The “composable invocations can only happen from the context of an composable function” error in Android usually occurs when you are trying to use a suspend
function in a non-suspending context. In Android, suspend
functions are a special type of function that can be used to perform asynchronous tasks and can be called using the await
operator. However, suspend
functions can only be called from within other suspend
functions or from within a CoroutineScope
.
To fix the “composable invocations can only happen from the context of an composable function” error, you need to ensure that you are calling the suspend
function from within a suspend
function or from within a CoroutineScope
. For example:
suspend fun foo() {
val result = async {
// Perform asynchronous task here
}
result.await()
}
In this example, the foo
function is a suspend
function that calls the async
function to perform an asynchronous task. The async
function returns a Deferred
object, which can be used to suspend the execution of the foo
function until the asynchronous task is complete using the await
operator.
Alternatively, you can use a CoroutineScope
to call a suspend
function. For example:
CoroutineScope(Dispatchers.Default).launch {
val result = async {
// Perform asynchronous task here
}
result.await()
}
In this example, the launch
function creates a new CoroutineScope
and launches a new coroutine in the background. The async
function is called within this coroutine, and the await
operator is used to suspend the execution of the coroutine until the asynchronous task is complete.
Overall, the key to fixing the “composable invocations can only happen from the context of an composable function” error in Android is to ensure that you are calling suspend
functions from within a suspend
function or from within a CoroutineScope
. By following these guidelines, you can avoid this error and use suspend
functions effectively in your Android app.