No Shadow In Appcompat And Design Library

My problem is there isn't shadow in my app. I am using AppCompat Libary, and Design Library. In preview (android studio) there is shadow, BUT I can't see in my app on the phone. He

Solution 1:

There is no default shadow unfortunately (or at least as near as I can tell, I am happy to be corrected). However, in your case, there is at least one workaround.

First, create a drawable xml file to represent your shadow (i.e. app_bar_shadow.xml):

<shape
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:shape="rectangle">    
    <gradient
        android:startColor="#02444444"
        android:endColor="#33111111"
        android:angle="90"/>
</shape>

Then add it to your layout, and assign it a scrolling behaviour. Place it just underneath your NestedScrollView in your layout file:

<View
    android:layout_width="match_parent"
    android:layout_height="4dp"
    android:id="@+id/app_bar_shadow"
    android:layout_gravity="top"
    android:background="@drawable/app_bar_shadow"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />

Solution 2:

Shadow is available starting from lollipop, are you using a phone/emulator with an older android? Unfortunately appcompat does not solve this issue for older androids