List of Android Expandablelistview list

Sometimes, we need to design such an interface, there is a list outside, when we click on one of the items in the list, we will expand the entry, a new list appears. For example: (program running, posted here)

When we click on the first item, the view changes to:

--------------------------------------------------------------------------------------------------------------- ---------------

To achieve this, you need to define three layouts, including the displayed main_activity (main layout), group (first-level list layout), child (second-level list layout), the following code, and explanations in the comments:

Main_activity:

<LinearLayoutxmlns:android= "Http://schemas.android.com/apk/res/android"Xmlns:tools= "Http://schemas.android.com/tools"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"android:orientation= "vertical"Android:paddingbottom= "@dimen/activity_vertical_margin"Android:paddingleft= "@dimen/activity_horizontal_margin"Android:paddingright= "@dimen/activity_horizontal_margin"Android:paddingtop= "@dimen/activity_vertical_margin"Tools:context= "Com.example.expandlistaacitvity.MainActivity" >    <!--Android documents require Expandablelistview ID must be list, otherwise it will throw an error, interested can try #ff0000 for Red Drawselectorontop=false is set when you choose You can clearly display the current item (I tried it as if nothing had changed ...). ) -    <ExpandablelistviewAndroid:id= "@android: Id/list"Android:layout_width= "Match_parent"Android:layout_height= "Wrap_content"Android:layout_weight= "1"Android:drawselectorontop= "false"/>        <!--This textview is displayed when there is no data to display. This ID also stipulates that must use empty, no person in front of the words will not function -    <TextViewAndroid:id= "@android: Id/empty"Android:layout_width= "Match_parent"Android:layout_height= "Match_parent"Android:background= "#ff0000"Android:text= "No data" /></LinearLayout>

Group.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= "Match_parent"android:orientation= "vertical" >        <!--This is the layout of the first-level list defined #0000ff是深青色 -    <TextViewAndroid:id= "@+id/groupto"Android:layout_height= "Match_parent"Android:layout_width= "Match_parent"Android:background= "#0000ff"Android:paddingtop= "20DP"Android:paddingleft= "60DP"Android:paddingbottom= "10DP"android:textsize= "26SP"Android:text= "No data"/></LinearLayout>

Child.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= "Match_parent"Android:layout_margin= "5DP"android:orientation= "vertical" >        <!--The second-level list in the list is defined here, and no data is displayed -    <TextViewAndroid:id= "@+id/childto"Android:layout_height= "Match_parent"Android:layout_width= "Match_parent"Android:paddingtop= "20DP"Android:paddingleft= "50DP"Android:paddingbottom= "10DP"Android:background= "#00ff00"Android:text= "No data"/></LinearLayout>

The following is the main activity, which is also explained in the code:

 Packagecom.example.expandlistaacitvity;Importjava.util.ArrayList;ImportJava.util.HashMap;Importjava.util.List;ImportJava.util.Map;Importandroid.app.ExpandableListActivity;ImportAndroid.os.Bundle;ImportAndroid.widget.SimpleExpandableListAdapter; Public classMainactivityextendsexpandablelistactivity {@Overrideprotected voidonCreate (Bundle savedinstancestate) {Super. OnCreate (savedinstancestate);                Setcontentview (R.layout.activity_main); //define two first-level entrieslist<map<string, string>> groups =NewArraylist<map<string,string>>(); Map<string, string> group1 =NewHashmap<string, string>(); Group1.put ("Group", "Group1 first level list One");        Groups.add (group1); Map<String,String> group2 =NewHashmap<string, string>(); Group2.put ("Group", "Group2 First Level list");                Groups.add (group2); //Define a list that contains level two entries in the first level entrylist<map<string, string>> child1 =NewArraylist<map<string,string>>(); Map<string, string> child1date1 =NewHashmap<string, string>(); Child1date1.put ("Child", "Clild1date1 Second Level list");        Child1.add (CHILD1DATE1); Map<string, string> child1date2 =NewHashmap<string, string>(); Child1date2.put ("Child", "Child1date2 Second Level list");                Child1.add (CHILD1DATE2); //defines a list, which is a level two entry for the second first level entrylist<map<string, string>> child2 =NewArraylist<map<string,string>>(); Map<string, string> child2date1 =NewHashmap<string, string>(); Child2date1.put ("Child", "Child222date1 Second Level list");                Child2.add (CHILD2DATE1); //put two two-level entries into the listlist<list<map<string, string>>> childs =NewArraylist<list<map<string,string>>>();        Childs.add (child1);                Childs.add (CHILD2); /** 1. Context * 2. The data for the first level list, including the individual group * 3. Specifies the layout of a list of levels * 4. Specifies the key of the first-level list * 5. Specifies the ID of the control displayed for a level entry * Following ibid .*/Simpleexpandablelistadapter Simpleexpandablelistadapter=NewSimpleexpandablelistadapter ( This, groups, R.layout.group,Newstring[]{"Group"},New int[]{r.id.groupto}, Childs,r.layout.child,Newstring[]{"Child"},New int[]{r.id.childto}];    Setlistadapter (Simpleexpandablelistadapter); }}

List of Android Expandablelistview list