Can you explain what the rememberSavable function is and its main purpose?

The rememberSavable function in Android Jetpack Compose is used to save state that should persist across configuration changes, such as screen rotations.

The main purpose of rememberSavable is to store a value in a state that is automatically saved and restored by the system when the component is recreated.

Unlike the regular remember, which only keeps the state for the lifetime of the composition, rememberSavable uses a state-saving mechanism (e.g., SavedStateHandle), allowing data to be preserved across activity or fragment recreations.

Example usage:

var text by rememberSavable { mutableStateOf("") }

TextField(
    value = text,
    onValueChange = { text = it }
)

In this example, the entered text will be saved and restored after, for instance, a screen rotation, without additional code for state saving.