Android ExpandableListView and androidlistview

Android ExpandableListView and androidlistview

Click Show show to show the effect first:

Start, 1. First create an XML display main interface:

Main_activity.xml:

<LinearLayout xmlns: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"  ><ExpandableListView        android:id ="@+id/expandableListView"          android:layout_width ="match_parent"          android:layout_height ="wrap_content"       /></LinearLayout>

2. Enter main_activity to start display:

// Define two lists to control the String in Group and Child; private List <String> groupArray; // private List of Group lists <List <String> childArray; // sublist private ExpandableListView expandableListView_one;

Initialize data:

// Initialize the data private void initdate () {addInfo ("language", new String [] {"Oracle", "Java", "Linux", "Jquery "}); addInfo ("men's needs", new String [] {"money", "career", "power", "Women", "House", "car ", "ball"});} // Add data to the list to private void addInfo (String group, String [] child) {groupArray. add (group); // add it to the external rent List <String> childItem = new ArrayList <String> (); for (int index = 0; index <child. length; index ++) {childItem. add (child [index]);} childArray. add (childItem );}

After initialization, you can perform adapter adaptation:

 expandableListView_one.setAdapter(new ExpandableListViewaAdapter(MainActivity.this));

 class ExpandableListViewaAdapter extends BaseExpandableListAdapter {        Activity activity;         public  ExpandableListViewaAdapter(Activity a)              {                  activity = a;              }         /*-----------------Child */        @Override        public Object getChild(int groupPosition, int childPosition) {            // TODO Auto-generated method stub            return childArray.get(groupPosition).get(childPosition);        }         @Override        public long getChildId(int groupPosition, int childPosition) {            // TODO Auto-generated method stub            return childPosition;        }         @Override        public View getChildView(int groupPosition, int childPosition,                boolean isLastChild, View convertView, ViewGroup parent) {                         String string =childArray.get(groupPosition).get(childPosition);                         return getGenericView(string);        }         @Override        public int getChildrenCount(int groupPosition) {            // TODO Auto-generated method stub            return childArray.get(groupPosition).size();        }       /* ----------------------------Group */        @Override        public Object getGroup(int groupPosition) {            // TODO Auto-generated method stub            return getGroup(groupPosition);        }         @Override        public int getGroupCount() {            // TODO Auto-generated method stub            return groupArray.size();        }         @Override        public long getGroupId(int groupPosition) {            // TODO Auto-generated method stub            return groupPosition;        }         @Override        public View getGroupView(int groupPosition, boolean isExpanded,                View convertView, ViewGroup parent) {                        String   string=groupArray.get(groupPosition);           return getGenericView(string);        }         @Override        public boolean hasStableIds() {            // TODO Auto-generated method stub            return false;        }         @Override        public boolean isChildSelectable(int groupPosition, int childPosition)         {            // TODO Auto-generated method stub            return true;        }                 private TextView  getGenericView(String string )         {              AbsListView.LayoutParams  layoutParams =new AbsListView.LayoutParams(                    ViewGroup.LayoutParams.MATCH_PARENT,                    ViewGroup.LayoutParams.WRAP_CONTENT);                             TextView  textView =new TextView(activity);              textView.setLayoutParams(layoutParams);                             textView.setGravity(Gravity.CENTER_VERTICAL |Gravity.LEFT);                             textView.setPadding(40, 0, 0, 0);              textView.setText(string);              return textView;         }    }