Android ListView two level catalog Check effect

A. ListView's Level Two directory and check the implementation:

recorded so that it may be used in the future, directly affixed to the source code :

First on:

Main interface:

public class Mainactivity extends Activity {//Tree ListView Display category private Expandablelistview listview1;//level private list< String> groups;//Level Two private list<list<string>> child;//adapter private Listviewadapter madapter;// Record the clicked node position, initially -1public static int children_item = -1;public static int parent_item = -1;//record the last clicked Itemprivate View view; @Ov errideprotected void OnCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate); Setcontentview ( R.layout.activity_main); listview1 = (Expandablelistview) Findviewbyid (r.id.listview1); madapter = new Listviewadapter    (This, listviewadapter.paddingleft >> 1); groups = Getlistdata (); First-level directory child = new arraylist<list<string>> ();        list<listviewadapter.treenode> TreeNode = Madapter.gettreenode (); Add content for each level of directory for (int i = 0; i < groups.size (); i++) {listviewadapter.treenode node = new Listviewadapter.treenode (); Node.parent = Groups.get (i), Child.add (I,getlistdata ()), for (int II = 0; II < child.get (i). sIze (); ii++) {Node.childs.add (Child.get (i). Get (ii));} Treenode.add (node);} Madapter.updatetreenode (TreeNode); Listview1.setadapter (Madapter); Listview1.setonchildclicklistener (new Onchildclicklistener () {@Overridepublic Boolean onchildclick (Expandablelistview arg0,view arg1, int parent, int Children, long Arg4) {//Current item discoloration Arg1.setbackgroundresource (R.COLOR.COLOR1);//The previous item restores if (Parent_item! =- 1&& Children_item! = -1&& (Children_item! = Children | | Parent_item! = parent)) {View.setbackgroundresour CE (R.DRAWABLE.LISTVIEW_ITEM_BG);}    View = Arg1;children_item = Children;parent_item = Parent;return false;}}); Public list<string> getlistdata () {list<string> List = new arraylist<string> (); List.add ("language"); List.add ("mathematics"), List.add ("English"), List.add ("History"), List.add ("Mao"); List.add ("nature"); return list;}}

Adapter:

public class Listviewadapter extends Baseexpandablelistadapter {public static final int itemheight = 72;//height of each item STA    Tic Final int paddingleft = 48;//height of each item private int mypaddingleft = 0; Static public class TreeNode {public String parent;public list<string> childs = new arraylist<string> ();} list<treenode> treenodes = new arraylist<treenode> (); Context Parentcontext;public Listviewadapter (context view, int mypaddingleft) {Parentcontext = View;this.mypaddingleft = Mypaddingleft;} Public list<treenode> Gettreenode () {return treenodes;} public void Updatetreenode (list<treenode> nodes) {treenodes = nodes;} public void RemoveAll () {treenodes.clear ();} Public Object getchild (int groupposition, int childposition) {return treenodes.get (groupposition). Childs.get ( childposition). toString ();} public int Getchildrencount (int groupposition) {return treenodes.get (groupposition). Childs.size ();} static public TextView Gettextview (context context) {ABSLISTVIEW.LAYOUTPArams LP = new Abslistview.layoutparams (ViewGroup.LayoutParams.FILL_PARENT, itemheight); TextView TextView = new TextView (context); Textview.setlayoutparams (LP); Textview.setgravity (gravity.center_vertical | Gravity.left); Textview.settextsize (); return textView;} Public View getchildview (int groupposition, int childposition,boolean islastchild, View Convertview, ViewGroup parent) {T Extview TextView = Gettextview (This.parentcontext); Textview.settext (Getchild (Groupposition, childposition). ToString ()); Textview.setpadding (Mypaddingleft + paddingleft, 0, 0, 0); Textview.settextsize (); return textView;} Public View getgroupview (int groupposition, Boolean Isexpanded,view Convertview, ViewGroup parent) {//will not be checked for missing if ( Mainactivity.children_item! =-1) {if (Mainactivity.children_item = = groupposition) { Convertview.setbackgroundresource (R.color.color1);} else {convertview.setbackgroundresource (R.DRAWABLE.LISTVIEW_ITEM_BG);}} TextView TextView = Gettextview (This.parentcontext); Textview.settext (Getgroup (groupposition). toString ()); Textview.setpadding (Mypaddingleft + (paddingleft >> 1), 0, 0, 0); return textView;} public long Getchildid (int groupposition, int childposition) {return childposition;} Public Object getgroup (int groupposition) {return treenodes.get (groupposition). parent.tostring (); public int GetGroupCount () {return treenodes.size ();} public long getgroupid (int groupposition) {return groupposition;} public boolean ischildselectable (int groupposition, int childposition) {return true;} public Boolean hasstableids () {return true;}}

Xml:

<linearlayout xmlns:android= "http://schemas.android.com/apk/res/android"    xmlns:tools= "http// Schemas.android.com/tools "    android:layout_width=" fill_parent "    android:layout_height=" Fill_parent    " Android:background= "@android: Color/background_light"    android:orientation= "vertical" >   < Expandablelistview            android:id= "@+id/listview1"            android:layout_width= "fill_parent"            android:layout_ height= "Fill_parent"            android:choicemode= "Singlechoice"/></linearlayout>

Drawable/listview_item_bg.xml:

<?xml version= "1.0" encoding= "Utf-8"? ><selector xmlns:android= "http://schemas.android.com/apk/res/ Android ">    <item android:drawable=" @android: Color/background_dark "android:state_selected=" true "> </item>    <item android:drawable= "@android: Color/background_dark" android:state_pressed= "true" > </item>   <item android:drawable= "@android: Color/background_dark" android:state_focused= "true" > </item>    <item android:drawable= "@android: Color/transparent" ></item></selector>

Color.xml:

<?xml version= "1.0" encoding= "Utf-8"?><resources>    <color name= "Color1" > @android: color/ Background_dark</color></resources>

Android ListView two level catalog Check effect