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# RRO

Runtime Resource Overlay

RRO is a mechanism in Android OS where an resource id map of any resource can be overridden with a different resource using overlay apk.

{% @mermaid/diagram content="flowchart TD
A\[RRO app] -->|download| B(Theme App)
B --> |Push| C(system/vendor/overloay)
C --> |Set enable RRO| D(Overlay Manager Service)" %}