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.