It's hard to point at one specific place and say "this is the issue," since there's a lot of code. But it boils down to the fact that there's only a single List<QuestionsToTeacher> questionsToTeacherList inside AdapterAskTeacherList.
Instead, you should have a List<List<QuestionsToTeacher>>. That is, a list of lists.
To accomplish this, you'll have to change both the Activity and the outer Adapter. In the activity, change this:
public ArrayList<QuestionsToTeacher> questionsToTeacherList = new ArrayList<>();
...
for(DataSnapshot messagesLabel: subChapterData.getChildren())
{
//Messages Data
for(DataSnapshot messagesData: messagesLabel.getChildren())
{
String messageQuestion = gson.toJson(messagesData.getValue());
QuestionsToTeacher questionsToTeacher = gson.fromJson(messageQuestion,QuestionsToTeacher.class);
//Problem start here
questionsToTeacherList.add(questionsToTeacher);
System.out.println(questionsToTeacher.messages+" "+questionsToTeacher.questionStatus);
}
}
to this:
public ArrayList<ArrayList<QuestionsToTeacher>> questionsToTeacherList = new ArrayList<>();
...
for(DataSnapshot messagesLabel: subChapterData.getChildren())
{
ArrayList<QuestionsToTeacher> sublist = new ArrayList<>();
//Messages Data
for(DataSnapshot messagesData: messagesLabel.getChildren())
{
String messageQuestion = gson.toJson(messagesData.getValue());
QuestionsToTeacher questionsToTeacher = gson.fromJson(messageQuestion,QuestionsToTeacher.class);
//Problem start here
sublist.add(questionsToTeacher);
System.out.println(questionsToTeacher.messages+" "+questionsToTeacher.questionStatus);
}
questionsToTeacherList.add(sublist);
}
What you're doing here is taking the ArrayList<QuestionsToTeacher> (the list of questions) and changing it to an ArrayList<ArrayList<QuestionsToTeacher>> (a list of lists of questions). And then, as you read the data out of the database, you create multiple ArrayList<QuestionsToTeacher> and add them to the list of lists.
Then, in your adapter, change this:
private List<QuestionsToTeacher> questionsToTeacherList = new ArrayList<>();
public AdapterAskTeacherList(List<AskTeacherItems> askTeacherListItems, List<QuestionsToTeacher> questionsToTeacherList, Context context) {
...
this.questionsToTeacherList = questionsToTeacherList;
...
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
...
AdapterQuestionToTeacher adapterQuestionToTeacher = new AdapterQuestionToTeacher(questionsToTeacherList);
view.recyclerView.setAdapter(adapterQuestionToTeacher);
...
}
to this:
private ArrayList<ArrayList<QuestionsToTeacher>> questionsToTeacherList = new ArrayList<>();
public AdapterAskTeacherList(List<AskTeacherItems> askTeacherListItems, ArrayList<ArrayList<QuestionsToTeacher>> questionsToTeacherList, Context context) {
this.questionsToTeacherList = questionsToTeacherList;
...
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, final int position) {
...
List<QuestionsToTeacher> sublist = questionsToTeacherList.get(position);
AdapterQuestionToTeacher adapterQuestionToTeacher = new AdapterQuestionToTeacher(sublist);
view.recyclerView.setAdapter(adapterQuestionToTeacher);
...
}
Again, you're changing the adapter to accept a list of lists of questions (instead of just a list of questions). The key is that you then pass only a single list of questions to each nested RecyclerView.
