Android :: Instant Refresh On CursorAdapter Attached To A ListView
Oct 14, 2009
I have a CursorAdapter attached to a ListView, the ListView contains checkboxes for every row. When I check/uncheck a checkbox in a row it will update it to a 0 or 1 in the database (This is working fine) I also have another checkbox in the same Activity that when pressed will disable all the checkboxes in the ListView [ setEnabled(false) ].
The problem is that when I press this checkbox the ListView checkboxes return to their initial state when I started the activity. It does not matter the number of checkboxes I changed during the activity.
However, if I press the back button and then re-enter the activity all modifications are saved because the Cursor is refreshed. I am calling notifyDataSetChanged() at the end of the the methods that disables all the checkboxes.
I also tried this for every checkbox in the ListView but it did not work (was unable to check a checkbox) Any ideas?
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Nov 19, 2010
I have a list view with 2 buttons on each row. I am using a cursoradpater to populate the list. I am also using the view holder pattern on newview() bindview().
My questions are: where do i put the clicklisteners for the buttons knowing that the action for the button is different from the action of the list item itself? Do i keep the onListItemClick ?
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Oct 31, 2009
I am building a custom listview used to list contacts from the contact cursor into a list with two text view for the phone number and name of the contact as well as a place for the images. I am getting a nullpoint error when i try to setText for my TextView Even though i checked the variable to see if they contained a string I have no ideas whats wrong with it. Code...
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Aug 16, 2010
I have a ListView backed by a custom adapter based on a CursorAdapter.The cursor I give it is based on a list of Notes in the database (each note is a DB row).Everything works just fine until I delete a note from the database. I'm not sure how to properly update the cursor/adapter/listview to display the new data.I've read conflicting posts on using adapter.notifyDataSetChanged() vs cursor.requery() to refresh the UI, but neither of them seems to work in this case.The only way I've been able to refresh it is by creating a new cursor from a new query and calling adapter.changeCursor(newCursor).Could someone demonstrate the proper way to update the backing data and then the UI (with psuedocode if possible).
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Feb 16, 2009
I'm facing to one problem with ListView. I would like to refresh the ListView every time I change the base data.
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Jun 1, 2010
I'm wondering if it is possible to rerender just one element in a listview? I assume by calling notifyDatasetChanged() is gonna rerender the whole list?
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Mar 16, 2010
I have a ListView in my android activity. And I populate the ListView by sub-class the BaseAdaptor (which returns a View in getView() method).
What if in my click listener of a button in a list item view, I change the text of the TextView in the List item view or change the dimension of the list item view by adding/removing children of the list item view
What is an efficient to refresh my listView? I don't want the listView to re-trigger a query since there is no data change.
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Mar 11, 2010
I have listview with items that include both text and images. If I scroll the listview fast enough all items images are messed up: wrong images are displayed for wrong items. The same problem exists with expandable listview. I tried to implement holder class to cache imageview and image itself using setTag, getTag but nothing helps. The faster I scroll the more items are messed up. Text almost always displayed correctly.
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Feb 12, 2010
I want to refresh an Android ListView after adding/deleting dynamic data.
Can any one tell me how to achieve this?
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Oct 26, 2009
In my ListView, I choose an Item to "Add Favorite" and I have to do some stuff work, I fill data again to refresh the List, then I implement OnScrollListener use setSelection(firstVisibleItem) to set List display right on Item was added. Are there any better way to do that. I mean like mCursor.requery() or something like that in android APIs ? Or any suggest way?
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May 3, 2010
After implementing some Android Apps, including several Map activities, I try to refresh the activity when the GPS listener's onLocationChanged() mehtod is called. I have no idea how to tell the map activity to refresh on its own and display the new coords. the coords to store will have to be in global values, so that the location listener will have access to it. In my sample GPS-class (see code below) I just changed the text of a text view....but how to do that in map view?
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Sep 24, 2010
Does the CursorAdapter run on a background thread and posts updates via the UI looper thread? If not what is the best pattern to load data asynchronously from a ContentProvider?
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Dec 2, 2009
I am writing my own ContentProvider for my own application. And there is a ListView with a CursorAdapter pulling data from my Content Provider. My question is when there is a data change in my ContentProvider, how can I notify my CursorAdatper to requery the data and then have the ListView updated?
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Aug 20, 2010
I'm watching this video http://www.youtube.com/watch?v=N6YdwzAvwOA and Romain Guy is showing how to make more efficient UI adapter code using the getView() method. Does this apply to CursorAdapters as well? I'm currently using bindView() and newView() for my custom cursor adapters. Should I be using getView instead?
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Oct 4, 2010
I was using some of the code from DeskClock and found that when I tried to modify the CursorAdapter that newView was getting called for each item. (I actually wanted to add a divider and it seems like adding the dividers separately is better than adding them into a single listView)
If I have 3 items I get the following behavior:
CODE:.............
I would've expected newView/bindView to be called once per cursor item. But, that doesn't seem to be the case. This was kind of a problem for me because I wanted to select the appropriate view depending on the cursor data, but since bindView could be called before newView that doesn't work.
Is this some odd recycler behavior (or somehow normal/expected)? Or is there something broken with the code (I removed everything except the ListView and it's still doing this)? I'm not quite sure why you would try to bind views that haven't been created, and why newView gets called on the first item twice.
If someone has an easy way of adding dividers to ListViews I'd love to know. I was going to try to dig through the contacts example to see how they did it there if not.
In case anyone's wondering MergeAdapter was neat to mess around with and try (I'll use it in some other situations). But, I did just end up writing a single adapter that handles multiple views. It computes the type of each item (which is small), stores it in a map, initializes it at adapter creation, and updates it in notifyDataSetChanged.
Then you just need to have getViewTypeCount() return the number of possible views. And getItemViewType to return the type from the map (which is 0 based, so 0-getViewTypeCount()). If you can compute your type from the position you don't need the map, but doing this on the fly wasn't possible so I just pre/recompute when needed.
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Nov 5, 2010
Does anyone tried to use CursorAdapter with old and new api?
Do you have some code examples of such solutions?
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Sep 7, 2010
I have a cursor adapter and the logcat is filled with above errors, as soon as I click on a view. I am already releasing the CursorAdapter's cursor in onDestroy().Is there any way to get information about when the cursor was opened?
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Jul 25, 2010
I have a listactivity as a startup screen in my application. Which is displaying database records using custom cursor adapter. On create I set the filterable flag - getListView().setTextFilterEnabled(true)
My cursoradapter overrides runQueryOnBackgroundThread which runs corresponding query. The problem is that after typing some text and hitting enter, runQueryOnBackgroundThread never gets called. However, when the item click in the same view launches another activity(detail view of the record) and I come back to the original list activity, hitting back button, then text filtering works just fine. I don't call setTextFilterEnabled anywhere except during the initialization process and I can't really find any other API affecting this behavior, so any guesses why text filtering doesn't work initially, but all of the sudden starts working when I come back to the list activity from child activity?
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Jul 1, 2010
I'm trying to clean up some code and now I'm determined to get this seemless ListView updating working...
I want my ListView to be updated when I call notifyDataSetChanged() but nothing happens... I'm also passing the autoRequery flag to true when creating my CursorAdapter.
Cursor c = FavoritesHandler.getCategoryFavorites(getSQLiteInstance(), category); m_favoriteAdapter.changeCursor(c); startManagingCursor(c);
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Jul 1, 2010
I have a ListActivity that uses a CursorAdapter to fill the rows in the view. I wrote a database helper class that gives me back results for common queries I make for my app, and it uses an SQLiteOpenHelper implementation I wrote to open the database. I use the open helper to open the database and get a cursor to pass to my CursorAdapter.
Here's a code snippet:
CODE:...................
The problem I'm having, that I didn't have before I implemented the open helper (before I just opened the database directly without a helper), is when I click on an item, which takes me to another activity, and then go back to this activity. When it initializes everything is fine, and my list is populated fine, but when I go back from the activity that follows, the list is empty and in the LogCat I see "Invalid statement in fillWindow()".
It appears from a few post I've seen that the reason is, when I requery the cursor, the database is closed. But I'm not closing it! I'm scratching my head on this one.
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Jul 26, 2010
My app wants to send a data file by email. However, the data only exists inside the database. There is no physical file containing it. In order to make it possible to send this using INTENT_SEND, I need to return a file descriptor in ContentProvider.openFile(). This means I need to write my data out to a temporary file on disk somewhere so I can open it to get a real file descriptor. However, the email app doesn't necessarily use the file immediately, and *doesn't tell me* when it's finished with it, so I don't know when to remove the temporary file. As the file is likely to be quite large I don't want to keep it around for long periods.
What I'd really like to do is to be able to avoid the whole issue by using a callback to synthesise the data as and when the email app needs it, using some sort of pipe. Unfortunately due to the real file descriptor requirement I can't use Java pipes, there are no Unix fifo APIs that I can find, and you can't create a ParcelFileDescriptor from a Unix socket, which was my other option. Is there any easy way to do what I want, or do I need to start messing around with TCP sockets?
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Jul 25, 2010
AVI file attached to gmail on Droid only offers PREVIEW as an option and my Rock Player app (which would play it) does not appear on list of apps to use. Movies and Video Player only come up and unlike Windows, there is no ability to browse for an app. (something that should be added to android). Is there a setting somewhere to fix up this goofiness? Been looking, but so far no luck.
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Jun 19, 2010
One of my 'must-haves' is the ability to open any kind of attachment that comes in with an email (.doc, .docx, .xls, .ppt, .jpeg, etc.) I was assured the Ally could with the application docs-to-go. I am now finding that it's a hit and miss with opening files. Files that have the .doc extension will come up and say 'can't open this video'.
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Feb 8, 2010
I am having some of the following exceptions:
CODE:................
I have googled it and see that it has something to do with popups and turning the screen, but there is no reference to my code.
The questions are:
Is there a way to find out exactly when this issue is happening? other than turning the screen, is there another event or action that triggers this error? how do I prevent this to happen?
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Feb 4, 2010
We are starting the e-mail intent of the user's choice (createChooser) and sending a zip file. This zip file is created right before the email sends, but we need to make sure the file is there until the email actually gets sent. Once the e-mail is sent, it would be nice to have this file deleted instead of sitting around eating SD card storage. Is this possible? (it can't be done in onActivityResult, e-mail intents don't actually finish, they cancel and thread the sending in a background service...so when onActivityResult gets called the e-mail might not have sent yet). Any ideas?
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Oct 10, 2010
I'm trying to get the name of the file attached to an email on the gmail app? Can anyone point in the direction of getting the file name ? I can get the attachemnt, just don't know how to get the original file name.
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Oct 22, 2010
I am trying to implement a dynamic auto complete widget in android.I am done with the major functionalities and the auto completion implemented is for youtube video search.When I start typing a letter or two, the auto-completion is not working. But when I type three letters or more it works prefect.It also works when I type two letters and hit a backspace.I do not know what is wrong with the code.
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Mar 30, 2010
I have a Nexus One connected to my computer via USB cable. Is it possible to have Nexus One route all TCP/IP traffic via my computer's internet connection? This is like reverse tethering I guess.
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Jun 29, 2009
I am trying to launch an email intent with an attached jpg. I did:
Intent intent4 = new Intent(Intent.ACTION_SENDTO,
Uri.fromParts("mailto", "testemail@gmail.com", null));
startActivity(intent4);
this launches the email activity.
But when I try to add DataAndType (my jpeg attachment). It fails with
android.content.ActivityNotFoundException: No Activity found to handle Intent { action=android.intent.action.SENDTO data=file:///data/data/com.mycompany.mypackage/files/temp-picture type=JPEG
Intent intent4 = new Intent(Intent.ACTION_SENDTO,
Uri.fromParts("mailto", "testemail@gmail.com", null));
intent4.setDataAndType(Uri.parse("file://"+ mTempFilePath),
Bitmap.CompressFormat.JPEG.name());
startActivity(intent4);
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Jun 4, 2009
how to create this screen which i have attached as a enclosed as a attachment. how to cod ethis can any body give the clues for that any source example regarding this.
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