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reference stay organized with collections save and categorize content based on your preferences added in api level 8 summary xml attrs ctors methods inherited methods backupmanager kotlin java public class backupmanager extends object java lang object android app backup backupmanager the interface through which an application interacts with the android backup service to request backup and restore operations applications instantiate it using the constructor and issue calls through that instance when an application has made changes to data which should be backed up a call to datachanged will notify the backup service the system will then schedule a backup operation to occur in the near future repeated calls to datachanged have no further effect until the backup operation actually occurs a backup or restore operation for your application begins when the system launches the backupagent subclass you ve declared in your manifest see the documentation for backupagent for a detailed description of how the operation then proceeds several attributes affecting the operation of the backup and restore mechanism can be set on the application tag in your application s androidmanifest xml file developer guides for more information about using backupmanager read the data backup developer guide summary xml attributes android allowbackup whether to allow the application to participate in the backup and restore infrastructure android backupagent the name of the class subclassing backupagent to manage backup and restore of the application s data on external storage android killafterrestore whether the application in question should be terminated after its settings have been restored during a full system restore operation android restoreanyversion indicate that the application is prepared to attempt a restore of any backed up dataset even if the backup is apparently from a newer version of the application than is currently installed on the device public constructors backupmanager context context constructs a backupmanager object through which the application can communicate with the android backup system public methods void datachanged notifies the android backup system that your application wishes to back up new changes to its data static void datachanged string packagename convenience method for callers who need to indicate that some other package needs a backup pass userhandle getuserforancestralserialnumber long ancestralserialnumber returns a userhandle for the user that has ancestralserialnumber as the serial number of the its ancestral work profile or null if there is none int requestrestore restoreobserver observer this method was deprecated in api level 28 applications shouldn t request a restore operation using this method in android p and later this method is a no op restore the calling application from backup the data will be restored from the current backup dataset if the application has stored data there or from the dataset used during the last full device setup operation if the current backup dataset has no matching data if no backup data exists for this application in either source a non zero value is returned if this method returns zero meaning success the os attempts to retrieve a backed up dataset from the remote transport instantiate the application s backup agent and pass the dataset to the agent s onrestore method unlike other restore operations this method doesn t terminate the application after the restore the application continues running to receive the restoreobserver callbacks on the observer argument full backups use an application base class while key value backups use the application subclass declared in the androidmanifest xml application tag inherited methods from class java lang object object clone creates and returns a copy of this object boolean equals object obj indicates whether some other object is equal to this one void finalize called by the garbage collector on an object when garbage collection determines that there are no more references to the object final class getclass returns the runtime class of this object int hashcode returns a hash code value for the object final void notify wakes up a single thread that is waiting on this object s monitor final void notifyall wakes up all threads that are waiting on this object s monitor string tostring returns a string representation of the object final void wait long timeoutmillis int nanos causes the current thread to wait until it is awakened typically by being notified or interrupted or until a certain amount of real time has elapsed final void wait long timeoutmillis causes the current thread to wait until it is awakened typically by being notified or interrupted or until a certain amount of real time has elapsed final void wait causes the current thread to wait until it is awakened typically by being notified or interrupted xml attributes android allowbackup whether to allow the application to participate in the backup and restore infrastructure if this attribute is set to false no backup or restore of the application will ever be performed even by a full system backup that would otherwise cause all application data to be saved via adb the default value of this attribute is true may be a boolean value such as true or false android backupagent the name of the class subclassing backupagent to manage backup and restore of the application s data on external storage may be a string value using to escape characters such as n or uxxxx for a unicode character android killafterrestore whether the application in question should be terminated after its settings have been restored during a full system restore operation single package restore operations will never cause the application to be shut down full system restore operations typically only occur once when the phone is first set up third party applications will not usually need to use this attribute the default is true which means that after the application has finished processing its data during a full system restore it will be terminated may be a boolean value such as true or false android restoreanyversion indicate that the application is prepared to attempt a restore of any backed up dataset even if the backup is apparently from a newer version of the application than is currently installed on the device setting this attribute to true will permit the backup manager to attempt restore even when a version mismatch suggests that the data are incompatible use with caution the default value of this attribute is false may be a boolean value such as true or false public constructors backupmanager added in api level 8 public backupmanager context context constructs a backupmanager object through which the application can communicate with the android backup system parameters context context the context that was provided when one of your application s activities was created public methods datachanged added in api level 8 public void datachanged notifies the android backup system that your application wishes to back up new changes to its data a backup operation using your application s backupagent subclass will be scheduled when you call this method note this only works if your application is performing key value backups datachanged added in api level 8 public static void datachanged string packagename convenience method for callers who need to indicate that some other package needs a backup pass this can be useful in the case of groups of packages that share a uid this method requires that the application hold the android permission backup permission if the package named in the argument does not run under the same uid as the caller parameters packagename string the package name identifying the application to back up note only works for packages performing key value backups getuserforancestralserialnumber added in api level 29 public userhandle getuserforancestralserialnumber long ancestralserialnumber returns a userhandle for the user that has ancestralserialnumber as the serial number of the its ancestral work profile or null if there is none the ancestral serial number will have a corresponding userhandle if the device has a work profile that was restored from another work profile with serial number ancestralserialnumber parameters ancestralserialnumber long returns userhandle see also android os usermanager getserialnumberforuser userhandle requestrestore added in api level 8 deprecated in api level 28 public int requestrestore restoreobserver observer this method was deprecated in api level 28 applications shouldn t request a restore operation using this method in android p and later this method is a no op restore the calling application from backup the data will be restored from the current backup dataset if the application has stored data there or from the dataset used during the last full device setup operation if the current backup dataset has no matching data if no backup data exists for this application in either source a non zero value is returned if this method returns zero meaning success the os attempts to retrieve a backed up dataset from the remote transport instantiate the application s backup agent and pass the dataset to the agent s onrestore method unlike other restore operations this method doesn t terminate the application after the restore the application continues running to receive the restoreobserver callbacks on the observer argument full backups use an application base class while key value backups use the application subclass declared in the androidmanifest xml application tag parameters observer restoreobserver the restoreobserver to receive callbacks during the restore operation this must not be null returns int zero on success nonzero on error content and code samples on this page are subject to the licenses described in the content license java and openjdk are trademarks or registered trademarks of oracle and or its affiliates last updated 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