Anchor an floating button on a cardview

Question

I try to anchor an floating button on a cardview without success.

<?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="wrap_content"
    android:orientation="vertical">


    <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginBottom="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginTop="8dp"
        android:background="@android:color/white"
        card_view:cardCornerRadius="2dp"
        card_view:cardElevation="2dp">


            ..... my view ...


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

    <android.support.design.widget.FloatingActionButton
        xmlns:app="http://schemas.android.com/apk/res-auto"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        app:layout_anchor="@id/card_view"
        app:layout_anchorGravity="bottom|end|right"
        android:layout_margin="16dp"
        android:clickable="true"/>

</LinearLayout>

The result is like this :

I want that floating button appear like the green circle. This layout is used in RecyclerView

Is it a way to achieve this ?

Answer 1

Can you add below code your floating button

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:id="@+id/activity_main"
android:layout_width="match_parent"
android:layout_height="match_parent"

>

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="200dp"
    android:orientation="vertical"
    android:layout_alignParentBottom="true"
    android:layout_alignParentLeft="true"
    android:layout_alignParentStart="true"
    android:layout_marginBottom="297dp"
    android:id="@+id/relativeLayout">


    <android.support.v7.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="fill_parent"
        android:layout_marginBottom="4dp"
        android:layout_marginLeft="4dp"
        android:layout_marginRight="4dp"
        android:layout_marginTop="8dp"

        android:background="@android:color/white"
        card_view:cardCornerRadius="2dp"
        card_view:cardElevation="2dp">


        ..... my view ...


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

</RelativeLayout>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom|end"
    app:srcCompat="@android:drawable/ic_dialog_email"
    android:layout_marginRight="12dp"
    android:layout_marginEnd="12dp"
    android:layout_marginTop="165dp"
    android:layout_alignTop="@+id/relativeLayout"
    android:layout_alignParentRight="true"
    android:layout_alignParentEnd="true" />