Best Way to Refresh Adapter ListView on Android

Question

My book   Hello Android  gives this as a way of using a custom db helper  setting up a cursor  and then setting up an adapter as follows   Cursor cursor CustomDatabaseHelper test   new CustomDatabaseHelper this   try           cursor   getData            showData cursor     finally           test close        With this however  everytime I need to refresh the data set  I need to keep running this block of code  which gets a bit difficult inside an onClick   for a button due to  this  not being available   Is this the best way to refresh the data set  or should I look towards removing the  close and issue an adapter notifyDataSetChanged    If I do this  sometimes I get a force close as  and I can t remember at the moment  but sometimes it cannot Delete properly - I think this may be because the database is currently open and it tries to open again   Should we also be declaring the variables for the Cursors  DatabaseHelpers and Adapter in the Class  outside of the OnCreate  so that they are accessible to all the functions   I realise this is just poor programming at this stage  but Im trying to get some pointers as to the best way of doing things

User · Answer

Best Way to Refresh Adapter ListView on Android   Not only calling notifyDataSetChanged   will refresh the ListView data  setAdapter   must be called before to load the information correctly     listView setAdapter adapter     adapter notifyDataSetChanged

User · Answer

If nothing works  just create the adapter instance again with the new set of results or the updated set of results  Then you can see the new view   XYZAdapter adbXzy   new XYZAdapter context  0  listData   xyzListView setAdapter adbXzy    adbXzy notifyDataSetChanged

User · Answer

just write in your Custom ArrayAdaper this code   public void swapItems ArrayList lt Item gt  arrayList        this clear        this addAll arrayList

User · Answer

Perhaps their problem is the moment when the search is made in the database  In his Fragment Override cycles of its Fragment java to figure out just  try testing with the methods    Override public View onCreateView LayoutInflater inflater  ViewGroup container Bundle savedInstanceState        View rootView   inflater inflate R layout fragment x  container  false     Your query and ListView code probably will be here     Log i  FragmentX    Step OnCreateView      Try with it     return rootView       Try it similarly put Log i      onStart  and  onResume    Finally cut the code in  onCreate  e put it in  onStart  for example    Override public void onStart        super onStart        Log i  FragmentX   Step OnStart        dbManager   new DBManager getContext         Cursor cursor   dbManager getAllNames        listView    ListView getView   findViewById R id lvNames       adapter   new CustomCursorAdapter getContext   cursor 0     your adapter     adapter notifyDataSetChanged        listView setAdapter adapter

User · Answer

You should use adapter notifyDataSetChanged    What does the logs says when you use that

User · Answer

If you are using LoaderManager try with this statement   getLoaderManager   restartLoader 0  null  this

User · Answer

adapter notifyDataSetChanged

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Just write in your Custom ArrayAdaper this code   private List lt Cart items gt  customListviewList    refreshEvents carts    public void refreshEvents List lt Cart items gt  events        this customListviewList clear        this customListviewList addAll events       notifyDataSetChanged

User · Answer

Following code works perfect for me  EfficientAdapter adp    EfficientAdapter  QuickList getAdapter    adp UpdateDataList EfficientAdapter MY DATA   adp notifyDataSetChanged    QuickList invalidateViews    QuickList scrollBy 0  0

User · Answer

Simply add these code before setting Adapter it s working for me       listView destroyDrawingCache        listView setVisibility ListView INVISIBLE       listView setVisibility ListView VISIBLE     Or Directly you can use below method after change Data resource      adapter notifyDataSetChanged

[android] Best Way to Refresh Adapter/ListView on Android

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