I have a long ListView, which its items are editable (simple strings).
The user can change the content as he/she wants.
My problem is, that when I want to retrieve the new data from the List view,
I can not reach the invisible items in the list.
How can I retrieve the data from these items without scrolling to these items?
Is there a way to fill the adapter ,with the new data the user entered to the list?
I think you can do that. if you have reference of Adapter for that list view
you can call getCount and then iterate and while calling getItem(pos) , to get data for all the positions in the list view.
Related
Suppose we have a bunch of files. I want to show them in a list that each item has some editable fields, user fills them and at the end, clicks on save button to make changes to items.
I tried a ListView with custom adapter having some EditTexts on it. but when I try to save, I don't know how to retrieve edited fields for each item and save changes to them. I think ListView is not for that purpose. It is just for representing items for user. What should I do?
Yes you can do this. Create arraylist of models which will hold all values inserted into editable and this arraylist will be in the activity class where listview is implemented. Then in list adapter handle click for editable based on position and whatever value is there in editable store it instantly in arraylist. That's it !
I have an empty ListView where the user should be able to add each list item manually at the press of a button. When the user clicks on the button, I have a place holder list item appear which contains an EditText. When the user edits the text and it loses focus, I want the source data set to be updated with the users input.
Dynamically add elements to a listView Android
Up to now, I found this answer which uses an ArrayAdapter that connects an ArrayList and my ListView but from my understanding, this only updates the ListView when the ArrayList is updated. To clarify, I want to do the opposite, i.e when the list item is changed within the ListView, I want the appropriate ArrayList (or whatever data source which would make this easier) item to be updated.
I'd appreciate any help with this.
Thanks in advance!
I would suggest storing the position you focus on, then when it loses focus, write the new data to the item in your arraylist by calling getItem(position); followed up by notifyDatasetChanged();
How do you call the ListView items - objects? or elements? or items? what is the right name for it?
You can call it whatever you want. I personally call it items
When referring to the model, i.e. arrays, I say objects.
From ListView
ListView is a view group that displays a list of scrollable items. The list items are automatically inserted to the list using an Adapter that pulls content from a source such as an array or database query and converts each item result into a view that's placed into the list.
So, I guess there's no mistake to talk about list items as simply items that are converted to views when the Adapter comes in.
I have a list view in an android program. Each row of this list view has a button. When user clicks one of these buttons, an action must be performed on data that is shown by that row.
How can I get access to that data and manipulate it?
Call getItem() on your Adapter to retrieve whatever the data is that is at that position within the Adapter. So, for example, if your Adapter is an ArrayAdapter<Restaurant>, getItem() will return the Restaurant for a given position.
I have a list view that fetch data from server when it scroll to bottom. once the data received it pass to the adapter via an array list.
But when i set the array list values to adapter, it appends the data and automatically the position moves to top.
Could some one tell me what is the problem occured here?
I guess that you recreated new Adapter and set it to your listview.
If you do like that, your listview will scroll to top.
To keep your listview item position, just call mAdapter.notifyDataSetChanged(); after update your array list.
Hope it can help you!