mCollapsedHeight always 0 , when click to close the ExpandView

[ImportEffort]

The XML Layout is：

<com.ms.square.android.expandabletextview.ExpandableTextView
            xmlns:android="http://schemas.android.com/apk/res/android"
            xmlns:expandableTextView="http://schemas.android.com/apk/res-auto"
            android:id="@+id/expand_text_view"
            android:layout_width="100dp"
            android:layout_height="wrap_content"
            expandableTextView:animDuration="0"
            expandableTextView:maxCollapsedLines="2">

            <TextView
                android:id="@id/expandable_text"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:textColor="#666666"
                android:textSize="16sp"/>

            <ImageButton
                android:id="@id/expand_collapse"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="right|bottom"
                android:background="@android:color/transparent"
                android:padding="16dp"/>
        </com.ms.square.android.expandabletextview.ExpandableTextView>

in Adapter i do :

`               
private SparseBooleanArray favorList2 = new SparseBooleanArray();
public void onBindItemViewHolder(RecyclerView.ViewHolder holder, int position) {
...
       threeColumnItemViewHolder.expTv1.setText(stringList.get(2) + stringList.get(2) + stringList.get(2),favorList2,position);
.....
}
`

when i unfold the item the item is Invisible, but when scroll out screen then it visible when it in screen next time