index.js

import React from 'react';
import {Metrix, MetrixConfig} from '@metrixorg/react-native-metrix';

import {AppRegistry} from 'react-native';
import {FirstScreen, SecondScreen} from './app/screen';

import {createStackNavigator} from 'react-navigation';

const RootStack = createStackNavigator({
  First: {screen: FirstScreen},
  Second: {screen: SecondScreen},
});

class MetrixSample extends React.Component {
  constructor() {
    super();
    let metrixConfig = new MetrixConfig('wevudpiqxgzfrcv');
    metrixConfig.setFirebaseAppId(
      '1:730143097783:android:227c981a44d0492eaa9e32',
    );
    Metrix.onCreate(metrixConfig);
  }

  render() {
    return <RootStack />;
  }
}

AppRegistry.registerComponent('MetrixSample', () => MetrixSample);