imgGmail = findViewById(R.id.img_gmail);
avatar = findViewById(R.id.avatar);
favorite = findViewById(R.id.favorite);
collapsingToolbarLayout = findViewById(R.id.collapsing_toolbar);
collapsingToolbarLayout.getExpandedTitleMarginStart();
collapsingToolbarLayout.setTitle(word);
collapsingToolbarLayout.setExpandedTitleColor(getResources().getColor(android.R.color.holo_red_light));
contentDescriptione.setText(definition);
moreDescriptione.setText(trans);
int imgageId = MainActivity.context.getResources().getIdentifier(img, "drawable", MainActivity.context.getPackageName());
avatar.setImageResource(imgageId);
SharedPreferences prefes = getSharedPreferences("font_size", MODE_PRIVATE);
int value = prefes.getInt("fontsize", 16);
contentDescriptione.setTextSize(value);
moreDescriptione.setTextSize(value);
selectDb();
if(selectFavoriteState()){
favorite.setImageResource(R.drawable.ic_favorite_like);
}else {
favorite.setImageResource(R.drawable.ic_favorite_maylike);
}
favorite.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
if (selectFavoriteState()){
favorite.setImageResource(R.drawable.ic_favorite_maylike);
updateUnfavorited();
}else {
favorite.setImageResource(R.drawable.ic_favorite_like);
updateFavorited();
}
}
});
imgCopy.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
final ClipboardManager clipboardManager =
(ClipboardManager)ActivityInnerPage.this.getSystemService(Context.CLIPBOARD_SERVICE);
final ClipData clip = ClipData.newPlainText(word, trans+definition);
assert clipboardManager != null;
clipboardManager.setPrimaryClip(clip);
Snackbar.make(view,"متن کپی شد ",Snackbar.LENGTH_SHORT).show();
}
});
imgShare.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Intent shareIntent = new Intent(Intent.ACTION_SEND);
shareIntent.setType("text/plain");
shareIntent.putExtra(Intent.EXTRA_TEXT, definition+trans);
shareIntent.putExtra(Intent.EXTRA_SUBJECT, word);
startActivity(Intent.createChooser(shareIntent, "Share"));
}
});
imgGmail.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
try {
Intent emailIntent = new Intent(Intent.ACTION_SENDTO
, Uri.fromParts("mailto", "", null));
emailIntent.putExtra(Intent.EXTRA_SUBJECT, word);
emailIntent.putExtra(Intent.EXTRA_TEXT, definition);
startActivity(Intent.createChooser(emailIntent, "Send email..."));
}catch (Exception e){
Snackbar.make(view,"برنامه ای برای ارسال ایمیل یافت نشد",Snackbar.LENGTH_SHORT).show();
}
}
});
imgSms.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
try {
Intent sendSms = new Intent(Intent.ACTION_VIEW);
sendSms.putExtra("sms_body", definition + trans);
sendSms.setType("vnd.android-dir/mms-sms");
startActivity(sendSms);
}catch (Exception e){
Snackbar.make(view,"برنامه ای برای ارسال پیام یافت نشد",Snackbar.LENGTH_SHORT).show();
}
}
});
}
private void selectDb(){
destpath = Environment.getExternalStorageDirectory().getAbsolutePath() + "/ielts/";
database = SQLiteDatabase.openOrCreateDatabase(destpath + "/md_book.db", null);
}
private boolean selectFavoriteState(){
#SuppressLint("Recycle") Cursor cursor = database.rawQuery("SELECT * FROM main WHERE id = " + id, null);
while (cursor.moveToNext()){
favoriteState = cursor.getString(cursor.getColumnIndex("fav"));
}
return favoriteState.equals("1");
}
private void updateFavorited(){
database.execSQL( "UPDATE main SET fav = 1 WHERE id = " + id);
}
private void updateUnfavorited(){
database.execSQL( "UPDATE main SET fav = 0 WHERE id = " + id);
}
}

In your FloatingActionButton onClick method after you save the new item in your database, insert your new item into your recyclerview datasource list and call notifyDatasetChanged() on the adapter.

Choice 1: in onResume() stub of MainActivity, call selectList() and selectFavorite() and then load the PageFragment again so that the new list is loaded properly.
This is the shortest wayout but this approach is very much unoptimized and is not recommended.
Choice 2: You will have to insert the new item in database as well as add it to the List and then call notifyDatasetChanged
In MainActivity within methods selectList() and selectFavorite() after you perform list.add(struct) and favourite.add(struct) respectively, you will have to call notifyDatasetChanged() for the Adapter.
But the problem is your RecyclerView is in the PageFragment whereas you're populating the list in MainActivity.
So move your selectList() and selectFavorite() to PageFragment where you first initialize the RecylerView then, set the Adapter and then populate the list and finally call notifyDatasetChanged() on your adapters.