Neuron

Add code card.doToogleExpand();

I have the same error My Activity_Main with ViewPager: < android.support.v4.widget.DrawerLayout xmlns:tools="http://schemas.android.com/tools" xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" android:id="@+id/drawer_layout" android:layout_width="match_parent" android:layout_height="match_parent" android:fitsSystemWindows="true" tools:context=".activity.MainActivity"> ``` ```