## Installation

- Run `npm install react-native-fcm --save`
- Run rnpm link

## Android Configuration

- In `android/build.gradle`
```gradle
dependencies {
classpath 'com.android.tools.build:gradle:2.0.0'
classpath 'com.google.gms:google-services:3.0.0' // <- Add this line
```

- In `android/app/build.gradle`
```gradle
apply plugin: "com.android.application"
apply plugin: 'com.google.gms.google-services' // <- Add this line
...
```

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

```
<application
android:theme="@style/AppTheme">

...
<service android:name="com.evollu.react.fcm.MessagingService">
<intent-filter>
<action android:name="com.google.firebase.MESSAGING_EVENT"/>
</intent-filter>
</service>

<service android:name="com.evollu.react.fcm.InstanceIdService" android:exported="false">
<intent-filter>
<action android:name="com.google.firebase.INSTANCE_ID_EVENT"/>
</intent-filter>
</service>
...
```

### IOS Configuration

install pod 'Firebase/Messaging'

in AppDelegate.m add
```
#import "RNFIRMessaging.h"
...

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
....
[FIRApp configure]; <-- add this line
}

//add this
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification {
[[NSNotificationCenter defaultCenter] postNotificationName: FCMNotificationReceived
object:self
userInfo:notification];

}

//add this
- (void)application:(UIApplication *)application didReceiveRemoteNotification:(NSDictionary *)notification fetchCompletionHandler:(void (^)(UIBackgroundFetchResult))handler {
[[NSNotificationCenter defaultCenter] postNotificationName:FCMNotificationReceived
object:self
userInfo:notification];
handler(UIBackgroundFetchResultNoData);
}
```


### FCM config file
In [firebase console](https://console.firebase.google.com/), you can get `google-services.json` file and place it in `android/app` directory and get `googleServices-info.plist` file and place it in `/ios` directory

### Usage

```javascript

var FCM = require('react-native-fcm');

componentWillMount() {
FCM.requestPermissions();
FCM.getFCMToken().then(token => {
//store fcm token in your server
});
this.fcmNotifLsnr = DeviceEventEmitter.addListener('FCMNotificationReceived', (notif) => {
//there are two parts of notif. notif.notification contains the notification payload, notif.data contains data payload
});
this.fcmTokenLsnr = DeviceEventEmitter.addListener('FCMTokenRefreshed', (token) => {
//fcm token may not be available on first load, catch it here
});
}

componentWillUnmount() {
//prevent leak
this.fcmNotifLsnr.remove();
this.fcmTokenLsnr.remove();
}

}
```

### Response to `click_action` in Android
To allow android to respond to `click_action`, you need to define Activities and filter on specific intent. Since everything is running in MainActivity, you can have MainActivity to handle actions, however, the activity will be reload everytime. Let me know if you have better idea how to do this.
```xml
<activity
  android:name=".MainActivity"
  android:label="@string/app_name"
  android:windowSoftInputMode="adjustResize"
  android:configChanges="keyboard|keyboardHidden|orientation|screenSize">
  <intent-filter>
      <action android:name="android.intent.action.MAIN" />
      <category android:name="android.intent.category.LAUNCHER" />
  </intent-filter>
    <intent-filter>                                                       <--add this line
        <action android:name="fcm.ACTION.HELLO" />                        <--add this line, name should matche click_action
        <category android:name="android.intent.category.DEFAULT" />       <--add this line
    </intent-filter>                                                      <--add this line
</activity>
```
and pass intent into package, change MainActivity.java
```java
new FIRMessagingPackage(getIntent()),                                     <--add getIntent()
```

### Behaviour when sending `click_action` and `data` in notification
- When app is not running when user clicks notification, notification data will be passed into 
 - `FCM.initialAction`(contains `click_action` in notification payload
 - `FCM.initialData` (contains `data` payload if you send together with notification)

- When app is running in background
 - IOS will receive notificaton from `FCMNotificationReceived` event
 - Android will reload the whole react app

- When app is running in foreground
 - Both will receive notificaton from `FCMNotificationReceived` event

NOTE: it is recommend not to reply on extra data for click_action as it can be overwritten. check [this](http://stackoverflow.com/questions/33738848/handle-multiple-notifications-with-gcm)

## Q & A
### My android build is failing
Try update your SDK and google play service
### I can't get notification data when app is killed?
If you send notification with `data` only, you can only get the data message when app is in foreground or background. Killed app doesn't trigger FCMNotificationReceived. Seems that is how FCM works today
### App running in background doesn't get `FCMNotificationReceived` [Android]
Well these is [an issue opened there](https://github.com/google/gcm/issues/63). You will received data payload in FCM.initialData if you click on the notification. But if you just open the app, the data is lost.
### I can't get `notification` payload when my android app is in foreground
It is better to use data payload if you need to pass data into application. I haven't implemented notification payload bridging in android module and am not planning to (the SDK should post notification for you)
### Notification payload and data payload are mixed in iOS app.
I'm not doing any filtering. Try to add some `type` attributes to differentiate data payload from APN notification
### It is missing some features
Issues and pull requests are welcomed. Let's make this thing better!