android-cursorloader

问题 I'm setting up my app so that people can create groups of their friends. When a group is created, it writes 2 tables to the SQL database. The first table has a group name and a group id. The second table has 2 columns, a group id and a user id. This is working fine. However, now I want to be able to read from the database. I'm using a listview fragment with a cursorloader but I'm having trouble getting the information to display. I want to list all the group names from the first table in my

问题 I've got two loaders, each of which loads data from a different content provider. The fragment is supplied with the ID of a medication from the first content provider, and the first loader loads all of the information related to that medication. The second loader is supposed to query the second content provider for all of the alarms associated with that medication. The first loader works just fine, and returns all of the correct data. However, the second loader appears to return a null cursor

问题 I have a method that queries a database table via a provider and returns a CursorLoader to be used to populate a UI via a CursorAdapter . I need in one particular case only to add some extra data that are not part of the database result set. Is there a way to somehow for that case add some extra "fake" rows with the data? Like creating a cursor loader from two data sources? 回答1: Yes. Use MatrixCursor to add some "fake" rows. Then merge the two cursors (CursorAdapter, MatrixCursor) using the

问题 Assume we have an Activity with n TextView s that represent one line notes. These notes are stored somewhere (local database, network etc), and each time onResume() being called, the proper number of TextView s are drawn according to that stored data. Now, lets say the user want to delete a note, what would be the best way the resolve the specific TextView , back to its storage entity? At the moment, the only way I know is by using View.Tag , and having some manager to translate it to data

问题 I am using an Activity that extends SherlockFragmentActivity , that has 3 tabs. The 3 tabs are ListFragments that implement LoaderManager.LoaderCallbacks . The OnCreate method for the Activity loads the tabs like so bar.addTab(bar.newTab() .setTag("venues_list") .setText(getString(R.string.list_venues_header)) .setTabListener(new TabListener<VenueListFragment>( this, getString(R.string.list_invites_header), VenueListFragment.class, null))); // I do the EXACT same thing for the other two tabs,

问题 I am using an Activity that extends SherlockFragmentActivity , that has 3 tabs. The 3 tabs are ListFragments that implement LoaderManager.LoaderCallbacks . The OnCreate method for the Activity loads the tabs like so bar.addTab(bar.newTab() .setTag("venues_list") .setText(getString(R.string.list_venues_header)) .setTabListener(new TabListener<VenueListFragment>( this, getString(R.string.list_invites_header), VenueListFragment.class, null))); // I do the EXACT same thing for the other two tabs,

问题 As the title says, when trying to paginate a ListView backed by a SimpleCursorAdapter and a CursorLoader , old cursors are getting closed, thus the below exception is being thrown. The first 2 pages load just fine (the first isn't using the MergeCursor and the second page is the first one to use the MergeCursor ). I don't call any close() on any cursor whatsoever. What is interesting is that while debugging, I cannot see the closed flags on any cursor being set as true, for what it's worth.

问题 The app has data in a SQLite database. The UI is primarily a RecyclerView. The question is how to best to transfer data from the database into the UI, whilst keeping off the main thread? I originally planned to use a CursorLoader, ContentProvider, and RecyclerView. But reading around it looks like RecyclerView has no out-of-the-box support for Cursor-supplied data. Dang. That then leaves me with a few other options... AsyncTask to load the data, put it into model objects, and pass into the

问题 In our Project we deal a lot with Lists and used it in the past with the following "pattern": ListView is in a Fragment, gets initialized in onActivityCreated where we first start CursorLoaders and then in onFinish swapCusor to the ListAdapter. We then implemented a search functionality using the filterQueryProvider which just returns a cursor with contentResolver.query(...). If i have done some orientation changes while something in the list was selected i got the following error in many

问题 I am fetching Genre list from media content Provider of android using CursorLoder class. below is my cursor query to fetch the list of Genre. public Loader<Cursor> onCreateLoader(int id, Bundle args) { // currently filtering. Uri baseUri; baseUri = MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI; String[] STAR = { "*" }; return new CursorLoader(getActivity(), baseUri, STAR, null, null, null ); } Now, i got all the genre list from the media content provider but the problem with the data i got. I