Multiple level expandable lists

[Gary Down]

Being new to this (android and java) I have hit a wall. The first level list displays but appears to be inactive (nothing happens when clicked).

The source and the XML files are below.

Any help will be appreciated.

Cheers,
Gary.

Activity_main.xml
<RelativeLayout 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" tools:context="com.newShop.MainActivity" > <ExpandableListView android:id="@+id/TopLevel" android:layout_width="match_parent" android:layout_height="fill_parent"> </ExpandableListView> <ExpandableListView android:id="@+id/MiddleLevel" android:layout_width="match_parent" android:layout_height="fill_parent"> </ExpandableListView> <ExpandableListView android:id="@+id/BottomLevel" android:layout_width="match_parent" android:layout_height="fill_parent"> </ExpandableListView> </RelativeLayout>

all_levels_text
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" tools:context="com.newShop.MainActivity" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:padding="10dp"> <TextView android:id="@+id/leveltextitem" android:layout_width="wrap_content" android:layout_height="wrap_content"/> </LinearLayout>

package com.newShop;

import android.app.Activity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseExpandableListAdapter;
import android.widget.ExpandableListView;
import android.widget.ExpandableListView.OnGroupExpandListener;
import android.widget.TextView;
import android.util.Log;

public class MainActivity extends Activity {

    ExpandableListView topLevelListView;

    private int[] groupsForEachLevel = {3, 3, 3, 3, 3, 3};

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        topLevelListView = (ExpandableListView) findViewById(R.id.TopLevel);
        ShopListAdapter bla = new ShopListAdapter(MainActivity.this, 0);

        topLevelListView.setOnGroupExpandListener(new OnGroupExpandListener() {

            @Override
            public void onGroupExpand(int groupPosition) {
                for (int i = 0; i < groupsForEachLevel[0]; i++) {
                    if (i != groupPosition) {
                        topLevelListView.collapseGroup(i);
                    }
                }
            }
        });
        topLevelListView.setAdapter(bla);
    }

    public class ShopListView extends ExpandableListView {
        public ShopListView(Context context) {
            super(context);
        }

        @Override
        public void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
            widthMeasureSpec = MeasureSpec.makeMeasureSpec(1000, MeasureSpec.AT_MOST);
            heightMeasureSpec = MeasureSpec.makeMeasureSpec(1000, MeasureSpec.AT_MOST);
            super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        }
    }

    public class ShopListAdapter extends BaseExpandableListAdapter {
        private ShopListView nextLevelListView;
        private LayoutInflater layoutInflater;
        private int level;
        private int groupsInThisLevel;
        private int childCount;

        public ShopListAdapter(Activity context, int level) {
            layoutInflater = LayoutInflater.from( context );

            this.level = level;
            this.groupsInThisLevel = groupsForEachLevel[level];

            if (level == groupsForEachLevel.length - 1) {
                this.childCount = 0;
            } else {
                this.childCount = 1;
            }

        }

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

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

        @Override
        public View getChildView(int groupPosition, int childPosition,
                                 boolean isLastChild, View convertView, ViewGroup parent) {
            Log.w("****", "getChildView");
            Log.w("****", "getChildView level " + Integer.toString(level));
            Log.w("****", "getChildView group " + Integer.toString(groupPosition));
            Log.w("****", "getChildView child " + Integer.toString(childPosition));
            Log.w("****", "getChildView length " + Integer.toString(groupsForEachLevel.length));
            Log.w("****", "getChildView last " + Boolean.toString(isLastChild));

            int nextLevel = this.level + 1;
            if (nextLevel < groupsForEachLevel.length) {

                Log.w("****", "new level >>" + Integer.toString(nextLevel));

                nextLevelListView = (ShopListView) findViewById(R.id.MiddleLevel);
                ShopListAdapter bla = new ShopListAdapter(MainActivity.this, nextLevel);
                nextLevelListView.setAdapter(bla);

                nextLevelListView.setOnGroupExpandListener(new OnGroupExpandListener() {

                    @Override
                    public void onGroupExpand(int groupPosition) {
                        for (int i = 0; i < getGroupCount(); i++) {
                            if (i != groupPosition) {
                                nextLevelListView.collapseGroup(i);
                            }
                        }
                    }
                });

            }
            return nextLevelListView;
        }

        @Override
        public int getChildrenCount(int groupPosition) {
            return this.childCount;
        }

        @Override
        public Object getGroup(int groupPosition) {
            return 0;
        }

        @Override
        public int getGroupCount() {
            return this.groupsInThisLevel;
        }

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

        @Override
        public View getGroupView(int groupPosition, boolean isExpanded,
                                 View convertView, ViewGroup parent) {

            Log.w("****", "getGroupView - isexpanded " + Boolean.toString(isExpanded));
            Log.w("****", "getGroupView : level " + Integer.toString(level));
            Log.w("****", "getGroupView : group " + Integer.toString(groupPosition));

            View v = convertView != null ? convertView : layoutInflater.inflate(R.layout.all_levels_text, parent, false);

            TextView thisGroup = (TextView) v.findViewById(R.id.leveltextitem);
            thisGroup.setPadding(50 * (level + 1), 5, 5, 5);
            thisGroup.setText(Integer.toString(level) + " " + Integer.toString(groupPosition));

            return v;

        }

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

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

}