Develop Reference

Expandable Recycler view doesnt show my items

I want to use an expandableRecyler but when i use the adapter it doesnt work. It doesnt give me any error or anything. just doesnt appear on the screen
I have this Fragment where i call the recyclerView
public class RecFragment 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";
// TODO: Rename and change types of parameters
private String mParam1;
private String mParam2;
Button btaddrec;
Dialog alerta;
View v;
RecyclerView rvRec;
public RecFragment() {
// 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 RecFragment.
*/
// TODO: Rename and change types and number of parameters
public static RecFragment newInstance(String param1, String param2) {
RecFragment fragment = new RecFragment();
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);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
v = inflater.inflate(R.layout.fragment_rec, container, false);
rvRec = v.findViewById(R.id.recyclerviewRec);
btaddrec = (Button) v.findViewById(R.id.btaddRec);
initData();
setRecycler();
btaddrec.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Toast.makeText(getContext(), MainActivity.listarec.size() + "", Toast.LENGTH_SHORT).show();
}
});
return v;
}
private void setRecycler(){
RecyclerRec recyclerRec = new RecyclerRec(MainActivity.listarec);
rvRec.setLayoutManager(new LinearLayoutManager(getActivity()));
rvRec.setAdapter(recyclerRec);
rvRec.setHasFixedSize(true);
}
private void initData(){
MainActivity.listarec.add(new Recordatorio("Homework","Math and Science Homewowk","14:00"));
MainActivity.listarec.add(new Recordatorio("Homework","Math and Science Homewowk","14:00"));
}
}
Function initData add some objects to my list (i have checked that it works with the Button, my list has 2 items)
Function setRecycler set the adapter for the recyclerview
This is my class RecyclerRec
public class RecyclerRec extends RecyclerView.Adapter<RecyclerRec.RecVh>{
ArrayList<Recordatorio> listarec;
public RecyclerRec (ArrayList<Recordatorio> lista){
this.listarec = lista;
}
#NonNull
#Override
public RecVh onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.item_rec_layout,parent,false);
return new RecVh(v);
}
#Override
public void onBindViewHolder(#NonNull RecVh holder, int position) {
Recordatorio rec = listarec.get(position);
holder.tvTitulo.setText(rec.getTitulo());
holder.tvCuerpo.setText(rec.getCuerpo());
holder.tvHora.setText(rec.getHora());
boolean expanded = rec.isExpanded();
holder.expandable.setVisibility(expanded ? View.VISIBLE : View.GONE);
}
#Override
public int getItemCount() {
return listarec.size();
}
public class RecVh extends RecyclerView.ViewHolder {
TextView tvTitulo,tvCuerpo,tvHora;
LinearLayout linearLayout;
ConstraintLayout expandable;
public RecVh(#NonNull View itemView) {
super(itemView);
tvTitulo = itemView.findViewById(R.id.tvTituloRec);
tvCuerpo = itemView.findViewById(R.id.tvCuerpo);
tvHora = itemView.findViewById(R.id.tvHoraRec);
linearLayout = itemView.findViewById(R.id.linearlayotuexpand);
expandable = itemView.findViewById(R.id.expandableRec);
linearLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Recordatorio rec = listarec.get(getAdapterPosition());
rec.setExpanded(!rec.isExpanded());
notifyItemChanged(getAdapterPosition());
}
});
}
}
}
XML of fragment
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context=".Fragments.ClasesFragment">
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/recyclerviewRec"
android:layout_width="match_parent"
android:layout_height="451dp"
android:layout_marginTop="50dp" />
<Button
android:id="#+id/btaddRec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="160dp"
android:layout_marginTop="520dp"
android:text="Añadir" />
(Framelayout tag is closed correctly, dunno why stackoverflow doesnt write it with ctrl+k)
XML of my item/row
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
>
<TextView
android:id="#+id/tvTituloRec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="?attr/selectableItemBackground"
android:padding="10dp"
android:text="Titulo Recordatorio"
android:textAppearance="#style/TextAppearance.AppCompat.Medium"
android:textColor="#android:color/black"
android:textStyle="bold"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<TextView
android:id="#+id/tvHoraRec"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Hora"
android:textSize="17dp"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="1.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
<androidx.constraintlayout.widget.ConstraintLayout
android:id="#+id/expandableRec"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:visibility="visible"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.0"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toBottomOf="#id/tvTituloRec">
<TextView
android:id="#+id/tvCuerpo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginStart="8dp"
android:layout_marginLeft="8dp"
android:text="Cuerpo del recordatorio"
android:textAppearance="#style/TextAppearance.AppCompat.Small"
app:layout_constraintStart_toEndOf="#+id/textView"
app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.cardview.widget.CardView>
All seems to be in order but when i run the app it doesnt appear and doesnt give me any error.

RecyclerView does not show list of objects

I tried the solutions on the other similar posts that I found here but they did not help me. I hope someone can help.
I get data from Unsplash's API and the ArrayList contains 10 items once I get a response, that's why I think It has to be something with the way the view is inflated.
This is code:
public class MainActivity extends AppCompatActivity {
private static final String TAG = "unsplash";
private final String CLIENT_ID = "...myclientID...";
// testing keyword used on the API to search for pictures
private final String KEYWORD = "stackOverflow";
private final String urlBase = "https://api.unsplash.com/";
private Retrofit retrofit;
private RecyclerView recyclerView;
private RecyclerViewAdapter recyclerViewAdapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
retrofit = new Retrofit.Builder()
.baseUrl(urlBase)
.addConverterFactory(GsonConverterFactory.create())
.build();
recyclerView = findViewById(R.id.recyclerview);
recyclerView.setHasFixedSize(true);
GridLayoutManager layoutManager = new GridLayoutManager(this, 2);
recyclerView.setLayoutManager(layoutManager);
recyclerViewAdapter = new RecyclerViewAdapter();
recyclerView.setAdapter(recyclerViewAdapter);
getData();
}
private void getData() {
PictureService service = retrofit.create(PictureService.class);
Call<PictureResponse> pictureResponseCall = service.getPictureList(KEYWORD, CLIENT_ID);
pictureResponseCall.enqueue(new Callback<PictureResponse>() {
#Override
public void onResponse(Call<PictureResponse> call, Response<PictureResponse> response) {
if (response.isSuccessful()){
PictureResponse pictureResponse = response.body();
ArrayList<UnsplashPic> pictureList = pictureResponse.getResults();
recyclerViewAdapter.addPictures(pictureList);
}else{
Log.e (TAG, " onResponse " + response.errorBody());
}
}
#Override
public void onFailure(Call<PictureResponse> call, Throwable t) {
Log.e (TAG, " onFailure " + t.getMessage());
}
});
}
}
My adapter class:
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder> {
private ArrayList<UnsplashPic> pictureList;
public RecyclerViewAdapter (){
pictureList = new ArrayList<>();
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View view = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.item_view_holder, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder viewHolder, int i) {
UnsplashPic pic = pictureList.get(i);
viewHolder.artistName.setText(pic.user.getUsername());
viewHolder.unsplash.setText("Unsplash");
}
#Override
public int getItemCount() {
return pictureList.size();
}
public void addPictures(ArrayList<UnsplashPic> pictureList) {
pictureList.addAll(pictureList);
notifyDataSetChanged();
}
public class ViewHolder extends RecyclerView.ViewHolder {
private ImageView imageView;
private TextView artistName;
private TextView unsplash;
public ViewHolder (View itemView){
super(itemView);
imageView = itemView.findViewById(R.id.imageview);
artistName = itemView.findViewById(R.id.artist_name);
unsplash = itemView.findViewById(R.id.unsplash_name);
}
}
}
item_view_holder.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<ImageView
android:id="#+id/imageview"
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_gravity="center"
android:background="#ababab"
android:contentDescription="unsplash picture" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_gravity="center">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Photo by "/>
<TextView
android:id="#+id/artist_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true" />
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="on "/>
<TextView
android:id="#+id/unsplash_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:clickable="true"
android:focusable="true" />
</LinearLayout>
activity_main.xml
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<EditText
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:hint="Search for pictures"/>
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Search"/>
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/recyclerview">
</android.support.v7.widget.RecyclerView>
</LinearLayout>

Here:
public void addPictures(ArrayList<UnsplashPic> pictureList) {
pictureList.addAll(pictureList);
notifyDataSetChanged();
}
you are actually adding the content of the pictureList you send as parameter of the function to that same list, your list from adapter is not updated.
You should do like this instead:
public void addPictures(ArrayList<UnsplashPic> pictureList) {
this.pictureList.addAll(pictureList);
notifyDataSetChanged();
}

cardView in a RecyclerView is not showing any item

I am trying to make an App that has two tabs in a ViewPager and each tab are fragments and should have a card View in a RecyclerView.I fetch the data from an API added it in an ArrayList. I dont see any error in my Adapter class and DailyMenuFrag. I will appreciate any kind of help
DailyMenuFrag.java
public class DailyMenuFrag extends Fragment {
private List<DailyData> data_list;
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
data_list = new ArrayList<>();
load_data();
View view = inflater.inflate(R.layout.fragment_daily_menu, container, false);
RecyclerView recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view);
DailyDataAdapter adapter = new DailyDataAdapter(getActivity(), data_list);
LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getActivity());
recyclerView.setLayoutManager(linearLayoutManager);
recyclerView.setAdapter(adapter);
TextView textView = (TextView) view.findViewById(R.id.tt);
textView.setText("hellp");
return view;
}
public void load_data() {
task.execute("http://yemekapp.kuarkdijital.com.tr/home.php");
}
AsyncTask<String, Void, String> task = new AsyncTask<String, Void, String>() {
#Override
protected String doInBackground(String... params) {
URL url;
HttpURLConnection URLConnection = null;
String current = "";
try {
url = new URL(params[0]);
URLConnection = (HttpURLConnection) url.openConnection();
URLConnection.connect();
InputStream inputStream = URLConnection.getInputStream();
InputStreamReader reader = new InputStreamReader(inputStream);
int data = reader.read();
while (data != -1) {
current += (char) data;
data = reader.read();
}
JSONObject dailyObject = null;
JSONObject popularObject = null;
JSONObject jsonObject = new JSONObject(current);
JSONObject banner = jsonObject.getJSONObject("banner");
String daily = jsonObject.getString("daily");
String popular = jsonObject.getString("popular");
JSONArray dailyArray = new JSONArray(daily);
JSONArray popularArray = new JSONArray(popular);
for (int i = 0; i < dailyArray.length(); i++) {
dailyObject = dailyArray.getJSONObject(i);
popularObject = popularArray.getJSONObject(i);
DailyData singleData = new DailyData(dailyObject.getInt("id"), dailyObject.getString("Servings"), dailyObject.getString("Title"), dailyObject.getString("CookTime"), dailyObject.getString("Image"));
data_list.add(singleData);
Log.i("data", data_list.size() + "");
}
}
catch (JSONException e) {
e.printStackTrace();
}
catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return current;
}
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
}
};
}
DailyDataAdapter.java
public class DailyDataAdapter extends RecyclerView.Adapter<DailyDataAdapter.ViewHolder> {
Context context;
List<DailyData> dailyDataList;
public DailyDataAdapter(Context context, List<DailyData> dailyDatas) {
this.context = context;
this.dailyDataList = dailyDatas;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card,parent,false);
return new ViewHolder(itemView);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.title.setText(dailyDataList.get(position).getTitle());
holder.cookTime.setText(dailyDataList.get(position).getCookTime());
holder.servings.setText(dailyDataList.get(position).getServings());
//Image
Glide.with(context).load(dailyDataList.get(position).getImage_link()).into(holder.thumbnail);
}
#Override
public int getItemCount() {
return dailyDataList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
public TextView cookTime,servings,title;
public ImageView thumbnail;
public ViewHolder(View itemView) {
super(itemView);
title = (TextView) itemView.findViewById(R.id.title);
servings = (TextView) itemView.findViewById(R.id.servings);
cookTime = (TextView) itemView.findViewById(R.id.cooktime);
thumbnail = (ImageView) itemView.findViewById(R.id.thumbnail);
}
}
}
MainActivity.java
public class MainActivity extends AppCompatActivity {
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if(savedInstanceState == null){
ViewPagger viewPagger = new ViewPagger();
FragmentManager manager = getSupportFragmentManager();
FragmentTransaction transaction = manager.beginTransaction();
transaction.replace(R.id.fragment_container,viewPagger);
transaction.commit();
}
}
}
ViewPAgger.java
public class ViewPagger extends Fragment {
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_view_pagger,container,false);
ViewPager viewPager = (ViewPager) view.findViewById(R.id.view_pager);
TabLayout tabLayout = (TabLayout) view.findViewById(R.id.tab);
viewPager.setAdapter(new FragmentPagerAdapter(getChildFragmentManager()) {
#Override
public Fragment getItem(int position) {
return position == 0? new DailyMenuFrag():new PopularMenuFrag();
}
#Override
public int getCount() {
return 2;
}
#Override
public CharSequence getPageTitle(int position) {
return position == 0? "Daily":"Popular";
}
});
tabLayout.setupWithViewPager(viewPager);
return view;
}
}
ViewPagger.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nejat.yemektarifiproject.ViewPagger">
<android.support.design.widget.TabLayout
android:id="#+id/tab"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="40dp">
</android.support.design.widget.TabLayout>
<android.support.v4.view.ViewPager
android:id="#+id/view_pager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</FrameLayout>
card.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:card_view="http://schemas.android.com/tools">
<android.support.v7.widget.CardView
android:id="#+id/card_view"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center"
android:layout_margin="5dp"
android:elevation="3dp"
card_view:cardCornerRadius="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageView
android:id="#+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="160dp"
android:background="?attr/selectableItemBackgroundBorderless"
android:clickable="true"
android:scaleType="fitXY" />
<TextView
android:id="#+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/thumbnail"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:paddingTop="10dp"
android:textColor="#4c4c4c"
android:textSize="15dp" />
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/title"
android:orientation="horizontal">
<TextView
android:id="#+id/servings"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/title"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="10dp"
android:layout_weight="1"/>
<TextView
android:id="#+id/cooktime"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#id/title"
android:layout_weight="1"
android:paddingBottom="10dp"
android:paddingLeft="10dp"
android:paddingRight="10dp"
android:textSize="10dp" />
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
Fragment_DailyMenuFrag.xml
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="com.nejat.yemektarifiproject.DailyMenuFrag">
<android.support.v7.widget.RecyclerView
android:id="#+id/recycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="20dp"
>
</android.support.v7.widget.RecyclerView>
<TextView
android:id="#+id/tt"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
/>
</FrameLayout>

Add this
adapter.notifyDataSetChanged() in postExecute

I think you are forgetting to notify adapter about data change after you are getting data.
Declare your Adapter Global so you can call it from any where
DailyDataAdapter adapter = null;
and initialize it like this in your onCreateView
adapter = new DailyDataAdapter(getActivity(), data_list);
so call this notifyDataSetChanged() after doInBackground in your onPostExecute
#Override
protected void onPostExecute(String s) {
super.onPostExecute(s);
adapter.notifyDataSetChanged();
}
this should work for you.

CardView not appearing on RecyclerView

I am relatively new to android development and I have created an application that fetches data from the database(MySQL) and (should) display on a card loaded within a fragment in android. All my java classes do not show any errors but when I launch the application the card does not inflate within the RecyclerView.
The following are some of the solutions I have tried to no avail:
CardView not shown in RecyclerView,
Android MySQL Tutorial to Perform Basic CRUD Operation How to implement RecyclerView with CardView rows in a Fragment with TabLayout
Any help would be appreciated.
Fragment Containing the class I'm using:
public class bloodBanks extends Fragment {
private RecyclerView recylerView;
private MyAdapter adapter;
private List<MyData>data_List;
private OnFragmentInteractionListener mListener;
public bloodBanks() {
// 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 bloodBanks.
*/
// TODO: Rename and change types and number of parameters
public static bloodBanks newInstance(String param1, String param2) {
bloodBanks fragment = new bloodBanks();
Bundle args = new Bundle();
fragment.setArguments(args);
return fragment;
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View v= inflater.inflate(R.layout.fragment_blood_banks, container, false);
//perform(v);
recylerView=(RecyclerView) v.findViewById(R.id.recyle);
recylerView.setHasFixedSize(true);
data_List = new ArrayList<>();
adapter=new MyAdapter(getActivity(),data_List);
recylerView.setAdapter(adapter);
LinearLayoutManager llm = new LinearLayoutManager(getActivity());
llm.setOrientation(LinearLayoutManager.VERTICAL);
recylerView.setLayoutManager(llm);
load_data_from_server(0);
return v;
}
private void load_data_from_server(final int id) {
AsyncTask<Integer,Void,Void> task = new AsyncTask<Integer, Void, Void>() {
#Override
protected Void doInBackground(Integer... params) {
OkHttpClient client= new OkHttpClient();
Request request = new Request.Builder()
.url("http://192.168.137.1:81/card.php?id="+id)
.build();
try {
Response response = client.newCall(request).execute();
JSONArray array = new JSONArray(response.body().string());
for (int i=0;i<array.length();i++){
JSONObject object=array.getJSONObject(i);
MyData data=new MyData(object.getInt("id"),object.getString("hospName"),object.getString("contact"));
data_List.add(data);
}
} catch(IOException e){
e.printStackTrace();
}catch (JSONException e){
System.out.println("No More Hospitals");
}
return null;
}
#Override
protected void onPostExecute(Void aVoid) {
adapter.notifyDataSetChanged();
}
};
task.execute(id);
}
// 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;
}
/**
* 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);
}
}
My adapter Class:
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
private Context context;
private List<MyData> my_data;
public MyAdapter(Context context, List<MyData> my_data) {
this.context = context;
this.my_data = my_data;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.cards,parent,false);
return new ViewHolder(itemView);
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.hospName.setText(my_data.get(position).getHospName());
holder.contact.setText(my_data.get(position).getContact());
}
#Override
public int getItemCount() {
return my_data.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public TextView hospName;
public TextView contact;
public ViewHolder(View itemView){
super(itemView);
hospName=(TextView) itemView.findViewById(R.id.hosp);
contact=(TextView) itemView.findViewById(R.id.contact);
}
}
}
Data definitions:
public class MyData {
private int id;
private String hospName,contact;
public MyData(int id, String hospName, String contact) {
this.id = id;
this.hospName = hospName;
this.contact = contact;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getHospName() {
return hospName;
}
public void setHospName(String hospName) {
this.hospName = hospName;
}
public String getContact() {
return contact;
}
public void setContact(String contact) {
this.contact = contact;
}
}
Cards.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.CardView
android:id="#+id/cdBanks"
android:layout_width="329dp"
android:layout_height="137dp"
android:layout_marginBottom="8dp"
android:layout_marginEnd="8dp"
android:layout_marginRight="8dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.022"
android:layout_marginLeft="8dp"
app:layout_constraintLeft_toLeftOf="parent">
<RelativeLayout
android:layout_width="337dp"
android:layout_height="wrap_content">
<ImageView
android:id="#+id/hospPhoto"
android:layout_width="148dp"
android:layout_height="wrap_content"
android:src="#drawable/contacts_icon" />
<TextView
android:id="#+id/hosp"
android:layout_width="195dp"
android:layout_height="wrap_content"
android:layout_toRightOf="#+id/hospPhoto"
android:textSize="26sp"
tools:layout_editor_absoluteX="256dp"
tools:layout_editor_absoluteY="16dp" />
<TextView
android:id="#+id/contact"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/hosp"
android:layout_toRightOf="#+id/hospPhoto" />
<TextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="#+id/contact"
android:layout_toRightOf="#+id/hospPhoto"
android:text="Blood Units: " />
</RelativeLayout>
</android.support.v7.widget.CardView>
</LinearLayout>
fragment_blood_banks.xml
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card_view="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
card_view:context="layout.bloodBanks">
<android.support.v7.widget.RecyclerView
android:id="#+id/recyle"
android:layout_width="match_parent"
android:layout_height="wrap_content"
card_view:cardUSeCompatPadding="true"
card_view:cardElevation="5dp"
card_view:cardCornerRadius="5dp"
android:scrollbars="vertical"
android:layout_marginRight="6dp"
android:layout_marginLeft="6dp"
android:layout_marginTop="6dp"
/>
</android.support.constraint.ConstraintLayout>

In adapter's xml put your whole layout in CardView....
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.v7.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_marginBottom="5dp"
android:layout_marginLeft="10dp"
android:layout_marginTop="10dp"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:background="#color/color"
android:id="#+id/cv1"
card_view:cardElevation="3.5dp"
card_view:cardBackgroundColor="#fff"
card_view:cardCornerRadius="3dp"
android:foreground="?android:attr/selectableItemBackground"
xmlns:android="http://schemas.android.com/apk/res/android">
<put your whole layout here....>
</android.support.v7.widget.CardView>
</LinearLayout>

Passing data from Recycler view onClick to Detail Activity with android databinding

I am having a list of items populating through recyclerview with android databinding technique and now I want to pass and populate the same data in detail Activity not getting the right thing to do such. So, kindly help to do this.
public class Fragment extends Fragment {
private FirebaseRecyclerAdapter adapter;
private Firebase mFirebaseRef = new Firebase("https://xyz.firebaseio.com/category/").child("list");
public Fragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View rootView = inflater.inflate(R.layout.recycler_view, container, false);
final RecyclerView recyclerView = (RecyclerView) rootView.findViewById(R.id.recycler_view);
adapter = new FirebaseRecyclerAdapter<List, ViewHolder>List.class, R.layout.fragment,
ViewHolder.class, mFirebaseRef) {
#Override
protected void populateViewHolder(ViewHolder viewHolder, List list, int i) {
FragmentBinding binding = viewHolder.getBinding();
binding.setList(list);
}
};
recyclerView.setAdapter(adapter);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.addItemDecoration(new DividerItemDecoration(getActivity(), null));
return rootView;
}
public static class ViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public FragmentBinding binding;
public ViewHolder(View itemView) {
super(itemView);
binding = DataBindingUtil.bind(itemView);
itemView.setOnClickListener(this);
}
public FragmentBinding getBinding() {
return binding;
}
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailedActivity.class);
**// need help here**
v.getContext().startActivity(intent);
}
}
#BindingAdapter("quantity")
public static void setQuantityText(TextView view, int quantity) {
view.setText(String.valueOf(quantity));
}
public static class Handlers {
public static void increment(View view, int max) {
FragmentBinding binding = DataBindingUtil.findBinding(view);
binding.setQuantity(Math.max(max, binding.getQuantity() + 1));
}
public static void decrement(View view, int min) {
FragmentBinding binding = DataBindingUtil.findBinding(view);
binding.setQuantity(Math.min(min, binding.getQuantity() - 1));
}
}
}
<layout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto">
<data>
<variable
name="List"
type="com.xyz.www.android.model.List"/>
<variable
name="quantity"
type="int"/>
<variable
name="Handlers"
type="com.xyz.www.android.ui.fragments.Fragment.Handlers"/>
</data>
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingStart="#dimen/activity_horizontal_margin"
android:paddingEnd="#dimen/activity_horizontal_margin"
android:paddingTop="8dp">
<ImageView
android:layout_width="76dp"
android:layout_height="76dp"
android:contentDescription="#string/content_description"
app:imageUrl="#{List.productImageUrl}"
android:padding="8dp"
android:layout_gravity="center_horizontal|bottom"
android:layout_marginTop="8dp" />
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="vertical"
android:padding="8dp"
android:layout_alignParentTop="true"
android:layout_alignParentStart="true"
android:layout_marginStart="72dp">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{List.productTitle}"
android:textSize="16sp"
android:textColor="#android:color/primary_text_light"
app:font="#{`Roboto-Regular.ttf`}"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{List.productSku}"
android:textSize="13sp"
android:paddingTop="8dp"
app:font="#{`Roboto-Regular.ttf`}"/>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/Rs"
android:textSize="14sp"
android:paddingTop="8dp"
android:paddingEnd="2dp"
android:paddingStart="2dp"
app:font="#{`Roboto-Regular.ttf`}"/>
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#{List.productSellingPrice}"
android:textSize="14sp"
android:paddingTop="8dp"
android:paddingStart="2dp"
android:paddingEnd="2dp"
android:textColor="#android:color/primary_text_light"
app:font="#{`Roboto-Regular.ttf`}"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:layout_alignParentEnd="true"
android:paddingTop="16dp"
android:paddingBottom="16dp">
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/decrease" />
<TextView
android:layout_width="32dp"
android:layout_height="wrap_content"
app:font="#{`Roboto-Regular.ttf`}"
app:quantity="#{quantity}"
android:textAlignment="center" />
<Button
style="?android:attr/buttonStyleSmall"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="#string/increase" />
</LinearLayout>
</RelativeLayout>
#JsonIgnoreProperties(ignoreUnknown=true)
public class List extends BaseObservable {
String productTitle;
String productSku;
String productImageUrl;
String productDescription;
String productMrp;
String productSellingPrice;
public List() {
}
public List(String productTitle, String productSku,
String productImageUrl, String productDescription,
String productMrp, String productSellingPrice) {
this.productTitle = productTitle;
this.productSku = productSku;
this.productImageUrl = productImageUrl;
this.productDescription = productDescription;
this.productMrp = productMrp;
this.productSellingPrice = productSellingPrice;
}
#Bindable
public String getProductTitle() {
return productTitle;
}
#Bindable
public String getProductSku() {
return productSku;
}
#Bindable
public String getProductImageUrl() {
return productImageUrl;
}
#Bindable
public String getProductDescription() {
return productDescription;
}
#Bindable
public String getProductMrp() {
return productMrp;
}
#Bindable
public String getProductSellingPrice() {
return productSellingPrice;
}

There are a few ways to do this. One is to make List Parcelable so that you can pass it as an Intent extra. You'll then be able to extract it and populate the Detail page.
public static final LIST = "ListContent";
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailedActivity.class);
FragmentBinding binding = DataBindingUtil.findBinding(v);
intent.putExtra(LIST, binding.getList());
v.getContext().startActivity(intent);
}
Another is to pass only the ID for the List and read the information again in the detail binding. Add the ID to the List and then you'll be able to extract it when you start the activity:
public static final LIST_ID = "ListID";
#Override
public void onClick(View v) {
Intent intent = new Intent(v.getContext(), DetailedActivity.class);
FragmentBinding binding = DataBindingUtil.findBinding(v);
intent.putExtra(LIST_ID, binding.getList().getId());
v.getContext().startActivity(intent);
}
Either way, you can pull the data from the intent in the onCreate of your details Activity:
public void onCreate(...) {
Intent intent = getIntent();
// Using ID:
int id = intent.getIntExtra(LIST_ID);
List list = loadListFromId(id);
// Using Parcelable:
List list = intent.getParcelableExtra(LIST);
//...
}