How to center logo while having no action bar menu

Question

I'm hidding my action bar base on some condition. But when it's hided, the logo inside my toolbar is not center.

How can I fix that ?

    <android.support.design.widget.AppBarLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:theme="@style/AppTheme.AppBarOverlay"
    >

    <android.support.v7.widget.Toolbar
        android:id="@+id/toolbar"
        android:layout_width="match_parent"
        android:layout_height="?attr/actionBarSize"
        android:background="@color/bleuClair"
        app:popupTheme="@style/AppTheme.PopupOverlay"
        app:titleTextColor="@color/colorBlack"
        app:titleMarginStart="0dp">
        <ImageView
            android:padding="3dp"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:layout_gravity="center"
            android:src="@drawable/logo_hd"
            android:contentDescription="@string/remi_logo_desc" />
    </android.support.v7.widget.Toolbar>

</android.support.design.widget.AppBarLayout>

Answer 1

Try This way -

<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:theme="@style/AppTheme.AppBarOverlay">

<android.support.v7.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="?attr/actionBarSize"
    android:background="@color/bleuClair"
    app:popupTheme="@style/AppTheme.PopupOverlay"
    app:titleTextColor="@color/colorBlack"
    app:titleMarginStart="0dp">

<LinearLayout 
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:gravity="center"
    android:orientation="vertical">

    <ImageView
        android:padding="3dp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:src="@drawable/logo_hd"
        android:contentDescription="@string/remi_logo_desc" />

</LinearLayout>
</android.support.v7.widget.Toolbar>