Runtime Resource Overlay (RRO) Mechanism (运行时资源替换机制)

[connglli]

RRO Overview

Each android app can have multiple set of resources; each set is packaged into a single apk, which is called an overlay, and overlay has priority

Above shows how the Android system looks for a resource. Specifically, when finding a resource via its id (i.e., R.id.xxx), the system will search the overlays according to the overlay priority, and return the first searched one (i.e., if multiple resources has the same id, the one with largest priority is chosen)

To see all overlays of a same app, use

$ adb shell cmd overlay list <pkgName>

To enable an overlay of an app, use

$ adb shell cmd overlay enable <overlayPkg>

References

• https://www.jianshu.com/p/9304089c513d

Overlay Management

OverlayManager and OverlayManagerService

:question::question::question::question::question::question::question::question::question::question: