# Android Installation Guide

## Prerequisites

The documentation that follows assumes you have generated a React Native Android project using the `react-native-cli`, i.e.:

```
react-native init ReactNativeAzureNotificationHubSample
```

In addition to the standard React Native requirements, you will also need to install the following Android SDK components with your prefered SDK management tools:
* Google Play services

## Install react-native-azurenotificationhub

```
npm install react-native-azurenotificationhub
```

## Create a Notification Hub

* Log on to the [Azure Portal](https://portal.azure.com) and create a new **Notification Hub**.

![Create Notification Hub](img/CreateNotificationHub.png)

## Register app with Notification Hub

* Log in to the [Firebase console](https://firebase.google.com/console/) and create a new Firebase project if you don't already have one.
* After your project is created click **Add Firebase to your Android app** and folow the instructions provided.

![Add Firebase to Android](./img/AddFirebaseToAndroid.png).

* In the Firebase Console, click the cog for your project and then click **Project Settings**

![Firebase Project Settings](./img/FirebaseProjectSettings.png)

* Click the **Cloud Messaging** tab in your project settings and copy the value of the **Server key** and **Sender ID**. The former will be used to configure the Notification Hub Access Policy and and the latter for your React Native module registration.

* Back on the [Azure Portal](https://portal.azure.com) page for your notification hub, select **Settings > Notification Services > Google (GCM)**. Enter the FCM **Server key** you copied from the [Firebase console](https://firebase.google.com/console/) and click **Save**.

![Configure GCM](./img/ConfigureGCM.png)

## Merging of icon resources

In `android/app/src/main/AndroidManifest.xml`

```xml  
    <application
      xmlns:tools="http://schemas.android.com/tools"
      tools:replace="android:icon,android:allowBackup"
      ...>
    </application>
```

This resolves the error caused by the manifest merger tool for gradle.

## Export React Native Module from app
In `android/build.gradle`

```gradle
...

buildscript {
	...
    dependencies {
        ...
        classpath("com.google.gms:google-services:4.2.0")
    }
}

allprojects {
    repositories {
        ...
        maven { url 'https://dl.bintray.com/microsoftazuremobile/SDK' }
    }
}

```

In `android/app/build.gradle`

```gradle
...
dependencies {
    ...

    implementation project(":react-native-azurenotificationhub") // <- Note only include this line if using a version of RN < 0.60 since it will be auto linked
    implementation "com.google.firebase:firebase-messaging:17.6.0"
    implementation "com.google.firebase:firebase-core:16.0.8"
}

apply plugin: "com.google.gms.google-services"

```

In `android/app/src/main/AndroidManifest.xml`

```xml
    ...
    
    <uses-permission android:name="android.permission.INTERNET"/>
    <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
    <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE" />
    
    <application ...>
      ...
        <uses-library
            android:name="org.apache.http.legacy"
            android:required="false" />

        <service
            android:name="com.azure.reactnative.notificationhub.ReactNativeRegistrationIntentService"
            android:exported="false"
            android:permission="android.permission.BIND_JOB_SERVICE" />

        <service
            android:name="com.azure.reactnative.notificationhub.ReactNativeFirebaseMessagingService"
            android:stopWithTask="false">
            <intent-filter>
                <action android:name="com.google.firebase.MESSAGING_EVENT" />
            </intent-filter>
        </service>

        <activity
          android:launchMode="singleTop"
          ...>
        </activity>
    ...
```

## If using a version of React Native before [RN 0.60](https://github.com/facebook/react-native/releases/tag/v0.60.0) that does not support autolinking:

In `android/settings.gradle`

```gradle
...

include ':react-native-azurenotificationhub'
project(':react-native-azurenotificationhub').projectDir = file('../node_modules/react-native-azurenotificationhub/android')
```

Register the module package in `MainApplication.java`

```java
import com.azure.reactnative.notificationhub.ReactNativeNotificationHubPackage;

public class MainApplication extends Application implements ReactApplication {

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {
    @Override
    protected boolean getUseDeveloperSupport() {
      return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
          new ReactNativeNotificationHubPackage() // <-- Add this package
      );
    }
  };

  ...
}
```

## JavaScript Configuration

On the [Azure Portal](https://portal.azure.com) page for your notification hub, copy a connection string from **Settings > Access Policies**.

![Get Connection String](img/GetConnectionString.png)

The example below shows how you can register and unregister from Azure Notification Hub in your React component.

```js
import React, { Component } from 'react';
import { NativeEventEmitter } from 'react-native';
import {
  StyleSheet,
  Text,
  TouchableOpacity,
  View,
} from 'react-native';

const NotificationHub = require('react-native-azurenotificationhub');
const PushNotificationEmitter = new NativeEventEmitter(NotificationHub);

const EVENT_AZURE_NOTIFICATION_HUB_REGISTERED           = 'azureNotificationHubRegistered';
const EVENT_AZURE_NOTIFICATION_HUB_REGISTERED_ERROR     = 'azureNotificationHubRegisteredError';
const EVENT_REMOTE_NOTIFICATION_RECEIVED                = 'remoteNotificationReceived';

const connectionString = '...';       // The Notification Hub connection string
const hubName = '...';                // The Notification Hub name
const senderID = '...';               // The Sender ID from the Cloud Messaging tab of the Firebase console
const tags = [ ... ];                 // The set of tags to subscribe to
const channelName = '...';            // The channel's name
const channelImportance = 3;          // The channel's importance (NotificationManager.IMPORTANCE_DEFAULT = 3)
                                      // Notes:
                                      //   1. Setting this value to 4 enables heads-up notification on Android 8
                                      //   2. On some devices such as Samsung Galaxy, changing this value requires
                                      //      uninstalling/re-installing the app to take effect.
const channelShowBadge = true;
const channelEnableLights = true;
const channelEnableVibration = true;

export default class App extends Component {
  constructor(props) {
    super(props);
    PushNotificationEmitter.addListener(EVENT_REMOTE_NOTIFICATION_RECEIVED, this._onRemoteNotification);
  }

  register() {
    PushNotificationEmitter.addListener(EVENT_AZURE_NOTIFICATION_HUB_REGISTERED, this._onAzureNotificationHubRegistered);
    PushNotificationEmitter.addListener(EVENT_AZURE_NOTIFICATION_HUB_REGISTERED_ERROR, this._onAzureNotificationHubRegisteredError);
  
    NotificationHub.register({
      connectionString,
      hubName,
      senderID,
      tags,
      channelName,
      channelImportance,
      channelShowBadge,
      channelEnableLights,
      channelEnableVibration
    })
    .catch(reason => console.warn(reason));
  }

  unregister() {
    NotificationHub.unregister()
      .catch(reason => console.warn(reason));
  }

  render() {
    return (
      <View style={styles.container}>
        <TouchableOpacity onPress={this.register.bind(this)}>
         <View style={styles.button}>
           <Text style={styles.buttonText}>
             Register
           </Text> 
         </View>
       </TouchableOpacity>
       <TouchableOpacity onPress={this.unregister.bind(this)}>
         <View style={styles.button}>
           <Text style={styles.buttonText}>
             Unregister
           </Text> 
         </View>
       </TouchableOpacity>
      </View>
    );
  }
  
  _onAzureNotificationHubRegistered(registrationID) {
    console.warn('RegistrationID: ' + registrationID);
  }
  
  _onAzureNotificationHubRegisteredError(error) {
    console.warn('Error: ' + error);
  }
  
  _onRemoteNotification(notification) {
    console.warn(notification);
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
    backgroundColor: '#F5FCFF',
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10,
  },
  instructions: {
    textAlign: 'center',
    color: '#333333',
    marginBottom: 5,
  },
});
```
