Toolbar in the wrong location on BottomNavigationView

Question

I'm building an app and when I load the view with the BottomNavigationView, I have odd issues all the time, sometimes, I have an extra space and other times, the toolbar is wrongly located, for example:

With bottom navigation:

Without bottom navigation:

This is my code for the 1st image:

<?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:background="@android:color/white"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
<LinearLayout
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical">    
        <include
            layout="@menu/toolbar_recipe" />
        <FrameLayout
            android:id="@+id/content_frame"
            android:layout_height="0dp"
            android:layout_weight="1"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_width="match_parent" />
    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        app:menu="@menu/bottom_nav_menu"
        app:labelVisibilityMode="unlabeled"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@color/bottom_nav_color"
        app:itemTextColor="@color/bottom_nav_color" />
</LinearLayout>
</RelativeLayout>

Toolbar:

<?xml version="1.0" encoding="UTF-8" ?>
<android.support.v7.widget.Toolbar 
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/toolbar_recipe"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    app:theme="@style/ToolBarStyle"
    android:minHeight="?android:attr/actionBarSize"
    android:background="@color/colorPrimary"/>

And this is how it behaves with the CoordinatorLayout, after I set the paddingTop as ?attr/actionBarSize the FrameLayout moved some space, but it's still wrongly located.

With CoordinatorLayout:

<?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:background="@android:color/white"
    android:layout_width="match_parent"
    android:layout_height="match_parent">
    <android.support.design.widget.CoordinatorLayout
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:fitsSystemWindows="true"
        android:layout_above="@+id/bottom_navigation">
        <include
            layout="@menu/toolbar_recipe" />
        <FrameLayout
            android:id="@+id/content_frame"
            android:paddingTop="?attr/actionBarSize"
            app:layout_behavior="@string/appbar_scrolling_view_behavior"
            android:layout_width="match_parent"
            android:layout_height="match_parent" />
    </android.support.design.widget.CoordinatorLayout>
    <android.support.design.widget.BottomNavigationView
        android:id="@+id/bottom_navigation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_alignParentBottom="true"
        app:menu="@menu/bottom_nav_menu"
        app:labelVisibilityMode="unlabeled"
        app:itemBackground="@color/colorPrimary"
        app:itemIconTint="@color/bottom_nav_color"
        app:itemTextColor="@color/bottom_nav_color" />
</RelativeLayout>

Without that addition, it just stays behind. I'm working in Android 8+, but I don't think it's the issue and I'm out of ideas how to coordinate that situation. Has anyone experienced it?

Thanks for any comment, especially of why it's happening since I cannot understand it.

Answer 1

I found the answer based on this line:

android:fitsSystemWindows="true"

I needed to add it to the root element more or less like this:

<RelativeLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:background="@android:color/white"
    android:layout_width="match_parent"
    android:fitsSystemWindows="true"
    android:layout_height="match_parent">

And here is a description of the property:

System windows are the parts of the screen where the system is drawing either non-interactive (in the case of the status bar) or interactive (in the case of the navigation bar) content.

Most of the time, your app won’t need to draw under the status bar or the navigation bar, but if you do: you need to make sure interactive elements (like buttons) aren’t hidden underneath them. That’s what the default behavior of the android:fitsSystemWindows="true" attribute gives you: it sets the padding of the View to ensure the contents don’t overlay the system windows.

I found it here:

Why would I want to fitsSystemWindows?