[Slider] Displayed slider values (minus valueFrom) are sometimes not integer multiples of stepsize due to floating point arithmetic

Description:

Open slider
Slide to 2.65x
Value is shown as 2.6499999x

Expected behavior:

Value is shown as 2.65x (rounding would mitigate the issue)

Source code: Taken from https://github.com/libre-tube/LibreTube/blob/master/app/src/main/res/layout/playback_bottom_sheet.xml:

                        <com.google.android.material.slider.Slider
                            android:id="@+id/speed"
                            android:layout_width="match_parent"
                            android:layout_height="wrap_content"
                            android:stepSize="0.05"
                            android:value="1.0"
                            android:valueFrom="0.2"
                            android:valueTo="4.0"
                            android:layout_marginTop="5dp"
                            android:layout_marginHorizontal="10dp" />

Minimal sample app repro: Not a minimal example since I do not develop for android, but a repo where the problem occurs: https://github.com/libre-tube/LibreTube. Related issue: libre-tube/LibreTube#7949

Android API version: 35 (taken from https://github.com/libre-tube/LibreTube/blob/master/app/build.gradle.kts, I hope this is correct)

Material Library version: 1.14.0-alpha06

Device: G7 Power / ocean

We've also run into this: getodk/collect#6424 We were going to address it at the application level but I agree that ideally the component would avoid this.

Looking at this one. The 2.65 case comes from getValueOfTouchPosition() scaling the snapped position back up by the value range (position * (valueTo - valueFrom) + valueFrom) instead of counting whole steps from valueFrom, so the tick alignment snapPosition() just computed gets thrown away again.

There's a second one right next to it: snapPosition() does int stepCount = (int) ((valueTo - valueFrom) / stepSize), and that cast truncates when the float division lands just below a whole number. With valueFrom=-1.5, valueTo=3.7, stepSize=0.1 the range is exactly 52 steps but it comes out as 51, so every value ends up off the 0.1 grid (touching -1 gives -0.9901961) and valueTo is never quite reachable.

Working on a fix for both, with tests.

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[Slider] Displayed slider values (minus valueFrom) are sometimes not integer multiples of stepsize due to floating point arithmetic #4978

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[Slider] Displayed slider values (minus valueFrom) are sometimes not integer multiples of stepsize due to floating point arithmetic #4978

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lognaturel commented on Dec 9, 2025

rootkiller6788 commented on Sep 17, 2026

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