tree ba6efc9b322dadcb4520548dee4f276328716fb4
parent b3e957bb9d3a3811412e5d94233c7f7e2e777c28
author Brad Fitzpatrick <bradfitz@android.com> 1282066155 -0700
committer Brad Fitzpatrick <bradfitz@android.com> 1282066155 -0700

Avoid unnecessary SharedPrefences disk writes.

Apps commonly edit + commit redundant changes to their
SharedPreferences, not checking the existing values.  Rather than
force all apps to double-check that their settings writes aren't
redundant, we should just make .commit() faster (avoiding the disk
write) when the file already exists on disk and no effective changes
were made.

Change-Id: I7edbd0d3ace5b69b7af6d12c39797c8b7f86230b