import React from "react";import { Button, Platform, Text, Vibration, View, SafeAreaView, StyleSheet }
                                                                                                          from "react-native";const Separator = () => {
  return <View style={Platform.OS === "android" ? styles.separator : null} />;}const App = () => {
  const ONE_SECOND_IN_MS = 1000;
  const PATTERN = [ 1 * ONE_SECOND_IN_MS,
                              2 * ONE_SECOND_IN_MS,
                              3 * ONE_SECOND_IN_MS];
  const PATTERN_DESC =
    Platform.OS === "android"
      ? "wait 1s, vibrate 2s, wait 3s"
      : "wait 1s, vibrate, wait 2s, vibrate, wait 3s";
  return (
    <SafeAreaView style={styles.container}>
      <Text style={[styles.header, styles.paragraph]}>Vibration API</Text>
      <View>
        <Button title="Vibrate once" onPress={() => Vibration.vibrate()} />
      </View>
      <Separator />
      {Platform.OS == "android"
        ? [<View>
              <Button title="Vibrate for 10 seconds"
               onPress={() => Vibration.vibrate(10 * ONE_SECOND_IN_MS)}/>
            </View>,
            <Separator />
          ]
        : null}
      <Text style={styles.paragraph}>Pattern: {PATTERN_DESC}</Text>
      <Button title="Vibrate with pattern"
                   onPress={() => Vibration.vibrate(PATTERN)}/>
      <Separator />
      <Button title="Vibrate with pattern until cancelled"
                   onPress={() => Vibration.vibrate(PATTERN, true)}/>
      <Separator />
      <Button title="Stop vibration pattern"
                   onPress={() => Vibration.cancel()}
  color="#FF0000" />
    </SafeAreaView>
  );}const styles = StyleSheet.create({
  container: { flex: 1, justifyContent: "center", paddingTop: 44, padding: 8},
  header: {fontSize: 18, fontWeight: "bold", textAlign: "center"},
  paragraph: {margin: 24, textAlign: "center"},
  separator: {marginVertical: 8, borderBottomColor: "#737373",
                    borderBottomWidth: StyleSheet.hairlineWidth}});export default App;