Styjun

I apply elevation attribute and a drawable background which supply a rounded outline to the EditText View, but there is no shadow as expected.

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_margin="20dp"
 android:background="#FAFAFA"
 tools:context=".MainActivity">

 <EditText
 android:id="@+id/editText"
 android:layout_width="0dp"
 android:layout_height="51dp"
 android:layout_marginTop="52dp"
 android:elevation="20dp"
 android:background="@drawable/rounded_edittext"
 android:drawableStart="@drawable/ic_search_icon"
 android:drawableLeft="@drawable/ic_search_icon"
 android:ems="10"
 android:inputType="textPersonName"
 android:paddingLeft="20dp"
 android:paddingRight="20dp"
 app:layout_constraintEnd_toEndOf="parent"
 app:layout_constraintHorizontal_bias="0.0"
 app:layout_constraintStart_toStartOf="parent"
 app:layout_constraintTop_toBottomOf="@+id/textView" />
</android.support.constraint.ConstraintLayout>

And the background rounded_edittext.xml

<?xml version="1.0" encoding="utf-8"?>
<shape xmlns:android="http://schemas.android.com/apk/res/android"
 android:shape="rectangle">
 <solid android:color="#FFFFFF"/>
 <corners
 android:bottomRightRadius="27.5dp"
 android:bottomLeftRadius="27.5dp"
 android:topLeftRadius="27.5dp"
 android:topRightRadius="27.5dp"/>
 <stroke android:color="#66000000" android:width="0.5dp"/>
</shape>

UPDATE

Below is the original design.

border color #000000 opacity 10(0~100)
shadow color #000000 opacity 5(0~100)

Replace your rounded_edittext.xml with the following code:

<layer-list xmlns:android="http://schemas.android.com/apk/res/android">
<item >
 <shape
 android:shape="rectangle">
 <solid android:color="@android:color/darker_gray" />
 <corners android:radius="27.5dp"/>
 </shape>
</item>
<item android:right="1dp" android:left="1dp" android:bottom="2dp">
 <shape
 android:shape="rectangle">
 <solid android:color="#FFFFFF"/>
 <corners
 android:radius="27.5dp"/>
 <stroke android:color="#66000000" android:width="0.5dp"/>
 </shape>
</item>

Also, replace android:elevation="20dp" from EditText with android:elevation="4dp"

Go here : Android View shadow

Or if you want to a put shadow under your view, add the following

In your Layout.xml

<View android:layout_width="match_parent"
 android:layout_height="5dp"
 android:background="@drawable/dropshadow"/>

drawble/dropshadow.xml >

<?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>