CollectionNavType

Added in 2.8.0

Kotlin |Java

public abstract class CollectionNavType<T extends Object> extends NavType

java.lang.Object
↳	androidx.navigation.NavType
	↳	androidx.navigation.CollectionNavType

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

Parameters
`<T extends Object>`	the type of the data that is supported by this NavType

Summary

Public constructors
`<T extends Object> CollectionNavType(boolean isNullableAllowed)`

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

`abstract T`	`get(@NonNull SavedState bundle, @NonNull String key)` Get a value of this type from the `bundle`
`@NonNull String`	`getName()` The name of this type.
`boolean`	`isNullableAllowed()` Check if an argument with this type can hold a null value.
`abstract @NonNull T`	`parseValue(@NonNull String value)` Parse a value of this type from a String.
`@NonNull T`	`parseValue(@NonNull String value, @NonNull T previousValue)` 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 void`	`put(@NonNull SavedState bundle, @NonNull String key, @NonNull T value)` Put a value of this type in the `bundle`
`@NonNull String`	`serializeAsValue(@NonNull T value)` Serialize a value of this NavType into a String.
`@NonNull String`	`toString()`
`boolean`	`valueEquals(@NonNull T value, @NonNull T other)` Compares two values of type `T` and returns true if values are equal.

public <T extends Object> CollectionNavType(boolean isNullableAllowed)

Parameters
`<T extends Object>`	the type of the data that is supported by this NavType
`boolean isNullableAllowed`	whether the argument of this type can hold a null value

Added in 2.8.0

public abstract @NonNull T emptyCollection()

Create and return an empty collection of type T

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

Added in 2.8.0

public abstract @NonNull List<@NonNull String> serializeAsValues(@NonNull T value)

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
`@NonNull T value`	a value of this NavType

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