RelativeLayout-如果视图水平对齐，则无法使它们具有相同的垂直大小

Question

I have a layout which has two CardView 's and looks like this:

I wanted the right card to be fixed width (90dp) and the left one to automatically resize and fill the remaining space. I have currently done it like this:

    <RelativeLayout
        android:id="@+id/inventory_host_layout"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true">

        <android.support.v7.widget.CardView
            android:id="@+id/inventory_last_scanned_wrapper_card"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_marginLeft="20dp"
            android:layout_marginRight="20dp"
            android:layout_marginTop="20dp"
            android:layout_toLeftOf="@+id/inventory_scanned_infobox_wrapper_card">

            ...

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

        <android.support.v7.widget.CardView
            android:id="@+id/inventory_scanned_infobox_wrapper_card"
            android:layout_width="90dp"
            android:layout_height="wrap_content"
            android:layout_alignParentBottom="false"
            android:layout_alignParentRight="true"
            android:layout_alignParentTop="true"
            android:layout_centerVertical="false"
            android:layout_marginRight="20dp"
            android:layout_marginTop="20dp">

            ...

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

    </RelativeLayout>

Left one can grow, so I also wanted the right card to always be the same height as the left one. Usually I do that kind of alignment by setting both layout_alignTop and layout_alignBottom properties to other View but those properties are not available this time, probably because that would create a circular reference (although I don't really understand how horizontal alignment could affect vertical). What to do? I have explored several other options but always get back to the same point except hardcoding heights or setting them programmatically which of course I want to avoid.

Answer 1

Where and why are you getting circular reference errors? Just set

android:layout_alignBottom="@id/inventory_last_scanned_wrapper_card"

on the card at the right side and everything should work.