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| import android.content.SharedPreferences | |
| import kotlin.properties.ReadWriteProperty | |
| import kotlin.reflect.KProperty | |
| class Preference<T>( | |
| private val preferences: SharedPreferences, | |
| private val name: String, | |
| private val default: T | |
| ) : ReadWriteProperty<Any?, T> { | |
| override fun getValue(thisRef: Any?, property: KProperty<*>): T = findPreference(name, default) | |
| override fun setValue(thisRef: Any?, property: KProperty<*>, value: T) { | |
| putPreference(name, value) | |
| } | |
| private fun <T> findPreference(name: String, default: T): T = with(preferences) { | |
| val res: Any = when (default) { | |
| is Long -> getLong(name, default) | |
| is String -> getString(name, default) | |
| is Int -> getInt(name, default) | |
| is Boolean -> getBoolean(name, default) | |
| is Float -> getFloat(name, default) | |
| else -> throw IllegalArgumentException("This type cannot be saved into Preferences") | |
| } | |
| res as? T ?: default | |
| } | |
| private fun <T> putPreference(name: String, value: T) = with(preferences.edit()) { | |
| when (value) { | |
| is Long -> putLong(name, value) | |
| is String -> putString(name, value) | |
| is Int -> putInt(name, value) | |
| is Boolean -> putBoolean(name, value) | |
| is Float -> putFloat(name, value) | |
| else -> throw IllegalArgumentException("This type cannot be saved into Preferences") | |
| }.apply() | |
| } | |
| } | |
| // SAMPLE | |
| // before you need ref to SharedPreference | |
| var myValue: String by Preference( | |
| preference, | |
| "KEY", | |
| "DEFAULT_VALUE" | |
| ) | |
| // put new value to shared pref | |
| myValue = "NEW_VALUE" |
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