Buttons added underneath Reciclerview do not appear

Question

I’m using a Linearlayout with a Reciclerview and 3 buttons underneath it.

I’m doing this, but Reciclerview takes up the whole screen and the buttons don’t appear.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/salmao"
    tools:context="br.com.robson.boascompras.ListasComprasActivity">

    <android.support.v7.widget.RecyclerView
            android:id="@+id/my_recycler_view"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/editar"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/excluir"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/nova_lista"/>
    </LinearLayout>
</LinearLayout>

Answer 1

Can’t use android:layout_height="wrap_content", in a Recyclerview or Listview, when the number of items exceeds the screen size.

wrap_content means "make me big enough to present all my content".
When the space required is larger than the screen, Recyclerview takes it all in, "pushing" everything under it out of the screen.

Change android:layout_height="wrap_content" for android:layout_height="0p" and weigh it down with android:layout_weight:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:background="@color/salmao"
    tools:context="br.com.robson.boascompras.ListasComprasActivity">

    <android.support.v7.widget.RecyclerView
            android:id="@+id/my_recycler_view"
            android:scrollbars="vertical"
            android:layout_width="match_parent"
            android:layout_height="0dp"
            android:layout_weight="1"/>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal"
        android:gravity="center">
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/editar"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/excluir"/>
        <Button
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/nova_lista"/>
    </LinearLayout>
</LinearLayout>