How to control the count of app icon badge when I get notifications?

First of all you can use Firebase.It is an application development platform from Google. It helps to create application backends quickly, offering a host of built-in features and functionalities that can be integrated readily.

$ npm install --save react-native-push-notification

Download the google-services.json file and place it in the root directory of your application module.

Use the following code from the Firebase documentation to the project level build.gradle (<project>/build.gradle):

buildscript {
repositories {
// Check that you have the following line (if not, add it):
google()  // Google's Maven repository
}
dependencies {
...
// Add this line
classpath 'com.google.gms:google-services:4.3.8'
}
}
allprojects {
...
repositories {
// Check that you have the following line (if not, add it):
google()  // Google's Maven repository
...
}
}

Also create the application level build.gradle (<project>/<app-module>/build.gradle) with this code snippet from the Firebase documentation:

apply plugin: 'com.android.application'
// Add this line
apply plugin: 'com.google.gms.google-services'
dependencies {
// Import the Firebase BoM
implementation platform('com.google.firebase:firebase-bom:28.2.1')
// Add the dependencies for the desired Firebase products
// https://firebase.google.com/docs/android/setup#available-libraries
}

Add the following code to AndroidManifest.xml

<uses-permission android:name="android.permission.WAKE_LOCK" />
<permission
android:name="${applicationId}.permission.C2D_MESSAGE"
android:protectionLevel="signature" />
<uses-permission android:name="${applicationId}.permission.C2D_MESSAGE" />
<uses-permission android:name="android.permission.VIBRATE" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>
<application .......>
<meta-data  android:name="com.dieam.reactnativepushnotification.notification_channel_name"
android:value="YOUR NOTIFICATION CHANNEL NAME"/>
<meta-data  android:name="com.dieam.reactnativepushnotification.notification_channel_description"
android:value="YOUR NOTIFICATION CHANNEL DESCRIPTION"/>
<meta-data  android:name="com.dieam.reactnativepushnotification.notification_color"
android:resource="@android:color/white"/>
<receiver
android:name="com.google.android.gms.gcm.GcmReceiver"
android:exported="true"
android:permission="com.google.android.c2dm.permission.SEND" >
<intent-filter>
<action android:name="com.google.android.c2dm.intent.RECEIVE" />
<category android:name="${applicationId}" />
</intent-filter>
</receiver>
<receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationPublisher" />
<receiver android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationBootEventReceiver">
<intent-filter>
<action android:name="android.intent.action.BOOT_COMPLETED" />
</intent-filter>
</receiver>
<service android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationRegistrationService"/>
<service
android:name="com.dieam.reactnativepushnotification.modules.RNPushNotificationListenerService"
android:exported="false" >
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT" />
</intent-filter>
</service>
... </application>

import React, {Component} from "react";
import PushNotification from "react-native-push-notification";
// var PushNotification = require("react-native-push-notification");
export default class PushController extends Component{
componentDidMount(){
PushNotification.configure({
// (optional) Called when Token is generated (iOS and Android)
onRegister: function(token) {
console.log("TOKEN:", token);
},
// (required) Called when a remote or local notification is opened or received
onNotification: function(notification) {
console.log("NOTIFICATION:", notification);
// process the notification here
// required on iOS only
notification.finish(PushNotificationIOS.FetchResult.NoData);
},
// Android only
senderID: "1090501687137",
// iOS only
permissions: {
alert: true,
badge: true,
sound: true
},
popInitialNotification: true,
requestPermissions: true
});
}
render(){
return null;
}
}

The content of the App.js file looks like this:

import React, { Fragment } from 'react';
import PushController from './PushController';
import { SafeAreaView, StyleSheet, ScrollView, View, Text, StatusBar, FlatList} from 'react-native';
import {Header, LearnMoreLinks, Colors, DebugInstructions, ReloadInstructions } from 'react-native/Libraries/NewAppScreen';
// Dummy data for list, we'll replace this with data received from push
let pushData = [
{
title: "First push",
message: "First push message"
},
{
title: "Second push",
message: "Second push message"
}
]
_renderItem = ({ item }) => (
<View key={item.title}>
<Text style={styles.title}>{item.title}</Text>
<Text style={styles.message}>{item.message}</Text>
</View>
);
const App = () => {
return (
<Fragment>
<StatusBar barStyle="dark-content" />
<SafeAreaView>
<ScrollView
contentInsetAdjustmentBehavior="automatic"
style={styles.scrollView}>
<Header />
<View style={styles.listHeader}>
<Text>Push Notifications</Text>
</View>
<View style={styles.body}>
<FlatList
data={pushData}
renderItem={(item ) => this._renderItem(item)}
keyExtractor={(item ) => item.title}
/>
{/* <LearnMoreLinks /> */}
</View>
</ScrollView>
</SafeAreaView>
<PushController/>
</Fragment>
);
};
const styles = StyleSheet.create({
scrollView: {backgroundColor: Colors.lighter,},
listHeader:{ backgroundColor: '#eee', color: "#222", height: 44, padding: 12},
title:{fontSize: 18, fontWeight: 'bold', paddingTop: 10},
message:{ fontSize: 14, paddingBottom: 15, borderBottomColor: "#ccc", borderBottomWidth: 1},
engine: { position: 'absolute', right: 0,},
body: { backgroundColor: Colors.white, paddingHorizontal: 20, paddingVertical: 10, },
sectionContainer: { marginTop: 32, paddingHorizontal: 24, },
sectionTitle: { fontSize: 24, fontWeight: '600', color: Colors.black},
sectionDescription: { marginTop: 8, fontSize: 18, fontWeight: '400', color: Colors.dark,},
highlight: { fontWeight: '700'},
footer: { color: Colors.dark, fontSize: 12, fontWeight: '600', padding: 4, paddingRight: 12, textAlign: 'right',},
});
export default App;
import React, { Fragment } from 'react';
import PushController from './PushController';
import { SafeAreaView, StyleSheet, ScrollView, View, Text, StatusBar, FlatList} from 'react-native';
import {Header, LearnMoreLinks, Colors, DebugInstructions, ReloadInstructions } from 'react-native/Libraries/NewAppScreen';
// Dummy data for list, we'll replace this with data received from push
let pushData = [
{
title: "First push",
message: "First push message"
},
{
title: "Second push",
message: "Second push message"
}
]
_renderItem = ({ item }) => (
<View key={item.title}>
<Text style={styles.title}>{item.title}</Text>
<Text style={styles.message}>{item.message}</Text>
</View>
);
const App = () => {
return (
<Fragment>
<StatusBar barStyle="dark-content" />
<SafeAreaView>
<ScrollView
contentInsetAdjustmentBehavior="automatic"
style={styles.scrollView}>
<Header />
<View style={styles.listHeader}>
<Text>Push Notifications</Text>
</View>
<View style={styles.body}>
<FlatList
data={pushData}
renderItem={(item ) => this._renderItem(item)}
keyExtractor={(item ) => item.title}
/>
{/* <LearnMoreLinks /> */}
</View>
</ScrollView>
</SafeAreaView>
<PushController/>
</Fragment>
);
};
const styles = StyleSheet.create({
scrollView: {backgroundColor: Colors.lighter,},
listHeader:{ backgroundColor: '#eee', color: "#222", height: 44, padding: 12},
title:{fontSize: 18, fontWeight: 'bold', paddingTop: 10},
message:{ fontSize: 14, paddingBottom: 15, borderBottomColor: "#ccc", borderBottomWidth: 1},
engine: { position: 'absolute', right: 0,},
body: { backgroundColor: Colors.white, paddingHorizontal: 20, paddingVertical: 10, },
sectionContainer: { marginTop: 32, paddingHorizontal: 24, },
sectionTitle: { fontSize: 24, fontWeight: '600', color: Colors.black},
sectionDescription: { marginTop: 8, fontSize: 18, fontWeight: '400', color: Colors.dark,},
highlight: { fontWeight: '700'},
footer: { color: Colors.dark, fontSize: 12, fontWeight: '600', padding: 4, paddingRight: 12, textAlign: 'right',},
});
export default App;

and at last you  have to run your project.

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