IssueTracker

I was able to get the switch to stop halfway (in the on state) on a device (see screenshot).

Wow! That's an amazing bug!

Louis, can you look at it? I think this is an area that you're familiar with.

Sounds swipeable related - Matvei have you seen something like this before?

(Thanks for pointing to the duplicate; I had searched but did not notice a match based on the description.)

I noticed the same issue, on androidx.compose.material:material:1.2.0.

The full code of the button in video device-2022-08-01-123641.mp4:

            val checked2 = remember { mutableStateOf(true) }
            Switch(
                checked = checked2.value,
                onCheckedChange = { checked2.value = it },
            )

It's a bit difficult to get into this state, it tooking me 2 mins of clicking like a maniac. 😅

However, switches in our app are wrapped in another composable with Modifier.toggleable, which makes it more likely to happen, somehow. See the other video, device-2022-08-01-124251.mp4. It's a bit difficult to share the full code, but the gist of it is:

            val checked2 = remember { mutableStateOf(true) }
            SwitchCell(
                checked = checked2.value,
                onCheckedChange = { checked2.value = it },
            )

@Composable
fun SwitchCell(
    checked: Boolean,
    onCheckedChange: ((Boolean) -> Unit),
    modifier: Modifier = Modifier,
    enabled: Boolean = true,
    colors: SwitchCellColors = SwitchCellDefaults.colors(),
) {
    Row(
        modifier = modifier.toggleable(
            value = checked,
            onValueChange = { onCheckedChange(it) },
            enabled = enabled,
            role = Role.Switch
        )
    ) {
        Text("Switch Cell")

        Switch(
            checked = checked,
            enabled = enabled,
            onCheckedChange = null,
            colors = colors.switchColors
        )
    }
}

Thank you for sharing. Will try to repro! Agree with George, this is an amazing bug :D

I was able to reproduce easily by clicking the track and then quickly moving the thumb back quickly as shown in the uploaded video.

edit: The video was captured using a real device but sharing screen with my mac and using quicktime to record the interaction.

#9, which version are you seeing this on?

This is on compose version 1.4.3. Is it fixed in a newer version? If so, I can see if the team will prioritize our compose upgrade schedule.

The issue has been fixed for the general cases (such as the double click on the switch), and we are currently investigating further improvements.

Coming from bug 312680553 (has been closed because it's marked as duplicate of this bug)...I still get this bug with 1.6.0-beta01. In my case, there is some validation going on after changing the checked state which can happen very fast and is finished before the animation of the checked change finishes. The validation then changes the switch state to unchecked again but the Switch is in a state in between most times.

Code to reproduce:

        var isChecked by remember {
            mutableStateOf(false)
        }

        Switch(
            checked = isChecked,
            onCheckedChange = {
                lifecycleScope.launch {
                    isChecked = !isChecked
                    delay(40)
                    isChecked = !isChecked
                }
            }
        )

I've also attached a project which reproduces this bug (tested on emulator and Pixel 8 Pro).