Android Fragment Inheritance -


edit: in fixing problems pointed out @editpandaforce, stumbled upon problem. basefragment lines in logcat not fragment, ones leading one. oncreateview not called in fragment yet.

i having 2 problems android app i'm writing.

first, have fragmentfoo inheriting abstract basefragment. oncreateview() executes basefragment code. fragmentfoo.oncreateview() not execute @ all.

second, databasehandler db returning null in function fragmentfoo.loadstuff(), not null in basefragment.oncreateview(). oncreateview() called before loadstuff() is.

i'm guessing 2 related , i'm missing critical in inheritance relationship.

here code:

fragmentfoo:

public class fragmentfoo extends basefragment {     private long flserial;      @override     protected void setupfragment() {         stitle = "view foo";         idlayout = r.layout.fragment_foo;     }      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         log.d("fragmentfoo", "oncreateview before");         view view = super.oncreateview(inflater, container, savedinstancestate);         log.d("fragmentfoo", "oncreateview after");          try{             flsessionserial = this.getarguments().getlong("serial");         } catch (exception e) {             flsessionserial = -1;         }             return view;     }      @override     public void onattach(context context) {         super.onattach(context);         log.d("fragmentfoo", "onattach");         loadstuff();     }      private void loadstuff() {         log.d("fragmentfoo", "loadstuff - db=null:" + string.valueof(db == null));         cursor cursor = db.getcursor(flserial);         log.d("fragmentfoo", "cursorloadloads - cursor=null: " + string.valueof(cursor == null));          string[] columns = new string[] {"foo", "bar"};         int[] ids = new int[] {r.id.textview_foo, r.id.textview_bar};         simplecursoradapter adapter = new simplecursoradapter(getactivity(), r.layout.adapter_foo, cursor, columns, ids, 0);          listview lv = (listview) getactivity().findviewbyid(r.id.listview_foo);         lv.setadapter(adapter);         lv.setonitemclicklistener(this);     } }

basefragment:

public abstract class basefragment extends fragment {     protected string stitle;     protected databasehandler db;     protected int idlayout;      protected abstract void setupfragment();      @override     public view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate) {         setupfragment();         db = databasehandler.getinstance(getactivity());         log.d("basefragment", "oncreateview - db=null: " + string.valueof(db == null));         return inflater.inflate(idlayout, container, false);     } }

databasehandler:

public class databasehandler extends sqliteopenhelper {     private static databasehandler sinstance;     private static context scontext;      public static synchronized databasehandler getinstance(context context) {         if (sinstance == null) {             scontext = context;             sinstance = new databasehandler(context.getapplicationcontext());         }         return sinstance;     }      private databasehandler(context context) {         super(context, database_name, null, database_version);     }      public cursor getcursor(){         sqlitedatabase db = getreadabledatabase();         string qry = "select * table";         cursor cursor = db.rawquery(qry, null);         if (cursor != null)             cursor.movetofirst();         return cursor;     }  }

the relevant logcat entries follows:

d/basefragment: oncreateview - db=null: false d/basefragment: oncreateview - db=null: false d/fragmentfoo: onattach d/fragmentfoo: loadstuff - db=null:true


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