I am trying to view a list of item From mainActivity class I kotlinlang #compose

I am trying to view a list of item. From mainActivity class, I am passing arrayList of item to composable function. But while running the app, I am getting this error

java.lang.RuntimeException: Unable to start activity ComponentInfo{<http://package.name/package.name.MainActivity|package.name/package.name.MainActivity>}: java.lang.IllegalStateException: Composition requires an active composition context

My mainActivity class

Copy code

class MainActivity : AppCompatActivity() {
    var dashboardList: ArrayList<Dashboard> = ArrayList()
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        fillDummyData()
        setContent {
           MainScreen(dashboardList)
        }
    }
    fun fillDummyData() {
        dashboardList.add(
            Dashboard(title="Sample title",preview="nfjsad dsaf  safsadf ", image= +imageResource(R.drawable.icon), dateTime = "Aug 10", isOnline = "true")
        )
    }
}

If i remove fillDummyData function everything is working fine.

Luca Nicoletti

11/11/2019, 8:49 AM

You’re calling

Dashboard

which I guess is a

@composable

function outside a composition

Try adding a

model

to the list, and reference the model from a

@Composable

function

amar_1995

11/11/2019, 8:51 AM

Dashboard is a data class

Okay I got your point +imageResource is composable function Now making

fillDummyData

function

@Composable

is working

Luca Nicoletti

11/11/2019, 9:02 AM

Hmmmm

Not sure that’s the best solution though

I’d store the ID in the dataclass

and retrieve the actual image inside a

composition

so from a function which is somewhere `inside`/`nested` in the

setContent

- which is to be considered a starting point for composition

as it interally calls

Compose.composeInto()

amar_1995

11/11/2019, 9:03 AM

Okay i will do the same Thanks.

Luca Nicoletti

11/11/2019, 9:03 AM

Nw .:)