[ACCEPTED]-ExpandableListView - hide indicator for groups with no children-expandablelistview

Try this >>>

for all items

 getExpandableListView().setGroupIndicator(null);

In xml

android:groupIndicator="@null"

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The android:groupIndicator property takes a state enabled drawable. That 12 is, you can set different image for different 11 states.

When the group has no children, the 10 corresponding state is 'state_empty'

See 9 these reference links:

this and this

For state_empty, you can 8 set a different image which is not confusing, or, simply 7 use transparent color to display nothing...

Add 6 this item in your stateful drawable along 5 with others....

<item android:state_empty="true" android:drawable="@android:color/transparent"/>

So, your statelist 4 can be like this:

<selector xmlns:android="http://schemas.android.com/apk/res/android">
    <item android:state_empty="true" android:drawable="@android:color/transparent"/>
    <item android:state_expanded="true" android:drawable="@drawable/my_icon_max" />
    <item android:drawable="@drawable/my_icon_min" />
</selector>

In case you are using an 3 ExpandableListActivity, you can set the 2 groupindicator in onCreate as follows:

getExpandableListView().setGroupIndicator(getResources().getDrawable(R.drawable.my_group_statelist));

I 1 have tested this to be working.

Based on StrayPointer's answer and the code 12 from the blog, you can simplify the code 11 even more:

In your xml add the folowing to 10 ExpandableListView:

android:groupIndicator="@android:color/transparent"

Then in the Adapter you 9 do the following:

@Override
protected void bindGroupView(View view, Context paramContext, Cursor cursor, boolean paramBoolean){
    **...**

    if ( getChildrenCount( groupPosition ) == 0 ) {
       indicator.setVisibility( View.INVISIBLE );
    } else {
       indicator.setVisibility( View.VISIBLE );
       indicator.setImageResource( isExpanded ? R.drawable.list_group_expanded : R.drawable.list_group_closed );
    }
}

By using the setImageResource 8 method you get it all done with a one-liner. You 7 do not need the three Integer arrays in 6 your adapter. You also do not need an XML 5 selector for state expanded and collapsed. All 4 is done via Java.

Plus, this approach also 3 displays the correct indicator when a group 2 is expanded by default what does not work 1 with the code from the blog.

As mentioned in a different answer, since 7 Android treats an un-expanded list group 6 as empty, the icon is not drawn even if 5 the group has children.

This link solved 4 the problem for me: http://mylifewithandroid.blogspot.com/2011/06/hiding-group-indicator-for-empty-groups.html

Basically you have to 3 set the default drawable as transparent, move 2 the drawable into your group view as an 1 ImageView and toggle the image in your adapter.

In XML

android:groupIndicator="@null"

In ExpandableListAdapter -- > getGroupView copy following code

if (this.mListDataChild.get(this.mListDataHeader.get(groupPosition)).size() > 0){
      if (isExpanded) {
          arrowicon.setImageResource(R.drawable.group_up);
      } else {
          arrowicon.setImageResource(R.drawable.group_down);
      }
}

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In your code just use the custom xml for 3 group list and in that put the ImageView for GroupIndicator.

And 2 Add below arrays in your ExpandableListAdapter

private static final int[] EMPTY_STATE_SET = {};
private static final int[] GROUP_EXPANDED_STATE_SET = { android.R.attr.state_expanded };
private static final int[][] GROUP_STATE_SETS = { EMPTY_STATE_SET, // 0
GROUP_EXPANDED_STATE_SET // 1
};

also in ExpandableListAdapter's method 1 add same things as below

public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) 
{ 
    if (convertView == null) 
    {
        LayoutInflater infalInflater = (LayoutInflater) this._context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.row_group_list, null);
    }

    //Image view which you put in row_group_list.xml
    View ind = convertView.findViewById(R.id.iv_navigation);
    if (ind != null)
    {
        ImageView indicator = (ImageView) ind;
        if (getChildrenCount(groupPosition) == 0) 
        {
            indicator.setVisibility(View.INVISIBLE);
        } 
        else 
        {
            indicator.setVisibility(View.VISIBLE);
            int stateSetIndex = (isExpanded ? 1 : 0);
            Drawable drawable = indicator.getDrawable();
            drawable.setState(GROUP_STATE_SETS[stateSetIndex]);
        }
    }

    return convertView;
}

Reference: http://mylifewithandroid.blogspot.in/2011/06/hiding-group-indicator-for-empty-groups.html

this could be another way from XML, set 1 android:groupIndicator="@null"

Reference Link: https://stackoverflow.com/a/5853520/2624806

suggest you my solution:

1)Clear default 1 groupIndicator :

<ExpandableListView
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"       
    android:layout_width="wrap_content"
    android:layout_height="240dp"        
    android:layout_gravity="start"
    android:background="#cccc"  
    android:groupIndicator="@android:color/transparent"     
    android:choiceMode="singleChoice"
    android:divider="@android:color/transparent"        
    android:dividerHeight="0dp"  
     />

2) in ExpandableAdapter:

@Override
public View getGroupView(int groupPosition, boolean isExpanded,
        View convertView, ViewGroup parent) {
    if (convertView == null) {
        convertView = new TextView(context);
    }
    ((TextView) convertView).setText(groupItem.get(groupPosition));     
    ((TextView) convertView).setHeight(groupHeight);
    ((TextView) convertView).setTextSize(groupTextSize);

    //create groupIndicator using TextView drawable
    if (getChildrenCount(groupPosition)>0) {
        Drawable zzz ;
        if (isExpanded) {
            zzz = context.getResources().getDrawable(R.drawable.arrowup);
        } else {
            zzz = context.getResources().getDrawable(R.drawable.arrowdown);
        }                               
        zzz.setBounds(0, 0, groupHeight, groupHeight);
        ((TextView) convertView).setCompoundDrawables(null, null,zzz, null);
    }       
    convertView.setTag(groupItem.get(groupPosition));       

    return convertView;
}

Just wanted to improve on Mihir Trivedi's 5 answer. You can place this within getGroupView() that's 4 inside MyExpandableListAdapter class

    View ind = convertView.findViewById(R.id.group_indicator);
    View ind2 = convertView.findViewById(R.id.group_indicator2);
    if (ind != null)
    {
        ImageView indicator = (ImageView) ind;
        if (getChildrenCount(groupPosition) == 0)
        {
            indicator.setVisibility(View.INVISIBLE);
        }
        else
        {
            indicator.setVisibility(View.VISIBLE);
            int stateSetIndex = (isExpanded ? 1 : 0);

            /*toggles down button to change upwards when list has expanded*/
            if(stateSetIndex == 1){
                ind.setVisibility(View.INVISIBLE);
                ind2.setVisibility(View.VISIBLE);
                Drawable drawable = indicator.getDrawable();
                drawable.setState(GROUP_STATE_SETS[stateSetIndex]);
            }
            else if(stateSetIndex == 0){
                ind.setVisibility(View.VISIBLE);
                ind2.setVisibility(View.INVISIBLE);
                Drawable drawable = indicator.getDrawable();
                drawable.setState(GROUP_STATE_SETS[stateSetIndex]);
            }
        }
    }

...and 3 as for the layout view, this is how my group_items.xml 2 appears to be

<RelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">

<TextView
    android:id="@+id/group_heading"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:paddingLeft="20dp"
    android:paddingTop="16dp"
    android:paddingBottom="16dp"
    android:textSize="15sp"
    android:textStyle="bold"/>

<ImageView
    android:id="@+id/group_indicator"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@android:drawable/arrow_down_float"
    android:layout_alignParentRight="true"
    android:paddingRight="20dp"
    android:paddingTop="20dp"/>

<ImageView
    android:id="@+id/group_indicator2"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@android:drawable/arrow_up_float"
    android:layout_alignParentRight="true"
    android:visibility="gone"
    android:paddingRight="20dp"
    android:paddingTop="20dp"/>

Hope that helps...remember 1 to leave an upvote

Use this it is perfectly working for me.

<selector xmlns:android="http://schemas.android.com/apk/res/android">

<item android:drawable="@drawable/group_indicator_expanded" android:state_empty="false" android:state_expanded="true"/>
<item android:drawable="@drawable/group_indicator" android:state_empty="true"/>
<item android:drawable="@drawable/group_indicator"/>

</selector>

0

Have you tried to change ExpandableListView's attribute android:groupIndicator="@null"?

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Simply, you create a new xml layout with 8 height=0 for the hidden group header. For 7 example, it's 'group_list_item_empty.xml'

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"              
              android:layout_width="match_parent"
              android:layout_height="0dp">
</RelativeLayout>

Then 6 your normal group header layout is 'your_group_list_item_file.xml'

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
              android:layout_width="match_parent"
              android:layout_height="48dp"
              android:orientation="horizontal">
    ...your xml layout define...
</LinearLayout>

Finally, you 5 just update the getGroupView method in your 4 Adapter Class:

public class MyExpandableListAdapter extends BaseExpandableListAdapter{   

    //Your code here ...

    @Override
    public View getGroupView(int groupPosition, boolean isExpanded, View convertView, ViewGroup viewGroup) {
        if (Your condition to hide the group header){
            if (convertView == null || convertView instanceof LinearLayout) {
                LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
                convertView = mInflater.inflate(R.layout.group_list_item_empty, null);
            }           
            return convertView;
        }else{      
            if (convertView == null || convertView instanceof RelativeLayout) {
                LayoutInflater mInflater = (LayoutInflater) context.getSystemService(Activity.LAYOUT_INFLATER_SERVICE);
                convertView = mInflater.inflate(R.layout.your_group_list_item_file, null);              
            }   
            //Your code here ...
            return convertView;
        }
    }
}

IMPORTANT: The root tag of the layout 3 files (hidden and normal) must be different 2 (as above example, LinearLayout and RelativeLayout 1 )

The answers posted around here will make 8 your group indicator gone even when a group 7 has children.

To solve this, override the 6 group indicator.

First, set your group indicator 5 as null:

    ExpandableListView.setGroupIndicator(null);

Then, go to your xml that contains 4 the header, and add an ImageView with your 3 drawable.

After that, go to your ExpandableListAdapter.java, and 2 in the "getGroupView" section, do 1 the following:

public View getGroupView(int groupPosition, boolean isExpanded,
                         View convertView, ViewGroup parent) {
    String headerTitle = (String) getGroup(groupPosition);
    if (convertView == null) {
        LayoutInflater infalInflater = (LayoutInflater) this._context
                .getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        convertView = infalInflater.inflate(R.layout.list_group, null);
    }

    TextView lblListHeader = convertView
            .findViewById(R.id.lblListHeader); // this is your header

    ImageView groupIndicator = convertView.findViewById(R.id.group_indicator); // this is the ImageView included in your xml to override the indicator

    if (getChildrenCount(groupPosition) == 0) {
        convertView.setVisibility(View.GONE);
        lblListHeader.setVisibility(View.GONE);
        convertView.setPadding(0,0,0,0); //try not to include padding on your xml, and instead define the padding here.

    } else {
        convertView.setVisibility(View.VISIBLE);
        convertView.setPadding(8,8,8,0);
        lblListHeader.setVisibility(View.VISIBLE);
        lblListHeader.setTypeface(font);
        lblListHeader.setText(headerTitle);
        if (isExpanded) { //this is the part where we define our group indicator based on the expanded status of the adapter
            groupIndicator.setImageResource(R.drawable.group_indicator_expanded);
        } else {
            groupIndicator.setImageResource(R.drawable.group_indicator_empty);
        }
    }

    return convertView;
}