CollectionNavType

Added in 2.8.0

Kotlin |Java

abstract class CollectionNavType<T : Any?> : NavType

kotlin.Any
↳	androidx.navigation.NavType
	↳	androidx.navigation.CollectionNavType

A NavType for Collection such as arrays, lists, maps.

Parameters
`<T : Any?>`	the type of the data that is supported by this NavType

Summary

Public constructors
`<T : Any?> CollectionNavType(isNullableAllowed: Boolean)`

Public functions
`abstract T`	`emptyCollection()` Create and return an empty collection of type `T`
`abstract List<String>`	`serializeAsValues(value: T)` Serialize a value of this NavType into a list of String.

`abstract operator T?`	`get(bundle: SavedState, key: String)` Get a value of this type from the `bundle`
`abstract T`	`parseValue(value: String)` Parse a value of this type from a String.
`open T`	`parseValue(value: String, previousValue: T)` Parse a value of this type from a String and then combine that parsed value with the given previousValue of the same type to provide a new value that contains both the new and previous value.
`abstract Unit`	`put(bundle: SavedState, key: String, value: T)` Put a value of this type in the `bundle`
`open String`	`serializeAsValue(value: T)` Serialize a value of this NavType into a String.
`open String`	`toString()`
`open Boolean`	`valueEquals(value: T, other: T)` Compares two values of type `T` and returns true if values are equal.

`open Boolean`	`isNullableAllowed` Check if an argument with this type can hold a null value.
`open String`	`name` The name of this type.

<T : Any?> CollectionNavType(isNullableAllowed: Boolean)

Parameters
`<T : Any?>`	the type of the data that is supported by this NavType
`isNullableAllowed: Boolean`	whether the argument of this type can hold a null value

Added in 2.8.0

abstract fun emptyCollection(): T

Create and return an empty collection of type T

For example, T of type List should return emptyList().

Added in 2.8.0

abstract fun serializeAsValues(value: T): List<String>

Serialize a value of this NavType into a list of String.

Each element in the collection should be converted to an individual String element of the returned list.

Note: Elements should be encoded with Uri.encode

Parameters
`value: T`	a value of this NavType

Returns
`List<String>`	List containing encoded and serialized String representation of `value`