Delete an item from ListView on OnFling event

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+2 Q:

Delete an item from ListView on OnFling event

Hi I want to delete an item from a ListView, to which have attached a GestureListener. I have overridden the method onFling for that GestureListener to return true of false based on my criteria.

But I don't know how to fetch the last selected item in the ListView. Fling does not select an item in ListItem.

I am short on time, Could somebody please help. Thanks Nayn

+1 A:

You do not "delete an item from a ListView".

You need to delete a row from the underlying Adapter. If this is an ArrayAdapter, call delete() on it. If this is a CursorAdapter, call delete() on the database or content provider, then call requery() on the Cursor.

CommonsWare 2010-06-25 12:05:51

How to find which item to delete?

Nayn 2010-06-25 16:39:23

I have no idea. You're the person trying to do a delete based on a fling. There is no "last selected item in the ListView" if the user is working with the touchscreen. Presumably, when you initiate your fling, you will need to determine which item the user's finger was on at the time.

CommonsWare 2010-06-25 17:36:10

hmm. I guess flinging on the screen from left to right for a specific item would seem as if user is throwing it out. So I really want to have that event registered for each item inside the ListView. I'll figure out some other way and update here.

Nayn 2010-06-27 11:30:05

@Nayn: Ah! Now I understand what you're trying to do! Actually, I have some code for that, extracted from the Music app in the open source project. Check out http://github.com/commonsguy/cwac-touchlist for a `TouchListView` that supports drag-and-drop, including dragging an item to the screen edge to remove it from the list. It may not meet your needs exactly, but it will demonstrate the techniques. I am far from an expert on the touch events -- like I said, this is from code the Android team used on the Music app -- but it may give you some ideas.

CommonsWare 2010-06-27 16:42:23

Thanks for the pointer Mark.

Nayn 2010-06-28 08:48:50

Hi Mark. The page does not exist : github.com/commonsguy/cwac-touchlist.git

Nayn 2010-06-29 06:56:20

@Nayn: the link works for me. Note that the link does not have the .git on the end.

CommonsWare 2010-06-29 09:21:03

Actually i didn't notice the link to download source. I wanted to import the jar instead of using the raw source code. Do you have it uploaded as jar Or should I create it by myself?

Nayn 2010-07-01 12:22:03

@Nayn: You cannot package it as a JAR, as it has things that need to live outside of a JAR (e.g., the attributes). It is already packaged as a parcel -- see http://andparcel.com for more information about parcels.

CommonsWare 2010-07-01 13:18:56

Perfect. I did not know parcel way of reusing things in android. Thanks.

Nayn 2010-07-01 16:25:32

ansaurus

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Delete an item from ListView on OnFling event

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