android-cursorloader

问题 I have a fragment that contains a ViewPager . This ViewPager is backed by a PagerAdapter that uses a Cursor . The cursor is managed by LoaderCallbacks . I'm using the v4 support libraries here. What I want is to create the fragment and have the view pager showing a specified page, rather than starting at page 0. I know that ViewPager has a setCurrentItem() method, but the data may not yet be loaded when the ViewPager is created. What I need is to listen to the adapter for data set changes,

问题 I want to know how to use the CursorLoader to populate the widgets on a screen. All the examples online are only for using an adapter and this works great. What I need is a reliable way to update the views in my screen from a Cursor and on the UI thread and without sometimes crashing because of StaleDataException or the cursor being deactivated all of a sudden. Here is my current approach but I still receive some crash reports from users. @Override public Loader<Cursor> onCreateLoader(int id,

问题 I have created one Activity in that I am implementing CursorLoader for load data from Database. I have done that thing for all records of that Table but I want to load 30-30 records like Load More Functionality I have tried to create query and its loading first 30 records but I cant able to understand how can I request for new records. My Activity Code is Like: public class ProductListActivity extends AppCompatActivity implements LoaderManager.LoaderCallbacks<Cursor> { /** * Records in list *

问题 I have a ContentProvider , it's having two tables 1. OnlineContacts 2. AllContacts . Then i have a method in which i am querying both the tables and getting their resultant cursors separately. And then joining them using CursorJoiner and making a list of Contacts . Passing this list to my CustomAdapter extending BaseAdapter , i am populating my listview . Like : public static List<Contact> getContacts(Context context){ List<Contact> contactList = new ArrayList<Contact>(); // Getting First

问题 So I have my MainDisplayActivity which implements both Activity and LoaderManager.LoaderCallbacks<Cursor> . Here I have A ListView , which I fill with Agenda information that I get from my database using a ContentProvider. I also have a GridView which is a calendar. I have it set up when clicking a cell, that the agenda is updated with the day clicked. My problem is that when reusing the Loader I created in onCreate() inside of the setOnItemClickListener(), it does not refresh the information

问题 The google docs point out not to use the CursorAdapters first constructor, CursorAdapter(Context context, Cursor c) There are only two other options, CursorAdapter(Context context, Cursor c, boolean autoRequery) which says Constructor that allows control over auto-requery. It is recommended you not use this, but instead CursorAdapter(Context, Cursor, int). When using this constructor, FLAG_REGISTER_CONTENT_OBSERVER will always be set.` and CursorAdapter(Context context, Cursor c, int flags)`

问题 I use CursorLoader in my App, to do DB transactions. My app also has the method calling startManagingCursor(), which is deprecated. I just want to replace this method calling, so what am I supposed to do ? 回答1: startManagingCursor() is deprecated because it does operations on the main thread which can freeze up the UI and deliver a poor user experience. You should use a CusrorLoader with a LoaderManager instead. Check out this tutorial series from Alex Lockwood for detailed instructions:. 来源：

问题 I'm trying to implement a DataListFragment with an adapter that uses a Loader from Commonsware. This Loader uses a SQLiteDatabase directly and doesn't require the use of ContentProviders. The android reference states about Loaders: "While Loaders are active they should monitor the source of their data and deliver new results when the contents change." Under my SQLiteCursor implementation (below), this does not happen. OnLoadFinished() gets called once and that's it. Presumably, one could

问题 I have created a small application, trying to understand the functionality of the LoaderManager and CursorLoader -classes. I have implemented LoaderCallbacks<Cursor> on my FragmentActivity -class and everything works fine, except the fact that when I update my data via ContentResolver.update() or ContentResolver.insert() -methods, onLoadFinished() is not called and as a result my data doesn't update. I have a custom ContentProvider and I am wondering if the problem is in my ContentProvider

问题 I have created a small application, trying to understand the functionality of the LoaderManager and CursorLoader -classes. I have implemented LoaderCallbacks<Cursor> on my FragmentActivity -class and everything works fine, except the fact that when I update my data via ContentResolver.update() or ContentResolver.insert() -methods, onLoadFinished() is not called and as a result my data doesn't update. I have a custom ContentProvider and I am wondering if the problem is in my ContentProvider