Develop Reference

Add elevation to BottomNavigationView

Here's what my bottom navigation bar in XML looks like:
<android.support.design.widget.BottomNavigationView
android:id="#+id/bottom_nav"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:background="#android:color/white"
app:itemBackground="#color/primary"
app:elevation="8dp"
app:menu="#menu/main_activity_bottom_nav"/>
If I remove app:itemBackground="#color/primary", the elevation shows properly, but the moment I add that back in, it disappears.

I think that the problem is not use the app:itemBackground property, but the color that you set as itemBackground.
If I change my app:itemBackground color to white, it works fine, and I can show the shadow above and bottom of the BottomNavigationView. But if I use my primary color (blue), I can see the shadow only on the bottom of my BottomNavigationView.
I think that the easiest way to solve this problem, is create your own shadow and set it above of your BottomNavigationView. It's very simple. This post describes what you have to do.
If you encounter some problems, let a comment below.
I hope that this answer can help you!!
Good luck!!

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"

how to make FloatingActionButtn filled with image?

when I set Image for FloatingActionButton it will be margin at all directions .so I want the ActionButton to be filled with image without any margin.

Use the attribute
android:src="YOUR_DRAWABLE"
in your android.support.design.widget.FloatingActionButton block of XML layout.
Also in you styles.xml, under the style you are using (normally it is AppTheme) use
<item name="colorAccent">#android:color/transparent</item>

I think this is what you want to achieve. Use this code.
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|end"
android:layout_margin="#dimen/fab_margin"
android:fitsSystemWindows="true"
android:cropToPadding="true"
android:background="#android:color/primary_text_dark"
android:src="#drawable/zvam" />
You will get something like this.
http://i.stack.imgur.com/FC4xg.png

Sorry that I do not answer your question directly (I would comment if I could), but I don't think that this is a good idea.
It seems to me that you just want to have a done/check-image on the FAB. If that's the case, you should use the "done" icon from google's material-icons page: https://design.google.com/icons/#ic_done
Also, have a look at google's designguidelines for FABs: https://www.google.com/design/spec/components/buttons-floating-action-button.html.

No ripple on second floating action button in same layout

I have two floating action buttons in one layout file, but only the last one gets the ripple effect applied. If I place them opposite, then it's also the last one getting the ripple. So no matter how they are placed in the layout file, the last one gets a ripple effect on touch and the other does not.
How can this be? Are there any solution to getting the ripple effect on both FABs?
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab_report"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_fab_run"
android:elevation="8dp"
app:backgroundTint="#color/primary"
app:rippleColor="#color/blue" />
<android.support.design.widget.FloatingActionButton
android:id="#+id/fab_run"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_gravity="bottom|right"
android:layout_margin="16dp"
android:clickable="true"
android:src="#drawable/ic_fab_run"
android:elevation="8dp"
app:backgroundTint="#color/primary"
app:rippleColor="#color/blue" />
TL;DR: Only the last one FAB in the layout gets the ripple effect, how to solve this?

I don't know the reason, but adding this attribute solved the problem:
app:theme="#style/Base.Widget.AppCompat.ImageButton"

I had a similar issue - turns out I was implementing a TouchListener for one FAB, and consuming the touch event by returning true from the listener callback. Once I changed this to return false, the FAB ripple effect started working again.

How to add shadow to the FAB provided with the android support design library?

The title is pretty self explaining.
The following code does not render shadow below the Floating Action Button. What can be done to render shadow? Is this feature really not supported even on API 21+?
<android.support.design.widget.FloatingActionButton
android:layout_height="wrap_content"
android:layout_width="wrap_content"
android:src="#drawable/ic_add"
android:clickable="true" />
Note: Adding android:elevation does not add shadow on API 21.
Screenshot taken from the example by dandar3:
https://github.com/dandar3/android-support-design

Simply setting app:borderWidth="0dp" resolve this issues for me.
Note: don't forget to add xmlns:app="http://schemas.android.com/apk/res-auto" to your root layout.
This issue should be fixed in next release of android design library.

For API 21+ you need to set app:borderWidth="0dp" and app:elevation="[number]dp". Setting elevation you are giving the size of shadow that you want:
Here is an example of code for API 21+:
<android.support.design.widget.FloatingActionButton
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/locate_user_FAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/location_off"
app:elevation="6dp"
app:borderWidth="0dp"
android:layout_above="#+id/take_taxi_FAB"
app:backgroundTint="#color/colorAccentGrey">
One important thing to remember for APIs below to 21 (Android 4), is for terms of compatibility FAB will put a margins around your button to draw the shadow. Then you should do something like that (I'm currently using this code and works):
<android.support.design.widget.FloatingActionButton
xmlns:app="http://schemas.android.com/apk/res-auto"
android:id="#+id/locate_user_FAB"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:src="#drawable/location_off"
app:elevation="6dp"
app:borderWidth="0dp"
android:layout_above="#+id/take_taxi_FAB"
android:layout_alignParentRight="true"
android:layout_marginRight="#dimen/map_FAB_marginRight"
android:layout_marginBottom="#dimen/locate_user_FAB_marginBottom"
app:backgroundTint="#color/colorAccentGrey">
I prefer to put xmlns:app="http://schemas.android.com/apk/res-auto" at the beginning of the XML, but I put there just to remind you ;]

I was experiencing this same issue and I got it to work by deleting this tag from my AndroidManifest.xml.
android:hardwareAccelerated="false"
I initially added it, together with android:largeHeap="true", because I thought I needed it for a HeatMap in which a large number of points where shown, but then I realized it could work just with android:largeHeap="true".

If this still isn't working for some, there is a significant difference between:
app:elevation="6dp"
app:borderWidth="0dp"
and
app:borderWidth="0dp"
app:elevation="6dp"
Order seems to matter for some reason (The first order works, second doesn't) and this is from the support library 23.3.0

Check manifest in project or libraries in Application tag and delete them
android:hardwareAccelerated="false"
android:largeHeap="true"
But if you need these options then shadows and transformation animations will not work

In case it help, I was using
android:tint="#color/myColor"
instead of
android:backgroundTint="#color/myColor".
Replacing tint by backgroundTint brought back the shadow.