How to locate Textview on Imageview with background

I'm trying to locate text on image like this example. I tried Merge,FrameLayout,RelativeLayout but I got

cannot cast error

I gave layout_weight and height

but it does not solve my problem. Here is my layout

<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#11ffffff"
    android:orientation="vertical" >

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#F5F5F5"
    android:orientation="vertical"
   >

    <LinearLayout
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:paddingLeft="@dimen/feed_item_padding_left_right"
        android:paddingRight="@dimen/feed_item_padding_left_right" >

        <com.android.volley.toolbox.NetworkImageView
            android:id="@+id/profilePic"
            android:layout_width="@dimen/feed_item_profile_pic"
            android:layout_height="@dimen/feed_item_profile_pic"
            android:scaleType="fitCenter" >
        </com.android.volley.toolbox.NetworkImageView>

        <LinearLayout
            android:layout_width="fill_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:paddingLeft="@dimen/feed_item_profile_info_padd" >

            <TextView
                android:id="@+id/name"
                android:layout_width="fill_parent"
                android:layout_height="wrap_content"
                android:textSize="@dimen/feed_item_profile_name"
                android:textStyle="bold" />

        </LinearLayout>
    </LinearLayout>

    <TextView
        android:id="@+id/txtStatusMsg"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:paddingBottom="5dp"
        android:paddingLeft="@dimen/feed_item_status_pad_left_right"
        android:paddingRight="@dimen/feed_item_status_pad_left_right"
        android:paddingTop="@dimen/feed_item_status_pad_top" />

    <TextView
        android:id="@+id/txtUrl"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:linksClickable="true"
        android:paddingBottom="10dp"
        android:paddingLeft="@dimen/feed_item_status_pad_left_right"
        android:paddingRight="@dimen/feed_item_status_pad_left_right"
        android:textColorLink="@color/link" />



   <LinearLayout 
            android:layout_height="fill_parent"
            android:layout_width="fill_parent" 
            android:layout_weight="1"
            android:gravity="center" 
            android:orientation="vertical">

    <info.androidhive.listviewfeed.FeedImageView
        android:id="@+id/feedImage1"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="@color/white"
        android:scaleType="fitXY"
        android:visibility="visible" />

     <TextView
    android:id="@+id/timestamp"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:layout_marginBottom="20dip"
    android:layout_gravity="center_horizontal|bottom"
    android:padding="12dip"
    android:background="#AA000000"
    android:textColor="#ffffffff"
    android:textSize="@dimen/feed_item_timestamp" />
</LinearLayout>
</LinearLayout>

I want to locate @+id/timestamp over @+id/feedImage1

These are listview items, and some child has image and some has not.

Can you help me about it? I did not sleep for 2 days. I know, I miss something but I have to finish application ASAP for homework. I check almost all similar threads

Sorry for bad language, Regards