ExpandableListView - How to set divider only between parent elements

user_621220 0
Viewed 39966

I want to put divider only between parent elements. When i set 

android:divider="@drawable/divider"
android creates divider between parent elements, but creates divider between child elements too. When i add 
android:childDivider="@color/transparent"
android removes the divider between child elements, but the free space between them remains. Why? I have tried to 
android:dividerHeight="0dp"
but nothing happened.

At all i want to set divider between parent elements, but i do not want any divider or empty space between child elements.

any ideas how to do that??

divider expandablelistview parent android
9 Answers

In order to remove dividers just from the child views and not between the parents in the expandable list:

add android:childDivider="#00000000" in the ExapandableListView attributes in XML:

<ExpandableListView
    android:id="@+id/elv"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:childDivider="#00000000" />

Refer this page for more information

user_29358980

I solved it by adding two views one to header and other to child item like shown below.

Header.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<RelativeLayout
android:id="@+id/rl_header"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/square_box"
android:padding="@dimen/padding_10">

<ImageView
    android:id="@+id/expandableIndicator"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:src="@drawable/ic_downarrow" />
</RelativeLayout>

<View
android:id="@+id/view_hidden"
android:layout_width="match_parent"
android:layout_height="10dp"
android:layout_below="@+id/rl_header"
android:background="@android:color/transparent" />
</RelativeLayout>

child.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<RelativeLayout
android:id="@+id/rl_childView"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@drawable/square_box"
android:padding="@dimen/padding_10">

<TextView
    android:id="@+id/tv_startDate"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentLeft="true"
    android:layout_centerVertical="true"
    android:gravity="left"
    android:paddingTop="@dimen/padding_5"
    android:paddingBottom="@dimen/padding_5"
    android:text="Start Date \nSep. 23, 2019"
    android:textSize="@dimen/text_16" />

<ImageView
    android:id="@+id/iv_arrow"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_alignParentRight="true"
    android:layout_centerVertical="true"
    android:src="@drawable/right_arrow" />
</RelativeLayout>

<View
    android:id="@+id/view_hidden"
    android:layout_width="match_parent"
    android:layout_height="10dp"
    android:layout_below="@+id/rl_childView"
    android:background="@android:color/transparent" />
</RelativeLayout>

Now add this code to your Adapter class. The idea is to show/hide the View when group is expanded/collapsed, show on child last item.

@Override
public View getGroupView(int listPosition, boolean isExpanded, View convertView, 
ViewGroup parent) {
String listTitle = (String) getGroup(listPosition);
String listCount = "(" + getChildrenCount(listPosition) + ")";

if (convertView == null) {
    LayoutInflater layoutInflater = (LayoutInflater) 
this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    convertView = layoutInflater.inflate(R.layout.expandable_header, null);
}
View view_hidden = convertView.findViewById(R.id.view_hidden);

if (isExpanded) {
    view_hidden.setVisibility(View.GONE);
} else {
    view_hidden.setVisibility(View.VISIBLE);
}

return convertView;
}

@Override
public View getChildView(int listPosition, final int expandedListPosition,
                     boolean isLastChild, View convertView, ViewGroup parent) {
final Medication medication = (Medication) getChild(listPosition, 
expandedListPosition);
if (convertView == null) {
    LayoutInflater layoutInflater = (LayoutInflater) 
this.context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
    convertView = layoutInflater.inflate(R.layout.expandable_item, null);
}

View view_hidden = convertView.findViewById(R.id.view_hidden);
if (isLastChild) {
    view_hidden.setVisibility(View.VISIBLE);
} else {
    view_hidden.setVisibility(View.GONE);
}

return convertView;
}
user_88418710
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