Ensure your Firebase Cloud Messaging notifications reach your users on Android

Android battery optimizations such as Doze mode can delay Firebase Cloud Messaging notifications, especially normal-priority messages, which are delivered opportunistically while a device screen is off. High-priority FCM messages can wake sleeping devices and are recommended for timely, user-visible alerts such as fraud warnings, chat messages, and delivery updates, while normal priority suits nonurgent notifications like bank statements. Developers can configure priority through the Firebase Admin SDK or FCM REST API, although Android-specific fields are unavailable in the Firebase console, and should avoid using high priority for non-visible updates because excessive misuse can cause throttling or deprioritization. Message handling in `onMessageReceived` should immediately render notifications, while longer work such as fetching images or remote content should use WorkManager, with expedited jobs for high-priority messages and regular work requests for normal-priority messages. Testing high-priority delivery in Doze mode using a device token and appropriately configured FCM payloads helps verify that notifications remain timely and reliable while respecting battery life.

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