This article delves into the intricacies of Firebase Cloud Messaging (FCM) notifications on Android, focusing on specific behavior patterns observed. A case study highlights the scenario where an app remains inactive despite receiving FCM messages while the device is locked. After unlocking the device, the app is launched via FCMFix, a few minutes after the notification is received. This delay suggests potential interactions with system sleep states and notification prioritization mechanisms, particularly with apps like WeChat.

The investigation explores possible reasons behind the delayed app launch in the locked state, considering factors such as system sleep states and potential conflicts with other notification prioritization mechanisms. The article also examines the need for explicit app lifecycle management strategies (like keeping the app in memory) to ensure prompt notification delivery, even under lock screen conditions.

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