32 lines
1.9 KiB
Markdown
32 lines
1.9 KiB
Markdown
|
## 3.17\. Heavyweight Apps
|
||
|
|
|
||
|
|
If device implementations declare the feature [`FEATURE_CANT_SAVE_STATE`](
|
||
|
|
https://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_CANT_SAVE_STATE),
|
||
|
|
then they:
|
||
|
|
|
||
|
|
* [C-1-1] MUST have only one installed app that specifies
|
||
|
|
[`cantSaveState`](https://developer.android.com/reference/android/R.attr#cantSaveState)
|
||
|
|
running in the system at a time. If the user
|
||
|
|
leaves such an app without explicitly exiting it (for example by pressing
|
||
|
|
home while leaving an active activity the system, instead of pressing back
|
||
|
|
with no remaining active activities in the system), then
|
||
|
|
device implementations MUST prioritize that app in RAM as they do for other
|
||
|
|
things that are expected to remain running, such as foreground services.
|
||
|
|
While such an app is in the background, the system can still apply power
|
||
|
|
management features to it, such as limiting CPU and network access.
|
||
|
|
* [C-1-2] MUST provide a UI affordance to chose the app that won't
|
||
|
|
participate in the normal state save/restore mechanism once the user
|
||
|
|
launches a second app declared with [`cantSaveState`](https://developer.android.com/reference/android/R.attr#cantSaveState)
|
||
|
|
attribute.
|
||
|
|
* [C-1-3] MUST NOT apply other changes in policy to apps that specify
|
||
|
|
[`cantSaveState`](https://developer.android.com/reference/android/R.attr#cantSaveState),
|
||
|
|
such as changing CPU performance or changing scheduling prioritization.
|
||
|
|
|
||
|
|
If device implementations don't declare the feature [`FEATURE_CANT_SAVE_STATE`](
|
||
|
|
https://developer.android.com/reference/android/content/pm/PackageManager.html#FEATURE_CANT_SAVE_STATE),
|
||
|
|
then they:
|
||
|
|
|
||
|
|
* [C-1-1] MUST ignore the [`cantSaveState`](https://developer.android.com/reference/android/R.attr#cantSaveState)
|
||
|
|
attribute set by apps and MUST NOT change the app behavior based on that
|
||
|
|
attribute.
|