How to get Group and Child positions from Multilevel ExpandableListview

Question

Hi I have requirement to show items in multilevel expandable listview and for this i searched in google and found below code it's working fine

But how can i find each level Group and Child positions can some one help me please..

Activity:-

public class SampleActivity extends ActivityBase {

    ExpandableListView explvlist;

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setUpBaseLayout(R.layout.activity_expandable);
        explvlist = (ExpandableListView) findViewById(R.id.ParentLevel);
        explvlist.setAdapter(new ParentLevel());
    }

    public class ParentLevel extends BaseExpandableListAdapter {

        @Override
        public Object getChild(int arg0, int arg1) {
            return arg1;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public View getChildView(int groupPosition, int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent) {
            CustExpListview SecondLevelexplv = new CustExpListview(SampleActivity.this);
            SecondLevelexplv.setAdapter(new SecondLevelAdapter());
            SecondLevelexplv.setGroupIndicator(null);

            return SecondLevelexplv;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return 3;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return groupPosition;
        }

        @Override
        public int getGroupCount() {
            return 5;
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        @Override
        public View getGroupView(final int groupPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent) {
            TextView tv = new TextView(SampleActivity.this);
            tv.setText("->FirstLevel");
            tv.setTextColor(Color.BLACK);
            tv.setTextSize(20);
            tv.setBackgroundColor(Color.BLUE);
            tv.setPadding(10, 7, 7, 7);

            return tv;
        }

        @Override
        public boolean hasStableIds() {
            return true;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            return true;
        }
    }

    public class CustExpListview extends ExpandableListView {

        int intGroupPosition, intChildPosition, intGroupid;

        public CustExpListview(Context context) {
            super(context);
        }

        protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(960,
                    MeasureSpec.AT_MOST);
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(600,
                    MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }


    public class SecondLevelAdapter extends BaseExpandableListAdapter {

        @Override
        public Object getChild(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public long getChildId(int groupPosition, int childPosition) {
            return childPosition;
        }

        @Override
        public View getChildView(final int groupPosition, final int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent) {
            TextView tv = new TextView(SampleActivity.this);
            tv.setText("child");
            tv.setTextColor(Color.BLACK);
            tv.setTextSize(20);
            tv.setPadding(15, 5, 5, 5);
            tv.setBackgroundColor(Color.YELLOW);
            tv.setLayoutParams(new ListView.LayoutParams(
                    ViewGroup.LayoutParams.FILL_PARENT, ViewGroup.LayoutParams.FILL_PARENT));

            return tv;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return 5;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return groupPosition;
        }

        @Override
        public int getGroupCount() {
            return 1;
        }

        @Override
        public long getGroupId(int groupPosition) {
            return groupPosition;
        }

        @Override
        public View getGroupView(final int groupPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent) {
            TextView tv = new TextView(SampleActivity.this);
            tv.setText("-->Second Level");
            tv.setTextColor(Color.BLACK);
            tv.setTextSize(20);
            tv.setPadding(12, 7, 7, 7);
            tv.setBackgroundColor(Color.RED);

            return tv;
        }

        @Override
        public boolean hasStableIds() {
            // TODO Auto-generated method stub
            return true;
        }

        @Override
        public boolean isChildSelectable(int groupPosition, int childPosition) {
            // TODO Auto-generated method stub
            return true;
        }
    }
}

xml:-

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">
    <ExpandableListView
        android:id="@+id/ParentLevel"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:groupIndicator="@null"/>
</LinearLayout>

Answer 1

set these callbacks for your expandable list. This is my working example in which i have implemented Expandable list view on navigation drawer.. And you can just refer same example to populate it activity also https://stackoverflow.com/a/38767046/6350239

   expListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

            @Override
            public boolean onGroupClick(ExpandableListView parent, View v,
                                        int groupPosition, long id) {
                // Toast.makeText(getApplicationContext(),
                // "Group Clicked " + listDataHeader.get(groupPosition),
                // Toast.LENGTH_SHORT).show();
                return false;
            }
        });
        // Listview Group expanded listener
        expListView.setOnGroupExpandListener(new ExpandableListView.OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Expanded",
                        Toast.LENGTH_SHORT).show();
            }
        });

        // Listview Group collasped listener
        expListView.setOnGroupCollapseListener(new ExpandableListView.OnGroupCollapseListener() {

            @Override
            public void onGroupCollapse(int groupPosition) {
                Toast.makeText(getApplicationContext(),
                        listDataHeader.get(groupPosition) + " Collapsed",
                        Toast.LENGTH_SHORT).show();

            }
        });

        // Listview on child click listener
        expListView.setOnChildClickListener(new ExpandableListView.OnChildClickListener() {

            @Override
            public boolean onChildClick(ExpandableListView parent, View v,
                                        int groupPosition, int childPosition, long id) {
                // TODO Auto-generated method stub
                // Temporary code:

                // till here
                Toast.makeText(
                        getApplicationContext(),
                        listDataHeader.get(groupPosition)
                                + " : "
                                + listDataChild.get(
                                listDataHeader.get(groupPosition)).get(
                                childPosition), Toast.LENGTH_SHORT)
                        .show();
                return false;
            }
        });}