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Nell'ambito dei limiti di esecuzione in background per Android 8.0 (livello API 26), le app destinate al livello API 26 o successivo non possono registrare ricevitori di trasmissioni per trasmissioni implicite nel loro manifest, a meno che la trasmissione non venga inviata appositamente a loro.
Tuttavia, diverse trasmissioni sono esenti da queste limitazioni. Le app possono continuare a registrare listener per le trasmissioni seguenti, indipendentemente dal livello API target dell'app.
Esenti perché questi annunci vengono inviati una sola volta, al primo avvio,
e molte app devono riceverli, ad esempio per programmare lavori e sveglie.
ACTION_USER_INITIALIZE, android.intent.action.USER_ADDED e android.intent.action.USER_REMOVED
Le autorizzazioni con privilegi proteggono queste trasmissioni, pertanto la maggior parte
delle normali app non può comunque riceverle.
Inviato solo quando cambiano le impostazioni internazionali, che non capita spesso. Potrebbe essere necessario aggiornare i dati delle app quando cambiano le impostazioni internazionali.
Alcune app devono essere a conoscenza delle modifiche apportate agli account di accesso per poter configurare operazioni pianificate per gli account nuovi e modificati.
Le app che hanno visibilità su un account ricevono questa trasmissione quando
l'account viene rimosso. Se questa è l'unica modifica all'account su cui l'app deve intervenire, consigliamo all'app di utilizzare questa trasmissione anziché la versione deprecata LOGIN_ACCOUNTS_CHANGED_ACTION.
Viene inviato solo quando l'utente cancella esplicitamente i propri dati dalle Impostazioni, pertanto è improbabile che i ricevitori della trasmissione influiscano in modo significativo sull'esperienza utente.
Alcune app devono aggiornare i dati archiviati quando viene rimosso un altro pacchetto. Per queste app non esistono buone alternative alla registrazione per questa
trasmissione.
Nota:altre trasmissioni relative ai pacchetti (come ACTION_PACKAGE_REPLACED) non sono esenti dalle limitazioni relative all'esecuzione in background. Queste trasmissioni sono talmente comuni che la loro esenzione potrebbe avere
un potenziale impatto sulle prestazioni.
Inviato dal fornitore di calendario per pubblicare il promemoria di un evento nell'app di calendario. Poiché il fornitore del calendario non sa qual è l'app di calendario, la trasmissione deve essere implicita.
Questi annunci vengono inviati come risultato delle interazioni fisiche dell'utente con il dispositivo, ad esempio l'installazione o la rimozione di volumi di archiviazione, o durante l'inizializzazione dell'avvio, man mano che i volumi disponibili vengono montati. Non sono un caso comune e di solito sono sotto il controllo dell'utente.
Le app di destinatari di SMS si basano su questi annunci.
I campioni di contenuti e codice in questa pagina sono soggetti alle licenze descritte nella Licenza per i contenuti. Java e OpenJDK sono marchi o marchi registrati di Oracle e/o delle sue società consociate.
Ultimo aggiornamento 2025-07-27 UTC.
[[["Facile da capire","easyToUnderstand","thumb-up"],["Il problema è stato risolto","solvedMyProblem","thumb-up"],["Altra","otherUp","thumb-up"]],[["Mancano le informazioni di cui ho bisogno","missingTheInformationINeed","thumb-down"],["Troppo complicato/troppi passaggi","tooComplicatedTooManySteps","thumb-down"],["Obsoleti","outOfDate","thumb-down"],["Problema di traduzione","translationIssue","thumb-down"],["Problema relativo a esempi/codice","samplesCodeIssue","thumb-down"],["Altra","otherDown","thumb-down"]],["Ultimo aggiornamento 2025-07-27 UTC."],[],[],null,["# Implicit broadcast exceptions\n\nAs part of the Android 8.0 (API level 26) [background execution\nlimits](/about/versions/oreo/background#broadcasts), apps that target the\nAPI level 26 or higher can't register broadcast receivers for implicit\nbroadcasts in their manifest unless the broadcast is sent specifically to them.\nHowever, several broadcasts are exempted from these limitations. Apps can\ncontinue to register listeners for the following broadcasts, no matter what API\nlevel the apps target.\n| **Note:** Even though these implicit broadcasts still work in the background, avoid registering listeners for them.\n\n[ACTION_LOCKED_BOOT_COMPLETED](/reference/android/content/Intent#ACTION_LOCKED_BOOT_COMPLETED), [ACTION_BOOT_COMPLETED](/reference/android/content/Intent#ACTION_BOOT_COMPLETED)\n: Exempted because these broadcasts are sent only once, at first boot,\n and many apps need to receive these broadcasts, such as to schedule jobs and alarms.\n\n[ACTION_USER_INITIALIZE](/reference/android/content/Intent#ACTION_USER_INITIALIZE), `android.intent.action.USER_ADDED`, `android.intent.action.USER_REMOVED`\n: Privileged permissions protect these broadcasts, so most normal\n apps can't receive them anyway.\n\n`android.intent.action.TIME_SET`, [ACTION_TIMEZONE_CHANGED](/reference/android/content/Intent#ACTION_TIMEZONE_CHANGED), [ACTION_NEXT_ALARM_CLOCK_CHANGED](/reference/android/app/AlarmManager#ACTION_NEXT_ALARM_CLOCK_CHANGED)\n: Clock apps might need to receive these broadcasts to update alarms when the\n time, timezone, or alarms change.\n\n[ACTION_LOCALE_CHANGED](/reference/android/content/Intent#ACTION_LOCALE_CHANGED)\n: Only sent when the locale changes, which is not often. Apps might need to\n update their data when the locale changes.\n\n[ACTION_USB_ACCESSORY_ATTACHED](/reference/android/hardware/usb/UsbManager#ACTION_USB_ACCESSORY_ATTACHED), [ACTION_USB_ACCESSORY_DETACHED](/reference/android/hardware/usb/UsbManager#ACTION_USB_ACCESSORY_DETACHED), [ACTION_USB_DEVICE_ATTACHED](/reference/android/hardware/usb/UsbManager#ACTION_USB_DEVICE_ATTACHED), [ACTION_USB_DEVICE_DETACHED](/reference/android/hardware/usb/UsbManager#ACTION_USB_DEVICE_DETACHED)\n: When an app needs to know about these USB-related events, there is no\n good alternative to registering for the broadcast.\n\n[BluetoothHeadset.ACTION_CONNECTION_STATE_CHANGED](/reference/android/bluetooth/BluetoothHeadset#ACTION_CONNECTION_STATE_CHANGED), [BluetoothA2dp.ACTION_CONNECTION_STATE_CHANGED](/reference/android/bluetooth/BluetoothA2dp#ACTION_CONNECTION_STATE_CHANGED), [ACTION_ACL_CONNECTED](/reference/android/bluetooth/BluetoothDevice#ACTION_ACL_CONNECTED), [ACTION_ACL_DISCONNECTED](/reference/android/bluetooth/BluetoothDevice#ACTION_ACL_DISCONNECTED)\n: User experience is not likely to suffer if apps receive broadcasts for these\n Bluetooth events.\n\n[ACTION_CARRIER_CONFIG_CHANGED](/reference/android/telephony/CarrierConfigManager#ACTION_CARRIER_CONFIG_CHANGED), `TelephonyIntents.ACTION_*_SUBSCRIPTION_CHANGED`, `TelephonyIntents.SECRET_CODE_ACTION`, [ACTION_PHONE_STATE_CHANGED](/reference/android/telephony/TelephonyManager#ACTION_PHONE_STATE_CHANGED), [ACTION_PHONE_ACCOUNT_REGISTERED](/reference/android/telecom/TelecomManager#ACTION_PHONE_ACCOUNT_REGISTERED), [ACTION_PHONE_ACCOUNT_UNREGISTERED](/reference/android/telecom/TelecomManager#ACTION_PHONE_ACCOUNT_UNREGISTERED)\n: OEM telephony apps might need to receive these broadcasts.\n\n[LOGIN_ACCOUNTS_CHANGED_ACTION](/reference/android/accounts/AccountManager#LOGIN_ACCOUNTS_CHANGED_ACTION)\n: Some apps need to know about changes to login accounts so they can set up\n scheduled operations for the new and changed accounts.\n\n[ACTION_ACCOUNT_REMOVED](/reference/android/accounts/AccountManager#ACTION_ACCOUNT_REMOVED)\n: Apps that have visibility into an account receive this broadcast when the\n account is removed. If this is the only account change that the app needs\n to act on, we recommend that the app use this broadcast\n instead of the deprecated\n [LOGIN_ACCOUNTS_CHANGED_ACTION](/reference/android/accounts/AccountManager#LOGIN_ACCOUNTS_CHANGED_ACTION).\n\n[ACTION_PACKAGE_DATA_CLEARED](/reference/android/content/Intent#ACTION_PACKAGE_DATA_CLEARED)\n: Only sent when the user explicitly clears their data from Settings,\n so broadcast receivers are unlikely to significantly affect user experience.\n\n[ACTION_PACKAGE_FULLY_REMOVED](/reference/android/content/Intent#ACTION_PACKAGE_FULLY_REMOVED)\n\n: Some apps need to update their stored data when another package is\n removed. For those apps, there is no good alternative to registering for this\n broadcast.\n\n **Note:** Other package-related broadcasts (such as [ACTION_PACKAGE_REPLACED](/reference/android/content/Intent#ACTION_PACKAGE_REPLACED)) are *not* exempted from\n the background execution restrictions. These broadcasts are common enough that there is a\n potential performance impact to exempting them.\n\n[ACTION_NEW_OUTGOING_CALL](/reference/android/content/Intent#ACTION_NEW_OUTGOING_CALL)\n\n: Apps that take action in response to users placing calls need to receive this\n broadcast.\n\n[ACTION_DEVICE_OWNER_CHANGED](/reference/android/app/admin/DevicePolicyManager#ACTION_DEVICE_OWNER_CHANGED)\n\n: This broadcast is not sent very often. Some apps need to receive it, so that\n they know that the device's security status changed.\n\n[ACTION_EVENT_REMINDER](/reference/android/provider/CalendarContract#ACTION_EVENT_REMINDER)\n\n: Sent by the [calendar\n provider](/guide/topics/providers/calendar-provider) to post an event\n reminder to the calendar app. Since the calendar provider doesn't know what\n the calendar app is, this broadcast must be implicit.\n\n[ACTION_MEDIA_MOUNTED](/reference/android/content/Intent#ACTION_MEDIA_MOUNTED), [ACTION_MEDIA_CHECKING](/reference/android/content/Intent#ACTION_MEDIA_CHECKING), [ACTION_MEDIA_UNMOUNTED](/reference/android/content/Intent#ACTION_MEDIA_UNMOUNTED), [ACTION_MEDIA_EJECT](/reference/android/content/Intent#ACTION_MEDIA_EJECT), [ACTION_MEDIA_UNMOUNTABLE](/reference/android/content/Intent#ACTION_MEDIA_UNMOUNTABLE), [ACTION_MEDIA_REMOVED](/reference/android/content/Intent#ACTION_MEDIA_REMOVED), [ACTION_MEDIA_BAD_REMOVAL](/reference/android/content/Intent#ACTION_MEDIA_BAD_REMOVAL)\n\n: These broadcasts are sent as a result of the user's physical interactions with\n the device, like installing or removing storage volumes, or as part of\n boot initialization, as available volumes get mounted. They aren't a common\n occurrence, and are usually under the user's control.\n\n[SMS_RECEIVED_ACTION](/reference/android/provider/Telephony.Sms.Intents#SMS_RECEIVED_ACTION), [WAP_PUSH_RECEIVED_ACTION](/reference/android/provider/Telephony.Sms.Intents#WAP_PUSH_RECEIVED_ACTION)\n\n: SMS recipient apps rely on these broadcasts."]]
