build.gradle
buildscript { repositories { ... maven { url 'https://dl.bintray.com/boxresin/maven/' } // Add this line. } } allprojects { repositories { ... maven { url 'https://dl.bintray.com/boxresin/maven/' } // Add this line. } }app/build.gradle
dependencies { ... implementation 'boxresin.android:preference:0.2.0' // Add this line. }// Define a key. val key = StringKey(keyName = "user_id", defaultValue = "none") // Auto-casting as String, because 'key' is StringKey val userId: String = Setting[key] // Set value (only String type is allowed). Setting[key] = "test" // Error Setting[key] = 1234There are also StringKey, IntKey, LongKey, FloatKey, and BooleanKey.