"android.view.View cannot be cast to android.view.ViewGroup" exception

I know i am late to the party, but just in case some is banging his head for same problem, here is one possible solution that worked for me when i was trying to add zoom functionality in my pager adapter images. Info: this is not the exact answer, but a possible solution for those who are facing the same problem. I am posting this because i didn't fount this solution approach anywhere in stackOverflow

  <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <ImageView
            android:id="@+id/head_image"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:scaleType="centerCrop"
            android:src="@drawable/head_image" />

    </RelativeLayout>

In the above code, just Replace <ImageView with <com.yourPackage.TouchImageView.

TouchImageView (or any other class) is a custom class (you need to make)which should extend android.support.v7.widget.AppCompatImageView

I think you should use

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

    <ImageView
        android:id="@+id/imgTile"
        android:src="@drawable/tile_background"
        android:contentDescription="@string/CD_TILE_BACKGROUND_IMAGE"
        android:layout_width="match_parent"
        android:layout_height="match_parent">
    </ImageView>

</LinearLayout >

as View does not have any function like add(other_view) you can add a view in ViewGorup ....