在Kotlin,使用 共有项目代码>可通过以下方式简化。
class Prefs(context: Context) {
companion object {
private const val PREFS_FILENAME = "app_prefs"
private const val KEY_MY_STRING = "my_string"
private const val KEY_MY_BOOLEAN = "my_boolean"
private const val KEY_MY_ARRAY = "string_array"
}
private val sharedPrefs: SharedPreferences =
context.getSharedPreferences(PREFS_FILENAME, Context.MODE_PRIVATE)
var myString: String
get() = sharedPrefs.getString(KEY_MY_STRING, "") ?: ""
set(value) = sharedPrefs.edit { putString(KEY_MY_STRING, value) }
var myBoolean: Boolean
get() = sharedPrefs.getBoolean(KEY_MY_BOOLEAN, false)
set(value) = sharedPrefs.edit { putBoolean(KEY_MY_BOOLEAN, value) }
var myStringArray: Array<String>
get() = sharedPrefs.getStringSet(KEY_MY_ARRAY, emptySet())?.toTypedArray()
?: emptyArray()
set(value) = sharedPrefs.edit { putStringSet(KEY_MY_ARRAY, value.toSet()) }
此处,commdprefs.edit{...}
由roid岩心kt图书馆提供,并通过在座标<条码>上添加“依赖代码”执行“androidx.分:核心-ktx:1.0.2”。
You can get the instance of SharedPreferences
by using code:
val prefs = Prefs(context)
此外,您可创建<条码>Singleton,<条码>,并在附件内任何地方使用。
val prefs: Prefs by lazy {
Prefs(App.instance)
}
App
App.kt
class App:Application() {
companion object {
lateinit var instance: App
}
override fun onCreate() {
super.onCreate()
instance = this
}
}
AndroidManifest.xml
<?xml version="1.0" encoding="utf-8"?>
<manifest .....
<application
android:name=".App"
....
www.un.org/Depts/DGACM/index_spanish.htm 例:
// get stored value
val myString = prefs.myString
// store value
prefs.myString = "My String Value"
// get stored array
val myStringArray = prefs.myStringArray
// store array
prefs.myStringArray = arrayOf("String 1","String 2","String 3")