How to set shadows in React Native for android?

You can try

//ios    
shadowOpacity: 0.3,
shadowRadius: 3,
shadowOffset: {
    height: 0,
    width: 0
},
//android
elevation: 1

The elevation style property on Android does not work unless backgroundColor has been specified for the element.

Android - elevation style property does not work without backgroundColor

Example:

{
  shadowColor: 'black',
  shadowOpacity: 0.26,
  shadowOffset: { width: 0, height: 2},
  shadowRadius: 10,
  elevation: 3,
  backgroundColor: 'white'
}

Another solution without using a third-party library is using elevation.

Pulled from react-native documentation. https://facebook.github.io/react-native/docs/view.html

(Android-only) Sets the elevation of a view, using Android's underlying elevation API. This adds a drop shadow to the item and affects z-order for overlapping views. Only supported on Android 5.0+, has no effect on earlier versions.

elevation will go into the style property and it can be implemented like so.

<View style={{ elevation: 2 }}>
    {children}
</View>

The higher the elevation, the bigger the shadow. Hope this helps!

Adding the CSS property elevation: 1 renders shadow in Android without installing any 3rd party library.

elevation is an Android-only style property available on the View elements.

See: React Native Docs for the elevation style property

---

If you're open to 3rd party software, another way to get shadows for android is to install react-native-shadow.

Example (adapted from the readme):

import React, { Component } from "react";
import { TouchableHighlight } from "react-native";

import { BoxShadow } from "react-native-shadow";

export default class ShadowButton extends Component {
  render() {
    const shadowOpt = {
      width: 160,
      height: 170,
      color: "#000",
      border: 2,
      radius: 3,
      opacity: 0.2,
      x: 0,
      y: 3,
      style: { marginVertical: 5 }
    };

    return (
      <BoxShadow setting={shadowOpt}>
        <TouchableHighlight
          style={{
            position: "relative",
            width: 160,
            height: 170,
            backgroundColor: "#fff",
            borderRadius: 3,
            // marginVertical: 5,
            overflow: "hidden"
          }}
        >
          ...
        </TouchableHighlight>
      </BoxShadow>
    );
  }
}