Develop Reference

Access Adapter items of Recyclerview

I'm using Recyclerview to show a list. I want to delete some items like IOS. In my listview template I have added a button to delete item which is invisible by default. In my activity I have another button attached at bottom (Not part of listview) and on tap of this button I want to make all delete buttons of listview visible.
My Question is how can I get reference to all delete buttons of listview in activity and is it the right way to do this?
Thanks

Assuming you have ViewHolders set up, you already have references to all the buttons in your list. All you have to do is to make them visible for every item in the list with a simple loop.
In case you haven't implemented ViewHolders I suggest you check out the documentation and take a look at some simple tutorials on how to use them.
On a side note. If I understood correctly you're making a bottom tab for your app and since you referenced iOS I gotta say this; Remember that Android and iOS are two unique operating systems with their own ways of handling things. Check out Googles pure Android documentation.

In your question title you say RecyclerView, but in your text you say ListView. The solution is similar either way, but it's best to be perfectly clear what you're doing.
In either case, there are at least two different solutions.
First, you could use a boolean flag to determine if all the the item buttons should be showing or not. You check this flag at the time the item view is inflated or created and toggle the button accordingly. If the boolean flag is ever changed, the easiest thing to do is tell the RecyclerView/ListView that the underlying data has changed and to redraw all the views. Call notifyDatasetChanged on the adapter.
The other thing you can do at the time the item buttons should change is iterate all the visible item views, find the button, and change its visibility. With RecyclerView, you can do this, and with ListView you can do this.

Android ListView custom row overlay

I am developing an activity with a ListView in which I need to change the current row by another layout by clicking on the row, and I'm not finding any way to do as much as I look (I take hours searching for possible solutions and I have not seen any reference to this problem). I do not know if this can be done in Android, but if anyone has an idea of ​​how to do this would be appreciated.
Thanks in advance.
PS: The ListView control is normal and just want to replace a layout with a different layout. I'm using the API 15.

Use a ViewSwitcher
http://developer.android.com/reference/android/widget/ViewSwitcher.html
A ViewSwitcher is -
ViewAnimator that switches between two views, and has a factory from
which these views are created. You can either use the factory to
create the views, or add them yourself. A ViewSwitcher can only have
two child views, of which only one is shown at a time.

I suggest merging the two layouts in a single one and hide the second one. In your adapter data you should have a flag or something to indicate which layout to display. When you click a row, toggle that flag for the selected item and notifyDataSetChanged() on the adapter. This will make sure the changed layout remains even if you scroll up and down and the row goes off screen.
A more optimized solution is to have different item types in the adapter.

Which is the better method in Android for creating a dynamic list?

If you are creating a very dynamic list, say, where every row can have a different set of input types plus optional buttons, and the list length is based on another dynamic value, is it better to do this in a list adapter or creating a custom view in a scroll window?
After struggling with list adapters for quite a while now something finally occurred to me- this seems dumb. It seems like I am going through a lot of work keeping track of what spinner is set to what value, which row was clicked and so forth.
For example, say you are showing something like a contacts screen with various details that can be entered about a contact. Some rows will have text inputs (name, address etc), some will have spinners (ie. state, group), some will have checkboxes (like 'favorite' or something). Also, there is an 'add' button that allows you to add another field to edit. Is it worth making this in a list adapter or is it better to populate a custom view, and if the "add" button is clicked, we re-create the custom view, adding a view of the type they want to add?
I hope this is clear.

ListViews (and List Adapters) are meant for data that is to be displayed in mainly similar views. For your example, it is much easier and more natural to have a predefined layout file with the screen and use view visibility so select which views are to be shown. If you need to add views to the screen you can do this dynamically by using findViewById on the layout and then using it's addView method.
Let me know if you need more clarification or sample code...

Mono for Android: Listview scrolling issue with spinners and edit text

My problem is on two fronts.
First issue: Scrolling amnesia
I have a ListView with spinners and edit texts. It acquires it's data from webservice. The problem is when I write up a value on the EditText or select something for the spinners and scroll them out of view. When I come back the fields are empty and the spinners are again in their default selection.
Attempted solution
I have tried resolving the issue by setting ScrollingCacheEnabled programmatic and within the AXML file to both true and false just to see if that is an issue. It seems not to have any kind of an effect.
Second issue: Focus Loss
When I touch the EditText within this same ListView I get the keyboard to appear but I loose the focus on the field and it needs to get touched again to get focus and it allows me to be written.
Attempted solution
I fiddled with setting the fields focusable, Focusavle in toucmode, touchable and whatnot but came out empty handed.
Honestly I am quite new to android and to programming on this level as well but I tried my best on this. I might have just missed something due to lack of knowledge or it's just something somebody with more experience could tackle and solve.
The second issue isn't that bad for now (still after filling out quite a number of fields it does get tiring to set it twice...) but the scrolling issue is a must.

I think you problem relates to that you forget to update the items in the Adapters when you alter the Views containing them. So you need to wire up the events from the Views to update the items.
Why? If you look carefully at your Adapter for you ListView you populate the convertView with the values of GetItem(position). So if that item does not reflect the changes you have made to the View you are bound to get the initial values of that item.
So what you need to do is to hook up SpinnerValue.ItemSelected and all the other Views which can be altered events, so that the items in the Adapter get their values updated. Remember to only add event handlers when you first create the View. So that is when convertView is null.
Also consider changing the lines:
if (SpinnerValue.Adapter.Count.Equals(2))
{
SpinnerValue.SetSelection(1);
}
To be based on the items in the Adapter rather than setting it to 1 every time.
You focus problem is based in that ListView is not really made for having Views inside of it wanting the focus. Try setting the ListView DecendantFocusability when you instantiate it to DescendantFocusability.AfterDescendants like so:
lstPrevzem.DescendantFocusability = DescendantFocusability.AfterDescendants;

I resolved the issue by replacing the listview with LinearLayout and pinning the adapter to it. The "fixed" code is available on pastebin.
Fixed code:
http://pastebin.com/vn3SPrFz

Android : Multiple Actions on a List View - Focus Issue

I would like to implement a ListView, which I can do no problem w/ my cursor. Right now depending on which row you click on it takes you to a new activity based on the information pressed on that row (just like it should, and as expected). I would like to have a button however to delete the row, so a user can press any part of the row to launch the new activity, but if they press the button on that row, it deletes the row (or launches a delete activity/function).
If you can look # DroidRecord, they have a similar layout as I am looking to achive.
Thanks!
Chris.

As Mariano Kamp said, adding buttons to a row will make it "untouchable", but in my experience, this problem goes away if you set these properties on the buttons:
android:focusable="false"
android:focusableInTouchMode="false"
See also How to fire onListItemClick in Listactivity with buttons in list?

Another possible workaround - you can use an ImageView instead of the button, and set the ImageView's onClickListener (For example, when you're inflating the cell view).
ImageView is not focusable so it doesn't prevent OnListItemClick() from being dispatched, and when you click on the image only the image's listener fires.

what is your question? How to add a button to a list row?
Very simple, just as you expect it will be added to the row's layout.
Unfortunately though that will also make the whole row "untouchable". The Google developer I asked said that this is by design (as far as I remember), and that you should use TouchDelegate to cope with this. As there are no samples, not even in the android source, and only very thin documentation that didn't work for me
Anyway, it seems that not many applications use a button in the list row. I only know about mine (newsrob, see Articles List) and the Alarm clock. Maybe you could use a context menu?
Otherwise the ugly solution would be to add to call setOnClickListener() on your row view in the getView method.
Cheers

It's not the answer to your question, but the long-click/tab is generally the place to pop up a context menu and put extra actions, like delete. You can read how to do it here: How do you implement context menu in a ListActivity on Android?

I would like to thank BoD for its hint on removing the focusable state to the button(s), it saved my day.
But for information, since the button is no more focusable - state_focused on < selector > xml - , its design won't display anymore to the user.
Those buttons will still get the state pressed though, but also when clicking anywhere else on the parent view (anywhere BUT another button) !
Keep that in mind, it could not be a good solution for your own case, but it does work well.

I tried this to be able to click on the buttons but it didn't work for me
android:focusable="false"
android:focusableInTouchMode="false"
so what I did was to change the activity layout to scrollview and then add a linerLayout inside of it.
after that you can add buttons to the layout and each button will be clickable.