Bottom Align Floating Action Button

Question

I want to align to bottom right my FAB.

1. I tried with android:gravity="bottom|right"
2. When I try android:layout_alignParentBottom="true" FAB disappears
3. When I try android:layout_alignBottom="@id/lista_tiendas" FAB disappears

It doesn't seem complicated but I just can't accomplish it

Any Ideas?

<?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"
android:layout_width="match_parent"
android:layout_height="match_parent">

<ListView
    android:id="@+id/lista_tiendas"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_margin="5dp"
    android:divider="@android:color/transparent"
    android:dividerHeight="4.0sp"/>

<android.support.design.widget.FloatingActionButton
    android:id="@+id/fab"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:src="@drawable/ic_add_white_48dp"
    app:backgroundTint="@color/spg_rosa"
    app:borderWidth="0dp"
    app:elevation="8dp"
    app:fabSize="normal"
    android:layout_alignParentRight="true"
    android:layout_alignParentBottom="@id/lista_tiendas"
     />
</RelativeLayout>

Answer 1

For RelativeLayout:

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    ... />

---

For CoordinatorLayout, you should use android:layout_gravity="end|bottom"

---

For ConstraintLayout:

<com.google.android.material.floatingactionbutton.FloatingActionButton
    android:id="@+id/fab"
    app:layout_constraintBottom_toBottomOf="parent"
    app:layout_constraintEnd_toEndOf="parent"
    ... />

---

See this answer for more information.