How to implement a rounded Button with gradient background and blurred shadow? - android

I am trying to achieve something like this.
https://i.stack.imgur.com/SseaB.png
For default Button/AppCompatButton, i had tried to apply gradient background with rounded corners that was predefined in xml drawable. But how to implement shadow with blur?


Create a drawable class bg_theme_round_layer_shadow
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android"
>
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#02AAAAAA" />
<corners android:radius="46.5dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#05AAAAAA" />
<corners android:radius="46dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#0FAAAAAA" />
<corners android:radius="45.5dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#1CAAAAAA" />
<corners android:radius="44.5dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#24AAAAAA" />
<corners android:radius="43.5dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<!--<solid android:color="#color/theme_color" />-->
<gradient android:endColor="#color/gradient_normal_end" android:startColor="#color/gradient_normal_start"/>
<corners android:radius="43dp" />
</shape>
</item>
</layer-list>
Put these colors in your color file
<color name="gradient_normal_start">#e85d7b</color>
<color name="gradient_normal_end">#efa645</color>

Related

Android: box shadow and border radius layout

I want box shadow and radius like below image, but in android box shadow not work
How can i use xml for this problem ?

for corner you have to use drawable like below:
<shape
xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle"
>
<!-- view border color and width -->
<stroke
android:width="1dip"
android:color="#a4a2a2" >
</stroke>
<corners android:radius="180px">
</corners>
<!-- Here is the corner radius -->
and about shadow
i think you mean android:elevation="8dp"
<Yourbox
android:width="match_parent"
android:height="match_parent"
....
android:elevation="8dp"
android:layout_gravity="center"
..
/>

You can set this shape as background of any views
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Drop Shadow Stack -->
<item>
<shape>
<corners android:radius="4dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="4dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="4dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20d5d5d5" />
</shape>
</item>
<item>
<shape>
<corners android:radius="6dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#30cbcbcb" />
</shape>
</item>
<item>
<shape>
<corners android:radius="4dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#50bababa" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="#color/gray_100" />
<corners android:radius="4dp" />
</shape>
</item>
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<androidx.cardview.widget.CardView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="270dp"
android:layout_height="130dp"
android:layout_margin="15dp"
android:translationZ="4dp"
app:cardCornerRadius="6dp"
app:cardElevation="0dp">
.....
</androidx.cardview.widget.CardView>
just use translationZ

Circular button with shadow like 5.0 FAB

I want a button in circular shape with shadow. Shadow must be like FAB. Currently I'm using a png to implement the button.
But when I use this image I can't give correct pressed state changes.
Is there any way to impleament this by using xml

you can try it
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Drop Shadow Stack -->
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#30CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#50CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape android:shape="oval">
<solid android:color="#android:color/white" />
<corners android:radius="3dp" />
</shape>
</item>
</layer-list>
<Button
android:id="#+id/btn"
android:layout_width="80dp"
android:layout_height="80dp"
android:layout_centerInParent="true"
android:background="#drawable/shadow_circle"
android:text="0"
android:textColor="#fff" />

Create circle.xml under drawable folder
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="oval">
<solid android:color="#03ae3c"/>
</shape>
set this as background for layout or view. then assign elevation attribute to your view. that will give you visual appearance of its shadow.
<LinearLayout
android:layout_width="250dp"
android:layout_height="250dp"
android:background="#drawable/circle"
android:elevation="14dp"
android:orientation="vertical"/>

First, you create a file name round_shape.xml in layout folder with content as
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="oval">
<size android:width="100dp"
android:height="100dp"/>
<solid android:color="#59d5fe"/>
</shape>
</item>
</selector>
Then in your activity_main.xml (where you want to put the button) adds the code
<Button
android:id="#+id/button1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_centerHorizontal="true"
android:layout_centerVertical="true"
android:background="#layout/round_shape"
android:textColor="#f8fdf9" />

Following code will help to design different size and shape or colorfull control in android used following code
<shape xmlns:android="http://schemas.android.com/apk/res/android" android:shape="rectangle" > <corners android:radius="14dp"/>
<gradient android:angle="45"
android:centerX="35%"
android:centerColor="#7995A8"
android:startColor="#E8E8E8"
android:endColor="#000000"
android:type="linear"/>
<padding android:left="0dp"
android:top="0dp"
android:right="0dp"
android:bottom="0dp"/>
<size android:width="270dp"
android:height="60dp"
/>
<stroke
android:width="3dp"
android:color="#878787"
/>

Fix size in view layout ex: if you are using this for linearlayout background set say height = 100sp and widht = 100sp
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Drop Shadow Stack -->
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#30CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape android:shape="oval">
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#50CCCCCC" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape android:shape="oval">
<solid android:color="#android:color/white" />
<corners android:radius="3dp" />
</shape>
</item>
</layer-list>

Android : Layout with Rounded drop shadow

I want shape in the background of the layout like given below picture. I have tried something , Which is given below.
borders.xml
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!--Layer 0-->
<!--Layer 1-->
<!--Layer 2-->
<!--Layer 3-->
<!--Layer 4 (content background)-->
<!-- dropshadow -->
<item>
<shape>
<solid android:color="#10CCCCCC" />
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#20CCCCCC" />
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#40CCCCCC" />
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#50CCCCCC" />
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
</shape>
</item>
<item>
<shape>
<solid android:color="#60CCCCCC" />
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
</shape>
</item>
<!-- content background -->
<item>
<shape>
<solid android:color="#ffffff" />
</shape>
</item>
</layer-list>
And layout set as
android:background="#drawable/borders"
Through this implementation, I am getting like this
How can I get the drop shadow with rounded corners like below image?

you should add "corners" to the shape:
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<solid android:color="#ffffffff"/>
<stroke android:width="3dp"
android:color="#ff000000"
/>
<padding android:left="1dp"
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
/>
<corners android:radius="7dp"/>

Just add this in your Drawable layout:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<layer-list>
<item>
<shape android:shape="oval">
<gradient
android:startColor="#FF000000"
android:endColor="#00000000"
android:gradientRadius="31dp"
android:type="radial"
/>
</shape>
</item>
<item android:top="4dp" android:left="4dp" android:right="4dp" android:bottom="4dp">
<shape android:shape="oval">
<size android:width="55dp"
android:height="55dp"/>
<solid android:color="#android:color/white" />
</shape>
</item>
</layer-list>
</item>
</selector>

creating gradient stroke using layer-list

I am trying to use layer-list to create a gradient stroke (i.e. perimeter/border) as the background of my view. But it's not working.
Here is my code
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="270"
android:centerColor="#FFFFFFFF"
android:endColor="#FFCCCCCC"
android:startColor="#FFCCCCCC"
android:type="linear" />
</shape>
</item>
<item>
<shape android:shape="rectangle" >
<solid android:color="#F0F1F3" />
<margin
android:bottom="4dp"
android:left="4dp"
android:right="4dp"
android:top="4dp" />
</shape>
</item>
</layer-list>
The first item is not visible at all. only the second item fills the screen. Any thoughts on how to fix this?

Maybe this can be of use, it create some shadow effect
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- Drop Shadow Stack -->
<item>
<shape>
<corners android:radius="12dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#00CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="12dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#10CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="12dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#20CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="12dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#30CCCCCC" />
</shape>
</item>
<item>
<shape>
<corners android:radius="12dp" />
<padding
android:bottom="1dp"
android:left="1dp"
android:right="1dp"
android:top="1dp" />
<solid android:color="#50CCCCCC" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="#android:color/black" />
<corners android:radius="12dp" />
</shape>
</item>
</layer-list>

You can try something like this
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape
android:innerRadius="80dp"
android:shape="ring"
android:thickness="20dp"
android:useLevel="false">
<size
android:width="200dp"
android:height="200dp" />
<gradient
android:endColor="#00ff0000"
android:gradientRadius="200"
android:startColor="#ffff0000"
android:type="radial" />
</shape>
</item>
<item
android:bottom="20dp"
android:left="20dp"
android:right="20dp"
android:top="20dp">
<shape android:shape="oval">
<stroke
android:width="1dp"
android:color="#ff0000" />
</shape>
</item>
</layer-list>

Add shadow to custom shape on Android

Is it possible to add a drop shadow to a custom shape in Android? After looking through the documentation, I only see a way to apply a text shadow.
I've tried this with no luck:
<?xml version="1.0" encoding="UTF-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
android:shape="rectangle">
<solid android:color="#90ffffff"/>
<corners android:radius="12dp" />
<item name="android:shadowColor">#000000</item>
<item name="android:shadowRadius">5</item>
<item name="android:shadowDy">3</item>
</shape>

After Lots of search finally I got this
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Bottom 2dp Shadow -->
<item>
<shape android:shape="rectangle">
<solid android:color="#d8d8d8" />
<corners android:radius="7dp" />
</shape>
</item>
<!-- White Top color -->
<item android:bottom="3px">
<shape android:shape="rectangle">
<solid android:color="#FFFFFF" />
<corners android:radius="7dp" />
</shape>
</item>
</layer-list>

This is how I do it:
Code bellow for one button STATE:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- "background shadow" -->
<item>
<shape android:shape="rectangle" >
<solid android:color="#000000" />
<corners android:radius="15dp" />
</shape>
</item>
<!-- background color -->
<item
android:bottom="3px"
android:left="3px"
android:right="3px"
android:top="3px">
<shape android:shape="rectangle" >
<solid android:color="#cc2b2b" />
<corners android:radius="8dp" />
</shape>
</item>
<!-- over left shadow -->
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="180"
android:centerColor="#00FF0000"
android:centerX="0.9"
android:endColor="#99000000"
android:startColor="#00FF0000" />
<corners android:radius="8dp" />
</shape>
</item>
<!-- over right shadow -->
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="360"
android:centerColor="#00FF0000"
android:centerX="0.9"
android:endColor="#99000000"
android:startColor="#00FF0000" />
<corners android:radius="8dp" />
</shape>
</item>
<!-- over top shadow -->
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="-90"
android:centerColor="#00FF0000"
android:centerY="0.9"
android:endColor="#00FF0000"
android:startColor="#99000000"
android:type="linear" />
<corners android:radius="8dp" />
</shape>
</item>
<!-- over bottom shadow -->
<item>
<shape android:shape="rectangle" >
<gradient
android:angle="90"
android:centerColor="#00FF0000"
android:centerY="0.9"
android:endColor="#00FF0000"
android:startColor="#99000000"
android:type="linear" />
<corners android:radius="8dp" />
</shape>
</item>
</layer-list>
Then you should have a selector with diferent versions of the button, something like:
<?xml version="1.0" encoding="utf-8"?>
<selector xmlns:android="http://schemas.android.com/apk/res/android">
<item android:drawable="#drawable/ic_button_red_pressed" android:state_pressed="true"/> <!-- pressed -->
<item android:drawable="#drawable/ic_button_red_selected" android:state_focused="true"/> <!-- focused -->
<item android:drawable="#drawable/ic_button_red_selected" android:state_selected="true"/> <!-- selected -->
<item android:drawable="#drawable/ic_button_red_default"/> <!-- default -->
</selector>
hope this can help you..good luck

This is my version of a drop shadow. I was going for a hazy shadow all around the shape and used this answer by Joakim Lundborg as my starting point. What I changed is to add corners to all the shadow items and to increase the radius of the corner for each subsequent shadow item. So here is the xml:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#02000000" />
<corners android:radius="8dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#05000000" />
<corners android:radius="7dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#10000000" />
<corners android:radius="6dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#15000000" />
<corners android:radius="5dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#20000000" />
<corners android:radius="4dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#25000000" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<solid android:color="#30000000" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="#0099CC" />
<corners android:radius="3dp" />
</shape>
</item>
</layer-list>

I think this method produces very good results:
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
android:left="1dp"/>
<solid android:color="#00CCCCCC"/>
</shape>
</item>
<item>
<shape>
<padding
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
android:left="1dp"/>
<solid android:color="#10CCCCCC"/>
</shape>
</item>
<item>
<shape>
<padding
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
android:left="1dp"/>
<solid android:color="#20CCCCCC"/>
</shape>
</item>
<item>
<shape>
<padding
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
android:left="1dp"/>
<solid android:color="#30CCCCCC"/>
</shape>
</item>
<item>
<shape>
<padding
android:top="1dp"
android:right="1dp"
android:bottom="1dp"
android:left="1dp"/>
<solid android:color="#50CCCCCC"/>
</shape>
</item>
<item>
<shape android:shape="rectangle">
<stroke android:color="#CCC" android:width="1dp"/>
<solid android:color="#FFF" />
<corners android:radius="2dp" />
</shape>
</item>

The following worked for me: Just save as custom_shape.xml.
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android" >
<!-- "shadow" -->
<item>
<shape android:shape="rectangle" >
<solid android:color="#000000"/>
<corners android:radius="12dp" />
</shape>
</item>
<item android:bottom="3px">
<shape android:shape="rectangle">
<solid android:color="#90ffffff"/>
<corners android:radius="12dp" />
</shape>
</item>
</layer-list>

I would suggest a small improvement to Bruce's solution which is to prevent overdrawing the same shape on top of each other and to simply use stroke instead of solid.
It would look like this:
<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<!-- Drop Shadow Stack -->
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#02000000" android:width="1dp" />
<corners android:radius="8dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#05000000" android:width="1dp" />
<corners android:radius="7dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#10000000" android:width="1dp" />
<corners android:radius="6dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#15000000" android:width="1dp" />
<corners android:radius="5dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#20000000" android:width="1dp" />
<corners android:radius="4dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#25000000" android:width="1dp" />
<corners android:radius="3dp" />
</shape>
</item>
<item>
<shape>
<padding android:top="1dp" android:right="1dp" android:bottom="1dp" android:left="1dp" />
<stroke android:color="#30000000" android:width="1dp" />
<corners android:radius="3dp" />
</shape>
</item>
<!-- Background -->
<item>
<shape>
<solid android:color="#FFF" />
<corners android:radius="3dp" />
</shape>
</item>
</layer-list>
Lastly I wanted to point out for people who would like a shadow in a specific direction that all you have to do is set the top, bottom, left or right to 0dp (for a solid line) or -1dp (for nothing)

Old question, but Elevation, available with Material Design now provides a shadow to any views.
<TextView
android:id="#+id/myview"
...
android:elevation="2dp"
android:background="#drawable/myrect" />
See the docs at https://developer.android.com/training/material/shadows-clipping.html

If you don't mind doing some custom drawing with the Canvas API, check out this answer about drop shadows. Here's a follow-up question to that one which fixes a problem in the original.

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android" >
<solid android:color="#android:color/white" >
</solid>
<stroke
android:width="1dp"
android:color="#color/LightGrey" >
</stroke>
<padding
android:bottom="5dp"
android:left="2dp"
android:right="2dp"
android:top="5dp" >
</padding>
<corners
android:bottomLeftRadius="20dp"
android:bottomRightRadius="20dp"
android:radius="12dp"
android:topLeftRadius="20dp"
android:topRightRadius="20dp" />
<gradient
android:angle="90"
android:centerColor="#android:color/white"
android:centerY="0.2"
android:endColor="#99e0e0e0"
android:startColor="#android:color/white"
android:type="linear" />
</shape>

This question may be old, but for anybody in future that wants a simple way to achieve complex shadow effects check out my library here https://github.com/BluRe-CN/ComplexView
Using the library, you can change shadow colors, tweak edges and so much more. Here's an example to achieve what you seek for.
<com.blure.complexview.ComplexView
android:layout_width="400dp"
android:layout_height="600dp"
app:radius="10dp"
app:shadow="true"
app:shadowSpread="2">
<com.blure.complexview.ComplexView
android:layout_width="match_parent"
android:layout_height="match_parent"
app:color="#fdfcfc"
app:radius="10dp" />
</com.blure.complexview.ComplexView>
To change the shadow color, use app:shadowColor="your color code".

9 patch to the rescue, nice shadow could be achieved easily
especially with this awesome tool -
Android 9-patch shadow generator
PS: if project won't be able to compile you will need to move black lines in android studio editor a little bit

I think this drop shadow value is good for most cases:
<solid android:color="#20000000" />

if you need a straight line shadow (like in bottom of toolbar) you can also use gradient xml:
<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android">
<gradient
android:type="linear"
android:angle="-90"
android:startColor="#19000000" <!-- black transparent -->
android:endColor="#00000000" /> <!-- full transparent -->
</shape>
hope this help some one

For some reason shadows don't work if you set <solid> AND <stroke> on your custom background drawable. Creating a <layer-list> with separate layers for fill and borders fixes the issue:
<?xml version="1.0" encoding="utf-8"?>
<!-- Separate layers for solid and stroke, because no shadows get drawn otherwise (using elevation) -->
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item>
<shape android:shape="rectangle">
<solid android:color="#color/card_default" />
<corners android:radius="#dimen/card_corner_radius" />
</shape>
</item>
<item>
<shape android:shape="rectangle">
<stroke android:color="#color/card_border" android:width="#dimen/card_border_width"/>
<corners android:radius="#dimen/card_corner_radius" />
</shape>
</item>
</layer-list>

<?xml version="1.0" encoding="utf-8"?>
<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item
android:bottom="3dp"
android:left="5dp"
android:right="5dp"
android:top="5dp">
<shape android:shape="rectangle">
<gradient
android:startColor="#color/white"
android:endColor="#color/gray"
android:angle="270"
android:dither="false"/>
<corners android:radius="#dimen/_20dp" />
</shape>
</item>
<item
android:bottom="6dp"
android:left="6dp"
android:right="6dp"
android:top="6dp">
<shape android:shape="rectangle">
<solid android:color="#color/orange" />
<corners android:radius="#dimen/_20dp" />
</shape>
</item>
</layer-list>

Just set elevation to something like 10.
https://developer.android.com/training/material/shadows-clipping

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