Android Ruler Picker

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

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'

  • 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"/>

• 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 */);

• 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.
    }
});

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.
    }
})

Screenshots:

Sample 1	Sample 2

What to try this out?

• You can download the sample apk from here and play with it.

Want to contribute?

Every small or large contribution to this project is appreciated. Make sure you read the contribution guide before generating the pull request.

Questions?🤔

Hit me on twitter

Acknowledgements:

• This library is based on dwfox's library DWRulerView.

License

Copyright 2018 Keval Patel

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.