CODEWITHSUNDEEP
androidandroid-layoutlistviewexpandablelistview
Sparkplug
Sparkplug

Reputation: 495

Changing ListView to ExpandableListView

I have a ListView in my Activity but now I want to change it to an ExpandableListView. Do I need to change my listview completely or can I add expandableListView to my existing listView?

Upvotes: 1

Views: 1780

Answers (3)

Gr8Warrior
Gr8Warrior

Reputation: 719

"Here is a pretty good example for ExpandableListView"

ExpandableListView inherits from ListView. It add more things to the ListView implementation like expanding and collapsing property, header and child views etc. When moving from listView to expandable list view you'll need to make changes in :

  1. XML view
  2. Adapter to implement ExpandableListAdapter
  3. While Setting the adapter you'll need to new ExpandableListAdapter(this, list of DataHeader for each list, list of DataChild that you want to populate beneath each header);

Upvotes: 0

Sameer
Sameer

Reputation: 114

This is the example i used.. you can change it and use it.

// ListView code

public class FevList extends ExpandableListActivity {
        String title;
        String url;
        SQLiteDatabase database;
        DbUtil db;
        HashMap<String, String> map = new HashMap<String, String>();
        ArrayList<HashMap<String, String>> subjectList = new ArrayList<HashMap<String, String>>();


        @SuppressWarnings("unchecked")
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            try {
                super.onCreate(savedInstanceState);
                setContentView(R.layout.exlist);
                db = new DbUtil();
                database = db.openConnection(this);
                // Thread for getting values of title from DataBase.
                SimpleExpandableListAdapter expListAdapter = new SimpleExpandableListAdapter(
                        this, createGroupList(), R.layout.group_row,
                        new String[] { "subject" }, new int[] { R.id.row_name },
                        createChildList(), R.layout.child_row,
                        new String[] { "title" }, new int[] { R.id.grp_child });
                setListAdapter(expListAdapter);
                registerForContextMenu(getExpandableListView());
            } catch (Exception e) {
                e.printStackTrace();
            }

        }



 // code for adapter



/* Creating the Hashmap for the row */
                ArrayList<HashMap<String, String>> result = new ArrayList<HashMap<String, String>>();

                @SuppressWarnings("unchecked")
                private List createGroupList() {

    // write your code here.

                    return (List) result;

                }

                /* creatin the HashMap for the children */

                @SuppressWarnings("unchecked")
                private List createChildList() {

    // write your code here.
                    return result;
                }

                public void onContentChanged() {

                    System.out.println("onContentChanged");

                    super.onContentChanged();

                }

                /* This function is called on each child click */

                public boolean onChildClick(ExpandableListView parent, View v,
                        int groupPosition, int childPosition, long id) {

    // write your code here.

                    return true;

                }

                /* This function is called on expansion of the group */

                public void onGroupExpand(int groupPosition) {

                    try {

                        System.out.println("Group exapanding Listener => groupPosition = "
                                + groupPosition);

                    } catch (Exception e) {

                        System.out.println(" groupPosition Errrr +++ " + e.getMessage());

                    }

                }
            }

Upvotes: 1

DrMartens
DrMartens

Reputation: 451

Try something like this:

public class PharmaciesListScreen extends ExpandableListActivity {

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        ExpandableListView expandbleLis = getExpandableListView();

        List<RegionItem> regionsList = new RegionsDBUtils(getApplication())
                .getAllRegions();

        PharmaciesListAdapter mNewAdapter = new PharmaciesListAdapter(regionsList);
        mNewAdapter
                .setInflater((LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE), this);
        getExpandableListView().setAdapter(mNewAdapter);
    }

Adapter code:

public class PharmaciesListAdapter extends BaseExpandableListAdapter {

 @Override
public View getChildView(int groupPosition, final int childPosition,
            boolean isLastChild, View convertView, ViewGroup parent) {
       //set up here you child elements.
       //you can use inflater here
    }

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = minflater.inflate(R.layout.grouprow, null);
        }
        ((CheckedTextView) convertView).setText(mRegionsList.get(groupPosition).region);
        ((CheckedTextView) convertView).setChecked(isExpanded);
        return convertView;
    }

public void setInflater(LayoutInflater mInflater, Activity act) {
    this.minflater = mInflater;
    activity = act;
}
}

Note: in adapter you'll need to implement more methods. Also, take a look at this post: Android ExpandableListView - Looking for a tutorial

Upvotes: 0

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