This not like question its more like discussion
I'm using swipe cards from this library 'link.fls:swipestack:0.3.0'
With the help of these cards i'm creating recycle view on every card but the data is been repeating for every card
i have used adapter to generate cards and inside this adapter i have initialized recycle view
So my question is how to use recycle view with these swipe cards with non repeating values on every card...
Thanks in advance
Adapter code
public class ParentExamsCardAdapter extends BaseAdapter {
private Context mContext;
private List<ParentExamCards_Pojo> parentExamCardsPojoList = new ArrayList<>();
private RecyclerView recyclerView;
private ParentExamsDataAdapter dataAdapter;
public ParentExamsCardAdapter(Context mContext, List<ParentExamCards_Pojo> parentExamCardsPojoList, ParentExamsDataAdapter dataAdapter) {
this.mContext = mContext;
this.parentExamCardsPojoList = parentExamCardsPojoList;
this.dataAdapter = dataAdapter;
}
#Override
public int getCount() {
return parentExamCardsPojoList.size();
}
#Override
public Object getItem(int i) {
return i;
}
#Override
public long getItemId(int i) {
return i;
}
#Override
public View getView(int position, View view, ViewGroup viewGroup) {
View itemView = LayoutInflater.from(mContext).inflate(R.layout.single_parent_exams_swipecards, viewGroup, false);
ParentExamCards_Pojo pojoCards = parentExamCardsPojoList.get(position);
CardView cardView = itemView.findViewById(R.id.singleParentExamsCards_cardView);
LinearLayout linearLayout = itemView.findViewById(R.id.singleParentExamsCards_linear);
TextView textView_Title = itemView.findViewById(R.id.singleParentExamsCards_txtTitle);
cardView.setBackgroundColor(pojoCards.getColor());
textView_Title.setText(pojoCards.getExamname());
recyclerView = itemView.findViewById(R.id.singleParentExamsCards_recycleView);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(mContext);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(mContext, LinearLayoutManager.VERTICAL));
recyclerView.setAdapter(dataAdapter);
return itemView;
}
#Override
public int getItemViewType(int position) {
return position;
}
}
ParentExamsDataAdapter
public class ParentExamsDataAdapter extends RecyclerView.Adapter<ParentExamsDataAdapter.MyViewHolder>{
private Context mContext;
private List<List<ParentExams_Pojo>> parentExamsPojoDataList = new ArrayList<>();
public ParentExamsDataAdapter(Context mContext, List<List<ParentExams_Pojo>> parentExamsPojoDataList) {
this.mContext = mContext;
this.parentExamsPojoDataList = parentExamsPojoDataList;
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView textView_name;
TextView textView_date;
TextView textView_time;
public MyViewHolder(View itemView) {
super(itemView);
textView_name=itemView.findViewById(R.id.singleParentExamsData_txtName);
textView_date=itemView.findViewById(R.id.singleParentExamsData_txtDate);
textView_time=itemView.findViewById(R.id.singleParentExamsData_txtTime);
}
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(mContext).inflate(R.layout.single_parent_exams_data, parent, false);
return new MyViewHolder(view);
}
#Override
public void onBindViewHolder(MyViewHolder holder, int position) {
ParentExams_Pojo pojoData=parentExamsPojoDataList.get(position).get(position);
holder.textView_name.setText(pojoData.getSubjectname()+"-"+pojoData.getSubjectaspectname());
holder.textView_date.setText(pojoData.getExamdate());
holder.textView_time.setText(pojoData.getStarttime());
}
#Override
public int getItemCount() {
return parentExamsPojoDataList.size();
}
}
Basically You have to Set different adapter(ParentExamsDataAdapter(exams[position].getmarks)) inside the getview() method of ParentExamCardAdapter. The problem here is you are sending one instance of adapter to your parent adapter from Activity or Fragment I guess. And you are setting this for every CardAdapter.
Edit:
Adding suggested code changes from the comments to the answer.
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(mContext);
recyclerView.setLayoutManager(layoutManager);
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.addItemDecoration(new DividerItemDecoration(mContext, LinearLayoutManager.VERTICAL));
recyclerView.setAdapter(new ParentExamsDataAdapter(**list of items**));
found the solution your are passing same adapter to every recyclerview in every card that is one reason for your problem in ParentExamsCardAdapter
recyclerView.setAdapter(dataAdapter);
the data adapter is same for every postion
the arraylist value is same for aa recyclerview
pass List List ParentExams_Pojo arraylist to ParentExamsCardAdapter use its size in getItemCount
then in onbindviewholder use the arraylist.get(position) to pass to adapter then in adapter use List ParentExams_Pojo to get the list and its size in getitemcount it will solve i think
thus you will have only 1 positon in the adapyter
ParentExams_Pojo pojoData=parentExamsPojoDataList.get(position)
Related
I am making an app on android studio. I want to display items in a recycler view using grid layout manager. I am adding three element into the array through which I want to display the recycler view. But when I am running the app, the app is displaying only two items. I don't know what's happening. I have set the height of the recycler view as wrap content still getting this problem.
Here's my code:-
ModelClass.java:-
public class ModelClass {
private String recyc_show_note;
ModelClass(String recyc_show_note){
this.recyc_show_note = recyc_show_note;
}
public String getRecyc_show_note() {
return recyc_show_note;
}}
Adapter.java:-
public class Adapter extends RecyclerView.Adapter<Adapter.ViewHolder> {
private List<ModelClass> recyc_cust_notes;
public Adapter (List<ModelClass>recyc_cust_notes){
this.recyc_cust_notes = recyc_cust_notes;
}
#NonNull
#Override
public Adapter.ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview, parent, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(#NonNull Adapter.ViewHolder holder, int position) {
String recyc_show_note = recyc_cust_notes.get(position).getRecyc_show_note();
holder.setData(recyc_show_note);
}
#Override
//returns list size
public int getItemCount() {
return recyc_cust_notes.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
private TextView recycler_view_note;
public ViewHolder(#NonNull View itemView) {
super(itemView);
recycler_view_note = itemView.findViewById(R.id.recyc_show_note);
}
public void setData(String recyc_show_note) {
recycler_view_note.setText(recyc_show_note);
}
}
}
MainActivity.java:-
RecyclerView recyclerView;
List<ModelClass>recyc_cust_notes;
Adapter adapter;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main)
SharedPreferences getSharedPreference = getSharedPreferences("My Notes", MODE_PRIVATE);
String note = getSharedPreference.getString("Note", null);
initData();
initRecyclerView();
}
private void initRecyclerView() {
recyclerView = findViewById(R.id.recycler_view);
GridLayoutManager gridLayoutManager = new GridLayoutManager(getApplicationContext(),2);
gridLayoutManager.setOrientation(RecyclerView.HORIZONTAL);
recyclerView.setLayoutManager(gridLayoutManager);
adapter = new Adapter(recyc_cust_notes);
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
}
private void initData() {
recyc_cust_notes = new ArrayList<>();
SharedPreferences getSharedPreference = getSharedPreferences("My Notes", MODE_PRIVATE);
String note = getSharedPreference.getString("Note", null);
recyc_cust_notes.add(new ModelClass(note));
recyc_cust_notes.add(new ModelClass("note"));
recyc_cust_notes.add(new ModelClass("sai"));
}
Just do it on this way
recyclerView.setLayoutManager(new GridLayoutManager(this, number_of_cols));
In XML
<androidx.recyclerview.widget.RecyclerView
android:id="#+id/rv_Grid"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
Java Code
int cols = 3; // length of cols
RecyclerView recyclerView = findViewById(R.id.rv_Grid);
recyclerView.setLayoutManager(new GridLayoutManager(this, cols));
adapter = new MyRecyclerViewAdapter(this, list);
recyclerView.setAdapter(adapter);
And Remove setOrientation.
It's because of your gridLayoutManager Orientation.
You have 2 choices to show all items:
Change orientation to VERTICAL
Change your recyclerView width to match-parent
RecyclerView setAdapter do but calling method ChatAdapter, registerAdapterDataObserver, onAttachedToRecyclerView, getItemCount 5 calling
xml layout_height is match_parent
getItemCount is 5 not null, but onCreateViewHolder is not called.
MyActivity.java:
List<ChatMessage> messages = new ArrayList<ChatMessage>();
LinearLayoutManager layoutManager = new LinearLayoutManager(getApplicationContext());
reyclerview_message_list.setAdapter(new ChatAdapter(messages, R.layout.chat_send));
reyclerview_message_list.setLayoutManager(new LinearLayoutManager(this));
reyclerview_message_list.setItemAnimator(new DefaultItemAnimator());
reyclerview_message_list.addItemDecoration(new DividerItemDecoration(getApplicationContext(), layoutManager.getOrientation()));
Adapter.java:
public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ViewHolder> {
private List<ChatMessage> itemList;
private int itemLayout;
public ChatAdapter(List<ChatMessage> items, int itemLayout){
this.itemList = items;
this.itemLayout = itemLayout;
}
#Override
public ChatAdapter.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(viewGroup.getContext()).inflate(itemLayout, viewGroup, false);
return new ChatAdapter.ViewHolder(view);
}
#Override
public void onBindViewHolder(ChatAdapter.ViewHolder viewholder, int position) {
ChatMessage item = itemList.get(position);
viewholder.messageBody.setText(item.getMessageBody());
viewholder.messageTime.setText(item.getMessageTime());
viewholder.messageState.setText(item.getMessageState());
viewholder.itemView.setTag(item);
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView messageBody, messageTime, messageState;
public ViewHolder(View itemView) {
super(itemView);
messageBody = (TextView)itemView.findViewById(R.id.text_message_body);
messageTime= (TextView)itemView.findViewById(R.id.text_message_time);
messageState= (TextView)itemView.findViewById(R.id.text_message_state);
}
}
#Override
public int getItemCount() {
return itemList.size();
}
Why is onCreateViewHolder not called?
I just update your Adapter code and its working well.
public class ChatAdapter extends RecyclerView.Adapter<ChatAdapter.ViewHolder> {
private List<ChatMessage> itemList;
private int itemLayout;
private Context mContext;
public ChatAdapter(List<ChatMessage> items, int itemLayout, Context context){
this.itemList = items;
this.itemLayout = itemLayout;
this.mContext = context;
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int viewType) {
View view = LayoutInflater.from(mContext).inflate(itemLayout, viewGroup, false);
return new ViewHolder(view);
}
#Override
public void onBindViewHolder(ViewHolder viewholder, int position) {
ChatMessage item = itemList.get(position);
viewholder.messageBody.setText(item.getMessageBody());
viewholder.messageTime.setText(item.getMessageTime());
viewholder.messageState.setText(item.getMessageState());
viewholder.itemView.setTag(item);
}
public class ViewHolder extends RecyclerView.ViewHolder {
public TextView messageBody, messageTime, messageState;
public ViewHolder(View itemView) {
super(itemView);
messageBody = (TextView)itemView.findViewById(R.id.text_message_body);
messageTime= (TextView)itemView.findViewById(R.id.text_message_time);
messageState= (TextView)itemView.findViewById(R.id.text_message_state);
}
}
#Override
public int getItemCount() {
return itemList.size();
}
}
And you Activity or Fragment first get the RecyclerView and then set adapter like this:
RecyclerView reyclerview_message_list = findViewById(R.id.recyclerView);
reyclerview_message_list.setAdapter(new ChatAdapter(messages, R.layout.list_row, this)); // passed another parameter Context
reyclerview_message_list.setLayoutManager(new LinearLayoutManager(this));
reyclerview_message_list.setItemAnimator(new DefaultItemAnimator());
reyclerview_message_list.addItemDecoration(new DividerItemDecoration(getApplicationContext(), layoutManager.getOrientation()));
Hope this will solve your problem.
You didn't notify your adapter after setting the value. While you setting the adapter messages is empty. When you adding the value in messages using addAll(message_objects) those data are added in ArrayList but you have to notify the adapter using notifyDataSetChanged(). Declare your adapter in class level then create object of adapter before setting the adapter in recyclerview and notify the adapter after you added objects in ArrayList.
private ChatAdapter chatAdapter;//declare it globally(class level)
chatAdapter = new ChatAdapter(messages, R.layout.chat_send);
reyclerview_message_list.setAdapter(chatAdapter);
reyclerview_message_list.setLayoutManager(new LinearLayoutManager(this));
reyclerview_message_list.setItemAnimator(new DefaultItemAnimator());
reyclerview_message_list.addItemDecoration(new DividerItemDecoration(getApplicationContext(), layoutManager.getOrientation()));
messages.addAll(ChatMessage_Objects_you_getting_from_web_service);
chatAdapter.notifyDataSetChanged();
Forgive me for my English.
My list contains 100 items. Each item consists of two checkboxes and I want to scroll to the next item each time a checkbox is clicked.
please give me the best answer link If this question has already been answered
this is my custom adapter
public class CustomAdapter extends
RecyclerView.Adapter<CustomAdapter.MyViewHolder> {
private ArrayList answerFirst;
private ArrayList answerSecond;
private Context context;
public CustomAdapter(Context context, ArrayList questionList, ArrayList
answerFirst, ArrayList answerSecond) {
this.context = context;
this.answerFirst = answerFirst;
this.answerSecond = answerSecond;
}
#Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v =
LayoutInflater.from(parent.getContext()).inflate(R.layout.test_items,
parent, false);
return new MyViewHolder(v);
}
#Override
public void onBindViewHolder(final MyViewHolder holder, final int position)
{
holder.firstanswer.setText(answerFirst.get(position).toString());
holder.secondanswer.setText(answerSecond.get(position).toString());
}
#Override
public int getItemCount() {
return questionList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
TextView question;
CheckBox firstanswer;
CheckBox secondanswer;
public MyViewHolder(View itemView) {
super(itemView);
question = (TextView) itemView.findViewById(R.id.question_text);
firstanswer = (CheckBox) itemView.findViewById(R.id.first_answer);
secondanswer = (CheckBox) itemView.findViewById(R.id.second_answer);
}
}
}
this is the main activity
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_start_test);
final RecyclerView recyclerView = (RecyclerView)
findViewById(R.id.recyclerView_test);
final LinearLayoutManager linearLayoutManager = new LinearLayoutManager(getApplicationContext());
recyclerView.setLayoutManager(linearLayoutManager);
final CustomAdapter customAdapter = new CustomAdapter(mainActivity.this, answerFirst,answerSecond);
recyclerView.setAdapter(customAdapter);
}
You can do that by making the adaptor class inside the main class and in the listener method of checkbox scroll to the required position as the RecyclerView is a global variable you can access it and scroll to required position.
rv.scrollToPosition(youPositionInTheAdapter)
else pass the instance of RecyclerView in the constructor and do the same
and to get the current item position inside the adaptor by getAdapterPosition()
or you can do it with layout manager like this
rv.getLayoutManager().scrollToPosition(youPositionInTheAdapter)
I having a recyclerview with GridLayoutManager, it populating the grid properly but not updating the data.
Below is my code,
public class AppsGridViewAdapter extends RecyclerView.Adapter<AppsGridViewAdapter.GridViewHolder>{
private ArrayList<App> appArrayList;
private Context context;
public AppsGridViewAdapter(Context context,ArrayList<App> appArrayList){
this.appArrayList = appArrayList;
this.context = context;
}
public static class GridViewHolder extends RecyclerView.ViewHolder{
CompoundAppButton compoundAppButton;
public GridViewHolder(CompoundAppButton itemView){
super(itemView);
compoundAppButton = (CompoundAppButton)itemView;
}
}
#Override
public GridViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
CompoundAppButton appButton = new CompoundAppButton(context,null);
return new GridViewHolder(appButton);
}
#Override
public void onBindViewHolder(GridViewHolder holder, int position) {
App app = appArrayList.get(position);
holder.compoundAppButton.updateButtonConfig(app);
}
#Override
public int getItemCount() {
return appArrayList.size();
}
}
Having valid values in the list, but not updating. Where CustomAppButton is a customview. Anyone can help me why it doesnt update.
UPDATE:
I calling recyclerview from my activity, below is the specific code
recyclerView = (RecyclerView)findViewById(R.id.recycler_view);
recyclerView.addItemDecoration(new MarginDecoration(this));
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new GridLayoutManager(this, 3));
AppsGridViewAdapter adapter = new AppsGridViewAdapter(this,appList);
recyclerView.setAdapter(adapter);
The activity contains only recyclerview.
updateButtonConfig is a function in CustomAppButton class, this is where view is updated. getting data to this function, have checked the log.
public void updateButtonConfig(App app){
Picasso.with(context)
.load(app.getAppIcon())
.placeholder(R.drawable.app_icon)
.into(appIcon);
appName.setText(app.getAppName());
category.setText(app.getAppCategory());
price.setText(app.getAppPrice());
appPackage = app.getAppPackage();
}
Here is my adapter class
public class CategoryAdapter extends RecyclerView.Adapter<CategoryAdapter.ViewHolder> {
List<CategoryItem> mItems;
public CategoryAdapter(Context context) {
super();
Resources res = context.getResources();
mItems = new ArrayList<>();
mItems.add(new CategoryItem(res.getString(R.string.category_book), R.drawable.books));
// ... few items
mItems.add(new CategoryItem(res.getString(R.string.category_clothing), R.drawable.clothes));
}
#Override
public ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
View v = LayoutInflater.from(viewGroup.getContext())
.inflate(R.layout.item_category_selection, viewGroup, false);
ViewHolder viewHolder = new ViewHolder(v);
return viewHolder;
}
#Override
public void onBindViewHolder(ViewHolder viewHolder, int i) {
CategoryItem category = mItems.get(i);
viewHolder.title.setText(category.getTitle());
viewHolder.thumbnail.setImageResource(category.getThumbnail());
}
#Override
public int getItemCount() {
return mItems.size();
}
class ViewHolder extends RecyclerView.ViewHolder {
public TextView title;
public ImageView thumbnail;
public CardView card;
public ViewHolder(View itemView){
super(itemView);
card = (CardView)itemView.findViewById(R.id.card_view);
title = (TextView)itemView.findViewById(R.id.category_title);
thumbnail = (ImageView)itemView.findViewById(R.id.category_thumbnail);
}
}
}
My fragment
public class CategorySelectionFragment extends Fragment {
RecyclerView mRecyclerView;
RecyclerView.LayoutManager mLayoutManager;
RecyclerView.Adapter mAdapter;
public CategorySelectionFragment() { }
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.fragment_category_selection, container, false);
mRecyclerView = (RecyclerView)v.findViewById(R.id.recycler_view);
setUpGrid();
return v;
}
private void setUpGrid() {
mRecyclerView.setHasFixedSize(true);
colNum = 3;
mLayoutManager = new GridLayoutManager(getActivity(), colNum);
mRecyclerView.setLayoutManager(mLayoutManager);
mAdapter = new CategoryAdapter(getActivity());
mRecyclerView.setAdapter(mAdapter);
}
When fragment just created (onCreateView called) recyclerview works perfectly, but when app goes to background and then restore scroll start to freeze on the first few items and then continue to work smoothly.
When app restore from background onCreateView method is not called so I try to set up adapter for recyclerview in onStart(), like this:
#Override
public void onStart(){
super.onStart();
// Adapter setting here to avoid freezes, when start to scroll after switching to an app from background.
mRecyclerView.setAdapter(mAdapter);
}
This approach has solved the problem, but it seems like not realy clear way to solve that issue. Since for example, restoring the fragment leads to reset last scrolled position.
Thanks for your help!