Android: When using double webviews push notifications, notification callback will not be invoked

[eladmoshe]

Consider the following scenario:

1. The app has two webviews: A and B.
2. Push plugin is loaded in both webviews.
3. Webview A calls the PushPlugin.register() function to receive notifications.
4. Webview B is opened, pausing webview A.
5. Webview A is closed, and the app returns to webview B.
6. Push notification is received. From this stage the callback will no longer fire.

The root cause is that the plugin uses static variables and functions (especially gECB) therefore when webview B is closed it calls to onDestroy(), which nullify gECB which stores webview A's callback reference.