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Implicit Broadcast Exceptions

As part of the Android 8.0 (API level 26) Background Execution Limits, apps that target the API level 26 or higher can no longer register broadcast receivers for implicit broadcasts in their manifest. However, several broadcasts are currently exempted from these limitations. Apps can continue to register listeners for the following broadcasts, no matter what API level the apps target.

ACTION_LOCKED_BOOT_COMPLETED, ACTION_BOOT_COMPLETED

Exempted because these broadcasts are only sent only once, at first boot, and many apps need to receive this broadcast to schedule jobs, alarms, and so forth.

ACTION_USER_INITIALIZE, "android.intent.action.USER_ADDED", "android.intent.action.USER_REMOVED"

These broadcasts are protected by privileged permissions, so most normal apps cannot receive them anyway.

"android.intent.action.TIME_SET", ACTION_TIMEZONE_CHANGED, ACTION_NEXT_ALARM_CLOCK_CHANGED

Clock apps may need to receive these broadcasts to update alarms when the time, timezone, or alarms are changed.

ACTION_LOCALE_CHANGED

Only sent when the locale changes, which is not often. Apps might need to update their data when the locale changes.

ACTION_USB_ACCESSORY_ATTACHED, ACTION_USB_ACCESSORY_DETACHED, ACTION_USB_DEVICE_ATTACHED, ACTION_USB_DEVICE_DETACHED

If an app needs to know about these USB-related events, there is not currently a good alternative to registering for the broadcast.

ACTION_CONNECTION_STATE_CHANGED, ACTION_CONNECTION_STATE_CHANGED, ACTION_ACL_CONNECTED, ACTION_ACL_DISCONNECTED

User experience is not likely to suffer if apps receive broadcasts for these Bluetooth events.

ACTION_CARRIER_CONFIG_CHANGED, TelephonyIntents.ACTION_*_SUBSCRIPTION_CHANGED, "TelephonyIntents.SECRET_CODE_ACTION"

OEM telephony apps may need to receive these broadcasts.

LOGIN_ACCOUNTS_CHANGED_ACTION

Some apps need to know about changes to login accounts so they can set up scheduled operations for the new and changed accounts.

ACTION_PACKAGE_DATA_CLEARED

Only sent when the user explicitly clears their data from Settings, so broadcast receivers are unlikely to significantly affect user experience.

ACTION_PACKAGE_FULLY_REMOVED

Some apps may need to update their stored data when another package is removed; for those apps, there is no good alternative to registering for this broadcast.

Note: Other package-related broadcasts (such as ACTION_PACKAGE_REPLACED) are not exempted from the new restrictions. These broadcasts are common enough that there is a potential performance impact to exempting them.

ACTION_NEW_OUTGOING_CALL

Apps that take action in response to users placing calls need to receive this broadcast.

ACTION_DEVICE_OWNER_CHANGED

This broadcast is not sent very often; some apps need to receive it, so that they know that the device's security status has changed.

ACTION_EVENT_REMINDER

Sent by the calendar provider to post an event reminder to the calendar app. Since the calendar provider doesn't know what the calendar app is, this broadcast has to be implicit.

ACTION_MEDIA_MOUNTED, ACTION_MEDIA_CHECKING, ACTION_MEDIA_UNMOUNTED, ACTION_MEDIA_EJECT, ACTION_MEDIA_UNMOUNTABLE, ACTION_MEDIA_REMOVED, ACTION_MEDIA_BAD_REMOVAL

These broadcasts are sent as a result of the user's physical interactions with the device (installing or removing storage volumes) or as part of boot initialization (as available volumes get mounted), so they are not a common occurrence and are generally under the user’s control.

SMS_RECEIVED_ACTION, WAP_PUSH_RECEIVED_ACTION

These broadcasts are relied on by SMS recipient apps.

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