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How to update a listview item via adapter

It's easy to remove, add and insert an item from the listview adapter object, but I don't think I see a direct method to update an item in the listview adapter. Obviously, I could simply replace via remove/add, but I want to make sure I'm not missing something obvious.
Right now, I'm simply updating the underlying Item Array and refresh the entire listview by recreating/assigning the adapter (probably also not very elegant).
I hope the question is clear enough.

If you are using ArrayList in adapter class for update In ArrayList there is method called set() which update the item in arraylist after updation call notifyItemchanged() which update an item in listview
Check this link

ItemAdded Event - ListView

Is there is any equivalent to ItemAdded event in android listview?
basically I want to check if the new item has some attributes or values then I will do some coloring on it.
I don't want to loop over all items once loading is done, even though I have no idea how to do it :)

You need to update the data that is used in the adapter in your listview.
After updating the data.. there is one method in adapter called notifyDataSetChanged() which will refresh the adapter.
Now in adapter's getView() method,
implement the logic that can change the color..
Hope it will help you..!!

List focus on a particular item in that list dynamically

In my project i have a ListView for handling the list of a product. In that i have a list of 100 Items in that List view. Each and Every time i have been seeing the first row of the ListView..
If i need to see the data in the ListView Means, i need to scroll down, Can i focus directly to a particular item by any function by passing the position(ID) of the ListView..
For Example this is my ListView that contains 11 items in it..
I'm seeing every time the ListView as the following,..
And my try is, If i give the ListView position as ID=5 means, can i get the Focus of the ListView as follow, in the opening itself...
Can we get this by ListFragment method or anything else?
Suggest me for the Best..

try this, use setselection
listview.setSelection(position);

Don't know about ListFragment but in listview, you can use listview.setSelection(position);
This method will help you to achieve this
for example: listview.setSelection(5);

How to add list item in android dynamically?

In my android application I want simple list which should be initially blank when I add item it would my root list item. Further, when I add more item in that list it all should be under that root list item and it should keep number of item added under that root list .
How can I achieve this?

Have a look this answer listView dynamic add item
In this code we are add data at run time.
first of all we set the an empty adapter to listview after that at run time we add the new item on button click

If you want nested items then your best bet is to use the ExpandableListView http://developer.android.com/reference/android/widget/ExpandableListView.html
If you want more than one level of nesting then I do not believe there is anything out-of-the-box to achieve this.

Just use an ArrayAdapter to show items on the list.
When you need to add items just add them to the array and call notifyDataSetChanged();

ListView always on top

I use below code to update listview.
setListAdapter(MyAdapter);
MyAdapter.notifyDataSetChanged();
getListView().setEmptyView(empty);
But each time update, the list always show top one.
I want to let it only update data, but not focus on top.
How to do it?

Use a ArrayAdapter backed by an ArrayList. To change the data, just update the data in the list and call
MyAdapter.notifyDataSetChanged().
Although you can call notifyDataSetChanged() on SimpleAdapter too.

You need to add listview.setSelection(your_collection.size());. This will make the last item in the ListView as selected when you refresh the ListView. Also call this after refereshing the ListView.