The notifications you've examined so far in this chapter have all required input from the user. This is by design because it's important information that we're forcing the user to look at. You don't want to over-do this, however. For notifications that are important but not life-altering if ignored, you can use passive notifications. These are displayed in a less obtrusive way than modals, and don't require any user action to dismiss.
In this section, we'll create a Notification component that uses the Toast API for Android, and creates a custom modal for iOS. It's called the Toast API because the information that's displayed looks like a piece of toast popping up. Here's what the Android component looks like:
import React, { PropTypes } from 'react';
import { ToastAndroid } from 'react-native';
import { Map as ImmutableMap } from 'immutable';
// Toast helper. Always returns "null" so that the
// output can be rendered as a React element...