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Cache the scaled avatar drawables in the keyguard user switcher

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Loading the avatar icons and drawing them into the sized bitmap
turns out to be quite expensive and the cost increases with number
of users. Caching them shaves off several hundred milliseconds from
Keyguard inflation time during user switching on the lockscreen.

For instance, 15ms vs. 750ms with 3 avatars on a certain 7" tablet.

Bug: 7986933
Change-Id: I3e2065bfa25aa263133ba204ca364c3b04d7c0ff
This commit is contained in:
Amith Yamasani
2013-05-08 16:43:58 -07:00
parent e2322bdd78
commit 6fc1d4e8e6
9 changed files with 134 additions and 17 deletions
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3
core/java/android/content/Intent.java
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@ -2567,8 +2567,7 @@ public class Intent implements Parcelable, Cloneable {
/**
* Broadcast sent to the system when a user's information changes. Carries an extra
* {@link #EXTRA_USER_HANDLE} to indicate which user's information changed.
* This is only sent to registered receivers, not manifest receivers. It is sent to the user
* whose information has changed.
* This is only sent to registered receivers, not manifest receivers. It is sent to all users.
* @hide
*/
public static final String ACTION_USER_INFO_CHANGED =