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Cast exception on multiple viewholder recyclerview

i used multiple viewholder in DataListAdapter.
each holder have a adapter.
my adapter :
public class DataListAdapter extends BaseAdapter<HomeListItem> {
private RecyclerView.RecycledViewPool pool;
public static final int ADS = 10, DATA = 11, PIC = 13, QUE=14;
public DataListAdapter(ArrayList<HomeListItem> dataList, AdapterListener<HomeListItem> listener) {
this.dataList = dataList;
this.listener = listener;
pool = new RecyclerView.RecycledViewPool();
}
#Override
public void onViewRecycled(#NonNull BaseViewHolder holder) {
super.onViewRecycled(holder);
}
#NonNull
#Override
public BaseViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
if (viewType == ADS){
return new ADSDataHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_home_ads, parent, false));
}else if (viewType == PIC) {
return new PictureHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item_home, parent, false));
}else if (viewType == QUE) {
return new QuestionHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item_home, parent, false));
}else
return new DataHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.list_item_home, parent, false));
}
#Override
public int getItemViewType(int position) {
if (dataList.get(position).getType() == ContentType.ADS)
return ADS;
if (dataList.get(position).getType() == ContentType.GALLERY)
return PIC;
if (dataList.get(position).getType() == ContentType.LIBS )
return DATA;
return QUE;
}
#Override
public void onBindViewHolder(#NonNull BaseViewHolder holder, int position) {
if (holder instanceof DataHolder){
((DataHolder) holder).bind(dataList.get(position));
} else if (holder instanceof ADSDataHolder) {
((ADSDataHolder) holder).bind(dataList.get(position));
} else if (holder instanceof PictureHolder) {
((PictureHolder) holder).bind(dataList.get(position));
}else if (holder instanceof QuestionHolder) {
((QuestionHolder) holder).bind(dataList.get(position));
}
}
class ADSDataHolder extends BaseViewHolder {
...
}
class PictureHolder extends BaseViewHolder {
...
}
class QuestionHolder extends BaseViewHolder{
private RecyclerView recyclerView;
private TextView title;
private View more;
public QuestionHolder(View itemView) {
super(itemView);
setType(QUE);
more = itemView.findViewById(R.id.more);
title = itemView.findViewById(R.id.title);
recyclerView = itemView.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(itemView.getContext(),RecyclerView.HORIZONTAL,false));
recyclerView.hasFixedSize();
recyclerView.setRecycledViewPool(pool);
}
public void bind(HomeListItem data) {
Collections.reverse(data.getData());
title.setText(data.getType().getVisibleName());
HomeQuestionAdapter adapter = new HomeQuestionAdapter((ArrayList<MainPageItem>) (ArrayList<?>) data.getData(),
new AdapterListener<MainPageItem>() {
#Override
public void onItemClick(MainPageItem item) {
onListItemClick(itemView.getContext(), data.getType(), item.getItemId());
}
});
recyclerView.setAdapter(adapter);
more.setOnClickListener(v -> listener.onItemClick(data));
}
}
class DataHolder extends BaseViewHolder {
private RecyclerView recyclerView;
private TextView title;
private View more;
DataHolder(View itemView) {
super(itemView);
setType(DATA);
more = itemView.findViewById(R.id.more);
title = itemView.findViewById(R.id.title);
recyclerView = itemView.findViewById(R.id.recyclerView);
recyclerView.setLayoutManager(new LinearLayoutManager(itemView.getContext(),
LinearLayoutManager.HORIZONTAL, true));
recyclerView.hasFixedSize();
recyclerView.setRecycledViewPool(pool);
}
public void bind(HomeListItem data) {
Collections.reverse(data.getData());
title.setText(data.getType().getVisibleName());
SmallItemAdapter adapter = new SmallItemAdapter((ArrayList<MainPageItem>)
(ArrayList<?>) data.getData(),
new AdapterListener<MainPageItem>() {
#Override
public void onItemClick(MainPageItem item) {
onListItemClick(itemView.getContext(), data.getType(), item.getItemId());
}
});
recyclerView.setAdapter(adapter);
recyclerView.scrollToPosition(data.getData().size() - 1);
more.setOnClickListener(v -> listener.onItemClick(data));
}
}
private void onListItemClick(Context context, ContentType contentType, long id) {
// click
}
}
BaseAdapter:
public abstract class BaseAdapter<T> extends RecyclerView.Adapter<BaseViewHolder> {
protected List<T> dataList;
protected final int DATA_TYPE = 1;
protected boolean isLoading = false, isMoreDataAvailable = false;
protected AdapterListener<T> listener;
#Override
public int getItemViewType(int position) {
if (dataList.get(position) == null)
return -1;
else return DATA_TYPE;
}
#Override
public int getItemCount() {
return dataList.size();
}
public void setMoreDataAvailable(boolean isMoreDataAvailable) {
this.isMoreDataAvailable = isMoreDataAvailable;
}
public void removeLoadingItem() {
if (dataList.size() > 0 && dataList.get(dataList.size() - 1) == null) {
dataList.remove(dataList.size() - 1);
notifyItemRemoved(dataList.size() - 1);
}
}
public void notifyDataChanged() {
isLoading = false;
notifyDataSetChanged();
}
}
and BaseViewHolder:
public class BaseViewHolder extends RecyclerView.ViewHolder {
private int type;
public BaseViewHolder(View itemView) {
super(itemView);
}
}
when i scroll the recyclerview gives me an error
my error:
:00:26.247 4194-4194/ir.hnfadak.shahidezendeh E/PushPole:Exception caught
java.lang.ClassCastException: ir.hfadak.fadakmedia.UI.Main.Home.Picture.SmallItemAdapter$DataHolder cannot be cast to ir.hfadak.fadakmedia.UI.Main.Question.HomeQuestionAdapter$DataQueHolder
at ir.hfadak.fadakmedia.UI.Main.Question.HomeQuestionAdapter.onBindViewHolder(HomeQuestionAdapter.java:31)
at androidx.recyclerview.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:7065)
at androidx.recyclerview.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:7107)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:6012)
at androidx.recyclerview.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:6279)
at androidx.recyclerview.widget.GapWorker.prefetchPositionWithDeadline(GapWorker.java:288)
at androidx.recyclerview.widget.GapWorker.flushTaskWithDeadline(GapWorker.java:345)
at androidx.recyclerview.widget.GapWorker.flushTasksWithDeadline(GapWorker.java:361)
at androidx.recyclerview.widget.GapWorker.prefetch(GapWorker.java:368)
at androidx.recyclerview.widget.GapWorker.run(GapWorker.java:399)
at android.os.Handler.handleCallback(Handler.java:754)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:163)
at android.app.ActivityThread.main(ActivityThread.java:6238)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:933)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:823)
and my HomeQuestionAdapter
public class HomeQuestionAdapter extends RecyclerView.Adapter<HomeQuestionAdapter.DataQueHolder> {
private RoundedCorners roundedCorners;
protected List<MainPageItem> dataList;
protected final int DATA_TYPE = 1;
protected boolean isLoading = false, isMoreDataAvailable = false;
protected AdapterListener<MainPageItem> listener;
public HomeQuestionAdapter(ArrayList<MainPageItem> dataList, AdapterListener<MainPageItem> listener) {
this.dataList = dataList;
this.listener = listener;
roundedCorners = new RoundedCorners(16);
}
#Override
public int getItemViewType(int position) {
if (dataList.get(position) == null)
return -1;
else return DATA_TYPE;
}
#Override
public int getItemCount() {
return dataList.size();
}
public void setMoreDataAvailable(boolean isMoreDataAvailable) {
this.isMoreDataAvailable = isMoreDataAvailable;
}
public void removeLoadingItem() {
if (dataList.size() > 0 && dataList.get(dataList.size() - 1) == null) {
dataList.remove(dataList.size() - 1);
notifyItemRemoved(dataList.size() - 1);
}
}
public void notifyDataChanged() {
isLoading = false;
notifyDataSetChanged();
}
#NonNull
#Override
public HomeQuestionAdapter.DataQueHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
return new DataQueHolder(LayoutInflater.from(parent.getContext())
.inflate(R.layout.item_list_simple_question, parent, false));
}
#Override
public void onBindViewHolder(#NonNull HomeQuestionAdapter.DataQueHolder holder, int position) {
if (!isLoading && isMoreDataAvailable && position >= getItemCount() - 1) {
isLoading = true;
listener.onLoadMore();
} else {
holder.bind(dataList.get(position));
}
}
class DataQueHolder extends RecyclerView.ViewHolder {
private ImageView image;
private ImageView share,faivorid;
private TextView question,answer,view;
DataQueHolder(View itemView) {
super(itemView);
image = itemView.findViewById(R.id.imageQue);
question = itemView.findViewById(R.id.titleQue);
answer = itemView.findViewById(R.id.answerQue);
share = itemView.findViewById(R.id.share);
faivorid = itemView.findViewById(R.id.favorite);
view = itemView.findViewById(R.id.viewtxt);
}
void bind(MainPageItem data) {
Glide.with(itemView)
.load(data.getItemSmallImageAddress())
.apply(bitmapTransform(roundedCorners))
.apply(new RequestOptions().error(R.drawable.img_list_def)
.placeholder(R.drawable.img_list_def))
.into(image);
question.setText(data.getItemTitle());
answer.setText(data.getItemDescription());
share.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
ContextUtil.share(itemView.getContext(),
data.getItemTitle() + "\n\n"
+ data.getItemDescription() + "\n\n"
+ data.getItemSmallImageAddress());
}
});
itemView.setOnClickListener(v -> listener.onItemClick(data));
}
}
}
Where does the code is wrong?

Your are type casting instance of super class to a reference of sub class which is causing this error.
Instead create something like this:-
public void onBindViewHolder(#NonNull BaseViewHolder holder, int position) {
if (holder instanceof DataQueHolder){
((DataQueHolder) holder).bind(dataList.get(position));
}else if (holder instanceof DataHolder){
((DataHolder) holder).bind(dataList.get(position));
}else if (holder instanceof ADSDataHolder) {
((ADSDataHolder) holder).bind(dataList.get(position));
} else if (holder instanceof PictureHolder) {
((PictureHolder) holder).bind(dataList.get(position));
}else if (holder instanceof QuestionHolder) {
((QuestionHolder) holder).bind(dataList.get(position));
}
}

Please remove this below line from DataListAdapter
recyclerView.setRecycledViewPool(pool);
It works for me..

Nested ArrayList in Android

I want to create a cart which has Nested array.
Like my parent array has items and child array has item's respective toppings but when i add toppings to my item array it automatically add same toppings to all index of items array. Here is my image:
Here i'm attaching my code below
Item_Array
private void addNewToppinDialoge(ProductsModel.Datum datum, int adapterPosition) {
ProductOrderModel.Datum productOrderModel = new ProductOrderModel.Datum();
productOrderModel.setCategoryID(datum.getProductID());
productOrderModel.setCategory(datum.getProductName());
int i = productActivity.productOrderModelArrayList.size();
int j = i + 1;
productOrderModel.setSrNO(String.valueOf(j));
productActivity.productOrderModelArrayList.add(productOrderModel);
productActivity.refreshOrderAdapter();
productActivity.changeTitleToolbar(datum.getProductName());
}
Toppings_array
private void addToppingToCart(ToppingsModel.Datum.LookupValue lookupValue, int adapterPosition) {
ProductOrderModel.Datum datum = new ProductOrderModel.Datum();
ProductOrderModel.Datum.SubCategory subCategory = new ProductOrderModel.Datum.SubCategory();
subCategory.setCategory(lookupValue.getLookupvalue());
int pos = productActivity.productOrderModelArrayList.size() - 1;
Log.e("POS", String.valueOf(ProductActivity.productOrderModelArrayList.size() - 1));
productActivity.productOrderModelArrayListSub.add(subCategory);
int subPos = productActivity.productOrderModelArrayListSub.size() - 1;
productActivity.productOrderModelArrayListSub.get(subPos).setCategory(lookupValue.getLookupvalue());
productActivity.productOrderModelArrayList.get(pos).setSubCategory(productActivity.productOrderModelArrayListSub);
productActivity.refreshOrderAdapter();
}
Adapter For Cart
public class MyOrderAdapter extends RecyclerView.Adapter<MyOrderAdapter.ViewHolder> {
public static ToppingsListAdapter toppingsListAdapter;
static Context mContext;
ArrayList<ProductOrderModel.Datum> orderModelArrayList;
public MyOrderAdapter(Context mContext, ArrayList<ProductOrderModel.Datum> orderModelArrayList) {
MyOrderAdapter.mContext = mContext;
this.orderModelArrayList = orderModelArrayList;
}
#NonNull
#Override
public MyOrderAdapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View mView = LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.myorder_layout, viewGroup, false);
return new MyOrderAdapter.ViewHolder(mView);
}
#Override
public void onBindViewHolder(#NonNull MyOrderAdapter.ViewHolder holder, int i) {
holder.mTextOrderName.setText(orderModelArrayList.get(i).getCategory());
holder.mImageRemove.setOnClickListener(v -> removeItem(orderModelArrayList.get(i), holder.getAdapterPosition()));
holder.mTextSerialNo.setText(orderModelArrayList.get(i).getSrNO() + ".");
ArrayList<ProductOrderModel.Datum.SubCategory> arrayItem = (ArrayList<ProductOrderModel.Datum.SubCategory>) orderModelArrayList.get(i).getSubCategory();
if (arrayItem == null) {
} else {
toppingsListAdapter = new ToppingsListAdapter(mContext, arrayItem);
holder.mRecyclerToppings.setAdapter(toppingsListAdapter);
}
}
protected void removeItem(ProductOrderModel.Datum productOrderModel, int adapterPosition) {
}
#Override
public int getItemCount() {
return orderModelArrayList.size();
}
public void refreshAdapter() {
toppingsListAdapter.notifyDataSetChanged();
}
public static class ViewHolder extends RecyclerView.ViewHolder {
public RecyclerView mRecyclerToppings;
private TextView mTextOrderName, mTextSerialNo;
private ImageView mImageRemove;
public ViewHolder(#NonNull View itemView) {
super(itemView);
mTextOrderName = itemView.findViewById(R.id.orderItemName);
mImageRemove = itemView.findViewById(R.id.orderRemove);
mTextSerialNo = itemView.findViewById(R.id.srno);
mRecyclerToppings = itemView.findViewById(R.id.text_toppings);
RecyclerView.LayoutManager manager = new LinearLayoutManager(mContext, LinearLayout.VERTICAL, false);
mRecyclerToppings.setLayoutManager(manager);
}
public int getAdapterPosition(ProductOrderModel.Datum.SubCategory remove) {
return 0;
}
}
}
strong text:

I guess you need to header and footer of RecyclerView. Here is the code.
Try this one:
public class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
String[] data;
public HeaderAdapter(String[] data) {
this.data = data;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) {
//inflate your layout and pass it to view holder
return new VHItem(null);
} else if (viewType == TYPE_HEADER) {
//inflate your layout and pass it to view holder
return new VHHeader(null);
}
throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof VHItem) {
String dataItem = getItem(position);
//cast holder to VHItem and set data
} else if (holder instanceof VHHeader) {
//cast holder to VHHeader and set data for header.
}
}
#Override
public int getItemCount() {
return data.length + 1;
}
#Override
public int getItemViewType(int position) {
if (isPositionHeader(position))
return TYPE_HEADER;
return TYPE_ITEM;
}
private boolean isPositionHeader(int position) {
return position == 0;
}
private String getItem(int position) {
return data[position - 1];
}
class VHItem extends RecyclerView.ViewHolder {
TextView title;
public VHItem(View itemView) {
super(itemView);
}
}
class VHHeader extends RecyclerView.ViewHolder {
Button button;
public VHHeader(View itemView) {
super(itemView);
}
}
}

How to change one adapter value from another adapter?

I have a little bit problem.In my activity there is two Adapter one is for color selection and another is for size selection. While i clicked one of the item of color then recently the available size adapter should be change but i got problem in size adapter. it changes only when i click the size item. I research and try to solve problem but it doesnt works for me.
Here is my code.
AddToCartActivity.java
public class AddToCartActivity extends BaseActivity{
#Override
protected int getLayout() {
return R.layout.activity_add_to_cart;
}
#Override
protected void init() {
//api called here
}
// response of api
#Override
public void productDetail(ProductCommonModel productCommonModel,
ArrayList<ProductChildModel> productChildModels, HashMap<Integer,
ArrayList<ChildAttributeModel>> childWithAttribute, HashMap<Integer,
ArrayList<ChildImageModel>> childWithImages,
ArrayList<com.hazesoft.dokan.singleproductdetail.model.ColorModel>
colorModels, ArrayList<SizeModel> sizeModels,
ArrayList<RelatedProductModel> relatedProductModels) {
this.productCommonModel = productCommonModel;
this.productChildModels = productChildModels;
this.childWithAttribute = childWithAttribute;
this.childWithImages = childWithImages;
this.colorModels = colorModels;
this.sizeModels = sizeModels;
this.relatedProductModels = relatedProductModels;
tvProductName.setText(productCommonModel.getName());
if (productCommonModel.getSpecialPrice() == 0) {
tvSellingPrice.setText(getString(R.string.rs) + productCommonModel.getSellingPrice());
tvDiscount.setVisibility(View.GONE);
tvSpecialPrice.setVisibility(View.GONE);
} else {
tvSpecialPrice.setText(getString(R.string.rs) + productCommonModel.getSpecialPrice());
tvSellingPrice.setText(getString(R.string.rs) + productCommonModel.getSellingPrice());
tvSellingPrice.setPaintFlags(tvSellingPrice.getPaintFlags() | Paint.STRIKE_THRU_TEXT_FLAG);
tvDiscount.setText(productCommonModel.getDiscount() + getString(R.string.percentage));
}
setChildDetail(childWithAttribute, productChildModels);
setColorModel(colorModels);
setSizeModel(sizeModels);
quantity = Integer.parseInt(tvQuantityCart.getText().toString());
}
// setcolor adapter
private void setColorModel(ArrayList<ColorModel> colorModels) {
MyColorGridViewAdapter adapter = new MyColorGridViewAdapter(this, colorModels);
gvColor.setAdapter(adapter);
gvColor.setOnItemClickListener(new AdapterView.OnItemClickListener() {
#Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
adapter.setSelectedPostion(position);
adapter.notifyDataSetChanged();
}
});
}
// set size adapter
private void setSizeModel(ArrayList<SizeModel> sizeModels) {
sizeCustomModels = new ArrayList<>();
for(int i=0;i<sizeModels.size();i++){
sizeCustomModels.add(new SizeCustomModel(sizeModels.get(i).getAttName(),0));
}
setCustomSizeModelToAdapter(sizeCustomModels);
}
// this is code when i click color and change the size adapter but size doesnt change recently only changes when i click any item of the size
public void getSelectedC0lor(String color) {
selectedColor = color;
selectedSize=null;
sizeCustomModels = new ArrayList<>();
availableSize = new ArrayList<>();
for (int i = 0; i < skuColorSIzeList.size(); i++) {
if (skuColorSIzeList.get(i).getColor().equals(selectedColor)) {
availableSize.add(skuColorSIzeList.get(i).getSize());
}
}
for(int i=0;i<sizeModels.size();i++){
String size = null;
int status=0;
for(int j=0;j<availableSize.size();j++){
if(sizeModels.get(i).getAttName().equals(availableSize.get(j))){
size = sizeModels.get(i).getAttName();
status = 1;
break;
}else {
size = sizeModels.get(i).getAttName();
status = 0;
}
}
sizeCustomModels.add(new SizeCustomModel(size,status));
}
sizeRecylerAdapter.getNewModel(sizeCustomModels);
/*sizeRecylerAdapter = new MyCustomSizeRecylerAdapter(sizeCustomModels,this);
rvSize.setAdapter(sizeRecylerAdapter);
sizeRecylerAdapter.notifyDataSetChanged();*/
/*setCustomSizeModelToAdapter(sizeCustomModels);*/
}
}
MyColorGridViewAdapter.java
public class MyColorGridViewAdapter extends BaseAdapter {
Context context;
List<ColorModel> colorModelList;
String select_color;
boolean ch =false;
int checkPosition = -1;
public MyColorGridViewAdapter(Context context, List<ColorModel> colorModelList) {
this.context = context;
this.colorModelList = colorModelList;
}
public void setSelectedPostion(int postion){
this.checkPosition = postion;
}
#Override
public int getCount() {
return colorModelList.size();
}
#Override
public Object getItem(int position) {
return colorModelList.get(position);
}
#Override
public long getItemId(int position) {
return position;
}
#Override
public View getView(int position, View convertView, ViewGroup parent) {
ViewHolder holder = null;
if(convertView==null){
convertView = LayoutInflater.from(context).inflate(R.layout.custom_color_list_item,null);
holder = new ViewHolder(convertView);
convertView.setTag(holder);
}else {
holder = (ViewHolder) convertView.getTag();
}
Picasso.with(context).load(colorModelList.get(position).getImage()).into(holder.ivImage);
holder.tvColorName.setText(colorModelList.get(position).getAttName());
if(checkPosition==position){
holder.ivChecked.setVisibility(View.VISIBLE);
select_color = colorModelList.get(position).getAttName();
if( context instanceof AddToCartActivity){
((AddToCartActivity) context).getSelectedC0lor(select_color);
}
}else {
holder.ivChecked.setVisibility(View.GONE);
}
if(colorModelList.size()==1){
holder.ivChecked.setVisibility(View.VISIBLE);
select_color = colorModelList.get(position).getAttName();
if( context instanceof AddToCartActivity){
((AddToCartActivity) context).getSelectedC0lor(select_color);
}
}
return convertView;
}
class ViewHolder{
#BindView(R.id.view)
LinearLayout view;
#BindView(R.id.tv_color_name)
TextViewHelper tvColorName;
#BindView(R.id.iv_image)
ImageView ivImage;
#BindView(R.id.iv_checked)
ImageView ivChecked;
public ViewHolder(View view) {
ButterKnife.bind(this,view);
}
}
}
MyCustomSizeRecylerAdapter.java
public class MyCustomSizeRecylerAdapter extends RecyclerView.Adapter<MyCustomSizeRecylerAdapter.MyViewHolder> {
ArrayList<SizeCustomModel> sizeModels;
Context context;
int checkPosition = -1;
String selectedSize;
public MyCustomSizeRecylerAdapter(ArrayList<SizeCustomModel> sizeModels, Context context) {
this.sizeModels = sizeModels;
this.context = context;
}
public void getNewModel(ArrayList<SizeCustomModel> customModels) {
sizeModels.clear();
this.sizeModels = customModels;
selectedSize = null;
Log.d("sizemodel", "getNewModel: " + new Gson().toJson(sizeModels));
notifyDataSetChanged();
}
public void getSelectedPosition(int position) {
checkPosition = position;
notifyDataSetChanged();
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.size_adapter, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
holder.tv_sizeName.setText(sizeModels.get(position).getSize());
holder.ll_sizeAdapter.setBackgroundResource(R.drawable.ellipse_register);
if (sizeModels.get(position).getStock_Status() == 0) {
holder.ll_mainview.setClickable(false);
holder.ll_sizeAdapter.setBackgroundResource(R.color.blue_700);
} else if (sizeModels.get(position).getStock_Status() == 1) {
holder.ll_sizeAdapter.setBackgroundResource(R.drawable.ellipse_register);
if (checkPosition == position) {
holder.ll_sizeAdapter.setBackgroundResource(R.drawable.ellipse_green);
holder.tv_sizeName.setTextColor(context.getResources().getColor(R.color.white));
selectedSize = sizeModels.get(position).getSize();
if (context instanceof AddToCartActivity) {
((AddToCartActivity) context).getSelectSize(selectedSize);
}
} else {
holder.ll_sizeAdapter.setBackgroundResource(R.drawable.ellipse_register);
holder.tv_sizeName.setTextColor(context.getResources().getColor(R.color.tv_black));
}
if (sizeModels.size() == 1) {
holder.ll_sizeAdapter.setBackgroundResource(R.drawable.ellipse_green);
holder.tv_sizeName.setTextColor(context.getResources().getColor(R.color.white));
selectedSize = sizeModels.get(position).getSize();
if (context instanceof AddToCartActivity) {
((AddToCartActivity) context).getSelectSize(selectedSize);
}
}
}
}
#Override
public int getItemCount() {
return sizeModels.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
#BindView(R.id.tv_sizeName)
TextView tv_sizeName;
#BindView(R.id.ll_sizeAdapter)
LinearLayout ll_sizeAdapter;
#BindView(R.id.main_view)
LinearLayout ll_mainview;
public MyViewHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
At first both adapter will set data and after click color item the size adapter must be change but it only changes when i click any of the item. adapter.notifyDataSetChanged() doesnt work here for me.
Both Adapter set
When i click color item but doesnt change size adapter
when i click size item only change size adapter

Use Interface to bridge with two adapter and communicate with each other.

Android: weird reaction when adding views in RecyclerView

I'm using a custom recyclerView that can have a footer and a header, that shoudnt influence the animations tho, here is a video of what's happening: http://www.videosprout.com/video?id=00fae6ac-39ff-47b6-b981-803d2773b67b
Why is every view moving one position back and then back to where it was instead of not doing that?
Here's my adapter:
public class AddEventsAdapter extends HFRecyclerViewAdapter<String, AddEventsAdapter.ViewHolder> {
public AddEventsAdapter(Context context) {
super(context);
}
#Override
public void footerOnVisibleItem() {
}
#Override
public void addData(int position, String item) {
super.addData(position, item);
}
#Override
public ViewHolder onCreateDataItemViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext())
.inflate(R.layout.event_item, parent, false);
return new ViewHolder(v);
}
#Override
public void onBindDataItemViewHolder(ViewHolder holder, int position) {
holder.itemTv.setText(getData().get(position));
}
class ViewHolder extends RecyclerView.ViewHolder{
TextView itemTv;
public ViewHolder(View itemView) {
super(itemView);
itemTv = (TextView)itemView.findViewById(R.id.eventName);
}
}
}
The implementation:
final AddEventsAdapter MyAdapter = new AddEventsAdapter(this);
AddEventsRecycler.setAdapter(MyAdapter);
AddEventsRecycler.setLayoutManager(new LinearLayoutManager(this));
//add footer
final View footerView = LayoutInflater.from(this).inflate(R.layout.events_footer, AddEventsRecycler, false);
MyAdapter.setFooterView(footerView);
footerView.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
MyAdapter.addData(0, "Event number" + ++g);
}
});
ArrayList<String> data = new ArrayList<>();
data.add("Vacation");
MyAdapter.setData(data);
The custom RecyclerAdapter:
public abstract class HFRecyclerViewAdapter<T, VH extends RecyclerView.ViewHolder> extends BaseRecyclerViewAdapter<T> {
public HFRecyclerViewAdapter(Context context) {
super(context);
}
private static final int TYPE_HEADER = Integer.MAX_VALUE;
private static final int TYPE_FOOTER = Integer.MAX_VALUE - 1;
private static final int ITEM_MAX_TYPE = Integer.MAX_VALUE - 2;
private RecyclerView.ViewHolder headerViewHolder;
private RecyclerView.ViewHolder footerViewHolder;
class HFViewHolder extends RecyclerView.ViewHolder {
HFViewHolder(View v) {
super(v);
}
}
public void setHeaderView(View header){
if (headerViewHolder == null || header != headerViewHolder.itemView) {
headerViewHolder = new HFViewHolder(header);
notifyDataSetChanged();
}
}
public void setFooterView(View foot){
if (footerViewHolder == null || foot != footerViewHolder.itemView) {
footerViewHolder = new HFViewHolder(foot);
notifyDataSetChanged();
}
}
public void removeHeader(){
if (headerViewHolder != null){
headerViewHolder = null;
notifyDataSetChanged();
}
}
public void removeFooter(){
if (footerViewHolder != null){
footerViewHolder = null;
notifyDataSetChanged();
}
}
public boolean isHeader(int position){
return hasHeader() && position == 0;
}
public boolean isFooter(int position){
return hasFooter() && position == getDataItemCount() + (hasHeader() ? 1 : 0);
}
private int itemPositionInData(int rvPosition){
return rvPosition - (hasHeader() ? 1 : 0);
}
private int itemPositionInRV(int dataPosition){
return dataPosition + (hasHeader() ? 1 : 0);
}
#Override
public void notifyMyItemInserted(int itemPosition) {
notifyItemInserted(itemPositionInRV(itemPosition));
}
#Override
public void notifyMyItemRemoved(int itemPosition) {
notifyItemRemoved(itemPositionInRV(itemPosition));
}
#Override
public void notifyMyItemChanged(int itemPosition) {
notifyItemChanged(itemPositionInRV(itemPosition));
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_HEADER) {
return headerViewHolder;
} else if (viewType == TYPE_FOOTER) {
return footerViewHolder;
}
return onCreateDataItemViewHolder(parent, viewType);
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (!isHeader(position) && !isFooter(position))
onBindDataItemViewHolder((VH)holder, itemPositionInData(position));
if (isFooter(position)){
footerOnVisibleItem();
}
}
public abstract void footerOnVisibleItem();
#Override
public int getItemCount() {
int itemCount = getDataItemCount();
if (hasHeader()) {
itemCount += 1;
}
if (hasFooter()) {
itemCount += 1;
}
return itemCount;
}
#Override
public int getItemViewType(int position) {
if (isHeader(position)) {
return TYPE_HEADER;
}
if (isFooter(position)) {
return TYPE_FOOTER;
}
int dataItemType = getDataItemType(itemPositionInData(position));
if (dataItemType > ITEM_MAX_TYPE) {
throw new IllegalStateException("getDataItemType() must be less than " + ITEM_MAX_TYPE + ".");
}
return dataItemType;
}
public int getDataItemCount() {
return super.getItemCount();
}
/**
* make sure your dataItemType < Integer.MAX_VALUE-1
*
* #param position item view position in rv
* #return item viewType
*/
public int getDataItemType(int position){
return 0;
}
public boolean hasHeader(){
return headerViewHolder != null;
}
public boolean hasFooter(){
return footerViewHolder != null;
}
public abstract VH onCreateDataItemViewHolder(ViewGroup parent, int viewType);
public abstract void onBindDataItemViewHolder(VH holder, int position);
}
EDIT: Same is happening when removing a view, with removeData(getAdapterPosition()

why
this is happening because the element is being added to at the beginning of the array (index 0). when this happens, the RecyclerView will react as shown in the video, because the it pretends the backing data store is a list, and all elements are moved over one index, and the element is inserted in the beginning...which happens to be at the top.
you can see that it won't do this ugly behavior if elements are added at the end of the adapter: MyAdapter.addData(MyAdapter.getItemCount() - 1, "Event ");. but of course, this is not what you want either, because it is the wrong index...and now it would seem like existing elements are actually jumping up one index on the GUI and things...but this is an interesting experiment to verify the theory.
a solution
still add elements at the end of the array using MyAdapter.addData(MyAdapter.getItemCount() - 1, "Event ");, but make the LinearLayoutManager display elements in reverse! this can be done by:
setting the attribute directly like so: linearLayoutManager.setReverseLayout(true)
or you can use this handy constructor: LinearLayoutManager(context,orientation,isReversed)
you may have to do something about the headers and footers are positioned in the adapter to make sure they stay as headers and footers in the RecyclerView.Adapter though...once the RecyclerView.LayoutManager is displaying things in reverse.

implementing "add to favourite" mechanism in RecyclerView

i have a recyclerView with two sections regular and Favourites and for populating my RecyclerView i have List<Object> my object class :
public class Object {
String id,channelName;
boolean isFavorite;
}
now i want to put the values which have isfavorite == true to top of my recyclerView inside my Favourite section but i don't know where to start or exactly what to do ? do i have to sort the List<Object> with booleans ? if anybody can give me a little hint or guidance then it'll be so helpful for me,
please this image for better understanding ,
this is what i'm trying to get
i added the Section in my RecyclerView by SimpleSectionedRecyclerViewAdapter

class DataModal
{
public String title;
public boolean isFavourite;
public String getTitle() {
return title;
}
public void setTitle(String title) {
this.title = title;
}
public boolean isFavourite() {
return isFavourite;
}
public void setIsFavourite(boolean isFavourite) {
this.isFavourite = isFavourite;
}
}
public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
private final Context mContext;
private List<DataModal> mData;
public void add(DataModal 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 static class SimpleViewHolder extends RecyclerView.ViewHolder {
public final TextView title;
public SimpleViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.simple_text);
}
}
public SimpleAdapter(Context context, ArrayList<DataModal> data) {
mContext = context;
if (data != null)
mData = data;
else mData = new ArrayList<DataModal>();
}
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(mContext).inflate(R.layout.simple_item, parent, false);
return new SimpleViewHolder(view);
}
#Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {
DataModal data = mData.get(position);
holder.title.setText(data.getTitle());
holder.title.setOnClickListener(new Listener(position,mData.get(position)));
}
class Listener implements View.OnClickListener
{
DataModal Data;
int position;
Listener(int position,DataModal Data)
{
this.Data = Data;
this.position = position;
}
#Override
public void onClick(View view) {
if(Data.isFavourite())
{
//mark the view as unfavorite
}
else{
//mark the view as favorite
}
Toast.makeText(mContext,"Position ="+position,Toast.LENGTH_SHORT).show();
}
}
#Override
public int getItemCount() {
return mData.size();
}
}

public class SimpleAdapter extends RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
private final Context mContext;
private List<String> mData;
public void add(String 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 static class SimpleViewHolder extends RecyclerView.ViewHolder {
public final TextView title;
public SimpleViewHolder(View view) {
super(view);
title = (TextView) view.findViewById(R.id.simple_text);
}
}
public SimpleAdapter(Context context, String[] data) {
mContext = context;
if (data != null)
mData = new ArrayList<String>(Arrays.asList(data));
else mData = new ArrayList<String>();
}
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
final View view = LayoutInflater.from(mContext).inflate(R.layout.simple_item, parent, false);
return new SimpleViewHolder(view);
}
#Override
public void onBindViewHolder(SimpleViewHolder holder, final int position) {
holder.title.setText(mData.get(position));
holder.title.setOnClickListener(new Listener(position,mData.get(position),false,favview));
}
class Listener implements View.OnClickListener
{
ImageView favoriteView;
int position;
Listener(int position,String Data,boolean isFavourite,ImageView favoriteView)
{
this.favoriteView = favoriteView;
this.position = position;
}
#Override
public void onClick(View view) {
if(isFavourite)
{
//mark the view as unfavorite
}
else{
//mark the view as favorite
}
Toast.makeText(mContext,"Position ="+position,Toast.LENGTH_SHORT).show();
}
}
#Override
public int getItemCount() {
return mData.size();
}
}