Kotlin Fluid Slider for Android

Fluid Slider is a slider widget with a popup bubble displaying the precise value selected. The idea was to have a minimal slider design with the value inside the slider that also allows you to see it when you drag the slider hence the value offset animation on tap.

Previously we’ve seen some article on Android Slider like :

CardSlider for Android
Vega Scroll Layout Android Slider

Ok, Now lets dive with implementation and coding part and let’s start from Requirement.

Requirements

Android 4.1 Jelly Bean (API lvl 16) or greater
Your favorite IDE

Installation

Just download the package from here and add it to your project classpath, or just use the maven repo:

Gradle:

implementation 'com.ramotion.fluidslider:fluid-slider:0.2.0'

SBT:

libraryDependencies += "com.ramotion.fluidslider" % "fluid-slider" % "0.2.0"

Maven:

<dependency>
  <groupId>com.ramotion.fluidslider</groupId>
  <artifactId>fluid-slider</artifactId>
  <version>0.2.0</version>
  <type>aar</type>
</dependency>

Download Kotlin Fluid Slider :

Add Fluid Slider in layout

Place the FluidSlider in your layout.
To track the current position of the slider, set the positionListener, as shown below:

val slider = findViewById<FluidSlider>(R.id.fluidSlider)
slider.positionListener = { p -> Log.d("MainActivity", "current position is: $p" )}

You can also track the beginning and completion of the movement of the slider, using the following properties:beginTrackingListener andendTrackingListener. Example below:

slider.beginTrackingListener = { /* action on slider touched */ }
slider.endTrackingListener = { /* action on slider released */ }

Full Source Code

Here is simple example, how to change FluidSlider range.

// Kotlin
val max = 45
val min = 10
val total = max - min

val slider = findViewById<FluidSlider>(R.id.fluidSlider)
slider.positionListener = { pos -> slider.bubbleText = "${min + (total  * pos).toInt()}" }
slider.position = 0.3f
slider.startText ="$min"
slider.endText = "$max"

// Java
final FluidSlider slider = findViewById(R.id.fluidSlider);
slider.setBeginTrackingListener(new Function0<Unit>() {
    @Override
    public Unit invoke() {
        Log.d("D", "setBeginTrackingListener");
        return Unit.INSTANCE;
    }
});

slider.setEndTrackingListener(new Function0<Unit>() {
    @Override
    public Unit invoke() {
        Log.d("D", "setEndTrackingListener");
        return Unit.INSTANCE;
    }
});

// Or Java 8 lambda
slider.setPositionListener(pos -> {
    final String value = String.valueOf( (int)((1 - pos) * 100) );
    slider.setBubbleText(value);
    return Unit.INSTANCE;
});