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Changing ImageView of selected item in recyclerview in many time

I'm trying to change an ImageView in my RecyclerView. I need to change ImageView every time I click the RecyclerView. So, when I click it once it changes to a tick, then I click it again it changes again to be like the beginning, and when I click it again I want to bring up the tick like when I pressed it the first time.
public class RecyclerViewAdapter1 extends RecyclerView.Adapter<RecyclerViewAdapter1.ViewHolder> {
private LayoutInflater inflater;
private FragmentCommunication mCommunicator;
private static String LOG_TAG = "MyRecyclerViewAdapter";
private ArrayList<String> arrayList;
private ArrayList<Integer> IDList;
private ArrayList<Integer> polikhusus;
private int tekan = 0;
private GlobalClass globalVariable;
private static int lastClickedPosition = -1;// Variable to store the last clicked item position
RecyclerViewAdapter1(ArrayList<String> pintuMasuk, ArrayList<Integer> PoliID, ArrayList<Integer> poli, OnTextClickListener listener) {
this.arrayList = pintuMasuk;
this.IDList = PoliID;
this.polikhusus = poli;
this.mListener = listener;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View V = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_poli_design, parent, false);
ViewHolder VH = new ViewHolder(V);
return VH;
}
public class ViewHolder extends RecyclerView.ViewHolder {
private TextView PintuMasuk;
private ImageView Meme2;
private RelativeLayout ItemList3;
private int selectedIndex;
private Integer PoliID;
public ViewHolder(View itemView) {
super(itemView);
PintuMasuk = itemView.findViewById(R.id.poli);
Meme2 = itemView.findViewById(R.id.gbpoli);
ItemList3 = itemView.findViewById(R.id.item_list3);
}
}
#Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
final String PintuMasuk = arrayList.get(position);
final Integer PoliID = IDList.get(position);
final Integer poli = polikhusus.get(position);
holder.PintuMasuk.setText(PintuMasuk);
holder.ItemList3.setTag(position);
holder.Meme2.setImageResource(R.drawable.pintumasuk);
holder.ItemList3.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
globalVariable = (GlobalClass) view.getContext().getApplicationContext();
globalVariable.PoliID = PoliID;
if(position != lastClickedPosition){
holder.Meme2.setImageResource(R.drawable.policheck);
Snackbar.make(view, "Anda memilih : "+PoliID+" "+PintuMasuk, Snackbar.LENGTH_SHORT).show();
Log.i(LOG_TAG," Clicked on Item " + position);
}else {
// for cancel
Snackbar.make(view, "Anda membatalkan pilihan Anda", Snackbar.LENGTH_SHORT).show();
globalVariable.PoliID = 0;
}
if (lastClickedPosition != -1)
notifyItemChanged(lastClickedPosition);
lastClickedPosition = position;
}
});
}
#Override
public int getItemCount () {
return this.arrayList.size();
}
}
enter image description here

RecyclerView: different ViewType by different button

I have a recycler view to show an activity timeline and three floating buttons that click to add activity. How can I code three buttons to a different view? How can I pass the condition to the Adapter?
Now I can show only one viewType.
thx a lot.
Adapter.java
public class TripAdapter extends RecyclerView.Adapter<TripAdapter.TripHolder> {
private List<Trip> trips = new ArrayList<>();
private OnItemClickListener listener;
#NonNull
#Override
public TripHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext()).inflate(R.layout.trip_item, parent, false);
return new TripHolder(itemView);
}
#Override
public void onBindViewHolder(#NonNull TripHolder holder, int position) {
Trip currentTrip = trips.get(position);
holder.textViewLodgingTitle.setText(currentTrip.getLodgingTitle());
holder.textTextViewLodgingCheckInDateTime.setText(currentTrip.getLodgingCheckInDateTime());
holder.textTextViewLodgingCheckOutDateTime.setText(currentTrip.getLodgingCheckOutDateTime());
holder.textViewLodgingAddress.setText(currentTrip.getLodgingAddress());
}
#Override
public int getItemCount() {
return trips.size();
}
public void setTrips(List<Trip> trips) {
this.trips = trips;
notifyDataSetChanged();
}
public Trip getTripAt(int position) {
return trips.get(position);
}
class TripHolder extends RecyclerView.ViewHolder {
//lodging
private TextView textViewLodgingTitle;
private TextView textTextViewLodgingCheckInDateTime;
private TextView textTextViewLodgingCheckOutDateTime;
private TextView textViewLodgingAddress;
private TextView textViewLodgingPhone;
private TextView textViewLodgingWebsite;
private TextView textViewLodgingEmail;
public TripHolder(#NonNull View itemView) {
super(itemView);
context = itemView.getContext();
textViewLodgingTitle = itemView.findViewById(R.id.text_view_title);
textTextViewLodgingCheckInDateTime = itemView.findViewById(R.id.text_view_start_date_time);
textTextViewLodgingCheckOutDateTime = itemView.findViewById(R.id.text_view_end_date_time);
textViewLodgingAddress = itemView.findViewById(R.id.text_view_description);
itemView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
int position = getAdapterPosition();
if (listener != null && position != RecyclerView.NO_POSITION) {
listener.onItemClick(trips.get(position));
}
}
});
}
}
public interface OnItemClickListener {
void onItemClick(Trip trip);
}
public void setOnItemClickListener(OnItemClickListener listener) {
this.listener = listener;
}
}
MainActivity.java
//adapter
RecyclerView recyclerView = findViewById(R.id.recycler_view);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
final TripAdapter adapter = new TripAdapter();
recyclerView.setAdapter(adapter );
tripViewModel = new ViewModelProvider(this, ViewModelProvider.AndroidViewModelFactory.getInstance(this.getApplication())).get(TripViewModel.class);
tripViewModel.getAllTrips().observe(this, new Observer<List<Trip>>() {
#Override
public void onChanged(#Nullable List<Trip> trips) {
adapter.setTrips(trips);
}
});
//this on onActivityResult()
else if (requestCode == ADD_LODGING && resultCode == Activity.RESULT_OK) {
//get data from lodging activity
String lodgingTitle = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_TITLE);
String lodgingCheckInDateTime = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_CHECK_IN_DATE_TIME);
String lodgingCheckOutDateTime = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_CHECK_OUT_DATE_TIME);
String lodgingDescription = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_DESCRIPTION);
String lodgingAddress = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_ADDRESS);
String lodgingPhone = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_PHONE);
String lodgingWebsite = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_WEBSITE);
String lodgingEmail = data.getStringExtra(LodgingEditActivity.EXTRA_LODGING_EMAIL);
String lodgingImagePath = "test";
Trip lodging = new Trip(lodgingTitle, lodgingCheckInDateTime, lodgingCheckOutDateTime,lodgingDescription, lodgingAddress, lodgingPhone, lodgingWebsite, lodgingEmail,lodgingImagePath);
tripViewModel.insert(lodging);
Toast.makeText(this, "lodging save", Toast.LENGTH_SHORT).show();
}
My application I adapt from codinginflow channel.
https://codinginflow.com/tutorials/android/room-viewmodel-livedata-recyclerview-mvvm/part-1-introduction

Can't get int or double to display on RecyclerView after parsing json

When I just display string data it seems to show up fine, but when I try to display an int or double the RecyclerView won't populate. I am pulling from the Google places API JSON. I think maybe it is the way I'm using my onBindViewHolder()? Thanks
// MainActivity
private void getJson() {
String URL = https://maps.googleapis.com/maps/api/place/nearbysearch/json?location=40.7085,-74.003124&opennow&radius=5000&type=restaurant&key=
JsonObjectRequest root = new JsonObjectRequest(Request.Method.GET, URL, null, new Response.Listener<JSONObject>() {
#Override
public void onResponse(JSONObject response) {
try {
JSONArray results = response.getJSONArray("results");
Log.d("RESULTS", String.valueOf(results));
for(int i = 0; i<results.length(); i++) {
JSONObject resultsObj = results.getJSONObject(i);
mImageUrls.add(resultsObj.getString("icon"));
mTitle.add(resultsObj.getString("name"));
//mRating.add(resultsObj.getDouble("rating"));
mPriceLevel.add(resultsObj.getInt("price_level"));
}
getRecyclerView();
} catch (JSONException e) {
e.printStackTrace();
}
}
},new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError error) {
}
});
mRequestQueue.add(root);
}
private void getRecyclerView() {
// LinearLayoutManager
recyclerView = findViewById(R.id.recyclerView);
adapter = new RecyclerViewAdapter(mImageUrls, mTitle, mPriceLevel, this);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(this));
recyclerView.setHasFixedSize(true);
}
And the RecyclerViewAdapter Class is.
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
private static final String TAG = "RecyclerViewAdapter";
private ArrayList<String> rNames = new ArrayList<>();
private ArrayList<String> rImageUrls = new ArrayList<>();
private ArrayList<Double> rRatings = new ArrayList<>();
private ArrayList<Integer> rPriceLevel = new ArrayList<>();
private Context mContext;
public RecyclerViewAdapter(ArrayList<String> image, ArrayList<String> name, ArrayList<Integer> priceLevel, Context context) {//, ArrayList<Double> rating
this.rImageUrls = image;
this.rNames = name;
//this.rRatings = rating;
this.rPriceLevel = priceLevel;
mContext = context;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false);
ViewHolder holder = new ViewHolder(view);
return holder;
//return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, final int position) {
Glide.with(mContext).asBitmap().load(rImageUrls.get(position)).into(holder.image);
holder.name.setText(rNames.get(position));
//holder.rating.setText(rRatings.get(position));
holder.priceLevel.setText(rPriceLevel.get(position));
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked on an image: " + rNames.get(position));
Toast.makeText(mContext, rNames.get(position), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return rNames.size(); //we can use rImageUrls/rRatings as well because they are all the same size
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView name;
TextView rating;
TextView priceLevel;
TextView address;
RelativeLayout parentLayout;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
name = (TextView) itemView.findViewById(R.id.title);
//rating = itemView.findViewById(R.id.rating);
priceLevel = (TextView) itemView.findViewById(R.id.priceLevel);
parentLayout = itemView.findViewById(R.id.parentLayout);
}
}
}

The reason for this is you are not converting Double to String
change this line holder.rating.setText(rRatings.get(position)); to holder.rating.setText(String.valueOf(rRatings.get(position)));

I would like to suggest you to create an object having all necessary parameters in it and then pass a single list of that object to the RecyclerViewAdapter.
public class MapElement {
public String name;
public String imageUrl;
public Double rating;
public Integer price;
}
Then create an ArrayList of this object when you get the response from your getJson function call. Now in your adapter just use a single list of MapElement object to show the data from there.
The modified adapter should look like this.
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewAdapter.ViewHolder>{
private static final String TAG = "RecyclerViewAdapter";
private ArrayList<MapElement> elements = new ArrayList<>();
private Context mContext;
public RecyclerViewAdapter(ArrayList<MapElement> elements, Context context) {
this.elements = elements;
mContext = context;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.layout_item, parent, false);
ViewHolder holder = new ViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, final int position) {
Glide.with(mContext).asBitmap().load(rImageUrls.get(position)).into(holder.image);
holder.name.setText(elements.get(position).name);
holder.rating.setText(elements.get(position).rating);
holder.priceLevel.setText(elements.get(position).price);
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
Log.d(TAG, "onClick: clicked on an image: " + rNames.get(position));
Toast.makeText(mContext, elements.get(position).name, Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return elements.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView image;
TextView name;
TextView rating;
TextView priceLevel;
TextView address;
RelativeLayout parentLayout;
public ViewHolder(View itemView) {
super(itemView);
image = (ImageView) itemView.findViewById(R.id.image);
name = (TextView) itemView.findViewById(R.id.title);
rating = itemView.findViewById(R.id.rating);
priceLevel = (TextView) itemView.findViewById(R.id.priceLevel);
parentLayout = itemView.findViewById(R.id.parentLayout);
}
}
}

First you should check that the rating you are getting is a double value.
It might be the case that an exception is thrown after this line
mRating.add(resultsObj.getDouble("rating"))
Also as #hooray_todd siggested textview only takes string value so you have to change your data into string.

get and set global variables from CustomListViewAdapter

Am looking to create a fragment conaining listview by retriveing data from firebase database.This listview gets cards having buttons and seekbar. All I want is to have a global variable listen to these buttons. I tried creating onClicklistener in the fragment itself but wasn't successful.Then I created onClicklistener for these buttons on the Adapter itself which was working. Now when I use the buttonclick to create a Toast, the Toast string is coming up as I expect. But the problem is that I want this Toasted string to store somewhere like global variable so that I could use it in another fragment as well. So I used:
String alpha = ((MyApplication) getContext()).getCartitem();
((MyApplication)getContext()).setCartitem("XYZ");
inside my adapter class's on Click Listener itself but the application crashes showing error log "First cannot be cast to com.fastfrooot.fastfrooot.MyApplication". First being my Activity containing Fragment and MyApplication is the class extending application.
MyApplication.java
package com.fastfrooot.fastfrooot;
import android.app.Application;
import android.widget.Button;
public class MyApplication extends Application {
private boolean[] cartsitem = {
false,
false,
false,
false,
false,
false
};
private String orderitem;
private String pkname;
private boolean oncomp = false;
private Button[] cartbuttons = new Button[20];
private String cartitem = "Alpha";
public boolean[] getcartsitem() {
return cartsitem;
}
public void setcartsitem(boolean[] cartsitem) {
this.cartsitem = cartsitem;
}
public String getorderitem() {
return orderitem;
}
public void setorderitem(String orderitem) {
this.orderitem = orderitem;
}
public String getpkname() {
return pkname;
}
public void setpkname(String pkname) {
this.pkname = pkname;
}
public boolean getoncomp() {
return oncomp;
}
public void setoncomp(boolean oncomp) {
this.oncomp = oncomp;
}
public Button[] getcartbuttons() {
return cartbuttons;
}
public void setCartbuttons(Button[] cartbuttons) {
this.cartbuttons = cartbuttons;
}
public String getCartitem() {
return cartitem;
}
public void setCartitem(String cartitem) {
this.cartitem = cartitem;
}
}
public class CustomListAdapterfir extends ArrayAdapter < Cardfir > {
private static final String TAG = "CustomListAdapter";
private Context mContext;
private int mResource;
private int lastPosition = -1;
private int procount;
String Cartkeitem;
private static class ViewHolder {
TextView title;
ImageView image;
TextView Status;
Button cartbutton;
SeekBar seekbar;
}
public CustomListAdapterfir(Context context, int resource, List < Cardfir > objects) {
super(context, resource, objects);
mContext = context;
mResource = resource;
//sets up the image loader library
setupImageLoader();
}
#NonNull
#Override
public View getView(int position, View convertView, ViewGroup parent) {
//get the persons information
final String title = getItem(position).getTitle();
String imgUrl = getItem(position).getImgURL();
final String Status = getItem(position).getStatus();
Button cartbutton = getItem(position).getCartbutton();
final SeekBar seekBar = getItem(position).getSeekbar();
try {
//create the view result for showing the animation
final View result;
//ViewHolder object
final ViewHolder holder;
if (convertView == null) {
LayoutInflater inflater = LayoutInflater.from(mContext);
convertView = inflater.inflate(mResource, parent, false);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.cardTitle);
holder.Status = (TextView) convertView.findViewById(R.id.cardstat);
holder.image = (ImageView) convertView.findViewById(R.id.cardImage);
holder.seekbar = (SeekBar) convertView.findViewById(R.id.seekBarf);
holder.cartbutton = (Button) convertView.findViewById(R.id.Addbutton);
result = convertView;
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
result = convertView;
}
lastPosition = position;
holder.title.setText(title);
holder.Status.setText(Status);
holder.cartbutton.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
int seekerpos = holder.seekbar.getProgress() + 1;
Cartkeitem = title + " " + String.valueOf(seekerpos);
Toast.makeText(mContext, Cartkeitem, Toast.LENGTH_SHORT).show();
String alpha = ((MyApplication) getContext()).getCartitem();
((MyApplication) getContext()).setCartitem("XYZ");
}
});
holder.seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
#Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
}
#Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
#Override
public void onStopTrackingTouch(SeekBar seekBar) {
}
});
//create the imageloader object
ImageLoader imageLoader = ImageLoader.getInstance();
int defaultImage = mContext.getResources().getIdentifier("#drawable/logo", null, mContext.getPackageName());
DisplayImageOptions options = new DisplayImageOptions.Builder().cacheInMemory(true)
.cacheOnDisc(true).resetViewBeforeLoading(true)
.showImageForEmptyUri(defaultImage)
.showImageOnFail(defaultImage)
.showImageOnLoading(defaultImage).build();
imageLoader.displayImage(imgUrl, holder.image, options);
return convertView;
} catch (IllegalArgumentException e) {
Log.e(TAG, "getView: IllegalArgumentException: " + e.getMessage());
return convertView;
}
}
private void setupImageLoader() {
DisplayImageOptions defaultOptions = new DisplayImageOptions.Builder()
.cacheOnDisc(true).cacheInMemory(true)
.imageScaleType(ImageScaleType.EXACTLY)
.displayer(new FadeInBitmapDisplayer(300)).build();
ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(
mContext)
.defaultDisplayImageOptions(defaultOptions)
.memoryCache(new WeakMemoryCache())
.discCacheSize(100 * 1024 * 1024).build();
ImageLoader.getInstance().init(config);
}
}
public class Tab1fragment extends Fragment implements View.OnClickListener {
private static final String TAG = "TAG1 fragment";
private ListView mListView;
DatabaseReference Complete = FirebaseDatabase.getInstance().getReference();
DatabaseReference Products = Complete.child("Products");
ValueEventListener productlistener;
final ArrayList < Cardfir > list = new ArrayList < Cardfir > ();
String productname;
String producttype;
final ArrayList < Button > Cartbuttons = new ArrayList < Button > ();
final ArrayList < SeekBar > Seekbars = new ArrayList < SeekBar > ();
int productnumber = -1;
Button[] Cartsbut = new Button[20];
#Nullable
#Override
public View onCreateView(LayoutInflater inflater, #Nullable ViewGroup container, #Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.tab1_fragment, container, false);
mListView = (ListView) view.findViewById(R.id.listview);
productlistener = Products.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
for (final DataSnapshot delphi: dataSnapshot.getChildren()) {
productnumber = productnumber + 1;
productname = delphi.child("Name").getValue().toString();
producttype = delphi.child("Type").getValue().toString();
list.add(new Cardfir("drawable://" + R.drawable.trans, productname, producttype));
}
CustomListAdapterfir adapter = new CustomListAdapterfir(getActivity(), R.layout.card_layout_liveorder, list);
mListView.setAdapter(adapter);
Products.removeEventListener(productlistener);
}
#Override
public void onCancelled(DatabaseError databaseError) {
}
});
return view;
}
#Override
public void onClick(View view) {
Toast.makeText(getContext(), "HI", Toast.LENGTH_SHORT).show();
}
}

SectionedRecyclerView over Write first item

I'm Trying to use : SimpleSectionedRecyclerViewAdapter , i have arrayList that have 30 elements with strings , i'm going to group every 10 elements with header Title ,
first item should be "Item0" with header name "First 10 elements start"
but when doing that i get :
"First 10 elements start" // header titile
"Item1" <---! note : it should "Item0"
so where is index number 0 gone?
//adapter.addItem3(CategoriesList.get(0));
List<SimpleSectionedRecyclerViewAdapter.Section> sections =
new ArrayList<SimpleSectionedRecyclerViewAdapter.Section>();
sections.add(new SimpleSectionedRecyclerViewAdapter.Section(0, "First 10 elements start"));
//Add your adapter to the sectionAdapter
SimpleSectionedRecyclerViewAdapter.Section[] dummy = new SimpleSectionedRecyclerViewAdapter.Section[sections.size()];
SimpleSectionedRecyclerViewAdapter mSectionedAdapter = new
SimpleSectionedRecyclerViewAdapter(activity, R.layout.drawer_header_book, R.id.headerName, adapter);
mSectionedAdapter.setSections(sections.toArray(dummy));
mDrawerList.setLayoutManager(new LinearLayoutManager(activity));
mDrawerList.setAdapter(mSectionedAdapter);
I'm using exactly as adapter :
https://gist.github.com/gabrielemariotti/4c189fb1124df4556058
public class DrawerItemCustomAdapterForAllBooks extends RecyclerView.Adapter<DrawerItemCustomAdapterForAllBooks.SimpleViewHolder> {
private final Context context;
Typeface custom_font;
ArrayList<Categories> mData;
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 0;
private static final int TYPE_SEPARATOR = 1;
int BookID;
public void add(Categories s,int position) {
position = position == -1 ? getItemCount() : position;
mData.add(position,s);
notifyItemInserted(position);
}
public void remove(int position){
if (position < getItemCount() ) {
mData.remove(position);
notifyItemRemoved(position);
}
}
public DrawerItemCustomAdapterForAllBooks(Context context, ArrayList<Categories> Categories2, int BookID) {
this.mData = Categories2;
this.context = context;
this.BookID = BookID;
custom_font = Typeface.createFromAsset(context.getAssets(), "fonts/HelveticaNeueLTArabic-Light.ttf");
}
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(context).inflate(R.layout.listview_item_row, parent, false);
return new SimpleViewHolder(view);
}
#Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {
if (holder != null) {
final Categories currentItem = getItem(holder.getAdapterPosition());
SimpleViewHolder genericViewHolder = (SimpleViewHolder) holder;
genericViewHolder.position = holder.getAdapterPosition();
genericViewHolder.CategoryName.setText(currentItem.getName());
genericViewHolder.CategoryName.setTypeface(custom_font);
genericViewHolder.CategoryName.setTag(holder.getAdapterPosition());
genericViewHolder.itemView.setTag(holder.getAdapterPosition());
if (currentItem.getBookID() == 1) {
genericViewHolder.CategoryName.setTextColor(context.getResources().getColor(R.color.nokhba_white));
genericViewHolder.itemView.setBackgroundColor(context.getResources().getColor(R.color.nokhba_darkrose));
Picasso.with(context).load(R.drawable.list_icon_e02)
.error(R.drawable.no_internet)
.tag(context)
.placeholder(R.drawable.no_spic)
.into(genericViewHolder.CategoryImage);
} else if (currentItem.getBookID() == 2) {
genericViewHolder.itemView.setBackgroundColor(context.getResources().getColor(R.color.nokhba_openrose));
genericViewHolder.CategoryName.setTextColor(context.getResources().getColor(R.color.nokhba_darkrose));
Picasso.with(context).load(R.drawable.list_icon_08)
.error(R.drawable.no_internet)
.tag(context)
.placeholder(R.drawable.no_spic)
.into(genericViewHolder.CategoryImage);
} else if (currentItem.getBookID() == 3) {
genericViewHolder.CategoryName.setTextColor(context.getResources().getColor(R.color.nokhba_darkrose));
genericViewHolder.itemView.setBackgroundColor(context.getResources().getColor(R.color.nokhba_white));
Picasso.with(context).load(R.drawable.list_icon_08)
.error(R.drawable.no_internet)
.tag(context)
.placeholder(R.drawable.no_spic)
.into(genericViewHolder.CategoryImage);
}
}
}
#Override
public int getItemCount() {
return mData.size()-2;
}
public Categories getItem(int position) {
return mData.get(position-1);
}
public static class SimpleViewHolder extends RecyclerView.ViewHolder {
protected TextView CategoryName;
protected ImageView CategoryImage;
protected View itemView;
int position = -1;
public SimpleViewHolder(View itemView) {
super(itemView);
this.CategoryName = (TextView) itemView.findViewById(R.id.CategoryName);
this.CategoryImage = (ImageView) itemView.findViewById(R.id.CategoryImage);
// CategoryName.setTypeface(custom_font);
this.itemView = itemView;
getAdapterPosition();
this.CategoryName = (TextView) itemView.findViewById(R.id.CategoryName);
this.CategoryImage = (ImageView) itemView.findViewById(R.id.CategoryImage); }
}
}

With the library SectionedRecyclerViewAdapter you can group your items in sections and add a header to each section without worrying about the "position" of the headers:
class MySection extends StatelessSection {
String title;
List<Categories> list;
public MySection(String title, List<Categories> list) {
// call constructor with layout resources for this Section header, footer and items
super(R.layout.section_header, R.layout.section_item);
this.title = title;
this.list = list;
}
#Override
public int getContentItemsTotal() {
return list.size(); // number of items of this section
}
#Override
public RecyclerView.ViewHolder getItemViewHolder(View view) {
// return a custom instance of ViewHolder for the items of this section
return new MyItemViewHolder(view);
}
#Override
public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
MyItemViewHolder itemHolder = (MyItemViewHolder) holder;
// bind your view here
itemHolder.tvItem.setText(list.get(position).getName());
}
#Override
public RecyclerView.ViewHolder getHeaderViewHolder(View view) {
return new SimpleHeaderViewHolder(view);
}
#Override
public void onBindHeaderViewHolder(RecyclerView.ViewHolder holder) {
MyHeaderViewHolder headerHolder = (MyHeaderViewHolder) holder;
// bind your header view here
headerHolder.tvItem.setText(title);
}
}
Then you set up the RecyclerView with your Sections:
// Create an instance of SectionedRecyclerViewAdapter
SectionedRecyclerViewAdapter sectionAdapter = new SectionedRecyclerViewAdapter();
// Create your sections with a sub list of data from mData
MySection data1Section = new MySection("First 10 elements start", categories1List);
MySection data2Section = new MySection("Elements from 10 to 20 start", categories2List);
MySection data3Section = new MySection("Elements from 20 to 30 start", categories3List);
// Add your Sections to the adapter
sectionAdapter.addSection(data1Section);
sectionAdapter.addSection(data2Section);
sectionAdapter.addSection(data3Section);
// Set up your RecyclerView with the SectionedRecyclerViewAdapter
RecyclerView recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
recyclerView.setAdapter(sectionAdapter);