SubtitleCollapsingToolbarLayout

Standard CollapsingToolbarLayout with subtitle support.

• Just like the title, subtitle text will have to be 1 line.
• When collapsed, a subtitle would still appear as Toolbar's.
• Separate configuration for title and subtitle: text color, gravity, etc.

Caveats

Since it uses a lot of CollapsingToolbarLayout resources and API, there are a few:

• Only safe to use with the same version of material components.
• Deceptive package name.

Also...

It is detabable if we even need this library. If the material guidelines says it's ok to have a multiline text in toolbar layout, then they surely would've already implemented such feature. If it doesn't say anything about subtitle (which is odds because Toolbar has it), then we probably shouldn't use it out of respect to the guidelines.

Download

This library follows AndroidX's revisions.

repositories {
    mavenCentral()
    google()
}

dependencies {
    implementation "com.google.android.material:material:$version"
    implementation "com.hendraanggrian.material:collapsingtoolbarlayout-subtitle:$version"
}

Snapshots of the development version are available in Sonatype's snapshots repository.

Usage

Treat SubtitleCollapsingToolbarLayout just like a regular CollapsingToolbarLayout.

<androidx.coordinatorlayout.widget.CoordinatorLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

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

        <com.google.android.material.appbar.SubtitleCollapsingToolbarLayout
            android:id="@+id/subtitlecollapsingtoolbarlayout"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            app:contentScrim="?colorPrimary"
            app:layout_scrollFlags="scroll|exitUntilCollapsed"
            app:subtitle="Papua, Indonesia"
            app:title="Raja Ampat">

            <!-- collapsing toolbar content goes here -->

            <androidx.appcompat.widget.Toolbar
                android:layout_width="match_parent"
                android:layout_height="?actionBarSize"
                app:layout_collapseMode="pin"/>
        </android.support.design.widget.SubtitleCollapsingToolbarLayout>
    </com.google.android.material.appbar.AppBarLayout>

    <!-- content goes here -->

</androidx.coordinatorlayout.widget.CoordinatorLayout>

Attributes

SubtitleCollapsingToolbarLayout has all the attributes of CollapsingToolbarLayout, and a few extras.

Attribute	Description	Default value/behavior
subtitle	subtitle text	disabled
collapsedSubtitleTextAppearance	text appearance of subtitle when collapsed	TextAppearance.AppCompat.Widget.ActionBar.Subtitle
expandedSubtitleTextAppearance	text appearance of subtitle when expanded	TextAppearance.AppCompat.Headline