<RangeSeekBar
        android:id="@+id/barPrice"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        app:barHeight="0.2dp"
        app:barHeight2="4dp"
        app:increment="7"
        app:showLabels="false" />

Remarks

1- Add the increment attribute in attrs.xml

<attr name="increment" format="integer|float"/>

2- Define a default value in RangeSeekBar.java and create the attribute also

private static final int DEFAULT_INCREMENT = 1;
private int increment;

3- Init the increment value in private void init(Context context, AttributeSet attrs)

if (attrs == null) 
    increment = DEFAULT_INCREMENT;
else 
    increment = a.getInt(R.styleable.RangeSeekBar_increment, DEFAULT_INCREMENT);

4- Define the increment value in protected synchronized void onDraw(@NonNull Canvas canvas)

You'll have to replace the minText and maxText value. So instead of :

• minText = valueToString(getSelectedMinValue());
• maxText = valueToString(getSelectedMaxValue());

You'll have : int x;

       x = (int) ((getSelectedMinValue().intValue()+increment)/increment);
        x = x*increment;
        if (x<absoluteMaxValue.intValue()) 
            minText = ""+x;
        else
            minText=""+(absoluteMaxValue.intValue()-increment);
        
        
        x = (int) ((getSelectedMaxValue().intValue()+increment)/increment);
        x = x*increment;
        maxText = ""+x;

5 - Now you just have to use it. Hope it helps