Android Ruler Picker

Android custom view that uses ruler for picking the number from given range.

Screenshots:

Sample 1 Sample 2
ruler-view-profile-demo-small ruler-view-demo-small

Features:

  • Easy to integrate. All you have to do is add the view into your XML and listen for the value changes.
  • Highly customizable. Change width, height, color, distance between indicators. Change the color and sze of the texts in the ruler in XML or dynamically from your java or kotlin code.
  • Extremely lightweight ?.

How to use this library?

  • Gradle dependency:

    • Add below dependency into your build.gradle file.
      compile 'com.kevalpatel2106:ruler-picker:1.0'
      Groovy
    • For other build systems see Import.md.

  • Add RulerValuePicker inside your XML layout.

<com.kevalpatel2106.rulerpicker.RulerValuePicker
    android:id="@+id/ruler_picker"
    android:layout_width="match_parent"
    android:layout_height="100dp"
    android:background="@android:color/holo_orange_dark"
    app:indicator_color="@android:color/white"
    app:indicator_interval="14dp"
    app:indicator_width="2dp"
    app:max_value="120"
    app:min_value="35"
    app:notch_color="@android:color/white"
    app:ruler_text_size="6sp"/>
XML
  • Library provides XML attributes to customize the RulerValuePicker or you can customize it dynamically using Java/Kotlin code.
Attribute Type Java/Kotlin Description
indicator_color Color setIndicatorColor() Change the color of the indicator in the ruler.
indicator_interval Dimensions setIndicatorIntervalDistance() Change the distance between two indicators in the ruler.
indicator_width Dimensions setIndicatorWidth() Change the width (thickness) of the indicator.
notch_color Color setNotchColor() Change the color off the notch at the top of the ruler.
ruler_text_size Dimensions setTextSize() Change the size of the text that displays the values in the ruler.
ruler_text_color Color setTextColor() Change the color of the text that displays the values in the ruler.
long_height_height_ratio Fraction setIndicatorHeight() Change the height of the long indicator. The value is between 0 to 1 where 1 indicates the height of the ruler. This value must be greater than or equal to long_height_height_ratio.
short_height_height_ratio Fraction setIndicatorHeight() Change the height of the short indicator. The value is between 0 to 1 where 1 indicates the height of the ruler. This value must be less than or equal to short_height_height_ratio.
max_value Integer setMinMaxValue() Maximum possible value to display in the ruler. This value must be greater than min_value.
min_value Integer setMinMaxValue() Minimum possible value to display in the ruler. This value must be greater than max_value.
  • Set the initially selected value.
rulerValuePicker.selectValue(55 /* Initial value */);
Java
  • Set up a RulerValuePickerListener callback listener to get notify when the selected value changes. Application will receive the final selected value in onValueChange() callback.

Java:

rulerValuePicker.setValuePickerListener(new RulerValuePickerListener() {
    @Override
    public void onValueChange(final int selectedValue) {
        //Value changed and the user stopped scrolling the ruler.
        //Application can consider this value as final selected value.
    }

    @Override
    public void onIntermediateValueChange(final int selectedValue) {
        //Value changed but the user is still scrolling the ruler.
        //This value is not final value. Application can utilize this value to display the current selected value.
    }
});
Java

Kotlin:

rulerValuePicker.setValuePickerListener(object : RulerValuePickerListener {
    override fun onValueChange(value: Int) {
        //Value changed and the user stopped scrolling the ruler.
        //You can consider this value as final selected value.
    }

    override fun onIntermediateValueChange(selectedValue: Int) {
        //Value changed but the user is still scrolling the ruler.
        //This value is not final value. You can utilize this value to display the current selected value.
    }
})
Kotlin

GitHub