Elevation increases with list position

Question

I have a recyclerview with a CardView. Even if I dont specify the elevation explicitly, as the items get to the bottom of the screen, the elevation increases. Haven't seen this behavior anywhere else, what can this be caused from?

<android.support.v7.widget.CardView
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:id="@+id/card_layout"
    app:cardElevation="6dp"
    app:cardPreventCornerOverlap="false"
    app:cardUseCompatPadding="true"
    android:foreground="?android:attr/selectableItemBackground"
    android:fitsSystemWindows="true"
    android:layout_marginLeft="4dp"
    android:layout_marginRight="4dp"
    >

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="@dimen/schedule_card_height"
        android:orientation="horizontal">

        <RelativeLayout
            android:layout_width="0dp"
            android:layout_height="match_parent"
            android:layout_weight="1">

            <TextView
                android:id="@+id/schedule_item_category"
                style="@style/Base.TextAppearance.AppCompat.Caption"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_centerInParent="true"
                android:background="@drawable/background_eventlist_category"
                android:gravity="center"
                android:padding="5dp"
                android:textAllCaps="true"
                tools:text="Interview"/>
        </RelativeLayout>

        <View android:layout_height="match_parent"
              android:layout_width="1dp"
              android:background="@color/colorIcons"

              />

        <RelativeLayout
            android:id="@+id/schedule_item_actions"
            android:layout_width="0dp"
            android:layout_weight="2"
            android:layout_height="wrap_content"
            android:background="@drawable/rounded_white"
            android:padding="12dp">

            <ProgressBar
                android:id="@+id/schedule_item_progress"
                style="?android:attr/progressBarStyle"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentRight="true"
                android:visibility="gone"/>


            <TextView
                android:id="@+id/schedule_item_title"
                style="@style/TextAppearance.AppCompat.Subhead"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:gravity="top|center_vertical"
                android:layout_alignParentLeft="true"
                android:layout_above="@+id/schedule_item_date"
                android:layout_alignParentTop="true"
                android:layout_toLeftOf="@+id/schedule_item.popup"
                android:ellipsize="end"
                android:maxLines="2"
                tools:text="Awesome event because i say so"/>

            <TextView
                android:id="@+id/schedule_item_date"
                style="@style/TextAppearance.AppCompat.Caption"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:gravity="center_vertical"
                android:layout_alignParentLeft="true"
                android:layout_alignParentEnd="true"
                android:layout_alignParentBottom="true"
                android:ellipsize="end"
                android:textAllCaps="true"
                android:maxLines="1"
                tools:text="25th April, 5PM (GMT)"/>

            <ImageView
                android:id="@+id/schedule_item.popup"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:src="@drawable/ic_dots"/>

        </RelativeLayout>

    </LinearLayout>

</android.support.v7.widget.CardView>

Answer 1

光线位于设备顶部附近的某个位置，向下朝向显示屏倾斜，因此项目越低，阴影距离就越大。