Range slider in android

Sliders — Material Component For Android

Sliders used to view and select a value or range from the given slider bar.They’re mainly used for adjusting settings such as volume and brightness, etc.

Sliders can use icons on both ends of the bar to represent a numeric or relative scale. The range of values or the nature of the values, such as volume change, can be communicated with icons.

Sliders add into Material design in library version 1.2.0. So, you need to add 1.2.0 or higher version on material design.

Types of sliders

There are two types of sliders.

• Continuous Slider
• Discrete Slider

Also, We have a another slider called range slider.

Lets see about these sliders in detail.

Continuous Slider

Continuous sliders allow us to select any value between the given start and end value.

For example, valueFrom = “0.0” and valueTo=”100.0″ in this case, you can select any values between from and to values like 55.5, 62.0, etc.

defining the slider In the layout,

valueFrom : starting value of the slider.

valueTo : ending value of the slider.

value: setting the initial value of the slider.

Similarly, we can add a RangeSlider in a layout:

The RangeSlider has app:values attribute to set the range for the slider. we need to provide the range in arrays.

Values changes Listeners

We can observe the changes of the slider in two different ways.

by using addOnSliderTouchListener, we can observe the sliders start and stop touch position values.

similarly, we can add touch listener for the range slider.

Sliders OnChangeListener notified eveerytime the slider value changes.

Also, OnChangeListener for the RangeSlider.

Discrete Slider

Discrete slider allows user to select an exact value in the given input range.

If you want to slider to be discrete, then you need to add attribute call android:stepSize=”5.0″. This will setup the step between valueFrom and valueTo values based on the stepSize value.

For example, valueFrom = 10.0, valueTo = 50.0 and stepSize = 10.0, then you can able to select values 10.0, 20.0, 30.0, 40.0, 50.0 only.

defining discrete slider in the layout:

Also, we can add discrete in the RangeSlider.

We can observe the discrete slider values change same as continuous slider. Please check value changes Listeners above.

Setup the Slider Label

The label will be shown at the top of the slider thumb after you touch the thumb. Basically, Slider layout holding the current selected value of the slider.

We can change the behavior and label format using the below methods.

app:labelBehavior

You can change how it’s drawn via the app:labelBehavior attribute or setLabelBehavior method.

app:labelBehavior having three different modes.

• floating (default) — draw the label above the slider view.

LabelFormatter

By using a LabelFormatter you can change the display format of the selected values based on your requirement like 10KG, 12MB, like that.

That can be achieved through the setLabelFormatter method.That can be achieved through the setLabelFormatter method.

In above code, I have rounded the selected values and converted into dollars.

key properties of sliders

A Slider has a four UI elements.

1. Track
2. Thumb
3. Value Label
4. Tick Mark (only for discrete slider)

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Range slider in android

Sliders allow users to make selections from a range of values.

Contents

Before you can use Material sliders, you need to add a dependency to the Material Components for Android library. For more information, go to the Getting started page.

Add a Slider to a layout:

Observe changes to a slider:

Add a RangeSlider to a layout:

And in values/arrays.xml :

Observe changes to a range slider:

Making sliders accessible

Sliders support setting content descriptors for use with screen readers. While optional, we strongly encourage their use.

That can be done in XML via the android:contentDescription attribute or programmatically:

If using a TextView to display the value of the slider, you should set android:labelFor so that screen readers announce that TextView refers to the slider.

Adding/removing the value label

By default, the slider will show a value label above the thumb when it’s selected. You can change how it’s drawn via the app:labelBehavior attribute or setLabelBehavior method.

The modes of app:labelBehavior are:

• floating (default) — draws the label floating above the bounds of this view
• withinBounds — draws the label floating within the bounds of this view
• gone — prevents the label from being drawn

Setting a LabelFormatter

By using a LabelFormatter you can display the selected value using letters to indicate magnitude (e.g.: 1.5K, 3M, 12B). That can be achieved through the setLabelFormatter method.

The following example shows a slider for a price range in USD currency.

There are two types of sliders: 1. Continuous slider, 2. Discrete slider

A slider with two thumbs is called a range slider.

Continuous sliders allow users to make meaningful selections that don’t require a specific value.

API and source code:

The following example shows a continuous slider.

Continuous range slider

API and source code:

The following example shows a continuous range slider.

Discrete sliders display a numeric value label upon pressing the thumb, which allows a user to input an exact value.

API and source code:

The following example shows a discrete slider.

Discrete range slider

API and source code:

The following example shows a discrete range slider.

Anatomy and key properties

A slider has a track, one or two thumbs, and an optional value label. A discrete slider also has tick marks.

1. Track
2. Thumb
3. Value label (optional)
4. Tick mark (discrete sliders)

Element	Attribute	Related method(s)	Default value
Min value	android:valueFrom	setValueFrom getValueFrom	N/A
Max value	android:valueTo	setValueTo getValueTo	N/A
Step size (discrete)	android:stepSize	setStepSize getStepSize	N/A
Initial selected value (Slider)	android:value	setValue getValue	N/A
Initial selected values (RangeSlider)	app:values	setValues getValues	N/A
Height	app:trackHeight	setTrackHeight getTrackHeight	4dp
Color	app:trackColor	setTrackTintList getTrackTintList	null
Color for track’s active part	app:trackColorActive	setTrackActiveTintList getTrackActiveTintList	?attr/colorPrimary
Color for track’s inactive part	app:trackColorInactive	setTrackInactiveTintList getTrackInactiveTintList	?attr/colorSurfaceVariant
Minimum separation for adjacent thumbs	app:minSeparation	setMinSeparation getMinSeparation	0dp

Note: app:trackColor takes precedence over app:trackColorActive and app:trackColorInative . It’s a shorthand for setting both values to the same thing.

Element	Attribute	Related method(s)	Default value
Color	app:thumbColor	setThumbTintList getThumbTintList	?attr/colorPrimary
Radius	app:thumbRadius	setThumbRadiusResource setThumbRadius getThumbRadius	10dp
Elevation	app:thumbElevation	setThumbElevationResource setThumbElevation getThumbElevation	2dp
Halo color	app:haloColor	setHaloTintList getHaloTintList	?attr/colorPrimary at 24%
Halo radius	app:haloRadius	setHaloRadiusResource setHaloRadius getHaloRadius	24dp
Stroke color	app:thumbStrokeColor	setThumbStrokeColor setThumbStrokeColorResource getThumbStrokeColor	null
Stroke width	app:thumbStrokeWidth	setThumbStrokeWidth setThumbStrokeWidthResource getThumbStrokeWidth	0dp

Value label attributes

Element	Attribute	Related method(s)	Default value
Style	app:labelStyle	N/A	@style/Widget.Material3.Tooltip
Formatter	N/A	setLabelFormatter hasLabelFormatter	null
Behavior	app:labelBehavior	setLabelBehavior getLabelBehavior	floating

Note: The value label is a Tooltip.

Tick mark attributes

Element	Attribute	Related method(s)	Default value
Color	app:tickColor	setTickTintList getTickTintList	null
Color for track’s active part	app:tickColorActive	setTickActiveTintList getTickActiveTintList	?attr/colorSurfaceVariant
Color for track’s inactive part	app:tickColorInactive	setTickInactiveTintList getTickInactiveTintList	?attr/colorPrimary
Tick visible	app:tickVisible	setTickVisible isTickVisible()	true

Note: app:tickColor takes precedence over app:tickColorActive and app:tickColorInative . It’s a shorthand for setting both values to the same thing.

Element	Style
Default style	Widget.Material3.Slider

Default style theme attribute: ?attr/sliderStyle

See the full list of styles and attributes.

Sliders support Material Theming which can customize color and typography.

Slider theming example

API and source code:

The following example shows a range slider with Material Theming.

Implementing slider theming

Use theme attributes and styles in res/values/styles.xml which applies to all sliders and affects other components:

Use a default style theme attribute, styles and a theme overlay which applies to all sliders but does not affect other components:

Use the style in the layout, which affects only this specific slider:

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Range slider in android

Similar to the Android built-in SeekBar, but it allows to edit a values in a range (start, end).

Add the library dependency:

Step 1. Add the JitPack repository to your build file:

Step 2. Add the dependency to your project’s build.gradle file:

To see the list of all the available attributes, see attrs.xml

Copyright (c) 2017 Alessandro Crugnola

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