Android - Unwanted space underneath ActionBar

Question

I use a MainActivity with a container for my fragments. The MainActivitie's XML contains a toolbar with the following code:

<android.support.v7.widget.Toolbar
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:background="@color/c_green"
    android:id="@+id/toolbar"
    android:theme="@style/ThemeOverlay.AppCompat.Dark.ActionBar"
    app:title="@string/app_name"
    android:contentInsetLeft="10dp"
    android:contentInsetStart="10dp"
    app:contentInsetLeft="10dp"
    android:layout_margin="0dp"
    android:padding="0dp">
    <ImageView
        android:id="@+id/logo"
        android:layout_width="100dp"
        android:layout_height="35dp"
        android:layout_gravity="left" />
</android.support.v7.widget.Toolbar>

The problem is the following: On all my fragments I have this unwanted extra space underneath the ActionBar as can be seen in the picture.

When on a recyclerView you can see the CardViews slide underneath the whitespace. I guess there is something wrong with the ActionBar. I tried to add padding 0dp and margin 0dp, but none of that changed anything.

Thanks in advance!

Answer 1

I have found that instead of using

android:layout_marginTop="?attr/actionBarSize"

in my fragments, using

android:layout_marginTop="@dimen/myActionBar_height"

with

    <dimen name="myActionBar_height">48dp</dimen>

fixed the extra space. However I don't find this a good solution.

The problem seems to be an extra 10dp of margin top.