react-native-camera-kit/example/CameraScreen.android.js

import React, { Component } from 'react';
import {
	AppRegistry,
	StyleSheet,
	Text,
	View,
	ListView,
	TouchableOpacity,
	Image
} from 'react-native';

import _ from 'lodash';
import Immutable from 'seamless-immutable';

import {
	CameraKitGallery,
	CameraKitCamera,
} from 'react-native-camera-kit';

const FLASH_MODE_AUTO = "auto";
const FLASH_MODE_ON = "on";
const FLASH_MODE_OFF = "off";
const FLASH_MODE_TORCH = "torch";

export default class CameraScreen extends Component {

	constructor(props) {

		super(props);
		const ds = new ListView.DataSource({rowHasChanged: (r1, r2) => r1 !== r2});
		this.state = {
			albums:{},
			albumsDS: ds,
			shouldOpenCamera: false,
			shouldShowListView: false,
			image:{imageURI:""},
			flashMode:FLASH_MODE_AUTO
		}
	}
	render() {
			return (
				this._renderCameraView()
			);
	}

	_renderCameraView() {
		return (
			<View style={{ flex:1,  backgroundColor: 'gray', marginBottom:8}}>

				<View style={{flex: 1, flexDirection:'column', backgroundColor:'black'}} onPress={this.onTakeIt.bind(this)}>
					<CameraKitCamera
						ref={(cam) => {
                  this.camera = cam;
                }}
						style={{flex: 1}}
						cameraOptions= {{
                    flashMode: 'auto',    // on/off/auto(default)
                    focusMode: 'on',      // off/on(default)
                    zoomMode: 'on'        // off/on(default)
                  }}
					/>
					<TouchableOpacity style={{alignSelf:'center', marginHorizontal: 4}} onPress={this.onTakeIt.bind(this)}>
						<Text style={{fontSize: 22, color: 'lightgray', backgroundColor: 'hotpink'}}>TAKE IT!</Text>
					</TouchableOpacity>
				</View>


				<View style={{flexDirection: 'row'}}>

					<Image
						style={{ flexDirection:'row', backgroundColor: 'black', width: 100, height: 100}}
						source={{uri: this.state.image.imageURI, scale: 3}}
					/>

					<TouchableOpacity style={{alignSelf:'center', marginHorizontal: 4}} onPress={this.onLogData.bind(this)}>
						<Text>log data</Text>
					</TouchableOpacity>

					<TouchableOpacity style={{alignSelf:'center', marginHorizontal: 4}} onPress={this.onSwitchCameraPressed.bind(this)}>
						<Text>switch camera</Text>
					</TouchableOpacity>

					<View style={{ flexDirection:'column', justifyContent: 'space-between'}}>
						<TouchableOpacity style={{ marginHorizontal: 4}} onPress={this.onSetFlash.bind(this, FLASH_MODE_AUTO)}>
							<Text>flash auto</Text>
						</TouchableOpacity>

						<TouchableOpacity style={{ marginHorizontal: 4, }} onPress={this.onSetFlash.bind(this, FLASH_MODE_ON)}>
							<Text>flash on</Text>
						</TouchableOpacity>

						<TouchableOpacity style={{ marginHorizontal: 4,}} onPress={this.onSetFlash.bind(this, FLASH_MODE_OFF)}>
							<Text>flash off</Text>
						</TouchableOpacity>

						<TouchableOpacity style={{ marginHorizontal: 4,}} onPress={this.onSetFlash.bind(this, FLASH_MODE_TORCH)}>
							<Text>flash torch</Text>
						</TouchableOpacity>
					</View>

				</View>
			</View>
		)
	}

	async onSwitchCameraPressed() {
		const success = await this.camera.changeCamera();
	}

	async onLogData() {
		const success = await this.camera.logData();
	}

	async onCheckAuthoPressed() {
		const success = await CameraKitCamera.checkDeviceAuthorizarionStatus();
		//if (success){
		//	AlertIOS.alert('You rock!')
		//}
		//else {
		//	AlertIOS.alert('You fucked!')
		//}
	}

	async onSetFlash(flashMode) {
		const success = await this.camera.setFlashMode(flashMode);
	}

	async onTakeIt() {
		const imageURI = await this.camera.capture(true);
		let newImage = {imageURI: imageURI.uri};

		this.setState({...this.state, image:newImage});
	}
}