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I developed an app, which receives notifications and passes information to another app, and shows users online and registered in both apps.
I wanted some way to send information to the API when the application is uninstalled by Android’s own default Unnistaller setting.
When uninstalling, it is not necessary to open an Intent, only that it sends the information.
Through an app you can know if another one has been removed but in the same app you can’t know about removing it yourself. If that way doesn’t suit you, I suggest you read here, since you are working with GCM.
– Paulo Rodrigues