RNCAndroidDropdownPicker was not found in the UIManager

I started getting this issue after installing the node modules on fresh install. After some research I resolved it by installing the package.

If you are using yarn for package installing

yarn add @react-native-community/picker

If you are using npm

npm install @react-native-community/picker

If you are using expo

expo install @react-native-community/picker

It's working for me:

npm install @react-native-picker/picker --save 

Linking:

iOS:

cd ios && pod install 

Android:

Clear and gradle run

Just had the same issue with a fresh install (no expo) Simple fix for me was the usual suspects.

Reset the server & cache

npx react-native start --reset-cache

Remove node modules, clean, and build. Reinstall and run again.

rm -rf node_modules

npm i

cd android/

./gradlew clean

cd ../

npx react-native run-android

The problem is with native-base version 2.x Replace this:

import { Picker, Button, Container, Form, Item, Card, Text, Icon, Label } from 'native-base';

for this:

import { Picker } from '@react-native-picker/picker';
import { Button, Container, Form, Item, Card, Text, Icon, Label } from 'native-base';

Of course you need to install:

@react-native-picker/picker

yarn add @react-native-picker/picker

Tested in react-native >= 0.68.x