setting minHeight in CollapsingToolbarLayout not having any effect

Question

The main problem I've currently got with the CollapsingToolbarLayout is, that whatever I'm trying, the minHeight attribute of my Toolbar does not have any effect.

My desired result would be this: (The CollapsingToolbarLayout with a certain expanded height and a certain collapsed height (in the example 180dp), while the title either collapses or stays on the top)

But whatever I do, the title sometimes is in the center, won't completely collapse or the minHeight is ignored anyway. I have tried to set the minHeight for either AppBarLayout, CollapsingToolbarLayout, the toolbar itself, any contents, etc. also with different approaches found on the web but with no luck.

Here is the basic xml:

<android.support.design.widget.AppBarLayout
        android:id="@+id/app_bar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:fitsSystemWindows="true"
        android:minHeight="180dp">

        <android.support.design.widget.CollapsingToolbarLayout
            android:id="@+id/collapsing_toolbar"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:fitsSystemWindows="true"
            app:contentScrim="@android:color/transparent"
            app:expandedTitleGravity="bottom"
            app:expandedTitleTextAppearance="@style/TextAppearence.App.ToolbarTitle"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:statusBarScrim="@android:color/transparent">

            <com.xxxxxx.custom.Banner
                android:id="@+id/parallax_image"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_gravity="center"
                android:adjustViewBounds="true"
                android:fitsSystemWindows="true"
                android:scaleType="centerCrop"
                android:src="@drawable/xxxxxxxx"
                app:layout_collapseMode="parallax"
                app:layout_collapseParallaxMultiplier="0.6"
                app:layout_scrollFlags="scroll" />

            <android.support.v7.widget.Toolbar
                android:id="@+id/toolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                android:minHeight="180dp"
                app:layout_collapseMode="pin" />

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

I hope this is enough content to explain my problem. Any help is appreciated, thanks!

Answer 1

This one is pretty easy. Just set bottom margin of your Toolbar to whatever space you want to be reserved in the collapsed version.

The reasoning behind this is simple. CollapsingToolbarLayout inherits from FrameLayout which stacks images on top of each other. The only things it takes in account when considering collapsed bounds are toolbar height and its top / bottom margins.

Answer 2

You can set the height to 180dp instead of using minHeight, and then add a TextView into the toolbar to serve as the title.

Answer 3

just set Toolbar collapseMode as "pin" mode, and height with your requirement size

 <androidx.appcompat.widget.Toolbar
    android:id="@+id/toolbar"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    app:layout_collapseMode="pin"
    app:popupTheme="@style/ThemeOverlay.AppCompat.Light"/>