There is

setViewContent

which accept composable function as input parameter similar to

setContent

. So I want know what is a diference between

setViewContent

and

setContent

and its use-cases. And my second question is that

setContent

and

setViewContent

both return

CompositionContext?

. So what is the usage of CompositionContext ?

Good question. Right now the primary way to use compose is by using the composables defined in

androidx.ui.*

. We call this “compose UI”. This uses compose runtime to target a tree of `ComponentNode`s. One can also use compose runtime to target a tree of `View`s. Right now,

setViewContent

is used for the latter, and

setContent

for the former. We are investigating different ways to switch between the two, but exactly how this will work is still being decided. Similarly, the exact shape of these functions may change, and the return value as well. Right now the return value is mostly used in testing. Using it is largely an “advanced usage” area and the exact API we expose on CompositionContext is likely to change pretty significantly, but you rarely need it, so i wouldn’t worry about it for now 😉