Why is it better to register BroadcastReceiver at runtime rather than in the manifest?

Registering a BroadcastReceiver dynamically at runtime is better than in the manifest for several reasons:

• Lifecycle control: Dynamically registered receivers are active only when needed, such as within an activity or service. This reduces load and prevents receiving unnecessary events.

• Security and performance: Receivers registered in the manifest can launch the app upon receiving broadcast messages, which can lead to excessive resource consumption and performance degradation.

• Flexibility: During runtime, receivers can be registered with different filters and conditions, which is not possible in the manifest.

• Compatibility with new Android restrictions: Starting from Android 8.0 (Oreo), many implicit broadcasts are restricted from manifest registration to save battery.

Thus, dynamic registration allows more efficient and safer management of broadcast reception.