Weird height problem with ImageView

[ericntd]

My grid_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/ListItemProduct"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@android:color/holo_orange_dark"
    android:gravity="center_vertical"
    android:orientation="vertical"
    android:paddingLeft="@dimen/margin_sm"
    android:paddingRight="@dimen/margin_sm"
    android:paddingTop="0dp"
    android:layout_marginTop="0dp">

    <ImageView
        android:id="@+id/imgProduct"
        android:layout_width="match_parent"
        android:layout_height="50dp"
        android:layout_gravity="center"
        android:layout_marginTop="0dp"
        android:scaleType="centerInside"
        android:src="@drawable/ic_home_black_24dp"
        android:background="@android:color/holo_blue_bright"/>

    <!--<ImageView-->
        <!--android:layout_width="wrap_content"-->
        <!--android:layout_height="wrap_content"-->
        <!--android:layout_marginTop="-24dp"-->
        <!--android:id="@+id/imageView4"-->
        <!--android:src="@drawable/ic_favorite_border_black_24dp"-->
        <!--android:layout_gravity="right"/>-->

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textSpecial"/>

    <TextView
        android:id="@+id/textBrand"
        android:layout_width="match_parent"
        android:layout_height="0dp"
        android:textAppearance="?android:attr/textAppearanceMedium"
        android:layout_weight="1"
        android:singleLine="true"
        android:maxLines="1"
        android:textSize="@dimen/font_size_sm"
        android:textStyle="bold" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textName"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:orientation="horizontal" >

        <TextView
            android:id="@+id/textPrice"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:textAppearance="?android:attr/textAppearanceMedium"
            android:layout_weight="1"
            android:singleLine="true"
            android:maxLines="1"
            android:textSize="@dimen/font_size_sm"
            android:textStyle="bold" />

        <TextView
            android:id="@+id/textSalePrice"
            android:layout_width="0dp"
            android:layout_height="wrap_content"
            android:layout_marginBottom="@dimen/activity_vertical_margin"
            android:textStyle="bold"
            android:layout_weight="1"
            android:gravity="end"
            android:textColor="@color/colorAccent"
            android:textSize="@dimen/font_size_sm" />

    </LinearLayout>

    <android.support.v7.widget.AppCompatRatingBar
        android:id="@+id/ratingBar2"
        style="?android:attr/ratingBarStyleSmall"
        android:progressTint="@color/colorAccent"
        android:backgroundTint="@color/colorAccent"
        android:secondaryProgressTint="@color/colorAccent"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:isIndicator="true"
        android:numStars="5"
        android:stepSize="0.1" />

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="New Text"
        android:id="@+id/textVariants"/>

</LinearLayout>

I printed out the image views getHeight() and getMeasuredHeight() and got 0 for both.
When I changed the span count for GridLayoutManager to 1, all images have correct height.
When I changed the span count to 3, only the last of the 1st row, first of 2nd row, last of 3rd row and so on have the correct image height.

[ericntd]

Sorry, it doesn't have do with your library, I've fixed it myself