Summary: Nested Classes | Methods | Inherited Methods

ActivityScenario

Kotlin |Java

public final class ActivityScenario
extends Object implements AutoCloseable, Closeable

java.lang.Object
↳	androidx.test.core.app.ActivityScenario<A extends android.app.Activity>

ActivityScenario provides APIs to start and drive an Activity's lifecycle state for testing. It works with arbitrary activities and works consistently across different versions of the Android framework.

The ActivityScenario API uses Lifecycle.State extensively. If you are unfamiliar with android.arch.lifecycle components, please read lifecycle before starting. It is crucial to understand the difference between Lifecycle.State and Lifecycle.Event.

moveToState(State) allows you to transition your Activity's state to Lifecycle.State.CREATED, Lifecycle.State.STARTED, Lifecycle.State.RESUMED, or Lifecycle.State.DESTROYED. There are two paths for an Activity to reach Lifecycle.State.CREATED: after Lifecycle.Event.ON_CREATE happens but before Lifecycle.Event.ON_START, or after Lifecycle.Event.ON_STOP. ActivityScenario always moves the Activity's state using the second path. The same applies to Lifecycle.State.STARTED.

Lifecycle.State.DESTROYED is the terminal state. You cannot move your Activity to other state once it reaches to that state. If you want to test recreation of Activity instance, use recreate().

ActivityScenario does't clean up device state automatically and may leave the activity keep running after the test finishes. Call close() in your test to clean up the state or use try-with-resources statement. This is optional but highly recommended to improve the stability of your tests. Also, consider using ActivityScenarioRule.

This class is a replacement of ActivityController in Robolectric and ActivityTestRule in ATSL.

Following are the example of common use cases.

Before:
   MyActivity activity = Robolectric.setupActivity(MyActivity.class);
   assertThat(activity.getSomething()).isEqualTo("something");

 After:
   try(ActivityScenario<MyActivity> scenario = ActivityScenario.launch(MyActivity.class)) {
     scenario.onActivity(activity -> {
       assertThat(activity.getSomething()).isEqualTo("something");
     });
   }

 Before:
   ActivityController<MyActivity> controller = Robolectric.buildActivity(MyActivity.class);
   controller.create().start().resume();  // Moves the activity state to State.RESUMED.
   controller.pause();    // Moves the activity state to State.STARTED. (ON_PAUSE is an event).
   controller.stop();     // Moves the activity state to State.CREATED. (ON_STOP is an event).
   controller.destroy();  // Moves the activity state to State.DESTROYED.

 After:
   try(ActivityScenario<MyActivity> scenario = ActivityScenario.launch(MyActivity.class)) {
     scenario.moveToState(State.RESUMED);    // Moves the activity state to State.RESUMED.
     scenario.moveToState(State.STARTED);    // Moves the activity state to State.STARTED.
     scenario.moveToState(State.CREATED);    // Moves the activity state to State.CREATED.
     scenario.moveToState(State.DESTROYED);  // Moves the activity state to State.DESTROYED.
   }

Summary

Nested classes
`interface`	`ActivityScenario.ActivityAction<A extends Activity>` ActivityAction interface should be implemented by any class whose instances are intended to be executed by the main thread.

Public methods
`void`	`close()` Finishes the managed activity and cleans up device's state.
`Instrumentation.ActivityResult`	`getResult()` Waits for the activity to be finished and returns the activity result.
`Lifecycle.State`	`getState()` Returns the current activity state.
`static <A extends Activity> ActivityScenario<A>`	`launch(Class<A> activityClass)` Launches an activity of a given class and constructs ActivityScenario with the activity.
`static <A extends Activity> ActivityScenario<A>`	`launch(Class<A> activityClass, Bundle activityOptions)`
`static <A extends Activity> ActivityScenario<A>`	`launch(Intent startActivityIntent)` Launches an activity by a given intent and constructs ActivityScenario with the activity.
`static <A extends Activity> ActivityScenario<A>`	`launch(Intent startActivityIntent, Bundle activityOptions)`
`ActivityScenario<A>`	`moveToState(Lifecycle.State newState)` Moves Activity state to a new state.
`ActivityScenario<A>`	`onActivity(ActivityAction<A> action)` Runs a given `action` on the current Activity's main thread.
`ActivityScenario<A>`	`recreate()` Recreates the Activity.

Inherited methods

From class


        
          java.lang.Object

`Object`	`clone()`
`boolean`	`equals(Object arg0)`
`void`	`finalize()`
`final Class<?>`	`getClass()`
`int`	`hashCode()`
`final void`	`notify()`
`final void`	`notifyAll()`
`String`	`toString()`
`final void`	`wait(long arg0, int arg1)`
`final void`	`wait(long arg0)`
`final void`	`wait()`

From interface


        
          java.lang.AutoCloseable

abstract void close()

From interface


        
          java.io.Closeable

abstract void close()

Public methods

close

public void close ()

Finishes the managed activity and cleans up device's state. This method blocks execution until the activity becomes Lifecycle.State.DESTROYED.

It is highly recommended to call this method after you test is done to keep the device state clean although this is optional.

You may call this method more than once. If the activity has been finished already, this method does nothing.

Avoid calling this method directly. Consider one of the following options instead:

Option 1, use try-with-resources:

  try (ActivityScenario<MyActivity> scenario = ActivityScenario.launch(MyActivity.class)) {
    // Your test code goes here.
  }

  Option 2, use ActivityScenarioRule:

 @Rule public ActivityScenarioRule<MyActivity> rule = new ActivityScenarioRule<>(MyActivity.class);

 @Testpublic void myTest() {
    ActivityScenario<MyActivity> scenario = rule.getScenario();
    // Your test code goes here.
  }

getResult

public Instrumentation.ActivityResult getResult ()

Waits for the activity to be finished and returns the activity result.

Note: This method doesn't call Activity.finish(). The activity must be finishing or finished otherwise this method will throws runtime exception after the timeout.

Example:
   ActivityScenario<MyActivity> scenario = ActivityScenario.launch(MyActivity.class);
   // Let's say MyActivity has a button that finishes itself.
   onView(withId(R.id.finish_button)).perform(click());
   assertThat(scenario.getResult().getResultCode()).isEqualTo(Activity.RESULT_OK);

Returns
`Instrumentation.ActivityResult`	activity result of the activity that managed by this scenario class.

getState

public Lifecycle.State getState ()

Returns the current activity state. The possible states are Lifecycle.State.CREATED, Lifecycle.State.STARTED, Lifecycle.State.RESUMED, and Lifecycle.State.DESTROYED.

This method cannot be called from the main thread except in Robolectric tests.

Returns
`Lifecycle.State`

launch

public static ActivityScenario<A> launch (Class<A> activityClass)

Launches an activity of a given class and constructs ActivityScenario with the activity. Waits for the lifecycle state transitions to be complete. Typically the initial state of the activity is Lifecycle.State.RESUMED but can be in another state. For instance, if your activity calls Activity.finish() from your Activity.onCreate(Bundle), the state is Lifecycle.State.DESTROYED when this method returns.

If you need to supply parameters to the start activity intent, use launch(Intent).

This method cannot be called from the main thread except in Robolectric tests.

Parameters
`activityClass`	`Class`: an activity class to launch

Returns
`ActivityScenario<A>`	ActivityScenario which you can use to make further state transitions

Throws
`AssertionError`	if the lifecycle state transition never completes within the timeout

launch

public static ActivityScenario<A> launch (Class<A> activityClass, 
                Bundle activityOptions)

Parameters
`activityClass`	`Class`
`activityOptions`	`Bundle`: an activity options bundle to be passed along with the intent to start activity.

Returns
`ActivityScenario<A>`

See also:

launch(Class)

launch

public static ActivityScenario<A> launch (Intent startActivityIntent)

Launches an activity by a given intent and constructs ActivityScenario with the activity. Waits for the lifecycle state transitions to be complete. Typically the initial state of the activity is Lifecycle.State.RESUMED but can be in another state. For instance, if your activity calls Activity.finish() from your Activity.onCreate(Bundle), the state is Lifecycle.State.DESTROYED when this method returns.

This method cannot be called from the main thread except in Robolectric tests.

Parameters
`startActivityIntent`	`Intent`: an intent to start the activity

Returns
`ActivityScenario<A>`	ActivityScenario which you can use to make further state transitions

Throws
`AssertionError`	if the lifecycle state transition never completes within the timeout

launch

public static ActivityScenario<A> launch (Intent startActivityIntent, 
                Bundle activityOptions)

Parameters
`startActivityIntent`	`Intent`
`activityOptions`	`Bundle`: an activity options bundle to be passed along with the intent to start activity.

Returns
`ActivityScenario<A>`

See also:

launch(Intent)

moveToState

public ActivityScenario<A> moveToState (Lifecycle.State newState)

Moves Activity state to a new state.

If a new state and current state are the same, it does nothing. It accepts Lifecycle.State.CREATED, Lifecycle.State.STARTED, Lifecycle.State.RESUMED, and Lifecycle.State.DESTROYED.

Lifecycle.State.DESTROYED is the terminal state. You cannot move the state to other state after the activity reaches that state.

The activity must be at the top of the back stack (excluding internal facilitator activities started by this library), otherwise AssertionError may be thrown. If the activity starts another activity (such as DialogActivity), make sure you close these activities and bring back the original activity foreground before you call this method.

This method cannot be called from the main thread except in Robolectric tests.

Parameters
`newState`	`Lifecycle.State`

Returns
`ActivityScenario<A>`

Throws
`IllegalArgumentException`	if unsupported `newState` is given
`IllegalStateException`	if Activity is destroyed, finished or finishing
`AssertionError`	if Activity never becomes requested state

onActivity

public ActivityScenario<A> onActivity (ActivityAction<A> action)

Runs a given action on the current Activity's main thread.

Note that you should never keep Activity reference passed into your action because it can be recreated at anytime during state transitions.

Parameters
`action`	`ActivityAction`

Returns
`ActivityScenario<A>`

Throws
`IllegalStateException`	if Activity is destroyed, finished or finishing

recreate

public ActivityScenario<A> recreate ()

Recreates the Activity.

A current Activity will be destroyed after its data is saved into Bundle with Activity.onSaveInstanceState(Bundle), then it creates a new Activity with the saved Bundle. After this method call, it is ensured that the Activity state goes back to the same state as its previous state.

This method cannot be called from the main thread except in Robolectric tests.

Returns
`ActivityScenario<A>`

Throws
`IllegalStateException`	if Activity is destroyed, finished or finishing
`AssertionError`	if Activity never be re-created

ActivityScenario

Summary

Nested classes

Public methods

Inherited methods

Public methods

close

getResult

getState

launch

launch

launch

launch

moveToState

onActivity

recreate