Multiple click events on expandablelistview's group element

Question

I have two question about expandablelistview click events on groupView's (not child)

1. When i have child in my GroupView, i'm able to get the groupPosition using below snippet

   expandableListView.setOnGroupClickListener(new ExpandableListView.OnGroupClickListener() {

       @Override
       public boolean onGroupClick(ExpandableListView parent, View v, int groupPosition, long id) {
           Log.d("Clicked on item: ", ""+groupPosition);
           return false;
       }
   });
   

but when i don't have any child, Unfortunately 'MyApp' has stopped on mouse click. In this case, How to get the groupPosition?

2. I have two buttons in my expandablelistview's groupView layout. now i need to register two different click events for both the buttons. This groupView also didn't has child. I searched in SO thoroughly, but i got no clue on this.

       <LinearLayout
           android:layout_below="@id/qtd_prc_cont"
           android:layout_width="match_parent" android:layout_height="wrap_content" android:gravity="center">
           <Textview
               android:layout_width="wrap_content" android:layout_height="wrap_content"  android:id="@+id/group_text" android:text="Group 1" />
           <Button
               android:id="@+id/btn_reject"
               android:layout_width="90dp" android:layout_height="30dp" android:text="Reject" android:textAllCaps="false" android:background="@drawable/reject_button_styles"
               android:layout_marginRight="60dp" android:textColor="#a1a2a1" android:textSize="13dp"/>
           <Button
               android:id="@+id/btn_accept"
               android:layout_width="90dp" android:layout_height="30dp" android:text="Accept" android:textAllCaps="false" android:background="@drawable/button_radius"
               android:textColor="@color/colorWhite" android:textSize="13dp"/>
       </LinearLayout>
   

Here's my adapter class:

public class OfferedTrucksAdapter extends BaseExpandableListAdapter {
private Context context;
private ArrayList<QuotedListGroup> groups;

public OfferedTrucksAdapter(Context context, ArrayList<QuotedListGroup> groups) {
    this.context = context;
    this.groups = groups;
}

@Override
public Object getChild(int groupPosition, int childPosition) {
    ArrayList<QuotedListItem> chList = groups.get(groupPosition).getItems();
    return chList.get(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) {

    QuotedListItem child = (QuotedListItem) getChild(groupPosition, childPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.activity_quoted_list_item, null);
    }
    TextView container_label = (TextView) convertView.findViewById(R.id.container);
    container_label.setText(child.getContainer());

    TextView truck_number = (TextView) convertView.findViewById(R.id.truck_number);
    truck_number.setText(child.getTruckNumber().toString());

    TextView truck_weight = (TextView) convertView.findViewById(R.id.truck_weight);
    truck_weight.setText(child.getTruckWeight().toString());

    return convertView;
}

@Override
public int getChildrenCount(int groupPosition) {
    ArrayList<QuotedListItem> chList = groups.get(groupPosition).getItems();
    return chList.size();
}

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

@Override
public int getGroupCount() {
    return groups.size();
}

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

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    QuotedListGroup group = (QuotedListGroup) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater inf = (LayoutInflater) context
                .getSystemService(context.LAYOUT_INFLATER_SERVICE);
        convertView = inf.inflate(R.layout.activity_offered_trucks_group, null);
    }

    if(groupPosition%2 == 0) {
        convertView.findViewById(R.id.offered_trucks_group).setVisibility(View.VISIBLE);
        convertView.findViewById(R.id.offered_price_group).setVisibility(View.GONE);

        TextView destination = (TextView) convertView.findViewById(R.id.offered_destination);
        destination.setText(group.getDestination());

        TextView trucks = (TextView) convertView.findViewById(R.id.offered_trucks);
        trucks.setText(group.getTrucks() + "");

        TextView date_label = (TextView) convertView.findViewById(R.id.offered_date_label);
        date_label.setText(group.getDateLabel().toString());

        TextView material = (TextView) convertView.findViewById(R.id.offered_material);
        material.setText(group.getMaterial().toString());

        TruckaroIconView see_hide_icon = (TruckaroIconView) convertView.findViewById(R.id.offered_see_hide_icon);
        TextView see_hide_label = (TextView) convertView.findViewById(R.id.offered_see_hide_label);
        if(isExpanded) {
            see_hide_label.setText("Hide Trucks");
            see_hide_icon.setRotation(180);
        } else {
            see_hide_label.setText("See Trucks");
            see_hide_icon.setRotation(0);
        }
    } else {
        convertView.findViewById(R.id.offered_trucks_group).setVisibility(View.GONE);
        convertView.findViewById(R.id.offered_price_group).setVisibility(View.VISIBLE);

        TextView offeredPrice = (TextView) convertView.findViewById(R.id.offered_price);
        offeredPrice.setText(group.getOfferedPrice());

        TextView quotedPrice = (TextView) convertView.findViewById(R.id.quoted_price);
        quotedPrice.setText(group.getQuotedPrice());

    }
    return convertView;
}

protected static class RowViewHolder {
    public Button buttonReject, buttonAccept;
}

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

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

}

Based on accept/reject button clicks, i need to pass the Textview's data to next activity through intent.

Here is how my expandable listview looks like:

In the above image, there are four list items. 1st and 3rd have children but 2nd and 4th has no child. When i click on 2nd element accept button, i need to pass the 1st elemnt data to next activity. I'm unable to set click events on those buttons.

Please help me out of this.

Thanks in advance.

Answer 1

Okay. If I understand your concern correctly, the behavior you're aiming for is to pass an element of the upper item (in your screenshot, if Accept button is clicked, a value from the upper item will be retrieved and passed to another activity through an intent.

Here's what I got:

@Override
    public View getGroupView(final int groupPosition, boolean isExpanded,
                             View convertView, ViewGroup parent) {
        QuotedListGroup group = (QuotedListGroup) getGroup(groupPosition);
        if (convertView == null) {
            LayoutInflater inf = (LayoutInflater) context
                    .getSystemService(context.LAYOUT_INFLATER_SERVICE);
            convertView = inf.inflate(R.layout.activity_offered_trucks_group, null);
        }

        if (groupPosition % 2 == 0) {

            // Removed some code here.

        } else {
            convertView.findViewById(R.id.offered_trucks_group).setVisibility(View.GONE);
            convertView.findViewById(R.id.offered_price_group).setVisibility(View.VISIBLE);

            TextView offeredPrice = (TextView) convertView.findViewById(R.id.offered_price);
            offeredPrice.setText(group.getOfferedPrice());

            TextView quotedPrice = (TextView) convertView.findViewById(R.id.quoted_price);
            quotedPrice.setText(group.getQuotedPrice());

            // Added code here ----

            // Initialize the buttons.
            Button btnAccept = (Button) convertView.findViewById( < insert_btn_id_here >);
            Button btnReject = (Button) convertView.findViewById( < insert_btn_id_here >);

            // Set onClickListeners for the buttons.
            btnAccept.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {

                    /*
                    Modify with the object you have, then pass the group position - 1
                    (double check this, you just need to pass the position of the upper item).
                    */
                    Object groupObject = getGroup(groupPosition - 1);

                    /*
                    Get the value from the groupObject that you want to include in the intent.
                    NOTE: I'm just using some sample codes, modify it to what you need.
                    */
                    String sampleStr = groupObject.destination.getText().toString();

                    /*
                    Intent stuff, I think you know this already.
                     */

                    Intent intent = new Intent(context, SampleActivity.class);
                    intent.putExtra("SAMPLE_KEY", sampleStr);
                    context.startActivity(intent);

                }
            });

            btnReject.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    // your code for reject button here.
                }
            });

            // Until here ----

        }

        return convertView;
    }

I simply added the listeners for your buttons (accept, reject) inside the else statement. You need to modify it to what you need since I don't have visibility with the rest of your code. Let me know if you have questions. Cheers! :D