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helper for shared prefs - kotlin version - Final implementation
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| object PreferenceHelper { | |
| fun defaultPrefs(context: Context): SharedPreferences | |
| = PreferenceManager.getDefaultSharedPreferences(context) | |
| fun customPrefs(context: Context, name: String): SharedPreferences | |
| = context.getSharedPreferences(name, Context.MODE_PRIVATE) | |
| inline fun SharedPreferences.edit(operation: (SharedPreferences.Editor) -> Unit) { | |
| val editor = this.edit() | |
| operation(editor) | |
| editor.apply() | |
| } | |
| /** | |
| * puts a key value pair in shared prefs if doesn't exists, otherwise updates value on given [key] | |
| */ | |
| operator fun SharedPreferences.set(key: String, value: Any?) { | |
| when (value) { | |
| is String? -> edit({ it.putString(key, value) }) | |
| is Int -> edit({ it.putInt(key, value) }) | |
| is Boolean -> edit({ it.putBoolean(key, value) }) | |
| is Float -> edit({ it.putFloat(key, value) }) | |
| is Long -> edit({ it.putLong(key, value) }) | |
| else -> throw UnsupportedOperationException("Not yet implemented") | |
| } | |
| } | |
| /** | |
| * finds value on given key. | |
| * [T] is the type of value | |
| * @param defaultValue optional default value - will take null for strings, false for bool and -1 for numeric values if [defaultValue] is not specified | |
| */ | |
| operator inline fun <reified T : Any> SharedPreferences.get(key: String, defaultValue: T? = null): T? { | |
| return when (T::class) { | |
| String::class -> getString(key, defaultValue as? String) as T? | |
| Int::class -> getInt(key, defaultValue as? Int ?: -1) as T? | |
| Boolean::class -> getBoolean(key, defaultValue as? Boolean ?: false) as T? | |
| Float::class -> getFloat(key, defaultValue as? Float ?: -1f) as T? | |
| Long::class -> getLong(key, defaultValue as? Long ?: -1) as T? | |
| else -> throw UnsupportedOperationException("Not yet implemented") | |
| } | |
| } | |
| } |
Hi krupalshah,
How can I use this code in Kotlin 1.3.0 ?
with this code i couldn't
val prefs = defaultPrefs(this) prefs[Consts.SharedPrefs.KEY] = "any_type_of_value" //setter val value: String? = prefs[Consts.SharedPrefs.KEY] //getter
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not working in kotlin 1.2.6
Code:-
val prefs = PreferenceHelper.defaultPrefs(this)
//set any type of value in prefs
prefs[PREFUSERID] = "name"
Receive this error
@InlineOnly public inline operator fun kotlin.text.StringBuilder /* = java.lang.StringBuilder */.set(index: Int, value: Char): Unit defined in kotlin.text