Develop Reference

Material Button won't cast white elevation shadow on Android 11

I have a Material Button (from Google's Material Components) which can cast black shadow normally. But when I change the shadow color, it won't appear at all. Here's the button's XML portion :
<com.google.android.material.button.MaterialButton
android:id="#+id/next"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="#dimen/margin_activity_horizontal"
android:enabled="false"
android:elevation="8dp"
android:layout_margin="16dp"
android:text="#string/setup_next"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintTop_toBottomOf="#id/nickname_entry_wrapper"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
tools:enabled="true"
android:textSize="18sp"
android:textColor="#000000"
android:backgroundTint="#FFFFFF"
android:fontFamily="#font/poppins_semibold"
android:paddingVertical="12dp"
android:outlineAmbientShadowColor="#FFFFFFFF"
android:outlineSpotShadowColor="#FFFFFFFF"
android:outlineProvider="background"
android:translationZ="8dp"
/>
As you can see, outlineAmbientShadowColor and outlineSpotShadowColor are supposed to change the shadow color that results from elevation and Z translation, right ? I tried adding both elevation and Z translation at once but nothing works, the button still has 0 shadow.
The button is a child view of a Constraint Layout that has a black background. As you can see, I even tried using different values for outlineProvider such as bounds or paddedBounds, yet..nothing.
If anyone has experience with these outline attributes, I'd love to have this solved. The problem isn't specific to Android 11 only, I am just saying that I am using Android 11 for testing, since those outline attributes are only available on Android versions later than Oreo.

As Mike M. has mentioned in the comment, those attributes don't really change the color, they just add a little 'tint'.
If you wanna use material buttons with more features, you should take a look at this library :
Github Repo: Carbon by ZieIony
It should fulfill the required objective (casting white shadows) successfully and without issues on all Android APIs.

How to highlight a TextView when you click on it just like when you click on a Button

By default, when you click on a Button, it will get highlighted. How to do the same thing for TextView when the user click on it?

You should be able to set this in the xml layout file, by setting the view clickable and setting the foreground property correctly.
For example:
...
<TextView
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:foreground="?attr/selectableItemBackground"
android:clickable="true"
android:focusable="true"
/>
...
Just a note, foreground is only available in Android API version 23 or above. If you need to use it in a version below that, replace android:foreground with android:background. Not exactly the same behaviour (ripple effect is placed in the background of the text, instead of in a layer above of the view as the property name indicates), but it should do the trick.

How can I set ripples (android:foreground="?selectableItemBackground") in a constraint.Group

I have a contraint.Group inside my item_layout that I will use it in a recyclerView:
<android.support.constraint.Group
android:id="#+id/constraintGroup"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
app:constraint_referenced_ids="imageView, textView" />
I also set the onClickListener for this group in the activity that works perfectly. The problem is that every time I tap on the group, the ripple effect isn't there.
Anyone knows what should I do to have that effect in a constraint.Group?
I tried adding the attribute android:foreground="?selectableItemBackground" to the parent and the constraint.Group but it didn't work :(

A Group is only for controlling visibility. You cannot control arbitrary UI attributes of the members of a group, such as the background. Instead, you would need to put your background on the actual widgets.

You can try using androidx.constraintLayout.widget.Group. It is an updated version of android.support.constraint.Group.
The following code adds the ripple effect
android:clickable="true"
android:focusable="true"
android:background="?attr/selectableItemBackground"

Android button elevation shadow not working

I am trying to make a button that has a shadow using elevation with a background image being my sign in with gmail png. The button is contained within a relative layout. The elevation won't show no matter what I try to do. I tried solutions from other forum questions and none worked.
Here is my code for the button
<Button
android:id="#+id/google"
android:layout_width="270dp"
android:layout_height="38dp"
android:layout_marginTop="30dp"
android:layout_centerHorizontal="true"
android:background="#drawable/google"
android:elevation="10dp"
android:layout_below="#id/slogan"/>
The google drawable is a png image that I exported from Adobe XD.
Could someone please give me a pointer on what I am doing wrong? Thanks.
Additionally, I realize that if I set the background of the button to android:color/white the shadow appears. So I think the issue is with the png drawable? Does elevation not work with png images? Is there a workaround?

Use below the line of code to show an elevation in button
android:outlineProvider="bounds" – K. Sopheak
That works, thanks!

try this I hope it helps, because another view or layout just after your button is hiding shadow
android:layout_marginBottom="16dp"

For Material Button, I tried the following and it worked
android:translationZ="5dp"

Since you're using an image, replace the <Button> tag with that of an <ImageButton>. So, your workaround code would be:
<ImageButton
android:id="#+id/google"
android:layout_width="270dp"
android:layout_height="38dp"
android:layout_marginTop="30dp"
android:layout_centerHorizontal="true"
android:src="#drawable/google"
android:elevation="10dp"
android:layout_below="#id/slogan"/>
Take note that the android:src attribute is being used here rather than the android:background attribute.
This one worked for me!

try this , I hope this help you ||
android:layout_margin="5dp"

Android 5.0 - ProgressBar cannot be displayed over a Button

I think the title is pretty explicit about my problem... So here is my layout :
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/button_action"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login" />
<ProgressBar
android:id="#+id/progress_bar"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_centerInParent="true"/>
</RelativeLayout>
On android SDKs < 21, no problem, the ProgressBar is correctly displayed over the Button and centered in the Button. But on Android 5.0, the ProgressBar is displayed behind the Button.
So you can see it's correctly positionned it when you activate the option "Show layout bounds" in Developer Options settings, but you can't see anything on the screen without that option.
Would anybody know how to fix this? I guess it's a matter of elevation recently introduced, but I really don't know how to take care of it.
For the record, I'm using the recently released Theme.AppCompat style from the support.v7.
EDIT:
I also tried to apply setElevation(0) and setTranslationY(0) to the Button programmatically but it didn't change anything. So I wonder if it has to deal with the elevation.

You can add the android:translationZ attribute to the ProgressBar:
<ProgressBar
android:id="#+id/progress_bar"
android:layout_width="50dp"
android:layout_height="50dp"
android:translationZ="2dp"
android:layout_centerInParent="true"/>

Same issue here, my simple "hack" was too wrap the Button into another FrameLayout.
This way I don't care about the api version and other elevation issue ;)
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="center" >
<FrameLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content">
<Button
android:id="#+id/button_action"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:text="Login" />
</FrameLayout>
<ProgressBar
android:id="#+id/progress_bar"
android:layout_width="50dp"
android:layout_height="50dp" />
</FrameLayout>

Same question being asked here, with a better explanation of the issue:
https://stackoverflow.com/a/27216368/235910
To quote #CommonsWare:
The problem appears Android 5.0's elevation property. Apparently,
the RelativeLayout Z-axis ordering is tied into elevation. If both
widgets have the same elevation, the RelativeLayout will determine
the Z-axis order -- you can see that if you were to switch your layout
to be both Button widgets, for example. However, if one widget
(Button) has an elevation, and another widget (ImageView) does
not, the elevation will take precedence.
You can remove the Button elevation via
android:stateListAnimator="#null" or by defining your own custom
animator. Or, you can add some elevation to your ImageView to
get it to be higher on the Z axis than is the Button.

It is better to set android:translationZ more than 2dp. Your view/widget will disappear when you press the button. I explained the reason here.
<!-- Elevation when button is pressed -->
<dimen name="button_elevation_material">1dp</dimen>
<!-- Z translation to apply when button is pressed -->
<dimen name="button_pressed_z_material">2dp</dimen>
Button have these two values and defined in the framework.

If you add 'androidx.core:core' to your build.gradle, you can use this code for API < 21:
ViewCompat.setTranslationZ(viewToElevate, 5);

By default, if you want to show a view on top of a Button, it should have an elevation of at least 2dp.
This is caused by the fact that the elevation of a button is governed by their stateListAnimator. So long as it has one, setting the elevation to the button itself doesn't do anything. The stateListAnimator of Widget.MaterialComponents.Button has a default elevation of #dimen/mtrl_btn_elevation (2dp), so that's the elevation you have to take into account.
Doing android:stateListAnimator="#null" will also work, but that will get rid of any shadow effects at the button.