Collapsing AppBar with two Toolbars

I am trying to create an app with two toolbars on top and a specific collapsing/expanding behaviour on scrolling. See the mockup to get a deeper understanding of what I'm trying to achieve:

I found this StackOverflow question that is trying to achieve for about the same, and the response is hinting towards using a CollapsingToolbarLayout and just using another Toolbar instead of the usual ImageView, but I tried around and could not get any close to the desired result. I am also not sure if there are better approaches to achieve this.

My current XML layout looks as follows:

    <androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:id="@+id/mainContainer"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:fitsSystemWindows="true"
    tools:context=".MainActivity">

    <com.google.android.material.appbar.AppBarLayout
        android:id="@+id/appbar"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">

        <com.google.android.material.appbar.CollapsingToolbarLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:layout_scrollFlags="scroll|exitUntilCollapsed">

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/secondaryToolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:title="01/01/1999"
                app:layout_collapseMode="parallax" />

            <androidx.appcompat.widget.Toolbar
                android:id="@+id/primaryToolbar"
                android:layout_width="match_parent"
                android:layout_height="?attr/actionBarSize"
                app:title="Title"
                app:layout_collapseMode="pin" />

        </com.google.android.material.appbar.CollapsingToolbarLayout>

    </com.google.android.material.appbar.AppBarLayout>

    <androidx.core.widget.NestedScrollView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:layout_behavior="@string/appbar_scrolling_view_behavior">

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="@string/placeholder"/>

    </androidx.core.widget.NestedScrollView>

</androidx.coordinatorlayout.widget.CoordinatorLayout>`

And the corresponding activity code:

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    Toolbar toolbar = findViewById(R.id.primaryToolbar);
    setSupportActionBar(toolbar);
}

I am using a NoActionBar theme. If I run this configuration, there is just one Toolbar displayed, nothing can be seen from the second Toolbar or the CollapsingToolbarLayout.

Huge thanks to anyone who is trying to help.

posted about 2 years ago

CC BY-SA 4.0

BenjyTec‭

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