Make process level rotated config and display metrics consistent
The application may get Resources instance from Resources.getSystem()
and context.getApplicationContext().getResources(). Since fixed
rotation is introduced that allows an activity to start in a different
rotation than the current display, when using getConfiguration() and
getDisplayMetrics() of these Resources instances, the orientation
and metrics need to be the same as current display is rotated.
Otherwise the app may show unexpected UI layout.
Although it is not recommended to use global resources/config for
activity. One of the goal of fixed rotation transform is to simulate
the app is started in a rotated environment, so this CL makes the
configuration and display metrics of system resources are consistent
with application and activity for compatibility.
About WindowProcessController and ActivityStackSupervisor:
The process configuration passed to LaunchActivityItem may be
associated from activity. if the sequence number of configuration
is overridden by activity, the configuration may be ignored when
launching the activity because the sequence number isn't larger
than the previous process configuration. Although there will be a
ConfigurationChangeItem later to update correct state, the app may
get the intermediate state with old configuration and metrics.
About ResourcesManager and DisplayAdjustments:
There are 2 new fields appWidth and appHeight added to
DisplayAdjustments#FixedRotationAdjustments because the display
metrics from Resources.getSystem() is independent from activity
configuration. Only window manager knows the rotated size, so
the values need to send to client and then ResourcesManager takes
the adjustment to change the global display metrics.
About WindowToken:
When fixed rotation is applied on the token, send the
FixedRotationAdjustmentsItem first so the later configuration
change can pick the adjustment at ActivityThread. And because the
registration of activity configuration only occurs on add/remove
activity, if it is only switching to another existing activity in
different orientation, the process configuration still needs to
be updated.
About ActivityThread:
The code flow for a rotated activity (DA = display adjustments):
- Launch new activity
handleLaunchActivity: override app DA
handleConfigurationChanged: adjust global display metrics by DA
performLaunchActivity
createBaseContextForActivity: override activity DA
- Resume existing activity
handleFixedRotationAdjustments: override app and activity DA
handleConfigurationChanged: adjust global display metrics by DA
handleResumeActivity
Also some minor corrections:
- Fix wrong display metrics adjustment that xdpi and ydpi should
not be swapped because they are physical attributes.
Bug: 167564038
Test: atest DisplayAdjustmentsTests
AppConfigurationTests#testRotatedInfoWithFixedRotationTransform
WindowProcessControllerTests#testProcessLevelConfiguration
DisplayContentTests#testApplyTopFixedRotationTransform
Change-Id: I60bedc7e09f54683d5e857ccc51402d5d144cd9e
Merged-In: I60bedc7e09f54683d5e857ccc51402d5d144cd9e
10 files changed