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Code Quality Rank: L5
Programming language: Java
Tags: Dialog Widget    
Latest version: v1.0.1

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README

Android Slider Preference Library

A dialog-based preference that provides slider widget functionality. Useful for settings where the range of values are not discrete and fall along a continuum. This preference will store a float between 0.0 and 1.0 in the SharedPreferences.

Overview

  • Slider represents a float between 0.0 and 1.0
  • Supports multiple summaries (e.g. "Low", "Medium", "High") and selects one based on the slider's position
    • Java: SliderPreference.setSummary(CharSequence[] summaries)
    • XML: android:summary="@array/string_array_of_summaries"
    • A single String still works too
  • Subclass of DialogPreference
    • Supports all dialog-specific attributes such as android:dialogMessage
    • Visually-consistent with Android's built-in preferences
    • Less error-prone than displaying the slider directly on the settings screen
  • MIT License

How To Use

Android Studio

Using Gradle

  1. Step: Add JitPack to your root build.gradle: allprojects { repositories { // [...] maven { url 'https://jitpack.io' } } }
  2. Step: Add the library as a dependency to your project build.gradle: dependencies { // [...] compile 'com.github.jayschwa:AndroidSliderPreference:v1.0.1' }

Using a Module

  1. Paste or clone this library into the /libs folder, in the root directory of your project. Create a new folder: /libs if not already present. (This step is not required - only for keeping cleaner project structure)

  2. Edit settings.gradle by adding the library. You also have to define a project directory for the library. Your settings.gradle should look like below:

    include ':app', ':SliderPreference'
project(':SliderPreference').projectDir = new File('libs/AndroidSliderPreference')

  3. In app/build.gradle add the SliderPreference library as a dependency:

    dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])
    compile 'com.android.support:appcompat-v7:21.0.3'
    compile project(":SliderPreference")
}

  4. Sync project, clean and build. You can use the SliderPreference as part of your project now.

Eclipse

Before you can add a SliderPreference to your application, you must first add a library reference:

  1. Clone or download a copy of the library
  2. Import the library into Eclipse: File menu -> Import -> Existing Project into Workspace
  3. Open your application's project properties and add a library reference to "SliderPreference"

Add a slider to your application

<!-- preferences.xml -->
<net.jayschwa.android.preference.SliderPreference
    android:key="my_slider"
    android:title="@string/slider_title"
    android:summary="@array/slider_summaries"
    android:defaultValue="@string/slider_default"
    android:dialogMessage="@string/slider_message" />

<!-- strings.xml -->
<string name="slider_title">Temperature</string>
<string-array name="slider_summaries">
    <!-- You can define as many summaries as you'd like -->
    <!-- The active summary will reflect the preference's current value -->
    <item>Freezing</item> <!-- 0.00 to 0.25 -->
    <item>Chilly</item>   <!-- 0.25 to 0.50 -->
    <item>Warm</item>     <!-- 0.50 to 0.75 -->
    <item>Boiling</item>  <!-- 0.75 to 1.00 -->
</string-array>
<item name="slider_default" format="float" type="string">0.5</item>
<string name="slider_message">Optional message displayed in the dialog above the slider</string>

It is possible to define the default value directly in the attribute. The summary can also be a regular string, instead of a string array:

<net.jayschwa.android.preference.SliderPreference
    android:summary="This summary is static and boring"
    android:defaultValue="0.5" />

Background

Sliders are recommended by Android's official design documentation for specific types of settings:

Use this pattern for a setting where the range of values are not discrete and fall along a continuum.

Slider design pattern example

Despite this recommendation, the Android SDK does not actually provide a Preference with slider functionality. Various custom implementations can be found around the web, but many have issues such as:

  • The slider is displayed directly on the settings screen
    • Higher chance of accidental clicks
    • No way to confirm or cancel potential changes
  • Discrete values are displayed to the user
    • Not ideal for this design pattern

This library aims to be as consistent as possible with the design pattern and Android's built-in Preference implementations.

License

This library is licensed under the MIT License. A copy of the license is provided in LICENSE.txt:

Copyright 2012 Jay Weisskopf

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.


*Note that all licence references and agreements mentioned in the AndroidSliderPreference README section above are relevant to that project's source code only.