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.
Related
I have a problem with lists.
I want to implement a scrollable big list, each element of which contains a text on the left side and a NON-scrollable inner list on the right side. (for example: the name of the flat and the list of its inhabitants names)
Both lists should be filled from the cursors and contain an informatio about them: I want to have an oppurtunitz to get all cursos fields when I click an element of the inner list.
As far as I understood I's not possible to solve it with two ListViews. ExpandableListView does not pass me because I do not want to expand the first list, I want to have the inner list always visible.
Do you have any ideas how can I realize it?
Try using a ListView for your big list, and an empty LinearLayout in each item. You fill the LinearLayout of each item programmatically in the big list adapters getView(..) method, where int position is the item number.
See also: android nested listview
Edit: Or use an ExpandableListView, which items you expand programmatically without animation with expandGroup(int position, boolean animate). Prevent collapsing by setting an ExpandableListView.OnGroupCollapseListener, in which you expand the group again. (seems a bit hacky)
Dokumentation: https://developer.android.com/reference/android/widget/ExpandableListView.html
Just like a ListView but instead it doesn't scroll. Its content is added programatically via an ArrayAdapter. Is there any view that can be used for this purpose?
PS: Not LinearLayout, since it doesn't get its content from an adapter (I want the observer pattern)
Edit: Let me explain a little bit more. Suppose you need a list of items, but the list itself is not scrollable, what is scrollable is the screen.
That being said, the list of items should show ALL items, not a limited amount based on a fixed height. The way to go is LinearLayout as it is both non-scrollable and shows all items within itself.
But there is a third requierement. You don't want to add(View) directly, but instead, you want something similar to an ArrayAdapter so that you have a control of the items and their position, so you can handle on item click events based on their position. As far as I know, this can't be done using a LinearLayout. So my question is, does any view exist for this purpose?
You could try using a ListView, but disable scrolling, as described here
Put your layout inside a ScrollView and yes you have to use a Linearlayout. You need to set tag for each of your view that you add dynamically and whenever your view is clicked you can get it's position by view.getTag() and perform the required operation.
Note : Adding views at run time may affect performance.
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 am working on a UI where I have a list view. Each row has 2 information. One is Product name and the other is product ID stacked one over other. So each row has 2 lines of data.
What i want to do with this:
Once a user clicks on each row, it will further expand and show one input and one spinner. So it is basically for putting in Quantity and unit of measure.
Please let me know if this is achievable and if I can refer to some example.
What I need is more like
Taskos To Do List | Task List
https://play.google.com/store/apps/details?id=com.taskos&hl=en
All i need is that the category will not be expandable. Only the items will be expandable. All i need is an example of such app and then I can take it forward.
I think it could be done... you would need to put the extra widgets in your row layout, populate them and hide them upon list creation, then in your onListItemCLick you could unhide them.
Note I have no idea if this would work, but it seems reasonable that it might and it's what I would try and do to achieve the goal.
listView cannot be expanded. however you can use an expandablelistView
But the kind of functionality you want cannot be done this way(I guess.).
You can use
registerForContextMenu("your list View");
to register your list view
onCreateContextMenu
for the kind of action you want to be performed in your case its dialog with EditText and Spinner to have input from user
I have created one list view.. it is having 5 items...
Now I want split the list items...
when user clickon the first listitem or focus on first item then immediately it has to show followed some text views or other things..but it has to show same list..
and agian same when he clickon or focus on the second item that first item has to be close and second item has to act some thing....
I think you need to implement the concept of "Expandable Listview", so that the clicking on one item, it will be expanded with their sub-items.
Refer the android-sdk page of Expandable ListView: http://developer.android.com/reference/android/widget/ExpandableListView.html
For having an example, check this site: http://mylifewithandroid.blogspot.com/2008/05/expandable-lists.html
Pls, check the below image, do you want to perform as same ????
If you want to do the same, it is already given in the "API-Demos" at Views/Expandable Lists/1. Custom Adapter.
Enjoy !!
The problem is that you cannot use the standard ListView in your case, because in the standard ListView, the View of each row has to be one TextView.
In your case, you need it to be at least two TextViews (The standard Text, and the one that's gonna show up onClick/onFocus).
You have to create your custom ListAdapter, and override the getView() function.
Here is a code snippet that shows how to do it properly:
Custom Adapter
In the getView(), you have to inflate the XML file that describes your List Row, and return it.
In your case, I believe your XML file should contain 2 TextViews, one visible and one invisible.
Then, to handle the clicks, you can set a onItemClickListener on your ListView in your Activity class.
The best way may be to have your Activity class implementing onItemClickListener, and to use this onItemClickListener to handle those.
In the onClick() function, you just have to set the Visibility of your hidden TextView to VISIBLE.
You need to build custom rows, and handle showing more text on each row, there is no easy magicall way of doing it, but inflating your own rows, and setting a couple of attributes visibility isnt all that hard either.