Extension functions for getting and putting values in SharedPreferences:

SharedPreferences

inline fun <reified T : Any> SharedPreferences.get(key: String, defaultValue: T? = null): T? {
    val value = when (T::class) {
        String::class -> getString(key, defaultValue as? String) as T?
        Int::class -> getInt(key, defaultValue as? Int ?: -1) as T?
        Long::class -> getLong(key, defaultValue as? Long ?: -1L) as T?
        Float::class -> getFloat(key, defaultValue as? Float ?: -1f) as T?
        Boolean::class -> getBoolean(key, defaultValue as? Boolean ?: false) as T?
        else -> throw IllegalArgumentException("Unsupported type: ${T::class.java}")
    }
    return value
}

inline fun <reified T : Any> SharedPreferences.put(key: String, value: T?) {
    val editor = edit()
    when (T::class) {
        String::class -> editor.putString(key, value as? String)
        Int::class -> editor.putInt(key, value as? Int ?: -1)
        Long::class -> editor.putLong(key, value as? Long ?: -1L)
        Float::class -> editor.putFloat(key, value as? Float ?: -1f)
        Boolean::class -> editor.putBoolean(key, value as? Boolean ?: false)
        else -> throw IllegalArgumentException("Unsupported type: ${T::class.java}")
    }
    editor.apply()
}