Im trying to achieve this recyclerview layout with arrow button that will trigger scrolling item
then, I have 2 choice to manipulate the view
Split the list inside adapter
Split the list inside viewmodel and bind it into adapter separately.
What should I choose between 2 of them. Or if you guys have any better idea please comments :)
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So, I have a recyclerview with multiple view types. I'm using this link to generate my adapter class, becauseI have multiple viewholders in my recyclerview. Now the problem I have is with collapsing certain items inside it. What I want is whenever I press
the green toggle, item 2 and 3 in the list should collpase but 4,5,6 should remain upon,unless you have clicked on the green item ofcourse. I tried many ways to approach this but I can not achieve this with the link provided. Is there any way I can achieve this?
When you click collapsing button you have to remove your collapsing data from your all source list. When you remove your item from your list recyclerView automatically animates it.After that when you want to show it again you have to insert it your list again and notify that.RecyclerView also animates again when you insert it. There is a useful link here for inserting and removing special data from recyclerView https://medium.com/#suragch/updating-data-in-an-android-recyclerview-842e56adbfd8
Let me explain this--
For example - I have a custom list view set up that shows 3 text fields in a group.. I.e. each click able item in that list view will have 3 texts.. so now I want to get the 2nd text view at the 5th index of that listview...How to achieve this?
If a have a basic listview with only one item at each index, then this can be achieved by using getItemAtPosition().
Is this similar in the above case also?
You don't. THe entire point of a listview is that it DOESNT create views for every element in the list- only the ones on screen. So if your list is more than trivially long, it probably doesn't have a view for that item. If you think you need this, you're probably architecting your code wrong for a listview.
I'm building an android app and I'm trying to replace a list view with another list view if you click a button, like the notifications page on Instagram. On that page, if you click on the top "following" button it will show you a listview of what your followers have liked. If you click on the "you" button it will show you a listview of what people have liked your photos.
Any help would be greatly appreciated!
You can do it by following ways,
1. add Two listviews and can change the visibility as per your requirement.
2. On button click you can load the other data into same list view and can update your adapter in the same list view.
in 1 you have to load two list view at first which will consume more time if data is larger sure you can write a login in asynctask to load list views in background thread.
in 2 you have to update your adapter at the button so you will have to provide some progress bar of dialog for user while you list view is getting update.
You can use either of this whichever suites you best.
Simply , You don't need to switch Listview , you only need to switch adapters .
eg, you can switch to mFollowingAdapter when clicked on Following button and switch to mYouAdapter when you select "You" tab. that's it.
You should write a list, that has a custom adapter. This adapter will be able to display BOTH views you want to display.
If the data to be displayed is the same format (ie. both have an imageview next to a textview), you are in good shape.
When you want to switch to a different list, get the information you would like to display, replace the data in your the collection backing your list, then notify the list that the data has changed, and it should redraw.
So, this might look like:
create ArrayList() with data A
setup List, with this data and display
replace the ArrayList() with data B
call listView.notifyDataSetChanged
You can still do this if the Data A, and Data B have different views, in this case, you would need to handle this logic in your custom adapter.
I have a Listview in my Android app, and I want there to be some horizontal lines when the list is empty to indicate to the user that this is a List. I know that there is the setEmptyView method on ListView, but I'm not sure what to put in that view if I want there to be list rows with horizontal lines. How would I accomplish this?
Having a bunch of horizontal lines for an empty list is an iOS convention. If you want your app to fit in with Android better you should set something else. Perhaps notify the user there was an error or that there are no items in the list. You can add this right to your layout.xml file if you're using a ListActivity. All you need to do is create a view and give it the id #android:id/empty.
put the listView in a FrameLayout and add another view in that Frame.
if you having any item in the list hide its (visiblity="gone") and show the other view.
OR
change your adapter to return multi ViewType
in your adapter if you have no item return other type of view
I have 2 ListView in a layout. I want each ListView show all their items. And scroll the whole layout.
A answer from one of the ListView Developers from the GoogleIO is: Never put a ListView in a ScrollView. This means if you want a ListView that is not scrolling as you are trying to do you maybe don't need a listview at all.
You could create a ListView put a Linearlayout in it and use the Adapters from the two Listviews to manually add the items of the list via linearlayout.addView Now you have one scrollable view that contains all items of the list. Because there is no recycling and only loading of the items in the list this is very inefficient and only usable if you don't have that much items.
The second more complicated way that you can go if you have say 20 items in each list is to use a custom adapter that takes the two listadapters and let you put all the items in one list.