Jetpack Compose Change Slider Thumb Size

Question

Is there any way to change slider thumb size? I think for now we can only manipulate colors

var sliderPosition by remember { mutableStateOf(0f) }
Text(text = sliderPosition.toString())
Slider(
    value = sliderPosition,
    onValueChange = { sliderPosition = it },
    valueRange = 0f..100f,
    onValueChangeFinished = {
        // launch some business logic update with the state you hold
        // viewModel.updateSelectedSliderValue(sliderPosition)
    },
    steps = 5,
    colors = SliderDefaults.colors(
        thumbColor = MaterialTheme.colors.secondary,
        activeTrackColor = MaterialTheme.colors.secondary
    )
)

Answer 1

No, this size cannot be modified. The only thing you can do is copy the entire Slider.kt file into your project and modify it.

It is a good idea to give the new view a different name to avoid misunderstandings in the future.

You should change ThumbRadius constant, or make it a variable if you need different sizes in your application.

Answer 2

Yes, but only wrapping it with AndroidView and wait for the better future, when Google team release another update in Material lib.

Here is an example

  AndroidView(
    modifier = Modifier...//,
    factory = { context ->
      Slider(
        ContextThemeWrapper(context, context.theme)
      ).apply {
      // set listeners
      it.addOnSliderTouchListener(object : SliderView.OnSliderTouchListener {
        @SuppressLint("RestrictedApi")
        override fun onStartTrackingTouch(slider: Slider) = Unit

        @SuppressLint("RestrictedApi")
        override fun onStopTrackingTouch(slider: Slider) {
          onValueChangeFinished.invoke()
        }
      })
      it.addOnChangeListener { _, value, _ ->
        onValueChanged.invoke(value)
      }
        // your thumb customization
        // your track customization
      }
  }, update = {
      // set value
      it.value = currentValue
  })

Should be placed inside @Composable

• AndroidView in Compose
• Slider in Material

Answer 3

I've created a library for easy customization of Slider, since Slider from Material package is not flexible. https://github.com/krottv/compose-sliders . Below is the code example of how to use it to make thumb size smaller:

var stateSlider by remember { mutableStateOf(0.5f) }
SliderValueHorizontal(
    stateSlider, { stateSlider = it },
    modifier = Modifier
        .fillMaxWidth(),
    // desired size of Slider's thumb
    thumbSize = DpSize(8.dp, 8.dp)
)

Also you can specify custom composables for thumb and track.