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.

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"

Preventing material button from raising in Android

As you know, buttons in API+21 raise when you touch them. According to the documentation, you should not place such buttons in dialogs or other raised interfaces. I have tried setting elevation to 0 or 1 but to no avail. I just want the button to have the ripple effect without raising.
How can I do that?
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:elevation="0dp"
android:clickable="true"/>

Referring to his answer here: https://stackoverflow.com/a/31003693/3090173. It says to set the button's stateListAnimator to null via the xml attribute.
<Button
....
android:stateListAnimator="#null"
.... />
You can also set a custom drawable as the background to get rid of the elevation.

Make borderless image button small on Android

There is some closeable view in my app and it has a close button in header. I want make this button borderless and small.The code:
<ImageButton
android:layout_width="wrap_content"
android:layout_height="wrap_content"
style="?android:attr/borderlessButtonStyle"
android:layout_margin="0dp"
android:padding="0dp"
android:src="#android:drawable/ic_menu_close_clear_cancel"/>
In result the button is borderless but has much empty place around cross image (button is hitted on screenshot to make empty space visible)
How could I fix it?

You should use:
android:background="?selectableItemBackgroundBorderless"

Added
android:minHeight="0dp"
android:minWidth="0dp"
android:padding="2dp"
The result
Also I'll use negative margins to place the button closer to corner.

You can use the following on your ImageButton to remove the 'border':
android:background="#android:color/transparent"
or
android:background="#null"
If you would like change the background when the user clicks the button you can create a selector. Example ImageButton doesn't highlight on click with Transparent background.

With the introduction of ConstraintLayout, you can use constraints to reduce the width of the borderless ImageButton, that's way too wide by default, by constraining it to be as wide as the height:
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/my_closeable_view"
android:layout_width="match_parent"
android:layout_height="match_parent">
<ImageButton
style="?android:attr/borderlessButtonStyle"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:contentDescription="#string/action_close"
android:src="#android:drawable/ic_menu_close_clear_cancel"
app:layout_constraintDimensionRatio="w,1:1"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
I don't recommend you to make it any smaller than this because the touch target needs to be at least 48dp x 48dp, as for Google's Material Design guidelines, otherwise a user would have a hard time trying to touch it.
If you really need it to look like it's closer to the edges of the view, you can always use an image that's not centered (has transparent padding on one or two sides), but I'd try my best to avoid doing this workaround and try rethinking my app's design in order to accommodate the button as it is.

use textView for that..
and use textview.OnTouchListener
finally onTouch change the color of text.. thats it
or else in your code just use
android:background="#null"

Elevation on Android Lollipop not working

I am trying to make use of the elevation property in the latest Android Lollipop preview release. I set the targetSdk to 21 and the theme to Material. Next i added a background shape to a TextView and set the elevation to 8dp but the TextView is not showing any signs of a shadow. That is on a Nexus7 running the Lollipop preview. Is there anything else i have to consider?
Here is the layout:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<TextView
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:background="#drawable/rect"
android:text="hallo world"
android:padding="8dp"
android:elevation="8dp" />
</LinearLayout>
This is the background drawable:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#7d0073ff" />
<corners android:radius="16dp" />
</shape>
Here is the TextView:

For some reason if you set a solid color with a transparency, the elevation shadow does not show up.
In your example, I changed #7d0073ff to #0073ff and I got a shadow.
This is probably a bug, as in their documentation it gives a similar example using a translucent background color.

After going through the docs again, I finally found the solution.
Just add card_view:cardUseCompatPadding="true" to your CardView and shadows will appear on Lollipop devices.
What happens is, the content area in a CardView take different sizes on pre-lollipop and lollipop devices. So in lollipop devices the shadow is actually covered by the card so its not visible. By adding this attribute the content area remains the same across all devices and the shadow becomes visible.
My xml code is like :
<android.support.v7.widget.CardView
android:id="#+id/media_card_view"
android:layout_width="match_parent"
android:layout_height="130dp"
card_view:cardBackgroundColor="#android:color/white"
card_view:cardElevation="2sp"
card_view:cardUseCompatPadding="true"
>
...
</android.support.v7.widget.CardView>

ADDING android:elevation shadow to an ImageView:
android:clipToPadding="false"
+
android:outlineProvider="bounds"
+
android:elevation="2dp"

I was also having this problem, and as it turns out, you need to turn hardware acceleration on in the android manifest
<application
...
android:hardwareAccelerated="true">

be aware, if you have the following line in the manifest then shadows wont show:
android:hardwareAccelerated="false"

TL;DR
Check your card: (or whatever word you use) namespace declaration and make sure it matches this: xmlns:card="http://schemas.android.com/apk/res-auto"
I know there are a few answers here already, but I wanted to add mine as it wasn't included in these current suggestions. In order to get the shadows working on both KitKat and Marshmallow, (only emulators I tried, I'm sure it works in between) I added the following xml attributes to my card:
card:cardElevation="25dp"
card:cardUseCompatPadding="true"
After banging my head against my desk for why that wasn't working, trying to set the background color of the card to something completely opaque, enabling hardware acceleration in the manifest, and even praying, I checked the namespace declarations in my file. To my horror, I saw that the card xml namespace had been assigned to the following:
xmlns:card="http://schemas.android.com/tools"
After fixing that namespace declaration, I ran my dummy app again and let out a sigh of relief as shadows were finally being shown as expected.
Here is proof in case you're a doubter like me. And please Google, Android, whoever: Make shadows great again. They shouldn't be this difficult.
Here is the entire file that created the layout pictured below:
<?xml version="1.0" encoding="utf-8"?>
<!--MAKE SURE YOU HAVE THE RIGHT XML NAMESPACE ASSIGNED-->
<!--TO WHATEVER WORD YOU PUT IN FRONT OF THE CARD-->
<!--XML ATTRIBUTES. IN THIS CASE, MINE IS card-->
<android.support.percent.PercentRelativeLayout
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:card="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:background="#607D8B"
android:fitsSystemWindows="true"
tools:context="com.mlustig.playground.MainActivity">
<android.support.v7.widget.CardView
android:layout_width="100dp"
android:layout_height="100dp"
android:layout_centerInParent="true"
app:layout_aspectRatio="66%"
app:layout_heightPercent="75%"
card:cardElevation="25dp"
card:cardUseCompatPadding="true" />
</android.support.percent.PercentRelativeLayout>
Yes, I know. It's annoying that you can't simply copy and paste this layout and run it because it has PercentRelativeLayout in it, but I left it there on purpose. You should definitely check it out. Super powerful, very useful. Nice nice nice. Hope this helped.

As noted earlier, this is an open bug in Android : if the background drawable uses a solid color with transparency, then the shadow won't be shown.
To work around the issue, display the background in its own separate view and set the alpha on that view. Wrap the background view and the TextView in a RelativeLayout to place the background directly under the TextView and use android:layout_alignLeft, android:layout_alignBottom etc to make it the same size. They need to be at the same elevation, and the background must appear before the TextView in the xml so it is drawn under it.
<RelativeLayout
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:paddingLeft="40dp"
android:paddingRight="40dp"
android:paddingTop="20dp"
android:paddingBottom="20dp"
android:clipToPadding="false"
android:background="#ffffff">
<View
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="#+id/text_view"
android:layout_alignRight="#id/text_view"
android:layout_alignBottom="#id/text_view"
android:layout_alignTop="#id/text_view"
android:background="#drawable/rect"
android:alpha="0.5"
android:elevation="8dp"/>
<TextView
android:id="#id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="hallo world"
android:textColor="#ffffff"
android:padding="8dp"
android:elevation="8dp" />
</RelativeLayout>
The drawable is the same as yours but without transparency:
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#0073ff" />
<corners android:radius="16dp" />
</shape>
Result:
A few notable points:
You must ensure that the enclosing RelativeLayout is large enough to display the shadow. If you just set its dimensions to wrap_content without padding, the shadow will be clipped to the layout's bounds. As explained in this question, you can use padding and set android:cipToPadding="false" to make it large enough for the shadow. You might not need as much padding in this case, I haven't experimented with that.
In this case we need to use a separate view for the background because if we had set the alpha directly on the TextView then the text would have been affected as well. Depending on your use case you might not need a separate view and enclosing layout and could just just have one view, with alpha set on the view and no transparency in the drawable.

Try using : app:cardElevation="4dp"

Try adding margin to the CardView.