move flag out and read me

README.md

@@ -216,6 +216,7 @@ class App extends Component {
       ```json
       {
         "fcm": {"action": "fcm.ACTION.HELLO"},
+        "opened_from_tray": 1,
         "extra": "juice"
       }
       ```
@@ -224,6 +225,7 @@ class App extends Component {
       ```json
       {
         "apns": {"action_category": "fcm.ACTION.HELLO"},
+        "opened_from_tray": 1,
         "extra": "juice"
       }
       ```
@@ -252,6 +254,10 @@ Since Lollipop, the push notification icon is required to be all white, otherwis
 
 #### I am using Proguard
 You need to add this to your `android/app/proguard-rules.pro`:
+
+#### How do I tell if user clicks the notification banner?
+- Check open from tray flag in notification. It will be either 0 or 1 for iOS and undefined or 1 for android. I decide for iOS base on [this](http://stackoverflow.com/questions/20569201/remote-notification-method-called-twice), and for android I set it if notification is triggered by intent change.
+ 
 ```
 # Google Play Services
 -keep class com.google.android.gms.** { *; }

android/src/main/java/com/evollu/react/fcm/FIRMessagingModule.java

@@ -129,8 +129,9 @@ public class FIRMessagingModule extends ReactContextBaseJavaModule implements Li
         }
         WritableMap fcm = Arguments.createMap();
         fcm.putString("action", intent.getAction());
-        fcm.putInt("opened_from_tray", 1);
         params.putMap("fcm", fcm);
+
+        params.putInt("opened_from_tray", 1);
         return params;
     }