android - Child View items are not refreshing -
here's code expandable listview in each grouo has checkbox , textview. there's select checkbox, on click should change states of child view's checkboxes not happening. can explain why??
mainactivity.java
public class mainactivity extends actionbaractivity implements onclicklistener { expandablelistadapter listadapter; expandablelistview explistview; list<string> listdataheader; static checkbox selectall; hashmap<string, list<string>> listdatachild; @override protected void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); // listview explistview = (expandablelistview) findviewbyid(r.id.expandablelistview1); selectall=(checkbox)findviewbyid(r.id.checkbox1); // preparing list data preparelistdata(); listadapter = new expandablelistadapter(this, listdataheader, listdatachild); // setting list adapter explistview.setadapter(listadapter); selectall.setonclicklistener(this); } /* * preparing list data */ private void preparelistdata() { listdataheader = new arraylist<string>(); listdatachild = new hashmap<string, list<string>>(); // adding child data listdataheader.add("top 250"); listdataheader.add("now showing"); listdataheader.add("coming soon.."); // adding child data list<string> top250 = new arraylist<string>(); top250.add("the shawshank redemption"); top250.add("the godfather"); list<string> nowshowing = new arraylist<string>(); nowshowing.add("the conjuring"); nowshowing.add("despicable me 2"); list<string> comingsoon = new arraylist<string>(); comingsoon.add("2 guns"); comingsoon.add("the smurfs 2"); listdatachild.put(listdataheader.get(0), top250); // header, child data listdatachild.put(listdataheader.get(1), nowshowing); listdatachild.put(listdataheader.get(2), comingsoon); } @override public void onclick(view arg0) { // todo auto-generated method stub checkbox cb=(checkbox)listadapter.getchildview(0, 0, false, null, null).findviewbyid(r.id.cb_child); cb.setchecked(true); ((baseexpandablelistadapter) listadapter).notifydatasetchanged(); } } expandablelistadapter.java
public class expandablelistadapter extends baseexpandablelistadapter { private context _context; private list<string> _listdataheader; // header titles private hashmap<string, list<string>> _listdatachild; public expandablelistadapter(context context, list<string> listdataheader, hashmap<string, list<string>> listchilddata) { this._context = context; this._listdataheader = listdataheader; this._listdatachild = listchilddata; } @override public object getchild(int groupposition, int childposititon) { return this._listdatachild.get(this._listdataheader.get(groupposition)) .get(childposititon); } @override public long getchildid(int groupposition, int childposition) { return childposition; } @override public view getchildview(final int groupposition, final int childposition, boolean islastchild, view convertview, viewgroup parent) { final string childtext = (string) getchild(groupposition, childposition); if (convertview == null) { layoutinflater infalinflater = (layoutinflater) this._context .getsystemservice(context.layout_inflater_service); convertview = infalinflater.inflate(r.layout.child_layout, null); } return convertview; } @override public int getchildrencount(int groupposition) { return this._listdatachild.get(this._listdataheader.get(groupposition)) .size(); } @override public object getgroup(int groupposition) { return this._listdataheader.get(groupposition); } @override public int getgroupcount() { return this._listdataheader.size(); } @override public long getgroupid(int groupposition) { return groupposition; } @override public view getgroupview(int groupposition, boolean isexpanded, view convertview, viewgroup parent) { string headertitle = (string) getgroup(groupposition); if (convertview == null) { layoutinflater infalinflater = (layoutinflater) this._context .getsystemservice(context.layout_inflater_service); convertview = infalinflater.inflate(r.layout.group_layout, null); } textview lbllistheader = (textview) convertview .findviewbyid(r.id.textview1); lbllistheader.settypeface(null, typeface.bold); lbllistheader.settext(headertitle); return convertview; } } activity_main.xml
<relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:id="@+id/container" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.example.expandablelisttest.mainactivity" tools:ignore="mergerootframe" > <expandablelistview android:layout_margintop="100dp" android:id="@+id/expandablelistview1" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_alignparentleft="true" > </expandablelistview> <checkbox android:id="@+id/checkbox1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_margintop="21dp" android:text="select all" /> </relativelayout> child_layout.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <checkbox android:id="@+id/cb_child" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_margintop="18dp" android:text="checkbox" android:checked="false"/> </relativelayout> group_layout.xml
<?xml version="1.0" encoding="utf-8"?> <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <textview android:id="@+id/textview1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignparentleft="true" android:layout_alignparenttop="true" android:layout_marginleft="18dp" android:layout_margintop="14dp" android:text="textview" /> </relativelayout>
method getchildview(..) used adapter populate expandable child view under group. i can encourage create own expandablelistadapter extends baseexpandablelistadapter (if have 1 group = 1 item, can use 1 arraylist own pojo object model) and finnaly, full explanation, when call notifydatasetchanged(), list refresh view adapter's data (example each boolean , use there value check or uncheck checkbox)
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