Adds a subclass of SliderPreference that maps its value to a logarithmic scale when it saves.

The current implementation is great for settings used an additive manner, but less so for settings used in a multiplicative manner¹, as perceived effects will vary by value². Typically, sliders avoid this by applying a logarithmic scale to their output, but no such option currently exists for the Android Slider Preference library.

This pull request adds the aforementioned functionality with the following edits:

• In SliderPreference, the setValue function has been broken into several different functions, to allow subclasses to hook persistence calls correctly. Externally, the class functions exactly the same as it did previously, and the amount of internal change is kept as minimal as possible.
• A new class LogarithmicSliderPreference has been added to the package net.jayschwa.android.preference. It is a subclass of SliderPreference, and has behavior identical to its parent, with the exception of functions that export or import slider values. These functions contain additional logic which maps the internal linear scale to an external logarithmic one, with float values between 0.0 and 10.0.
• Documentation has been updated to reference the new implementation.

_{1: Volume, for example. 2: One can observe this by considering 0.5 to be the default value, and calculating the effective multipliers created by high and low values. 1.0 only doubles the default, but 0.1 decreases it by a factor of 5.}

This update simplifies the build process by eliminating redundant copies of several metadata constants, replacing them instead with Gradle code that distributes their values automatically.

More specifically:

• The target SDK version now exists only in the project.properties file, and is read via a Properties object.
• The version code is set equal to the number of tags currently in the Git repository, with each tag representing a single release.
• The version name is set to the name of the most recent Git tag, with some additional descriptive text added if the current HEAD does not point directly to a tagged commit (it's actually just Git's describe command).

Changes have been tested, and seem to work without any problems.

The latest Android plugin is not compatible with the build tools version requested by the library, and Gradle will forcibly update the latter if you attempt to use the two together. The build tools version that Gradle suggests seems to work without any problems, so please make it the official version of the library.

Eclipse's insistence on having Android 17 installed was annoying, so I cleaned up the API settings a bit.

More specifically:

• Updated Eclipse's project.properties file to match the manifest.
• Removed the minimum and target API settings from the build.gradle file. These are only needed if you want to overwrite the corresponding values in the manifest, and since they are identical to those in the manifest, they are redundant.

Changes have been tested, and seem to work without any problems.

As a follow-up to #7, could I convince you to accept a smaller update as a compromise? This just makes the slider's maximum and minimum values available as public constants, so they don't have to be duplicated in client code when doing scaling.

"Fixing" issue #4 by providing a source on maven using JitPack.

Please make sure that you put a tag called "1.0" on 97f28cf. When that is done I will trigger the building process and it will be available as described in the README.md

Edit: The hash for the commit was wrong! It should be the latest commit: 97f28cf

Edit2: Btw: I needed to add the classpath/repo to make it remotely buildable

1. Added a build.gradle file
2. Updated AndroidManifest.xml for Lollipop Compatibility
3. Updated Readme.md with instructions for AS
4. Tested and used code up to Lollipop (API 21)

The documentation should be rewrite with :

allprojects {
    repositories {
        maven { url "https://jitpack.io" }
    }
}

dependencies {
    
    compile 'com.github.jayschwa:AndroidSliderPreference:v1.0.0'
}

compile 'com.github.jayschwa:AndroidSliderPreference:1.0' doesn't exist

Hi,

Please create 1.0 tag, because now it is not possible to download the library from the maven. I know I can specify commit or branch, but we have tags so please use it.

dependencies { // [...] compile 'com.github.jayschwa:AndroidSliderPreference:1.0' }

setSummary(getContext().getResources().getStringArray(summaryResId));

Android studio say Error:(93) Error: Expected resource of type array [ResourceType]

can you take a look. its in sliderPreference class. i turned off lint but then it says indexoutofbounds error.

Document says that you should clone the repository into your libs folder. This will create a folder called AndroidSliderPreference.

The document goes on to tell you to all the following to your settings.gradle.

project(':SliderPreference').projectDir = new File('libs/SliderPreference')

This causes an error during gradle sync as there is no SliderPreference folder.

I propose updating the documentation to:

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