可以通过以下代码示例实现：

1. 首先，定义不同的主题颜色，例如：

val YellowTheme = MaterialTheme.colors.copy(
    primary = Color.Yellow,
    secondary = Color.Gray,
)

val IndigoTheme = MaterialTheme.colors.copy(
    primary = Color.Indigo,
    secondary = Color.Gray,
)

2. 创建一个MutableState变量，用于存储当前选择的主题颜色，例如：

val currentColor = remember { mutableStateOf(Color.Yellow) }

3. 在需要更改主题颜色的地方，使用LaunchedEffect实现颜色平滑过渡的效果，例如：

LaunchedEffect(currentColor.value) {
    val targetColor = if (currentColor.value == YellowTheme.primary) IndigoTheme.primary else YellowTheme.primary
    animateColorTransition(targetColor)
}

fun animateColorTransition(targetColor: Color) {
    val transition = ColorTransition(currentColor.value, targetColor)
    for (color in transition) {
        currentColor.value = color
        delay(10)
    }
}

class ColorTransition(startColor: Color, endColor: Color) : Sequence {
    private val fromRed = startColor.red
    private val fromGreen = startColor.green
    private val fromBlue = startColor.blue
    private val toRed = endColor.red
    private val toGreen = endColor.green
    private val toBlue = endColor.blue

    override fun iterator(): Iterator = (0..100).iterator().map { fraction ->
        Color(
            lerp(fromRed, toRed, fraction / 100f),
            lerp(fromGreen, toGreen, fraction / 100f),
            lerp(fromBlue, toBlue, fraction / 100f),
        )
    }

    private fun lerp(startValue: Int, endValue: Int, fraction: Float): Int =
        (startValue + (fraction * (endValue - startValue))).roundToInt()
}

4. 使用MaterialTheme和currentColor变量为组件设置