Develop Reference

Get selected item position in Recyclerview

I am using Recyclerview. I added a menu with Recyclerview. I want to make a switch case in Recyclerview. So when I click on item 1, when I click on item 2, I click on step 3. When I click on my item .. I want to call a function. Currently I tried to read the position of the items with getAdapterPosition, but the output is always -1. For example, when I click on model, when I click on model2, I want to call a function.
Main2Activity
public class Main2Activity extends AppCompatActivity implements NavigationView.OnNavigationItemSelectedListener {
RecyclerView navRecyclerView;
LinearLayoutManager layoutManager;
ArrayList<NavigationDataModel> arrayList = new ArrayList<>();
NavigationAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
navigationView.setNavigationItemSelectedListener(this);
navRecyclerView = findViewById(R.id.navRecyclerView);
navRecyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
navRecyclerView.setLayoutManager(layoutManager);
DividerItemDecoration divider = new DividerItemDecoration(
navRecyclerView.getContext(),
DividerItemDecoration.VERTICAL
);
divider.setDrawable(ContextCompat.getDrawable(getBaseContext(), R.drawable.diveder_recycler));
navRecyclerView.addItemDecoration(divider);
initArray();
adapter = new NavigationAdapter(this, arrayList);
navRecyclerView.setAdapter(adapter);
private void initArray() {
NavigationDataModel model = new NavigationDataModel();
model.setIcon(R.mipmap.avatar);
model.setTitle("Hesabım");
arrayList.add(model);
NavigationDataModel model2 = new NavigationDataModel();
model2.setIcon(R.mipmap.sss3);
model2.setTitle("S.S.S");
arrayList.add(model2);
}
NavigationAdapter
public class NavigationAdapter extends RecyclerView.Adapter<NavigationAdapter.ViewHolder> {
Context context;
ArrayList<NavigationDataModel> arrayList = new ArrayList<>();
public NavigationAdapter(Context context, ArrayList<NavigationDataModel> arrayList) {
this.context = context;
this.arrayList = arrayList;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.navigationrecyclerview_adapter11, parent, false);
final ViewHolder holder = new ViewHolder(view);
holder.navTitle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
int position = holder.getAdapterPosition();
System.out.println("asdasdadasd" + position);
}
});
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.navIcon.setImageResource(arrayList.get(position).getIcon());
holder.navIconNew.setImageResource(arrayList.get(position).getIcon());
holder.rootView.setBackgroundColor(arrayList.get(position).getColor());
holder.navTitle.setText(arrayList.get(position).getTitle());
}
#Override
public int getItemCount() {
return arrayList.size();
}
public class ViewHolder extends RecyclerView.ViewHolder {
ImageView navIcon, navIconNew;
TextView navTitle;
LinearLayout rootView;
public ViewHolder(View itemView) {
super(itemView);
rootView = itemView.findViewById(R.id.rootView);
navIcon = itemView.findViewById(R.id.navIcon);
navIconNew = itemView.findViewById(R.id.navIconNew);
navTitle = itemView.findViewById(R.id.navTitle);
Toast.makeText(context, String.valueOf(getAdapterPosition()), Toast.LENGTH_SHORT).show();
}
}
}

#Override
public void onBindViewHolder(#NonNull ViewHolder holder, int position) {
holder.navIcon.setImageResource(arrayList.get(position).getIcon());
holder.navIconNew.setImageResource(arrayList.get(position).getIcon());
holder.rootView.setBackgroundColor(arrayList.get(position).getColor());
holder.navTitle.setText(arrayList.get(position).getTitle());
holder.navTitle.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
// use position herer
}
});
}

RecyclerView does not load images

I made a simple RecyclerView, but it do not load images!
Here are my codes. RecyclerView has 11 raws and each raw has 2 textviews and 1 imageview,
This is the important part of main activity,
MainActivity.java:
public class MainActivity extends AppCompatActivity {
RecyclerView recyclerView;
RecyclerView.Adapter adapter;
RecyclerView.LayoutManager layoutManager;
String[] F_Name, D_Name;
int[] Img_res = {R.drawable.a_beautiful_mind,
R.drawable.a_seperation,
R.drawable.casablanca,
R.drawable.daei_jan_napelon,
R.drawable.game_of_thrones,
R.drawable.life_of_pie,
R.drawable.the_dictator,
R.drawable.the_godfather,
R.drawable.the_martian,
R.drawable.the_revenant,
R.drawable.v_for_vendetta};
ArrayList<DataProvider> arrayList = new ArrayList<DataProvider>();
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
recyclerView = (RecyclerView) findViewById(R.id.myRecyclerView);
F_Name = getResources().getStringArray(R.array.Film_Names);
D_Name = getResources().getStringArray(R.array.Director_Names);
int i = 0;
for (String name : F_Name){
DataProvider dataProvider = new DataProvider(Img_res[i], name, D_Name[i]);
arrayList.add(dataProvider);
i++;
}
adapter = new RecyclerAdapter(arrayList);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(adapter);
}
}
Here is my Adapter, I added 11 raws, and each raw contains 2 textviews and 1 ImageView,
Adapter:
public class RecyclerAdapter extends RecyclerView.Adapter<RecyclerAdapter.RecyclerViewHolder> {
private ArrayList<DataProvider> arrayList = new ArrayList<DataProvider>();
public RecyclerAdapter(ArrayList<DataProvider> arrayList){
this.arrayList = arrayList;
}
#Override
public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_recyclerview_raws, parent, false);
RecyclerViewHolder recyclerViewHolder = new RecyclerViewHolder(view);
return recyclerViewHolder;
}
#Override
public void onBindViewHolder(RecyclerViewHolder holder, int position) {
DataProvider dataProvider = arrayList.get(position);
holder.imageView.setImageResource(dataProvider.getImg_res());
holder.f_name.setText(dataProvider.getF_name());
holder.d_name.setText(dataProvider.getD_name());
}
#Override
public int getItemCount() {
return arrayList.size();
}
public static class RecyclerViewHolder extends RecyclerView.ViewHolder{
ImageView imageView;
TextView f_name, d_name;
public RecyclerViewHolder(View view){
super(view);
imageView = (ImageView)view.findViewById(R.id.myRecyclerViewImage);
f_name = (TextView)view.findViewById(R.id.myTextVFilmName);
d_name = (TextView)view.findViewById(R.id.myTextVDirectorName);
}
}
}
Can anyone help me please?

How i can add List of items to my RecyclerView adapter

in onLoadFinsih i get back from the server List of movies i want to
add this list to my RecyclerView adapter
i tried to create List of movies and pass it to my RecyclerView adapter
then when i get the list of movies from the server in onLoadFinish method i add
this list to the list that i passed in the adapter then notify the adapter
but not working
public class MainActivity extends AppCompatActivity
implements LoaderManager.LoaderCallbacks<List<Movie>>{
private RecyclerView.Adapter movieRecyclerViewAdapter;
private RecyclerView.LayoutManager mLayoutManager;
private List<Movie> mListOfMovies;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
progressBar = (ProgressBar) findViewById(R.id.progress_bar);
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recycler_view);
mListOfMovies = new ArrayList<>();
movieRecyclerViewAdapter = new MovieItemAdapter(this, mListOfMovies);
mLayoutManager = new LinearLayoutManager(this);
recyclerView.setAdapter(movieRecyclerViewAdapter);
}
#Override
public void onLoadFinished(Loader<List<Movie>> loader, List<Movie> movies) {
//hide progress bar after fetch data from server
progressBar.setVisibility(View.GONE);
mListOfMovies.clear();
mListOfMovies.addAll(movies);
movieRecyclerViewAdapter.notifyItemRangeChanged();
}
public class MovieItemAdapter extends RecyclerView.Adapter<MovieItemAdapter.ViewHolder> {
private List<Movie> mListOfMovies;
private Context mContext;
public MovieItemAdapter(Context context, List<Movie> movies) {
this.mListOfMovies = movies;
this.mContext = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext)
.inflate(R.layout.movie_list_item, parent, false);
ViewHolder viewHolder = new ViewHolder(view);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder holder, int position) {
Movie movieItem = mListOfMovies.get(position);
holder.moviePoster.setImageBitmap(movieItem.getBitmap());
holder.movieName.setText(movieItem.getTitle());
DecimalFormat format = new DecimalFormat("0.0");
holder.voteAverage.setText(format.format(movieItem.getVoteAverage()));
holder.releaseDate.setText(movieItem.getReleaseDate());
}
#Override
public int getItemCount() {
return mListOfMovies.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public ImageView moviePoster;
public TextView movieName;
public TextView voteAverage;
public TextView releaseDate;
public ViewHolder(View itemView) {
super(itemView);
moviePoster = (ImageView) itemView.findViewById(R.id.movie_poster);
movieName = (TextView) itemView.findViewById(R.id.movie_name);
voteAverage = (TextView) itemView.findViewById(R.id.vote_average);
releaseDate = (TextView) itemView.findViewById(R.id.release_date);
}
}
}

In onLoadFinish() you should update the list in your adapter with the received data.
Then you should call the adapter's adapter.notifyDataSetChanged().
EDIT:
Create a method in adapter like
setMovieList(List<Movie> movies){
mListOfMovies = movies;
this.notifyDataSetChanged();
}
and call it from onLoadFinished():
movieRecyclerViewAdapter.setMovieList(mListOfMovies)

Make your ViewHolder class non static in adapter class. Then check again.

How can I implements OnItemClickListener on ListView

I have one android fragment that have a listView. Now I want implement onItemClickListener and show a Modal, if the user click on one item of ListView. Then, if I click on one items, I should to see a Modal with another listView. So with my code, if I try to click on one items, I can display the items of the last element of my principal listView, and it is not good.
This is my Fragment:
public class AlertsFragment extends Fragment {
private AlertAdapter pAdapter;
AlertXAgentAdapter agentAdapter;
AlertXReactionAdapter reactionAdapter;
private RecyclerView recyclerView,recyclerAgentView,recyclerReactionView;
private List<Alert> lista= new ArrayList<Alert>();
View v;
ExpandableListView expandableListView;
ExpandableListAdapter expandableListAdapter;
private static final int ARG_SECTION_NUMBER =6;
#Override
public void onAttach(Context context) {
super.onAttach(context);
((AndroidNavDrawerActivity) context).onSectionAttached(
ARG_SECTION_NUMBER);
}
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState) {
v=inflater.inflate(R.layout.alerts_activity, container, false);
recyclerView = (RecyclerView) v.findViewById(R.id.recycler_view);
//recupero la lista delle medication
AlertDAO manager = new AlertDAO(this.getContext());
lista = manager.getAlerts();
pAdapter = new AlertAdapter(lista, new AlertAdapter.OnItemClickListener() {
#Override
public void onItemClick(Alert item) {
try{
final Dialog dialog = new Dialog(v.getContext());
LayoutInflater inflater = LayoutInflater.from(v.getContext());
View dialogView = inflater.inflate(R.layout.alert_agent_reaction_modal, null);
//agent
recyclerAgentView = (RecyclerView) dialogView.findViewById(R.id.recycler_agent_view);
//reaction
recyclerReactionView = (RecyclerView) dialogView.findViewById(R.id.recycler_reaction_view);
dialog.setContentView(dialogView);
dialog.setTitle("Agent and Reaction");
//agent
agentAdapter = new AlertXAgentAdapter(item.getListaAgent());
//reaction
reactionAdapter = new AlertXReactionAdapter(item.getListaReaction());
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(v.getContext());
recyclerAgentView.setLayoutManager(mLayoutManager);
recyclerAgentView.setItemAnimator(new DefaultItemAnimator());
recyclerAgentView.setAdapter(agentAdapter);
RecyclerView.LayoutManager mLayoutManager2 = new LinearLayoutManager(v.getContext());
recyclerReactionView.setLayoutManager(mLayoutManager2);
recyclerReactionView.setItemAnimator(new DefaultItemAnimator());
recyclerReactionView.setAdapter(reactionAdapter);
dialog.show();
}catch(Exception e){
Log.e("","");
}
}
});
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(v.getContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(pAdapter);
/**
* Inflate the layout for this fragment
*/
return v;
}
}
This is my Adapter
public class AlertAdapter extends RecyclerView.Adapter<AlertAdapter.MyViewHolder> {
private List<Alert> list;
public Alert alert;
public OnItemClickListener listener;
public interface OnItemClickListener {
void onItemClick(Alert item);
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener {
public TextView startDate, endDate,description,status;
public MyViewHolder(View view) {
super(view);
startDate = (TextView) view.findViewById(R.id.startDate);
endDate = (TextView) view.findViewById(R.id.endDate);
description = (TextView) view.findViewById(R.id.description);
status = (TextView) view.findViewById(R.id.status);
view.setOnClickListener(this);
}
#Override
public void onClick(View v) {
if(listener != null){
listener.onItemClick(alert);
}
}
}
public AlertAdapter(List<Alert> list,OnItemClickListener listener) {
this.list = list;
this.listener=listener;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.alert_list_row, parent, false);
return new MyViewHolder(itemView);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
alert = list.get(position);
holder.startDate.setText(alert.getDateStart()!=null ? alert.getDateStart() : "");
holder.endDate.setText(alert.getDateEnd()!=null ? alert.getDateEnd() : "");
holder.description.setText(alert.getAlertInfo().getDisplayName());
//holder.type.setText(planOfCare.getDateEnd()!=null ? planOfCare.getDateEnd() : "");
holder.status.setText(alert.getAlarmAlertInfo().getDisplayName());
}
#Override
public int getItemCount() {
return list.size();
}
}

Your Alert variable is not getting assigned to proper object as you are assigning it in onBindViewHolder method. In your ViewHolder's onclick method try using this instead of passing the Alert variable
listener.onItemClick(list.get(this.getAdapterPosition()));

I think you should do something like this
public class AlertsFragment extends Fragment implements OnClickListener {
personRewardAdapter =new PersonRewardAdapter(PersonRewardSelectionActivity.this, Utilities.R_entities);
rewardList.setAdapter(personRewardAdapter);
rewardList.setOnclickListener(getActivity());
}
public void OnClick(){
}
do this in onCreateView. I am doing this in my code and maybe It helps you, so i am sharing to you

Android Studio, RecyclerView crashes my app on start up

I am battling with the android Recyclerviewer. I followed most tutorials and also read posts here on StackOverflow, but i am still not coming right.
MainActivity
public class MainActivity extends ActionBarActivity {
RecyclerView myrecyclerView;
MyAdapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
myrecyclerView = (RecyclerView)findViewById(R.id.myRecycleView);
adapter = new MyAdapter(MainActivity.this, getData());
final LinearLayoutManager layoutManager = new LinearLayoutManager(MainActivity.this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
myrecyclerView.setLayoutManager(layoutManager);
myrecyclerView.setAdapter(adapter);
myrecyclerView.setItemAnimator(new DefaultItemAnimator());
//
}
//the Dataset
public static List<MyDataModel> getData()
{
List<MyDataModel> myData = new ArrayList<>();
String[] postText = {"ibm", "apple", "google", "microsoft"};
int[] postImgUrl = {R.drawable.google, R.drawable.ibm, R.drawable.microsoft, R.drawable.apple};
for(int x=0; x<postText.length && x<postImgUrl.length; x++)
{
MyDataModel myModel = new MyDataModel();
myModel.postImgUrl = postImgUrl[x];
myModel.postText = postText[x];
myData.add(myModel);
}
return myData;
}
MyAdapter
public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{
List<MyDataModel> MyDataset;
private LayoutInflater inflater;
public MyAdapter(Context cont, List<MyDataModel> MyDataset)
{
inflater = LayoutInflater.from(cont);
}
public MyAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int ViewType)
{
//get ItemLayoutView from xml
View itemLayoutView = inflater.inflate(R.layout.my_items_row, parent, false);
//pass it to the ViewHolder
ViewHolder myViewHolder = new ViewHolder(itemLayoutView);
return myViewHolder;
}
public void onBindViewHolder(ViewHolder viewHolder, int position)
{
viewHolder.postText.setText(MyDataset.get(position).postText);
viewHolder.postImage.setImageResource(MyDataset.get(position).postImgUrl);
}
public int getItemCount()
{
return MyDataset.size();
}
public static class ViewHolder extends RecyclerView.ViewHolder
{
public TextView postText;
public ImageView postImage;
public ViewHolder(View v)
{
super(v);
postText = (TextView)v.findViewById(R.id.myPostText);
postImage = (ImageView)v.findViewById(R.id.myPostImage);
}
}
}
My model Data
public class MyDataModel {
String postText;
int postImgUrl;
}
I am testing on real device through android studio, other apps i that i am also testing are fine.
Please help thank you.

You didn't initialize MyDataset inside MyAdapter class