AlphabetIndexer con adaptador personalizado gestionado por LoaderManager
Estoy tratando de implementarAlphabetIndexer
con adaptador personalizado como este
AlphabetIndexer con adaptador personalizado
Mi clase ContactsCursorAdapter se extiendeSimpleCursorAdapter
e implementosSectionIndexer
y estoy usando unLoaderManager
para gestionar el cursor de mi adaptador, así que he anulado elswapCursor()
Método como la segunda respuesta al ejemplo anterior indica.
public class ContactsCursorAdapter extends SimpleCursorAdapter
implements SectionIndexer{
private LayoutInflater mInflater;
private Context mContext;
private AlphabetIndexer mAlphaIndexer;
public ContactsCursorAdapter(Context context, int layout, Cursor c,
String[] from, int[] to) {
super(context, layout, c, from, to);
mInflater = LayoutInflater.from(context);
mContext = context;
}
public View getView(final int position, View convertView, ViewGroup parent) {
...
}
@Override
public int getPositionForSection(int section) {
return mAlphaIndexer.getPositionForSection(section);
}
@Override
public int getSectionForPosition(int position) {
return mAlphaIndexer.getSectionForPosition(position);
}
@Override
public Object[] getSections() {
return mAlphaIndexer.getSections();
}
public Cursor swapCursor(Cursor c) {
// Create our indexer
if (c != null) {
mAlphaIndexer = new AlphabetIndexer(c, c.getColumnIndex(ContactsContract.Contacts.DISPLAY_NAME),
" ABCDEFGHIJKLMNOPQRSTUVWXYZ");
}
return super.swapCursor(c);
}
}
Sin embargo, esto falla si configuro mi vista de lista en fastScrollEnabled = true
getListView (). setFastScrollEnabled (true);
en mi clase ContactsCursorLoaderListFragment que se extiendeListFragment
e implementa LoaderManager.LoaderCallbacks.
Aquí está la traza de la pila:
04-25 01:37:23.280: E/AndroidRuntime(711): FATAL EXCEPTION: main
04-25 01:37:23.280: E/AndroidRuntime(711): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sendit/com.sendit.ContactManager}: java.lang.NullPointerException
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1956)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:1981)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread.access$600(ActivityThread.java:123)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1147)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.os.Handler.dispatchMessage(Handler.java:99)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.os.Looper.loop(Looper.java:137)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread.main(ActivityThread.java:4424)
04-25 01:37:23.280: E/AndroidRuntime(711): at java.lang.reflect.Method.invokeNative(Native Method)
04-25 01:37:23.280: E/AndroidRuntime(711): at java.lang.reflect.Method.invoke(Method.java:511)
04-25 01:37:23.280: E/AndroidRuntime(711): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
04-25 01:37:23.280: E/AndroidRuntime(711): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
04-25 01:37:23.280: E/AndroidRuntime(711): at dalvik.system.NativeStart.main(Native Method)
04-25 01:37:23.280: E/AndroidRuntime(711): Caused by: java.lang.NullPointerException
04-25 01:37:23.280: E/AndroidRuntime(711): at com.sendit.ContactsCursorAdapter.getSections(ContactsCursorAdapter.java:222)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.widget.FastScroller.getSectionsFromIndexer(FastScroller.java:507)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.widget.FastScroller.init(FastScroller.java:269)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.widget.FastScroller.<init>(FastScroller.java:155)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.widget.AbsListView.setFastScrollEnabled(AbsListView.java:1144)
04-25 01:37:23.280: E/AndroidRuntime(711): at com.sendit.LoaderCursor$ContactsCursorLoaderListFragment.onActivityCreated(LoaderCursor.java:107)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:847)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.FragmentManagerImpl.moveToState(FragmentManager.java:1032)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.BackStackRecord.run(BackStackRecord.java:622)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1382)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.Activity.performStart(Activity.java:4474)
04-25 01:37:23.280: E/AndroidRuntime(711): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:1929)
04-25 01:37:23.280: E/AndroidRuntime(711): ... 11 more
después de lasetFastScrollEnabled()
Método se llama se llama el adaptador personalizadogetSections()
Método que es donde se estrella.
public class LoaderCursor extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
FragmentManager fm = getFragmentManager();
// Create the list fragment and add it as our sole content.
if (fm.findFragmentById(android.R.id.content) == null) {
ContactsCursorLoaderListFragment list = new ContactsCursorLoaderListFragment();
fm.beginTransaction().add(android.R.id.content, list).commit();
}
}
public static class ContactsCursorLoaderListFragment extends ListFragment
implements LoaderManager.LoaderCallbacks<Cursor> {
ContactsCursorAdapter mAdapter;
Cursor mCursor;
String mCurFilter;
@Override
public void onActivityCreated(Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);
populateContactList();
// Prepare the loader. Either re-connect with an existing one,
// or start a new one.
getLoaderManager().initLoader(0, null, this);
ListView lv = getListView();
lv.setFastScrollEnabled(true);
//lv.setScrollingCacheEnabled(true);
lv.setDivider(getResources().getDrawable(R.drawable.list_divider));
}
// These are the Contacts rows that we will retrieve.
final String[] CONTACTS_SUMMARY_PROJECTION = new String[] {
ContactsContract.Contacts._ID,
ContactsContract.Contacts.DISPLAY_NAME,
ContactsContract.Contacts.PHOTO_ID, };
public Loader<Cursor> onCreateLoader(int id, Bundle args) {
// This is called when a new Loader needs to be created. This
// sample only has one Loader, so we don't care about the ID.
// First, pick the base URI to use depending on whether we are
// currently filtering.
Uri baseUri;
if (mCurFilter != null) {
baseUri = Uri.withAppendedPath(ContactsContract.Contacts.CONTENT_FILTER_URI,Uri.encode(mCurFilter));
} else {
baseUri = ContactsContract.Contacts.CONTENT_URI;
}
// Now create and return a CursorLoader that will take care of
// creating a Cursor for the data being displayed.
String selection = "((" + ContactsContract.Contacts.DISPLAY_NAME +
" NOTNULL) AND (" + ContactsContract.Contacts.HAS_PHONE_NUMBER + "=1)
AND (" + ContactsContract.Contacts.DISPLAY_NAME + " != '' ))";
String sortOrder = ContactsContract.Contacts.DISPLAY_NAME
+ " COLLATE LOCALIZED ASC";
return new CursorLoader(getActivity(), baseUri,
CONTACTS_SUMMARY_PROJECTION, selection, null, sortOrder);
}
public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
// Swap the new cursor in. (The framework will take care of closing the
// old cursor once we return.)
mAdapter.swapCursor(data);
}
public void onLoaderReset(Loader<Cursor> loader) {
// This is called when the last Cursor provided to onLoadFinished()
// above is about to be closed. We need to make sure we are no
// longer using it.
mAdapter.swapCursor(null);
}
/**
* Populate the contact list
*/
private void populateContactList() {
// start mappings
String[] from = new String[] { ContactsContract.Contacts.DISPLAY_NAME };
int[] to = new int[] { R.id.contactInfo };
// Create an empty adapter we will use to display the loaded data.
mAdapter = new ContactsCursorAdapter(getActivity().getApplicationContext(),
R.layout.contact_manager, null, from, to);
setListAdapter(mAdapter);
}
}
}
Y si os comento elsetFastScrollEnabled()
llamada, entonces no se produce un error, pero no veo elAlphabetIndexer
trabajando.
¿Es necesario implementar esto de forma diferente porque mi adaptador personalizado está configurado en unListFragment
y no unListActivity
?
¿Alguien tiene sugerencias sobre cómo hacer que todo esto funcione?