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App.js
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App.js
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import Constants from "expo-constants";
import * as Notifications from "expo-notifications";
import React, { useState, useEffect, useRef } from "react";
import {
Text,
View,
Button,
Platform,
TextInput,
Keyboard,
} from "react-native";
Notifications.setNotificationHandler({
handleNotification: async () => ({
shouldShowAlert: true,
shouldPlaySound: false,
shouldSetBadge: false,
}),
});
export default function App() {
const [expoPushToken, setExpoPushToken] = useState("");
const [notification, setNotification] = useState(false);
const notificationListener = useRef();
const responseListener = useRef();
const [seconds, setSeconds] = useState("");
let time = Number(seconds) * 60;
if (Number(seconds) === 0) {
time = Number(seconds) + 1;
}
useEffect(() => {
registerForPushNotificationsAsync().then((token) =>
setExpoPushToken(token)
);
notificationListener.current = Notifications.addNotificationReceivedListener(
(notification) => {
setNotification(notification);
}
);
responseListener.current = Notifications.addNotificationResponseReceivedListener(
(response) => {
console.log(response);
}
);
return () => {
Notifications.removeNotificationSubscription(
notificationListener.current
);
Notifications.removeNotificationSubscription(responseListener.current);
};
}, []);
return (
<View
style={{
flex: 1,
alignItems: "center",
justifyContent: "center",
}}
>
<Text style={{ fontSize: 20 }}>DRINK WATER 🥤</Text>
<View style={{ height: 100 }} />
<Text style={{ fontSize: 15, width: "75%", alignSelf: "center" }}>
After how much time do you want me to remind you to drink water? Please
enter that below in the input field.
</Text>
<View style={{ height: 20 }} />
<TextInput
placeholder="Enter the time in minutes"
style={{
height: 60,
borderColor: "black",
borderWidth: 1,
padding: 20,
}}
value={seconds}
onChangeText={(text) => setSeconds(text)}
keyboardType="number-pad"
onSubmitEditing={async () => {
await schedulePushNotification(time, setSeconds);
}}
/>
<View style={{ height: 20 }} />
<Button
title="Press to schedule a notification"
onPress={async () => {
await schedulePushNotification(time, setSeconds);
}}
disabled={
seconds[0] === "." ||
seconds[0] === "-" ||
seconds[0] === "," ||
seconds[0] === " " ||
!seconds
}
/>
</View>
);
}
async function schedulePushNotification(value, blank) {
if (
value[0] === "." ||
value[0] === "-" ||
value[0] === "," ||
value[0] === " " ||
!value
) {
return function reject() {
blank("");
Keyboard.dismiss();
};
}
Keyboard.dismiss();
await Notifications.scheduleNotificationAsync({
content: {
title: "DRINK WATER 🥤",
body: "Please take a minute and drink some water!!",
data: { data: "goes here" },
},
trigger: { seconds: value },
// 3600 = 1 hour
});
blank("");
}
async function registerForPushNotificationsAsync() {
let token;
if (Constants.isDevice) {
const {
status: existingStatus,
} = await Notifications.getPermissionsAsync();
let finalStatus = existingStatus;
if (existingStatus !== "granted") {
const { status } = await Notifications.requestPermissionsAsync();
finalStatus = status;
}
if (finalStatus !== "granted") {
alert("Failed to get push token for push notification!");
return;
}
token = (await Notifications.getExpoPushTokenAsync()).data;
} else {
alert("Must use physical device for Push Notifications");
}
if (Platform.OS === "android") {
Notifications.setNotificationChannelAsync("default", {
name: "default",
importance: Notifications.AndroidImportance.MAX,
vibrationPattern: [0, 250, 250, 250],
lightColor: "#FF231F7C",
});
}
return token;
}