android-loadermanager

问题 I have a DialogFragment that I'm working on to display two spinners, side by side, one displays a list of drivers, the other a list of vehicles. The data to populate these spinners is retrieved from a sqlite database. I am trying to use a LoaderManager to keep the spinners updated or in sync with the database tables, (drivers and vehicles). When I add/delete/edit a record in either the drivers table or vehicles table in the database, the spinners don't get updated, the driver or vehicle

问题 I am using the sample code from the Google tutorial. The projection is where I specify the data I want to collect. How do I specify that I want the phone numbers ? The sample from Google does not get phone number. But I want to obtain the phone number, so I add the field for Phone.NUMBER . But when I do, the app always crashes. Here is my projection. // The projection for the CursorLoader query. This is a list of columns that the Contacts // Provider should return in the Cursor. @SuppressLint

问题 I'm a new Android Developer and seem to have gotten in a little over my head. I am trying to make a listView update when I add more content to the list. The ListView is based off of a SQLite database. I was able to get the ListView to be based on the SQLite database by making a ContentProvider for the SQLite database (which was suggested here). Now my issue is that I want to update the SQLite database and have it reflected on the ListView. I am using a loader and according to this if I

问题 I am fairly new to android and I have some problems with a filtered listView and The activity it's in changing from landscape mode to portrait mode or or vice versa. I have an editText that I use for filtering "drinkSearch", this filtering works as long as I do not change the viewing angle (portrait vs landscape). This is the error that I get: java.lang.IllegalStateException: attempt to re-open an already-closed object: SQLiteQuery: SELECT _id, name FROM drinks As you can see in the following

问题 I'm trying to implement List->Detail scheme with details pagination. I've single Activity for ListView and different Activity with ViewPager. In FragmentStatePagerAdapter.getItem i instatniate new fragment for page and pass item id via setArguments Bundle. After opening pager Activity two Fragment pages are created and onCreate, onCreateView, onActivityCreated being called. BUT onLoadFinished is called only for first Fragment (currently visible). If i go back onLoadFinished is called for

问题 I have a series of ListView objects in Fragment s that are being populated by a CursorAdapter which gets a Cursor from the LoaderManager for the activity. As I understand it, all database and Cursor close actions are completely handled by the LoaderManager and the ContentProvider , so at no point in any of the code am I calling .close() on anything. Sometimes, however, I get this exception: 02-19 11:07:12.308 E/AndroidRuntime(18777): java.lang.IllegalStateException: attempt to re-open an

问题 My fragment implements the LoaderManager.LoaderCallBacks<Cursor> interface to load a list view from a content provider using a custom cursor adaptor. I use a SearchView widget to filter the data in the list view by restarting the loader as suggested by the doc http://developer.android.com/guide/components/loaders.html#restarting. I have two questions with this approach : When I use restartLoader() , only the onCreateLoader() and then onLoadFinished() are called. I do not see a call to

问题 I'm writing an app that allows people to set alarms for various tasks that they need to do. My current plan is to store all the relevant data into an SQLite database. To that end, I have created a class that extends SQLiteOpenHelper and filled it with methods to handle all the CRUD that I'd expect to have to take in. Knowing that it's generally a bad idea to do all the processing on one thread, I looked up ways to separate the work between threads and found CursorLoader and LoaderManager,

问题 I am trying to implement a CursorLoader and LoaderManager on a min API of 10. However, I keep getting an IllegalArgument Exception on Line 63 of AsyncTaskLoader.class (The source Code of the AsyncTaskLoader.class where the exception is happening is Below and at this link. /* Runs on the UI thread */ @Override protected void onPostExecute(D data) { if (DEBUG) Log.v(TAG, this + " onPostExecute"); try { AsyncTaskLoader.this.dispatchOnLoadComplete(this, data); } finally { done.countDown(); } }

问题 Android Compatibility package is said to support LoaderManager. How can I get an instance of LoaderManager? The getLoaderManager() method is missing in FragmentActivity, it's only in Fragment class. But I want to use only Loaders, not Fragments in my app. 回答1: Based on my reading of the source, call getSupportLoaderManager() on your ACL FragmentActivity . 来源： https://stackoverflow.com/questions/5763514/android-compatibility-package-and-getloadermanager