问题
I have a recycler view(A) containing another recyclerview(B). When I click on the plus icon in recyclerview(A) item, it opens up a new activity with a recyclerview(C). Long pressing and selecting few items and clicking on done. This needs to update a recyclerview(B) on recyclerview (A) item on which I clicked the plus icon.
But instead, all the items of recyclerview(A) which contains recyclerview(B) is being updated.
private void displayUpcomingEvents(View view) {
upcomingEventsArrayList = new ArrayList<>();
upcomingEvents = new UpcomingEvents("Meet and greet", "Coffee Connect | ", "Phython", "21 - ", "Jun - ", "22", "Jun", "21 Jun 10 AM", "Washinton");
upcomingEventsArrayList.add(upcomingEvents);
upcomingEvents = new UpcomingEvents("Meet and greet", "Coffee Connect | ", "Phython", "21 - ", "Jun - ", "22", "Jun", "21 Jun 10 AM", "Washinton");
upcomingEventsArrayList.add(upcomingEvents);
upcomingEvents = new UpcomingEvents("Meet and greet", "Coffee Connect | ", "Phython", "21 - ", "Jun - ", "22", "Jun", "21 Jun 10 AM", "Washinton");
upcomingEventsArrayList.add(upcomingEvents);
upcomingEventsAdapter = new RecyclerAdapterUpcomingEvents(getContext(), upcomingEventsArrayList);
recyclerView = (RecyclerView) view.findViewById(R.id.recycler_view_upcoming_event);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getAppContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(upcomingEventsAdapter);
}
class RecyclerAdapterUpcomingEvents extends RecyclerView.Adapter<RecyclerAdapterUpcomingEvents.MyViewHolder> {
private List<UpcomingEvents> upcomingEventsList;
private Context context;
private LayoutInflater inflater;
RecyclerAdapterUpcomingEvents(Context context, List<UpcomingEvents> upcomingEventsList) {
this.context = context;
this.upcomingEventsList = upcomingEventsList;
inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View rootView = inflater.inflate(R.layout.card_view_upcoming_event, parent, false);
return new RecyclerAdapterUpcomingEvents.MyViewHolder(rootView);
}
@Override
public void onBindViewHolder(MyViewHolder holder, int position) {
UpcomingEvents upcomingEvents = upcomingEventsList.get(position);
holder.eventUpcomingName.setText(upcomingEvents.getEventUpcomingName());
holder.eventUpcomingType.setText(upcomingEvents.getEventUpcomingType());
holder.eventUpcomingDate.setText(upcomingEvents.getEventUpcomingDateStart() + upcomingEvents.getEventUpcomingDateEnd());
holder.eventUpcomingMonth.setText(upcomingEvents.getEventUpcomingMonthEnd() + upcomingEvents.getEventUpcomingMonthEnd());
holder.eventUpcomingAlarmNotify.setText(upcomingEvents.getEventUpcomingAlarmNotify());
holder.eventUpcomingPlace.setText(upcomingEvents.getEventUpcomingPlace());
holder.eventUpcomingAddPeople.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Activity origin = (Activity) context;
origin.startActivityForResult(new Intent(getAppContext(), ContactsActivity.class), CONTACT_CODE);
}
});
holder.contactRecyclerView.setLayoutManager(new LinearLayoutManager(context, LinearLayoutManager.HORIZONTAL, false));
contactAdapter = new ContactAdapter(getAppContext(), R.layout.card__contact_image, contactsList);`enter code here`
holder.contactRecyclerView.setAdapter(contactAdapter);
}
@Override
public int getItemCount() {
return upcomingEventsList.size();
}
class MyViewHolder extends RecyclerView.ViewHolder {
private TextView eventUpcomingName, eventUpcomingType, eventUpcomingDate, eventUpcomingMonth, eventUpcomingAlarmNotify, eventUpcomingPlace, eventUpcomingYes, eventUpcomingInterested, eventUpcomingNo;
private ImageView eventUpcomingAddPeople, eventUpcomingmore;
private RecyclerView contactRecyclerView;
MyViewHolder(View itemView) {
super(itemView);
eventUpcomingName = (TextView) itemView.findViewById(R.id.event_name);
eventUpcomingType = (TextView) itemView.findViewById(R.id.event_type);
eventUpcomingDate = (TextView) itemView.findViewById(R.id.event_date);
eventUpcomingMonth = (TextView) itemView.findViewById(R.id.event_month);
eventUpcomingAlarmNotify = (TextView) itemView.findViewById(R.id.event_time_notify);
eventUpcomingPlace = (TextView) itemView.findViewById(R.id.event_place);
eventUpcomingYes = (TextView) itemView.findViewById(R.id.event_yes);
eventUpcomingInterested = (TextView) itemView.findViewById(R.id.event_interested);
eventUpcomingNo = (TextView) itemView.findViewById(R.id.event_no);
eventUpcomingmore = (ImageView) itemView.findViewById(R.id.event_more);
eventUpcomingAddPeople = (ImageView) itemView.findViewById(R.id.hex_one_event);
contactRecyclerView = (RecyclerView) itemView.findViewById(R.id.upcome_events_recycler);
}
}
}
@Override
public void onReceived(int requestCode, int resultCode, Intent data) {
if (requestCode == CONTACT_CODE && resultCode == RESULT_OK && data != null) {
List<Contact> contactsLists = (ArrayList<Contact>) data.getSerializableExtra("contacts");
contactsList.clear();
contactsList.addAll(contactsLists);
contactAdapter.setContactList(contactsLists);
upcomingEventsAdapter = new RecyclerAdapterUpcomingEvents(getContext(), upcomingEventsArrayList);
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getAppContext());
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.setHasFixedSize(true);
recyclerView.setAdapter(upcomingEventsAdapter);
}
}
CardView
<android.support.v7.widget.RecyclerView
android:id="@+id/upcome_events_recycler"
android:layout_width="match_parent"
android:layout_height="52dp"
android:layout_below="@id/event_place"
android:layout_marginBottom="8dp"
android:layout_marginEnd="52dp"
android:layout_marginStart="8dp"
android:layout_marginTop="8dp">
</android.support.v7.widget.RecyclerView>
<ImageView
android:id="@+id/hex_one_event"
android:layout_width="48dp"
android:layout_height="48dp"
android:layout_alignParentEnd="true"
android:layout_below="@id/event_place"
android:layout_margin="8dp"
android:src="@drawable/hex_src_plus" />
回答1:
First change your code by this below :
holder.eventUpcomingAddPeople.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Activity origin = (Activity) context;
Intent i = new Intent(getAppContext(), ContactsActivity.class);
i.putExtra("selectedPosition", position);
origin.startActivityForResult(i, CONTACT_CODE);
}
});
@Override
public void onReceived(int requestCode, int resultCode, Intent data) {
if (requestCode == CONTACT_CODE && resultCode == RESULT_OK && data != null) {
int result = data.getIntExtra("selectedPosition","put a default value in case of null");
List<Contact> contactsLists = (ArrayList<Contact>) data.getSerializableExtra("contacts");
contactsList.clear();
contactsList.addAll(contactsLists);
contactAdapter.setContactList(contactsLists);
upcomingEventsAdapter.notifyItemChanged(result);
}
}
on the second activity you should have something like that when you click on done :
int param = getIntent().getIntExtra("selectedPosition");
Intent resultIntent = new Intent();
resultIntent.putExtra("contacts", Your selected contacts);
resultIntent.putExtra("selectedPosition", param);
setResult(RESULT_OK, resultIntent);
finish();
Hope it's clear and helpful :)
来源：https://stackoverflow.com/questions/44910187/recyclerview-with-in-recyclerview-with-start-activityonresult