java - Expandable ListView change childdata on buttonClick -

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okay, english not best, give try :)

i have 3 buttons, each 1 implements onclicklistener. have expandablelistview, filled data. if 1 button clicked, call method changes child data , show new data changed method. problem data remains same , there no changes. tried call method notifydatasetchanged in onclick method not work.

    [...]      explistview.setadapter(listadapter);     dienstag.setonclicklistener(new button.onclicklistener() {         @override         public void onclick(view v) {             arraydienstaginitialsierung();             listadapter.notifydatasetchanged();         }     }); } expandablelistadapter listadapter; listadapter = new expandablelistadapter(this, listdataheader, listdatachild);       // setting list adapter     explistview.setadapter(listadapter);  private void arraydienstaginitialsierung() {     system.out.println("hallo bin im dienstag drinnen");     //früchstück     (int f = 0;f < zwischentabelleliste.size();f++)     {         if(zwischentabelleliste.get(f).getmahlzeit().equals("fruechstueck")            && zwischentabelleliste.get(f).gettag() == 2) //kommt noch dazu welcher ernährungsplan geplant ist         {  produktelistefruechstueckstring.add(produkteliste.get(fr).tostring());           }     }


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