Firebase onMessageReceived not called when app is inactive

Question

I am using Firebase Cloud Messaging on Android.

• I can successfully receive notification and data messages when the app is in the foreground.
• The documen

Answer 1

The problem is in your backend. See this answer. When the message contains notification object, onMessageReceived is called only when the app is foreground. So you have to use only data object. Eg:

var message = {
         to: user.deviceId, // required
         collapse_key: 'key',
         data: {
              title: 'Hello',
              body: 'Body'
         }
}; 

This works for every scenario.