open-keychain/OpenKeychain/src/main/res/layout/foldable_linearlayout.xml

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

    <LinearLayout
        android:id="@+id/foldableControl"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:clickable="true">

        <ImageView
            android:id="@+id/foldableIcon"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center_vertical"
            android:layout_marginRight="10dp"
            android:src="@drawable/ic_expand_more_black_24dp" />

        <TextView
            android:id="@+id/foldableText"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/none"
            android:layout_gravity="center_vertical"
            android:textColor="?attr/colorHeaderText" />
    </LinearLayout>

    <LinearLayout
        android:id="@+id/foldableContainer"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:visibility="gone" />
</LinearLayout>