What is “android:allowBackup”?

Question

Since the new ADT preview version (version 21), they have a new lint warning that tells me the next thing on the manifest file (in the application tag):

Answer 1

This is not explicitly mentioned, but based on the following docs, I think it is implied that an app needs to declare and implement a BackupAgent in order for data backup to work, even in the case when allowBackup is set to true (which is the default value).

http://developer.android.com/reference/android/R.attr.html#allowBackup http://developer.android.com/reference/android/app/backup/BackupManager.html http://developer.android.com/guide/topics/data/backup.html