Android custom Expandablelistview does not trigger onChildClick

Question

I'm beginner for android programming. I've download the code from http://shenhengbin.wordpress.com and works fine but the only problem is doesn't trigger the onChildClick.

Here is the main activity

public class MenuCategory extends Activity {
        private ExpandableListView mExpandableListView;
        private List<GroupEntity> mGroupCollection;
        ExpandableListAdapter adapter;

        @Override
        public void onCreate(Bundle savedInstanceStater) {

            super.onCreate(savedInstanceState);
            setContentView(R.layout.menucategory);

            prepareResource();
            initPage();

        }


        private void prepareResource() {
            String data = null;
            FileInputStream fIn = null;
            InputStreamReader isr = null;
            String response = null;
            String getParam = "?get=menuCategory";
            try{
                fIn = openFileInput("fromfile.dat");
                isr = new InputStreamReader(fIn);
                int size = fIn.available(); 
                char[] inputBuffer = new char[size];
                isr.read(inputBuffer);
                data = new String(inputBuffer);
                isr.close();
                fIn.close();
                String[] dataSep = data.split("#");
                String Hs = dataSep[0];

                try {
                    response = CustomHttpClient.executeHttpGet(Hs+getParam);
                    String res = response.toString(); 
                    if(response.length()!=0){
                        mGroupCollection = new ArrayList<GroupEntity>();
                        JSONObject jsonObject = null;
                        JSONArray eventArray = new JSONArray(res);
                        for (int i = 0; i < eventArray.length(); i++) {
                            jsonObject = eventArray.getJSONObject(i);
                            GroupEntity ge = new GroupEntity();
                            ge.Name = jsonObject.getString("Cat");

                            JSONArray abc  = jsonObject.getJSONArray("SubCat");
                            for (int j=0; j<abc.length(); j++){
                                GroupItemEntity gi = ge.new GroupItemEntity();
                                gi.Name = abc.getString(j);
                                ge.GroupItemCollection.add(gi);
                            }
                            mGroupCollection.add(ge);   
                        }
                    }
                } catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }


            }catch(IOException e){
                e.printStackTrace(System.err);
            }
        }

        private void initPage() {
            mExpandableListView = (ExpandableListView) findViewById(R.id.expandableListView);
            adapter = new ExpandableListAdapter(this,mExpandableListView, mGroupCollection);
            mExpandableListView.setAdapter(adapter);
            registerForContextMenu(mExpandableListView);
        }
        public boolean onChildClick( ExpandableListView parent, View v, int groupPosition,int childPosition,long id) {
            String string = "Child Click";
            int duration = Toast.LENGTH_SHORT;
            Toast toast = Toast.makeText(getApplicationContext(), string, duration);
            toast.show();
            return false;
        }
    }

Here is the Custom BaseExpandableListAdapter

public class ExpandableListAdapter extends BaseExpandableListAdapter {

    private Context mContext;
    private ExpandableListView mExpandableListView;
    private List<GroupEntity> mGroupCollection;
    private int[] groupStatus;
    private int lastExpandedGroupPosition;

    public ExpandableListAdapter(Context pContext,
            ExpandableListView pExpandableListView,
            List<GroupEntity> pGroupCollection) {
        mContext = pContext;
        mGroupCollection = pGroupCollection;
        mExpandableListView = pExpandableListView;
        groupStatus = new int[mGroupCollection.size()];

        setListEvent();
    }

    private void setListEvent() {

        mExpandableListView
                .setOnGroupExpandListener(new OnGroupExpandListener() {

                    public void onGroupExpand(int arg0) {
                        // TODO Auto-generated method stub
                        groupStatus[arg0] = 1;
                        lastExpandedGroupPosition = arg0;
                    }
                });

        mExpandableListView
                .setOnGroupCollapseListener(new OnGroupCollapseListener() {

                    public void onGroupCollapse(int arg0) {
                        // TODO Auto-generated method stub
                        groupStatus[arg0] = 0;
                    }
                });
    }

    public String getChild(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return mGroupCollection.get(arg0).GroupItemCollection.get(arg1).Name;
    }

    public long getChildId(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return 0;
    }

    public View getChildView(int arg0, int arg1, boolean arg2, View arg3,
            ViewGroup arg4) {
        // TODO Auto-generated method stub

        ChildHolder childHolder;
        if (arg3 == null) {
            arg3 = LayoutInflater.from(mContext).inflate(
                    R.layout.list_group_item, null);

            childHolder = new ChildHolder();

            childHolder.title = (TextView) arg3.findViewById(R.id.item_title);
            arg3.setTag(childHolder);
        }else {
            childHolder = (ChildHolder) arg3.getTag();
        }

        childHolder.title.setText(mGroupCollection.get(arg0).GroupItemCollection.get(arg1).Name);
        return arg3;
    }

    public int getChildrenCount(int arg0) {
        // TODO Auto-generated method stub
        return mGroupCollection.get(arg0).GroupItemCollection.size();
    }

    public Object getGroup(int arg0) {
        // TODO Auto-generated method stub
        return mGroupCollection.get(arg0);
    }

    public int getGroupCount() {
        // TODO Auto-generated method stub
        return mGroupCollection.size();
    }

    public long getGroupId(int arg0) {
        // TODO Auto-generated method stub
        return arg0;
    }

    public View getGroupView(int arg0, boolean arg1, View arg2, ViewGroup arg3) {
        // TODO Auto-generated method stub
        GroupHolder groupHolder;
        if (arg2 == null) {
            arg2 = LayoutInflater.from(mContext).inflate(R.layout.list_group,
                    null);
            groupHolder = new GroupHolder();
            groupHolder.img = (ImageView) arg2.findViewById(R.id.tag_img);
            groupHolder.title = (TextView) arg2.findViewById(R.id.group_title);
            arg2.setTag(groupHolder);
        } else {
            groupHolder = (GroupHolder) arg2.getTag();
        }
        if (groupStatus[arg0] == 0) {
            groupHolder.img.setImageResource(R.drawable.group_down);
        } else {
            groupHolder.img.setImageResource(R.drawable.group_up);
        }
        groupHolder.title.setText(mGroupCollection.get(arg0).Name);

        return arg2;
    }

    class GroupHolder {
        ImageView img;
        TextView title;
    }

    class ChildHolder {
        TextView title;
    }

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

    public boolean isChildSelectable(int arg0, int arg1) {
        // TODO Auto-generated method stub
        return true;
    }

    @Override
    public void onGroupExpanded(int groupPosition){
        //collapse the old expanded group, if not the same
        //as new group to expand
        if(groupPosition != lastExpandedGroupPosition){
            mExpandableListView.collapseGroup(lastExpandedGroupPosition);
        }

        super.onGroupExpanded(groupPosition);           
        lastExpandedGroupPosition = groupPosition;
    }
}

Item Group layout

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:background="@drawable/group_header_bg"
    android:gravity="center_vertical" >

    <ImageView
        android:id="@+id/tag_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:layout_alignParentTop="true"
        android:layout_marginRight="10dip"
        android:src="@drawable/group_down"
        android:focusable="false"
         />

    <TextView
        android:id="@+id/group_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_centerVertical="true"
        android:layout_marginLeft="10dip"
        android:text=""
        android:textColor="#57810f"
        android:textSize="18dip"
        android:textStyle="bold"
        android:focusable="false"
         />

</RelativeLayout>

and here is the item child layout

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:baselineAligned="false"
    android:paddingTop="5dip" >

    <LinearLayout
        android:id="@+id/groupItem"
        android:layout_width="0dip"
        android:layout_height="fill_parent"
        android:layout_weight="1"
        android:background="@drawable/play_group_item"
        android:clickable="true" >


        <TextView
            android:id="@+id/item_title"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_marginBottom="15dip"
            android:layout_marginLeft="15dip"
            android:text="sample"
            android:textColor="#FFF38585"
            android:textSize="20sp"
            android:focusable="false"
             />

    </LinearLayout>

</LinearLayout>

please help me

Answer 1

In adapter you have a method called isChildSelectable() witch return false, that's the problem. Change returned value to true to resolve problem.

Answer 2

I was facing this problem, onChildClick was not being trigger.

I found this comment:

Solved, the problem is that if you have several textview's on the childview, the focusable property must be false (I don't know exactly why) adding android:descendantFocusability="blocksDescendants" to the view solved the problem

on Android ExpandableListView and onChildClick not working

So adding android:descendantFocusability="blocksDescendants" on childView worked for me.