im trying to create a feed like instagram. When the user reaches the bottom of the listview more pics should be added to the listview. Is there a way to add more to the listview with out calling notifyDataSetChanged() because it causes the listview to flicker.
Try creating a new Adapter or re-initializing the Adapter being used with added data then set that Adapter to the ListView.
Then use setSelection(int position) to move to the bottom of the ListView.
Related
Hi I have two recyclerview in my app. I am loading data and fill the recyclerview with it. at bottom i have one button , lets say when user load the app, first recylcerview is visible, now user click on bottom button I am hiding first recyclerview and make second recyclerview visible. so now issue is Toast messages of first recyclerview's adapter is still appears even it is hide state.
I do not want to show Toast messages of first recyclerview when it is hide.
recyclerViewfirst.setVisibility(View.VISIBLE);
recyclerViewsecond.setVisibility(View.GONE);
Please follow these steps :
No need for setting visibility for RecyclerView.
Pass Empty ArrayList to your adapter and set adapter to RecyclerView.
Adapter mAdapter;
ArrayList<String> mList = new ArrayList<>();
mAdapter = new Adapter(context, mList);
recyclerViewsecond.setAdapter(mAdapter);
When data is there in ArrayList simply notify the adapter.
mAdapter.notifyDataSetChanged();
Don't pass any data for first RecyclerView when you click the button. That is you can display RecyclerView again with empty data.
no needs to hide the recycle view
just reset the adapter with another array list and notify the adapter
then first list data will replace with another list data
In my android application, I have one spinner box and two edit text box for adding item.When I click on add button all the data will store in database and display in below Item list (listview display in my first image) by refreshing listview.
My problem is, when I click on add button at a time only one list is display and listview heading is also gone.
May be this problem is raised due to refreshing of listview.
I searched on google and found notifyDataSetChanged() method is used for refreshing list view but I don't know how notifyDataSetChanged() method is used in fragment?
Does anybody know how to use this method in fragment?
I am new to fragment. In my app all the java code is developed using fragment activity, and xml file is simple layout.(LinearLayout/RelativeLayout)
You can see my screen here:
1)First image show list heading.
2)Second image show List item.
You need to setAdapter again to your listview after adding new data. it will show new data int listview.
if not get, post your code where you setAdapter to listview.
You have to first add item in Arraylist/List which you passed in Adapter then after you can call below code..
adapter.notifyDataSetChanged();
listView.invalidateViews();
My problem is how can i update list view within view pager.
i am using the same 4 tabs having a list view with different arraylist set to there adapters.
I am using only one fragment and bases of tabs position I am loading different list data to inner fragment arrayAdapter. Also I have two buttons one is delete and another one is Add.
What I want: If I press the add button then it should add new data to the array list(based on the tab position add the new add to respective arrayList) and refresh the listview data.
Use onPageSelected(int position) from your Pager to figure out at what Array you have to add items.
Then, after you add that new item to Array, you should set ArrayAdapter again for those ListView since list has changed.
Then call notifyDataSetChanged() on your Adapter object once you've modified the data in that adapter to refresh ListView.
Edit: you don't have to use constructor for changing ArrayAdapter, this should work:
ArrayAdapter.clear();
ArrayAdapter.addAll(changedArray);
ArrayAdapter.notifyDataSetChanged();
The situation:
I have an activity with a spinner and a list with a BaseAdapter.
The list is loaded once, and shows correctly... But when I click on the spinner to change the underlying data and call adapter.notifyDataSetChanged(); the list doesn't refresh.
By this I mean that the data is changed and the adapter has the right data, it's just that the listView doesn't change the view.
How to force the listViews to show the right data?
Try adapter.notifyDataSetInvalidated(); as well as adapter.notifyDataSetChanged();
EDIT:
Clear your ArrayList or whatever you're using before you add more items with something like .clear(); and then add the new items and call adapter.notifyDataSetChanged();
Try
myListView.invalidateViews();
How can I recreate listView?
I have listView with items containing few TextViews and I want, to reaload ListView and hide part of those TextViews from every row. I tried setting new adapter, clearing adapter (it makes listView empty), invalidating listView, using notifyDataSetChanged(). Nothing forced ListView to recreate items.
Use a ArrayAdapter backed by an ArrayList. To change the data, just update the data in the list and call adapter.notifyDataSetChanged() - Robby Pond
Also please check Google I/O 2010 - The world of ListView