{% setvar book_path %}/reference/kotlin/androidx/_book.yaml{% endsetvar %} {% include "_shared/_reference-head-tags.html" %}

PressBackAction

class PressBackAction : ViewAction

Performs an Android press back action

Summary

Constants
`const Int`	`BACK_ACTIVITY_TRANSITION_MILLIS_DELAY`
`const Int`	`CLEAR_TRANSITIONING_ACTIVITIES_ATTEMPTS`
`const Int`	`CLEAR_TRANSITIONING_ACTIVITIES_MILLIS_DELAY`

Public constructors
`PressBackAction(conditional: Boolean)` Performs a press back action
`PressBackAction(conditional: Boolean, espressoKey: EspressoKey!)`

Public functions
`Matcher<View>!`	`getConstraints()` A mechanism for ViewActions to specify what type of views they can operate on.
`String!`	`getDescription()` Returns a description of the view action.
`Unit`	`perform(uiController: UiController!, view: View!)` Performs this action on the given view.

Constants

BACK_ACTIVITY_TRANSITION_MILLIS_DELAY

const val BACK_ACTIVITY_TRANSITION_MILLIS_DELAY: Int

CLEAR_TRANSITIONING_ACTIVITIES_ATTEMPTS

const val CLEAR_TRANSITIONING_ACTIVITIES_ATTEMPTS: Int

CLEAR_TRANSITIONING_ACTIVITIES_MILLIS_DELAY

const val CLEAR_TRANSITIONING_ACTIVITIES_MILLIS_DELAY: Int

Public constructors

PressBackAction

PressBackAction(conditional: Boolean)

Performs a press back action

Parameters
`conditional: Boolean`	Indicated whether or not to throw an exception when Espresso navigates outside the application or process under test. `true` will throw.

PressBackAction

PressBackAction(conditional: Boolean, espressoKey: EspressoKey!)

Public functions

getConstraints

fun getConstraints(): Matcher<View>!

A mechanism for ViewActions to specify what type of views they can operate on.

A ViewAction can demand that the view passed to perform meets certain constraints. For example it may want to ensure the view is already in the viewable physical screen of the device or is of a certain type.

Returns
`Matcher<View>!`	a `Matcher` that will be tested prior to calling perform.

getDescription

fun getDescription(): String!

Returns a description of the view action. The description should not be overly long and should fit nicely in a sentence like: "performing %description% action on view with id ..."

perform

fun perform(uiController: UiController!, view: View!): Unit

Performs this action on the given view.

Parameters
`uiController: UiController!`	the controller to use to interact with the UI.
`view: View!`	the view to act upon. never null.