【Android,Jetpack】如何判断datastore包含某个Preferebces.Key

1. 如何判断datastore包含某个Preferebces.Key

直接贴上代码

    inline fun <reified T> contains(key: String): Boolean =
        runBlocking { return@runBlocking dataStore.data.map { it.contains(getPreferencesKey<T>(key)) }.first() }

• 获取preferencesKey类型的代码如下

    inline fun <reified T> getPreferencesKey(key: String): Preferences.Key<out Any> =
        when (T::class) {
            String::class -> stringPreferencesKey(key)//putString(key, value)
            Boolean::class -> booleanPreferencesKey(key)
            Int::class -> intPreferencesKey(key)
            Long::class -> longPreferencesKey(key)
            Float::class -> floatPreferencesKey(key)
            Double::class -> doublePreferencesKey(key)
            else -> throw IllegalArgumentException("This type cannot be saved to the Data Store")
        }