ListView Implementation Grouping

1:fragmenthack4.java

/*** Created by y on 15-1-2.*/ Public classFragmentHack4extendsfragment{View view; List<String>names;    ListView Lvnames;    Namesectionadapter adapter;    TextView Tvheader; intTopvisiblepos; @Override Public voidOnattach (activity activity) {Super. Onattach (activity); Names=NewArraylist<string>(); //test DataString []t={"A", "B", "C", "D", "E", "F"};  for(inti=0;i<t.length;i++){             for(intj=0;j<10;j++) {names.add (T[i]+ "00" +j); } }} @Override PublicView Oncreateview (layoutinflater inflater, ViewGroup container, Bundle savedinstancestate) {View= Inflater.inflate (R.layout.fragment_hack4, container,false); Tvheader=(TextView) View.findviewbyid (R.id.tvheader); Lvnames=(ListView) View.findviewbyid (r.id.lvnames); Adapter=NewNamesectionadapter (Getactivity (), r.layout.list_name_item,names);        Lvnames.setadapter (adapter); //set the first Group column dataSettopheader (0);        Lvnames.setonscrolllistener (Lvonscrolllistener ()); returnview; } Abslistview.onscrolllistener Lvonscrolllistener () {return NewAbslistview.onscrolllistener () {@Override Public voidOnscrollstatechanged (Abslistview Abslistview,inti) {} @Override Public voidOnscroll (Abslistview Abslistview,intIintI2,inti3) {                if(i!=Topvisiblepos) {Topvisiblepos=i;                Settopheader (i);    }            }        }; }    Private voidSettopheader (intPOS) {Tvheader.settext (Names.get (POS). SUBSTRING (0,1)); }}

2:namesectionadapter.java

/*** Created by y on 15-1-2.*/ Public classNamesectionadapterextendsArrayadapter<string>{    Private intresourceId;  PublicNamesectionadapter (Context context,intResourceId, list<string>objects) {        Super(context,resourceid,objects);  This. ResourceId =resourceId; } @Override PublicView GetView (intposition, View Convertview, ViewGroup parent) {String name=GetItem (position);        Viewholder Holder; if(convertview==NULL) {Convertview= Layoutinflater.from (GetContext ()). Inflate (ResourceId,NULL); Holder=NewViewholder (); Holder.tvheader=(TextView) Convertview.findviewbyid (R.id.tvheader); Holder.tvname=(TextView) Convertview.findviewbyid (r.id.tvname);        Convertview.settag (holder); }Else{Holder=(Viewholder) Convertview.gettag ();        } holder.tvName.setText (name); //if the first or first letter has changed, the group bar is displayed, otherwise hidden        if(Position==0 | | getItem (position-1). CharAt (0)!=name.charat (0) {holder.tvHeader.setVisibility (view.visible); Holder.tvHeader.setText (Name.substring (0,1)); }Else{holder.tvHeader.setVisibility (view.gone); }        returnConvertview; }    Static classviewholder{ PublicTextView Tvheader;  PublicTextView Tvname; }}

3: Layout file:

(1) Fragment_hack4.xml

<?XML version= "1.0" encoding= "Utf-8"?><Framelayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent">    <ListViewAndroid:id= "@+id/lvnames"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"/>    <includeLayout= "@layout/list_header"/></Framelayout>

(2) List_header.xml

<?XML version= "1.0" encoding= "Utf-8"?><TextViewxmlns:android= "Http://schemas.android.com/apk/res/android"Android:id= "@+id/tvheader"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:background= "#0000ff"Android:textcolor= "#ffffff"style= "@android: Style/textappearance.large"Android:textstyle= "Bold"/>

(3) List_name_item.xml

<?XML version= "1.0" encoding= "Utf-8"?><LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"android:orientation= "vertical">    <includeLayout= "@layout/list_header"/>    <TextViewAndroid:id= "@+id/tvname"style= "@android: Style/textappearance.small"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content" /></LinearLayout>

4: Run Results

ListView Implementation Grouping