Android Appcompat Toolbar Title not shown correctly - android

I am using support Toolbar from version suppport lib 25.0.1 and randomly it shows like this:
Now this is random and I dont know how to reproduce this. Some times it shows ok some times doesnt show correctly.
This is how I use the Toolbar in my fragment:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
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="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:minHeight="?attr/actionBarSize"
android:theme="#style/Theme.App.Toolbar"
android:elevation="#dimen/toolbar_elevation"
app:layout_scrollFlags="scroll|enterAlways|snap"
app:popupTheme="#style/Theme.App.Toolbar.Popup"/>
<style name="Theme.App.Toolbar">
<item name="android:textColorPrimary">#color/white</item>
<item name="actionMenuTextColor">#color/white</item>
<item name="android:textColorSecondary">#color/white</item>
<item name="android:textColorHint">#color/white</item>
</style>
Fragment:
toolbar.setTitle("Story title");
appCompatActivity().setSupportActionBar(toolbar);
As it can be seen from the screeenshot somehow the toolbar tries to put the subtitle but I dont have one.
Is this happening to other people, is this a known bug for this problem, any solution for this.


Try to use it like:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="#+id/tb_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
android:theme="#style/Theme.MyTheme"
tools:ignore="NewApi">
<TextView
android:id="#+id/tv_title_toolbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:textColor="#android:color/white"
android:textSize="18sp"
/>
</android.support.v7.widget.Toolbar>
Here you can set title gravity to left.
Then access it in the code like this way:
toolbar = (Toolbar) findViewById(R.id.tb_toolbar);
tvToolbarTitle = (TextView) toolbar.findViewById(R.id.tv_title_toolbar);
tvToolbarTitle.setText(title);


The only solution for me until now is to use support library version 25.0.0
Other solutions or updates are welcomed

Related

Change the color of overflow menu icons in a material toolbar

I want to change the overflow menu icons color in my material toolbar depending on the android:theme value.
In this example my search icon is affected by the toolbar's theme via some magic related to the app:actionViewClass attribute implementation, but my info icon is not.
My toolbar:
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.AppBarLayout
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="wrap_content"
android:fitsSystemWindows="true"
app:liftOnScroll="true">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:theme="#style/ThemeOverlay.MaterialComponents.Dark.ActionBar"
style="#style/Widget.MaterialComponents.Toolbar.Primary"
app:title="#string/app_name"
app:menu="#menu/menu_main"
app:layout_scrollFlags="scroll|enterAlways|snap"/>
</com.google.android.material.appbar.AppBarLayout>
My menu:
<?xml version="1.0" encoding="utf-8"?>
<menu
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto">
<item
android:id="#+id/action_search"
android:icon="#drawable/ic_search_24dp"
app:showAsAction="always"
app:actionViewClass="androidx.appcompat.widget.SearchView"
android:title="TODO" />
<item android:id="#+id/action_info"
android:icon="#drawable/ic_info_24dp"
app:showAsAction="always"
android:title="TODO" />
</menu>
Does a simple solution exists?

You can use:
<com.google.android.material.appbar.MaterialToolbar
style="#style/Widget.MaterialComponents.Toolbar.Primary"
android:theme="#style/MyThemeOverlay_Toolbar"
...>
<style name="MyThemeOverlay_Toolbar" parent="ThemeOverlay.MaterialComponents.Toolbar.Primary">
<!-- color used by navigation icon and overflow icon -->
<item name="colorOnPrimary">#color/myColor</item>
</style>

You can head over to the Material Components documentation which has a lot of information about styling each part of views from the library.
In this case it seems like the action icon tint is set by the colorControlNormal attribute.
Documentation - Top app bars

Maybe this answer comes too late, but just in case other people need it, I will post my answer here.
The problem you are facing will be solved if you set the attribute theme to the AppBarLayout instead of the MaterialToolbar.
So, in your code, your toolbar should look like this:
<?xml version="1.0" encoding="utf-8"?>
<com.google.android.material.appbar.AppBarLayout
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="wrap_content"
android:fitsSystemWindows="true"
android:theme="#style/ThemeOverlay.MaterialComponents.Dark.ActionBar"
app:liftOnScroll="true">
<com.google.android.material.appbar.MaterialToolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
style="#style/Widget.MaterialComponents.Toolbar.Primary"
app:title="#string/app_name"
app:menu="#menu/menu_main"
app:layout_scrollFlags="scroll|enterAlways|snap"/>
</com.google.android.material.appbar.AppBarLayout>
Hope this helps to anyone!

No toolbar elevation shadow on Android 9

I'm struggling to make toolbar shadow appear on Android 28+. I tried multiple solutions suggested, but none worked. Following styles work well for all devices below 28:
toolbar.xml
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/toolbar"
style="#style/Widget.App.Toolbar"
android:layout_width="match_parent"
android:background="?attr/colorPrimary"
android:layout_height="?attr/actionBarSize"
/>
styles.xml
<style name="Widget.App.Toolbar.V1" parent="Widget.AppCompat.Toolbar">
<item name="android:layout_height">?attr/actionBarSize</item>
<item name="android:layout_width">match_parent</item>
<item name="android:background">?attr/colorPrimary</item>
<item name="popupTheme">#style/ThemeOverlay.AppCompat.Light</item>
<item name="android:theme">#style/ThemeOverlay.AppCompat.Dark.ActionBar</item>
</style>
styles.xml (v21)
<style name="Widget.App.Toolbar" parent="Widget.App.Toolbar.V1">
<item name="android:elevation">4dp</item>
</style>
I also tried to set elevation programmatically, using ViewCompat.setElevation with no success.
Does anyone has an idea how to make it work?
UPD:
I know you can create custom shadow drawable, but I would like to avoid this solution if possible. Just can't understand why such basic functionality requires additional drawable and views in layout. Also, I wonder why it works on previous Android versions. Didn't found any proofs that this behavior has changed.

I ended up setting my own drop shadow for the toolbar, thought it might helpful for anyone looking for it:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:orientation="vertical">
<android.support.v7.widget.Toolbar android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/color_alizarin"
android:titleTextAppearance="#color/White"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- **** Place Your Content Here **** -->
<View android:layout_width="match_parent"
android:layout_height="5dp"
android:background="#drawable/toolbar_dropshadow"/>
</FrameLayout>
</LinearLayout>
#drawable/toolbar_dropshadow:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#android:color/transparent"
android:endColor="#88333333"
android:angle="90"/>
</shape>
#color/color_alizarin
<color name="color_alizarin">#e74c3c</color>

I don't know why it doesn't work for many of the people, adding:
android:elevation="5dp"
Directly to the toolbar works fine for me.

Support Toolbar title/menu vertical centre

I'm new to android development and I'm working on an app with ActionBar and Tabs. Recently I switched to the new support library Toolbar but the title of the toolbar (ActionBar) isn't vertically centred, while the action buttons are correctly placed.
Title image
The same problem occurs with the first MenuItem in the bar (it's moved up a little bit). Menu image
My activity extends the AppCompatActivty and the layout looks like this:
<?xml version="1.0" encoding="utf-8"?>
<android.support.design.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".MainActivity">
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
android:id="#+id/action_bar_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:minHeight="?attr/actionBarSize"
app:theme="#style/ActionBarTheme"/>
<android.support.design.widget.TabLayout
android:id="#+id/tabs"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/colorPrimary"
app:tabGravity="fill"
app:tabMaxWidth="0dp"
app:tabMode="fixed"/>
<com.myApp.app.views.widgets.ViewPager
android:id="#+id/fragmentPager"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#android:color/white"/>
</android.support.design.widget.AppBarLayout>
</android.support.design.widget.CoordinatorLayout>
and the style:
<style name="ActionBarTheme" parent="Widget.AppCompat.Toolbar">
<item name="android:textColorPrimary">#color/colorPrimaryDark</item>
<item name="colorControlNormal">#color/colorPrimaryDark</item>
<item name="android:background">#color/colorPrimary</item>
</style>
Could someone help me fix this issue? I've searched for a solution but found nothing.
P.S. They were correctly placed as I was using the default action bar

You should use android:theme rather than app:theme here:
android:theme="#style/ActionBarTheme"
Your style should derive from the action bar overlay:
<style name="ActionBarTheme" parent="ThemeOverlay.AppCompat.Dark.ActionBar">
...
</style>
Consider just using the ActionBar theme directly to start to isolate the problem.

Android Toolbar Action button height

I have res/layout/toolbar.xml which is:
<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?actionBarSize"
android:elevation="4dp"
style="#style/ToolbarStyle">
</android.support.v7.widget.Toolbar>
Here is my usage of toolbar:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<include layout="#layout/toolbar" />
<TextView android:text="#string/hello_world" android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
I include it in any Activity Action buttons are shown and work as expected but there is one thing that action button pressed highlight does not fit toolbar
Has anyone faced this kind of problem?
Thank you

It should be a comment, but I it is too long.
It is a material spec.
As you can see in the picture attached, the toolbar height is 64dp in tablet (56dp in smartphone), while the action button height is 48dp.
Also you can check the layout margin enabling in debug menu "show layout margin".
Source:
Here the specs for a smartphone:
If you check the style Widget.AppCompat.ActionButton you will find the minHeight and minWidth specs:
values:
<style name="Base.Widget.AppCompat.ActionButton" parent="">
<item name="android:minWidth">#dimen/abc_action_button_min_width_material</item>
<item name="android:minHeight">#dimen/abc_action_button_min_height_material</item>
</style>
<dimen name="abc_action_button_min_height_material">48dp</dimen>
<dimen name="abc_action_button_min_width_material">48dp</dimen>
values-v21:
<style name="Widget.Material.ActionButton" parent="Widget.ActionButton">
<item name="minWidth">#dimen/action_button_min_width_material</item>
<item name="minHeight">#dimen/action_button_min_height_material</item>
</style>
<dimen name="action_button_min_width_material">48dp</dimen>
<dimen name="action_button_min_height_material">48dp</dimen>

I'm not entirely sure this will solve your problem but try replacing
android:layout_height="?actionBarSize"
with
android:layout_height="?android:attr/actionBarSize"
in toolbar.xml. Again, not entirely sure it will work.

No shadow by default on Toolbar?

I'm updating my app with the new Toolbar from the support library v21. My problem is that the toolbar does not cast any shadow if I don't set the "elevation" attribute. Is that the normal behavior or I'm doing something wrong?
My code is:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_awesome_toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="?attr/colorPrimary"
android:elevation="4dp"
android:minHeight="?attr/actionBarSize"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:popupTheme="#style/ThemeOverlay.AppCompat.Light" />
<FrameLayout
android:id="#+id/FrameLayout1"
android:layout_width="match_parent"
android:layout_height="match_parent">
.
.
.
And in my Activity - OnCreate method:
Toolbar toolbar = (Toolbar) findViewById(R.id.my_awesome_toolbar);
setSupportActionBar(toolbar);

I ended up setting my own drop shadow for the toolbar, thought it might helpful for anyone looking for it:
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="top"
android:orientation="vertical">
<android.support.v7.widget.Toolbar android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/color_alizarin"
android:titleTextAppearance="#color/White"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"/>
<FrameLayout android:layout_width="match_parent"
android:layout_height="match_parent">
<!-- **** Place Your Content Here **** -->
<View android:layout_width="match_parent"
android:layout_height="5dp"
android:background="#drawable/toolbar_dropshadow"/>
</FrameLayout>
</LinearLayout>
#drawable/toolbar_dropshadow:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<gradient android:startColor="#android:color/transparent"
android:endColor="#88333333"
android:angle="90"/>
</shape>
#color/color_alizarin
<color name="color_alizarin">#e74c3c</color>

Google released the Design Support library a few weeks ago and there is a nifty solution for this problem in this library.
Add the Design Support library as a dependency in build.gradle :
compile 'com.android.support:design:22.2.0'
Add AppBarLayout supplied by the library as a wrapper around your Toolbar layout to generate a drop shadow.
<android.support.design.widget.AppBarLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">
<android.support.v7.widget.Toolbar
.../>
</android.support.design.widget.AppBarLayout>
Here is the result :
There are lots of other tricks with the design support library.
http://inthecheesefactory.com/blog/android-design-support-library-codelab/en
http://android-developers.blogspot.in/2015/05/android-design-support-library.html
AndroidX
As above but with dependency:
implementation 'com.google.android.material:material:1.0.0'
and com.google.android.material.appbar.AppBarLayout

You can't use the elevation attribute before API 21 (Android Lollipop). You can however add the shadow programmatically, for example using a custom view placed below the Toolbar.
#layout/toolbar
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/blue"
android:minHeight="?attr/actionBarSize"
app:theme="#style/ThemeOverlay.AppCompat.ActionBar" />
<View
android:id="#+id/toolbar_shadow"
android:layout_width="match_parent"
android:layout_height="3dp"
android:background="#drawable/toolbar_dropshadow" />
#drawable/toolbar_dropshadow
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle">
<gradient
android:startColor="#android:color/transparent"
android:endColor="#88333333"
android:angle="90"/> </shape>
in your activity layout
<include layout="#layout/toolbar" />

Use /values folders to apply the correct shadow style based on OS version.
For under 5.0 devices, use /values/styles.xml to add windowContentOverlay to the body of your activity:
<style name="MyViewArea">
<item name="android:foreground">?android:windowContentOverlay</item>
</style>
<style name="MyToolbar">
<item name="android:background">?attr/colorPrimary</item>
</style>
Then add your own custom shadow by changing your Theme to include:
<item name="android:windowContentOverlay">#drawable/bottom_shadow</item>
You can grab Google's IO app shadow resource here: https://github.com/google/iosched/blob/master/android/src/main/res/drawable-xxhdpi/bottom_shadow.9.png
For 5.0 devices & later, use /values-v21/styles.xml to add elevation to your toolbar using a custom header style:
<style name="MyViewArea">
</style>
<style name="MyToolbar">
<item name="android:background">?attr/colorPrimary</item>
<item name="android:elevation">4dp</item>
</style>
Note that in the second case, I had to create an empty MyViewArea style so the windowContentOverlay wouldn't show up too.
[Update: changed resource names and added Google shadow.]

If you are seting the ToolBar as ActionBar then just call:
getSupportActionBar().setElevation(YOUR_ELEVATION);
Note: This must be called after setSupportActionBar(toolbar);

This worked for me very well:
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/primary"
card_view:cardElevation="4dp"
card_view:cardCornerRadius="0dp">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#color/primary"
android:minHeight="?attr/actionBarSize" />
</android.support.v7.widget.CardView>

i added
<android.support.v7.widget.Toolbar
...
android:translationZ="5dp"/>
in toolbar description and it works for me.
Using 5.0+

My problem is that the toolbar does not cast any shadow if I don't set the "elevation" attribute. Is that the normal behavior or I'm doing something wrong?
That's the normal behavior. Also see the FAQ at the end of this post.

Was toying with this for hours, here's what worked for me.
Remove all the elevation attributes from the appBarLayout and Toolbar widgets (including styles.xml if you are applying any styling).
Now inside activity,apply the elvation on your actionBar:
Toolbar toolbar = (Toolbar)findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
getSupportActionBar().setElevation(3.0f);
This should work.

All you need is a android:margin_bottom equal to the android:elevation value. No AppBarLayout, clipToPadding, etc. required.
Example:
<?xml version="1.0" encoding="utf-8"?>
<androidx.appcompat.widget.Toolbar
xmlns:android="http://schemas.android.com/apk/res/android"
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:layout_marginBottom="4dp"
android:background="#android:color/white"
android:elevation="4dp">
<androidx.constraintlayout.widget.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<!--Inner layout goes here-->
</androidx.constraintlayout.widget.ConstraintLayout>
</androidx.appcompat.widget.Toolbar>

You can also make it work with RelativeLayout. This reduces layout nesting a little bit ;)
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<include
android:id="#+id/toolbar"
layout="#layout/toolbar" />
<FrameLayout
android:id="#+id/container"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="#id/toolbar" />
<View
android:layout_width="match_parent"
android:layout_height="5dp"
android:layout_below="#id/toolbar"
android:background="#drawable/toolbar_shadow" />
</RelativeLayout>

In my situation elevation doesn't work well because I haven't given any background to the toolbar. Try giving background color to the toolbar then set elevation and it will work well.

<androidx.cardview.widget.CardView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginBottom="4dp"
android:elevation="4dp">
<androidx.appcompat.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:buttonGravity="center_vertical" />
</androidx.cardview.widget.CardView>

Most solutions work fine here. Would like to show another, similar alternative :
gradle:
implementation 'androidx.appcompat:appcompat:1.0.0-rc02'
implementation 'com.google.android.material:material:1.0.0-rc02'
implementation 'androidx.core:core-ktx:1.0.0-rc02'
implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
You layout can have a Toolbar View, and a shadow for it, below, similar to this (need modification of course) :
<LinearLayout
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"
android:orientation="vertical">
<android.support.v7.widget.Toolbar
android:id="#+id/toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
android:background="?attr/colorPrimary"
android:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:theme="#style/ThemeOverlay.AppCompat.Dark.ActionBar"
app:titleTextAppearance="#style/Base.TextAppearance.Widget.AppCompat.Toolbar.Title"/>
<include
layout="#layout/toolbar_action_bar_shadow"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
res/drawable-v21/toolbar_action_bar_shadow.xml
<androidx.appcompat.widget.AppCompatImageView
xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
android:layout_height="wrap_content" android:src="#drawable/msl__action_bar_shadow"/>
res/drawable/toolbar_action_bar_shadow.xml
<FrameLayout
xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent" android:layout_height="wrap_content"
android:foreground="?android:windowContentOverlay" tools:ignore="UnusedAttribute"/>
res/drawable/msl__action_bar_shadow.xml
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape
android:dither="true"
android:shape="rectangle" >
<gradient
android:angle="270"
android:endColor="#00000000"
android:startColor="#33000000" />
<size android:height="10dp" />
</shape>
</item>
</layer-list>
styles.xml
<resources>
<style name="AppTheme" parent="Theme.AppCompat.Light.NoActionBar">
<item name="colorPrimary">#color/colorPrimary</item>
<item name="colorPrimaryDark">#color/colorPrimaryDark</item>
<item name="colorAccent">#color/colorAccent</item>
</style>
</resources>
MainActivity.kt
class MainActivity : AppCompatActivity() {
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
setSupportActionBar(toolbar as Toolbar)
}
}
Full sample here, as I've noticed the IDE has a bug of saying foreground attribute is too new to be used here.

The correct answer will be to add
android:backgroundTint="#ff00ff"
to the tool bar
with
android:background="#android:color/white"
If you use other color then white for the background it will remove the shadow.
Nice one Google!

For 5.0 + : You can use AppBarLayout with Toolbar. AppBarLayout has "elevation" attribure.
<android.support.design.widget.AppBarLayout
android:id="#+id/appbar"
android:layout_width="match_parent"
android:elevation="4dp"
android:layout_height="wrap_content"
android:orientation="vertical">
<include layout="#layout/toolbar" />
</android.support.design.widget.AppBarLayout>

actionbar_background.xml
<item>
<shape>
<solid android:color="#color/black" />
<corners android:radius="2dp" />
<gradient
android:startColor="#color/black"
android:centerColor="#color/black"
android:endColor="#color/white"
android:angle="270" />
</shape>
</item>
<item android:bottom="3dp" >
<shape>
<solid android:color="#ffffff" />
<corners android:radius="1dp" />
</shape>
</item>
</layer-list>
add to actionbar_style background
<style name="Theme.ActionBar" parent="style/Widget.AppCompat.Light.ActionBar.Solid">
<item name="background">#drawable/actionbar_background</item>
<item name="android:elevation">0dp</item>
<item name="android:windowContentOverlay">#null</item>
<item name="android:layout_marginBottom">5dp</item>
name="displayOptions">useLogo|showHome|showTitle|showCustom
add to Basetheme
<style name="BaseTheme" parent="Theme.AppCompat.Light">
<item name="android:homeAsUpIndicator">#drawable/home_back</item>
<item name="actionBarStyle">#style/Theme.ActionBar</item>
</style>

I had similar problem with the shadow. The shadow is drawn by direct parent of AppBarLayout in my case. If height of the parent is the same as AppBarLayout's the shadow cannot be drawn. So checking size of the parent layout and maybe layout remake can solve the problem. https://www.reddit.com/r/androiddev/comments/6xddb0/having_a_toolbar_as_a_fragment_the_shadow/

I am posting this because this took me hours to find so i hope it may help someone.
I had a problem that the shadow/elevation was not showing though i created a simple activity and placed the toolbar as follows:
<androidx.appcompat.widget.Toolbar
android:id="#+id/mt_toolbar"
android:layout_width="match_parent"
android:layout_height="?attr/actionBarSize"
app:layout_collapseMode="pin"
android:background="#color/colorPrimaryDark"
android:elevation="12dp"/>
It turns out that in the manifest
setting android:hardwareAccelerated="false" was causing it! once i removed it, the shadow appeared

Just put background
<androidx.appcompat.widget.Toolbar
android:layout_width="match_parent"
android:elevation="8dp"
android:background="#fff"
android:layout_height="?android:attr/actionBarSize"></androidx.appcompat.widget.Toolbar>

You need to use background color and elevation togather.
<com.google.android.material.appbar.MaterialToolbar
app:elevation="8dp"
android:elevation="8dp"
android:background="#color/white"/>

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