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Pass null as savedState to indicate a full backup is required

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This commit is contained in:
Christopher Tate
2009-05-06 12:38:21 -07:00
parent 9a6f25033c
commit b1d790b63e
2 changed files with 11 additions and 15 deletions
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15
core/java/android/backup/BackupService.java
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@@ -39,7 +39,7 @@ import android.util.Log;
* <!-- Use the class "MyBackupService" to perform backups for my app -->
* <service android:name=".MyBackupService">
* <intent-filter>
* <action android:name="android.service.action.BACKUP" />
* <action android:name="android.backup.BackupService.SERVICE" />
* </intent-filter>
* &lt;/service&gt;</pre>
*
@@ -54,19 +54,18 @@ public abstract class BackupService extends Service {
* IntentFilter} that accepts this action.
*/
@SdkConstant(SdkConstantType.SERVICE_ACTION)
public static final String SERVICE_ACTION = "android.backup.BackupService";
public static final String SERVICE_ACTION = "android.backup.BackupService.SERVICE";
/**
* The application is being asked to write any data changed since the
* last time it performed a backup operation. The state data recorded
* during the last backup pass is provided in the oldStateFd file descriptor.
* If oldState.getStatSize() is zero or negative, no old state is available
* and the application should perform a full backup. In both cases, a representation
* of the final backup state after this pass should be written to the file pointed
* to by the newStateFd file descriptor.
* during the last backup pass is provided in the oldState file descriptor.
* If oldState is null, no old state is available and the application should perform
* a full backup. In both cases, a representation of the final backup state after
* this pass should be written to the file pointed to by the newStateFd file descriptor.
*
* @param oldState An open, read-only ParcelFileDescriptor pointing to the last backup
* state provided by the application. May be empty or invalid, in which
* state provided by the application. May be null, in which
* case no prior state is being provided and the application should
* perform a full backup.
* @param data An open, read/write ParcelFileDescriptor pointing to the backup data

11
services/java/com/android/server/BackupManagerService.java
View File

@@ -119,18 +119,15 @@ class BackupManagerService extends IBackupManager.Stub {
// one backup service per package
File savedStateName = new File(mStateDir,
request.service.packageName);
File dummyName = new File(mStateDir, "#####");
File backupDataName = new File(mDataDir,
request.service.packageName + ".data");
File newStateName = new File(mStateDir,
request.service.packageName + ".new");
// In a full backup, we pass a file that is never writeable, hence
// is always zero-sized, as a sentinel to the callee that they must
// write all of their data.
ParcelFileDescriptor savedState =
ParcelFileDescriptor.open(
(request.fullBackup) ? savedStateName : dummyName,
// In a full backup, we pass a null ParcelFileDescriptor as
// the saved-state "file"
ParcelFileDescriptor savedState = (request.fullBackup) ? null
: ParcelFileDescriptor.open(savedStateName,
ParcelFileDescriptor.MODE_READ_ONLY |
ParcelFileDescriptor.MODE_CREATE);