Alps

Alps is a minimal Android library for reading and writing to your app’s shared preferences.

Installation

Add JitPack to the list of repositories:

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

Add Alps as a dependency in the app build file:

dependencies {
    compile "com.github.calintat.alps:alps-core:2.0.2"
}

Features

Get & put methods

The easiest way to access your app’s preferences is with the get and put methods:

String preference = getString("key", "default_value");
preference = "updated_value"; putString("key", preference);

Property delegates

In Kotlin, you can instead use property delegates, for example:

var preference by stringPref("key", "default_value")
preference = "updated_value" // will also update the preference value

Populate with preferences

Usually your settings activity will contain a PreferenceFragment inside a container.

With Alps, you can easily add a PreferenceFragment generated from an XML preference file:

public class SettingsActivity extends Activity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        ...
        populateWithPreferences(R.id.container, R.xml.preferences);
    }
}

Define preferences with the Alps DSL

In Kotlin, you can also use a DSL to define your preferences and add them to your settings activity:

dependencies {
    compile "com.github.calintat.alps:alps-dsl:2.0.2"
}

class SettingsActivity : Activity() {
    override onCreate(savedInstanceState: Bundle?) {
        ...
        populateWithPreferences(R.id.container) {
            preferenceCategory {
                title = "Alps"
                switchPreference(key = "pref_alps_dsl") {
                    defaultValue = true
                    title = "Use the Alps DSL"
                    summary = "Kotlin domain-specific language for defining preferences"
                }
            }
        }
    }
}