Use of android ExpandableListView

ExpandableListView, as its name implies, is a scalable ListView. It can be used to implement menu settings and other functions. The project was used some time ago. Now I want to share with you the implementation method of ExpandableListView.

First:

After expansion:

The layout file is as follows:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:layout_width="fill_parent"android:layout_height="fill_parent"><ExpandableListView android:id="@+id/newsList"android:layout_width="fill_parent"android:layout_height="fill_parent"android:cacheColorHint="@color/transparent"android:drawSelectorOnTop="false"android:groupIndicator="@null"></ExpandableListView></LinearLayout>

The layout of the parent topic of ExpandableListView is as follows:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="32dip"android:background="@drawable/bg_group"android:padding="5dip"><TextView android:id="@+id/group_text"android:textSize="22dip"android:textColor="@color/white"android:layout_width="wrap_content"android:layout_height="wrap_content"/><ImageView android:id="@+id/group_image"android:layout_width="wrap_content"android:layout_height="wrap_content"android:paddingLeft="10dip"android:paddingTop="3dip"/></LinearLayout>

Subtopic layout:

<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="horizontal"android:layout_width="wrap_content"android:layout_height="wrap_content"android:background="@color/white"android:padding="5dip"><TextView android:id="@+id/child"android:layout_marginLeft="10dip"android:textSize="22dip"android:layout_width="fill_parent"android:layout_height="wrap_content"/></LinearLayout>

The main code is as follows:

Package com. cloay. news; import android. content. intent; import android. OS. bundle; import android. view. view; import android. widget. expandableListView; import android. widget. expandableListView. onChildClickListener; import com. cloay. news. bean. newsListAdapter; import com. cloay. news. service. mainService;/*** implement the topic list interface (implemented using ExpendListView) * @ author Cloay * 2012-3-3*09:38:12 */public class HomeActivity extends NewsReaderActivity {private ExpandableListView newsList; @ Overridepublic void onCreate (Bundle savedInstanceState) {super. onCreate (savedInstanceState); setContentView (R. layout. home); MainService. allActivity. add (this); newsList = (ExpandableListView) findViewById (R. id. newsList); NewsListAdapter adapter = new NewsListAdapter (HomeActivity. this); newsList. setAdapter (adapter); newsList. setOnChildClickListener (new OnChildClickListener () {// set listening for item. Note that isChildSelectable () return true must be in the adapter. For details, see the following code @ Overridepublic boolean onChildClick (ExpandableListView parent, View, int childPosition, long id) {// System. out. println ("groupPosition -->:" + groupPosition); // System. out. println ("childPosition -->:" + childPosition); Intent intent = new Intent (HomeActivity. this, ContentActivity. class); intent. putExtra ("groupPosition", groupPosition); intent. putExtra ("childPosition", childPosition); HomeActivity. this. startActivity (intent); return true ;}});}}

The Adapter that provides data for ExpandableListView:

Package com. cloay. news. bean; import java. util. arrayList; import java. util. list; import android. content. context; import android. view. layoutInflater; import android. view. view; import android. view. viewGroup; import android. widget. baseExpandableListAdapter; import android. widget. imageView; import android. widget. textView; import com. cloay. news. r; import com. cloay. news. constants. constants;/*** add ExpandableListView Data * @ author Cloay * 2012-3-4*08:10:29 */public class NewsListAdapter extends BaseExpandableListAdapter {@ SuppressWarnings ("rawtypes") private List <List> childList = new ArrayList <List> (); private LayoutInflater inflater; public NewsListAdapter (Context context) {super (); // initialize the data initData (context );} /*** provide data initialization for group and child * @ param context */private void initData (Context context) {// set the parent topic title Constants. Group. add (context. getResources (). getString (R. string. sina_news); Constants. group. add (context. getResources (). getString (R. string. sina_s); Constants. group. add (context. getResources (). getString (R. string. sina_t); Constants. group. add (context. getResources (). getString (R. string. sina_j); Constants. group. add (context. getResources (). getString (R. string. sina_e); Constants. group. add (context. getResources (). getStrin G (R. string. sina_f); // the title of each subtopic, Constants. child1.add (context. getResources (). getString (R. string. sina_china); Constants. child1.add (context. getResources (). getString (R. string. sina_world); Constants. child2.add (context. getResources (). getString (R. string. sina_s_all); Constants. child2.add (context. getResources (). getString (R. string. sina_s_football); Constants. child2.add (context. getResources (). getString (R. stri Ng. sina_s_nba); Constants. child3.add (context. getResources (). getString (R. string. sina_t); Constants. child3.add (context. getResources (). getString (R. string. sina_t_internet); Constants. child3.add (context. getResources (). getString (R. string. sina_t_mobile); Constants. child4.add (context. getResources (). getString (R. string. sina_j_all); Constants. child4.add (context. getResources (). getString (R. string. sina_j_china) ); Constants. child4.add (context. getResources (). getString (R. string. sina_j_world); Constants. child5.add (context. getResources (). getString (R. string. sina_e_all); Constants. child6.add (context. getResources (). getString (R. string. sina_f_w); Constants. child6.add (context. getResources (). getString (R. string. sina_f_m); childList. add (Constants. child1); childList. add (Constants. child2); childList. add (Constants. child3 ); ChildList. add (Constants. child4); childList. add (Constants. child5); childList. add (Constants. child6); inflater = LayoutInflater. from (context);} public NewsListAdapter (String [] group) {}@ Overridepublic int getGroupCount () {return Constants. group. size (); // parent column size} @ Overridepublic int getChildrenCount (int groupPosition) {return childList. get (groupPosition ). size (); // Number of subtopics} @ Overridepublic Object getGroup (int gr OupPosition) {return null ;}@ Overridepublic Object getChild (int groupPosition, int childPosition) {return null ;}@ Overridepublic long getGroupId (int groupPosition) {return 0 ;} @ Overridepublic long getChildId (int groupPosition, int childPosition) {return 0 ;}@ Overridepublic boolean hasStableIds () {return false ;}@ Overridepublic View getGroupView (int groupPosition, boolean isExpanded, view convertView, Vi EwGroup parent) {if (convertView = null) {convertView = inflater. inflate (R. layout. group, null);} ImageView image = (ImageView) convertView. findViewById (R. id. group_image); // you can specify the image icon for expansion. setImageResource (R. drawable. mm_submenu_down_normal); if (! IsExpanded) {image. setImageResource (R. drawable. mm_submenu_normal);} TextView textView = (TextView) convertView. findViewById (R. id. group_text); textView. setText (Constants. group. get (groupPosition); return convertView;} @ Overridepublic View getChildView (int groupPosition, int childPosition, boolean isLastChild, View convertView, ViewGroup parent) {if (convertView = null) {convertView = inflater. inflate (R. layout. child, null);} TextView textView = (TextView) convertView. findViewById (R. id. child); textView. setText (childList. get (groupPosition )). get (childPosition ). toString (); return convertView;} @ Overridepublic boolean isChildSelectable (int groupPosition, int childPosition) {return true; // return true to click child }}

Through the above code, we can achieve what we want. Please leave a message if you have any questions. Let's exchange and learn!

Note: Please indicate the source for reprinting!