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Trouble shooting

Before submitting an issue please take a moment to read though the following. Most issues are common and some solutions are listed here.

Known bugs and issues:

  • (Android) Tapping an alert in the notification centre will sometimes not result in onNotification being called issue 281
  • (Android) Not all local notification features are supported yet (PRs welcome)
  • (iOS) The OS can penalise your app for not calling the completion handler and will stop (or delay) sending notifications to your app. This will be supported from RN-0.38 PR 227
  • (Android and iOS) Don't use a string to get the date for schedule a local notification, it only works with remote debugger enabled, explanation.
// It doesn't works with the javascript engine used by React Native 
const date = new Date("10-10-2020 12:30");

A good practice to get valid date could be:

// Get date to schedule a local notification today at 12:30:00
const hour = 12;
const minute = 30;
const second = 0;

const now = new Date();
const date = new Date(
  now.getFullYear(),
  now.getMonth(),
  now.getDate(),
  hour,
  minute,
  second
);

Android tips

  • Use a physical device for remote push notifications. They will not work on an emulator.
  • Try "grepping" logcat for ReactNativeJS|RNPushNotification at debug level - it will likely shed some light onto what's happening.
  • Your GCM senderID can be obtained by obtaining a file from your google console called google-services.json. From this file use the project_number as your ID.
  • Native module cannot be null error happens when your project isn't linked correctly. Please re-read the installation instructions, specifically the bit about react-native link and MainApplication.java.
  • Take a look at the google docs for more about remote push notifications.
  • Badges do not work on all devices. You should see an error being logged once when the app starts if setting a badge isn't supported.

iOS tips

  • Use a physical device for remote push notifications. They will not work on a simulator.
  • Add a log statement (NSLog(@"push-notification received: %@", notification);) to your didReceiveRemoteNotification method in AppDelegate.m
  • Look out for APNS log messages in the device logs.

About notifications...

There are a number of different types of notifications, and they have subtly different behaviours. There are essentially 4 types, let's call them local notifications (1), noisy remote push notifications (2) and silent remote push notifications (3).

1. local notifications

Local notifications are sent from your JS/RN app and appear as alerts in the notification centre, where they sit until the user removes them. They can contain text as well as sounds, vibrations, colour, images etc. Different operating systems support different features. You can send one by calling the PushNotification.localNotification method as described in the docs. Local notifications can also be scheduled to run at a later date.

If a user taps an alert, your app will be started or brought to the foreground and onNotification will be called.

Android local notifications

These are highly customisable (more so than noisy remote push notifications) but this library doesn't yet support all features, for example you cannot stack notifications using the "grouping" feature.

2. noisy remote push notifications

Noisy remote push notifications are sent from a server, such as the Apple Push Notification Service (APNS), or the Google Cloud Messaging Service (GCM). When the app is in the background, they appear only as alerts in the notification centre and may not interact with your application in any way when they are delivered. Like local notifications they have a visual (or audible) element.

When a user taps an alert in the notification centre that was created by a noisy remote push notification, your app will be either started or brought to the foreground. The onNotification method will fired.

Android noisy remote push notifications

Your server will send something like this to GCM:

{
  "to": "<token>",
  "time_to_live": 86400,
  "collapse_key": "new_message",
  "delay_while_idle": false,
  "notification": {
    "title": "title",
    "body": "this is a noisy test",
    "tag": "new_message",
    "icon": "new_message",
    "color": "#18d821",
    "sound": "default"
  }
}

Your app will not be invoked when this is received.

iOS noisy remote push notifications

Your server will send something like this to APNS:

{
  "aps": {
    "alert": {
      "body": "the body text",
      "title": "the title"
    },
    "badge": 6,
    "sound": " default"
  }
}

Your app will not be invoked if it is running in the background, and the notification will result in an alert in the notification centre. If you app is running in the foreground, onNotification will be called with something like:

{
  "foreground": true,
  "userInteraction": false,
  "message": {
    "title": "the title",
    "body": "the body text"
  },
  "data": {
    "remote": true,
    "notificationId": "A3DC5EEE-FF97-4695-B562-3A7E89E43199"
  },
  "badge": 4,
  "alert": {
    "title": "the title",
    "body": "the body text"
  },
  "sound": " default"
}

Tapping the alert in the notification centre will start or bring the app to the foreground and onNotification will be called.

3. silent remote push notifications

Silent remote push notifications are also sent from a server. They are delivered to your app but not to the notification centre, and as such have no visual or audible content. When receiving a notification the onNotification in your JS app will be called. The app can be running in the foreground or background, the notification will always be delivered to the app.

Using a silent remote push notifications which in turn creates a customised local notification is a common pattern for providing a rich user experience.

Android silent remote push notifications

Your server will send something like this to GCM:

{
  "to": "<token>",
  "time_to_live": 86400,
  "collapse_key": "new_message",
  "delay_while_idle": false,
  "data": {
    "your-key": "your-value"
  }
}

The crucial bit is presence of the data field. Your RN/JS app will receive something like:

{
  "foreground": true,
  "your-key": "your-value",
  "google.sent_time": 1478872536263,
  "userInteraction": false,
  "google.message_id": "0:999999999999",
  "collapse_key": "new_message"
}

If your Android app is not running when a silent notification is received then this library will start it. It will be started in the background however, and if the OS starts your app in this way it will not start the react-native lifecycle. This means that if your notification delivery code relies on the react-native lifecycle then it will not get invoked in this situation. You need to structure your app in such a way that PushNotification.configure gets called as a side effect of merely importing the root index.android.js file.

iOS silent remote push notifications

Send something like this to the APNS (here are the docs):

{
  "aps": {
    "content-available": 1
  },
  "payload": "{\"your-key\":\"your-value\"}"
}

This is a pure silent push notification. It must not include a badge, sound or any alert text. These types of silent notifications are of limited use. They MUST be sent with a priority of 5 (10 is the default) and are subject to delays - basically, the OS may delay delivery if the battery is low and the phone isn't plugged in.

You can create an alternative non-pure iOS silent push notification by adding an empty string as the alert body or sound name (see this discussion). This will be delivered as a high priority message and will not be subject to OS imposed delays. Obviously this is a bit of a hack. A better approach to silent push notifications is to use react-native-voip-push-notification.

The crucial bit of an iOS silent notification is presence of the "content-available": 1 field. Your RN/JS app will receive something like:

{
  "foreground": true,
  "userInteraction": false,
  "data": {
    "remote": true,
    "payload": "{\"your-key\":\"your-value\"}",
    "notificationId": "8D8C24FF-B4F0-4D13-BA0E-295D0E474279"
  }
}

After you have processed the notification you must call isn't finish method (as of RN 0.38).

Some useful links