Package io.flutter.embedding.android

Class FlutterActivity.NewEngineInGroupIntentBuilder

java.lang.Object

io.flutter.embedding.android.FlutterActivity.NewEngineInGroupIntentBuilder

Enclosing class:

FlutterActivity

public static class FlutterActivity.NewEngineInGroupIntentBuilder
extends Object

Builder to create an Intent that launches a FlutterActivity with a new FlutterEngine created by FlutterEngineGroup#createAndRunEngine.

Constructor Summary

Constructors

Constructor	Description
NewEngineInGroupIntentBuilder(Class<? extends FlutterActivity> activityClass, String engineGroupId)	Constructor that allows this NewEngineInGroupIntentBuilder to be used by subclasses of FlutterActivity.

Method Summary

Modifier and Type	Method	Description
FlutterActivity.NewEngineInGroupIntentBuilder	backgroundMode(FlutterActivityLaunchConfigs.BackgroundMode backgroundMode)	The mode of FlutterActivity's background, either FlutterActivityLaunchConfigs.BackgroundMode.opaque or FlutterActivityLaunchConfigs.BackgroundMode.transparent.
Intent	build(Context context)	Creates and returns an Intent that will launch a FlutterActivity with the desired configuration.
FlutterActivity.NewEngineInGroupIntentBuilder	dartEntrypoint(String dartEntrypoint)	The Dart entrypoint that will be executed in the newly created FlutterEngine as soon as the Dart snapshot is loaded.
FlutterActivity.NewEngineInGroupIntentBuilder	initialRoute(String initialRoute)	The initial route that a Flutter app will render in this FlutterActivity, defaults to "/".

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

NewEngineInGroupIntentBuilder

public NewEngineInGroupIntentBuilder(@NonNull
 Class<? extends FlutterActivity> activityClass,
 @NonNull
 String engineGroupId)

Constructor that allows this NewEngineInGroupIntentBuilder to be used by subclasses of FlutterActivity.

Subclasses of FlutterActivity should provide their own static version of FlutterActivity.withNewEngineInGroup(java.lang.String), which returns an instance of NewEngineInGroupIntentBuilder constructed with a Class reference to the FlutterActivity subclass, e.g.:

return new NewEngineInGroupIntentBuilder(MyFlutterActivity.class, cacheedEngineGroupId);

 // Create a FlutterEngineGroup, such as in the onCreate method of the Application.
 FlutterEngineGroup engineGroup = new FlutterEngineGroup(this);
 FlutterEngineGroupCache.getInstance().put("my_cached_engine_group_id", engineGroup);

 // Create a NewEngineInGroupIntentBuilder that would build an intent to start my custom FlutterActivity subclass.
 FlutterActivity.NewEngineInGroupIntentBuilder intentBuilder =
     new FlutterActivity.NewEngineInGroupIntentBuilder(
           MyFlutterActivity.class,
           app.engineGroupId);
 intentBuilder.dartEntrypoint("main")
     .initialRoute("/custom/route")
     .backgroundMode(BackgroundMode.transparent);
 startActivity(intentBuilder.build(context));
 

Parameters:

activityClass - A subclass of FlutterActivity.

engineGroupId - The engine group id.

Method Details

dartEntrypoint

@NonNull
public FlutterActivity.NewEngineInGroupIntentBuilder dartEntrypoint(@NonNull
 String dartEntrypoint)

The Dart entrypoint that will be executed in the newly created FlutterEngine as soon as the Dart snapshot is loaded. Default to "main".

Parameters:

dartEntrypoint - The dart entrypoint's name

Returns:

The engine group intent builder

initialRoute

@NonNull
public FlutterActivity.NewEngineInGroupIntentBuilder initialRoute(@NonNull
 String initialRoute)

The initial route that a Flutter app will render in this FlutterActivity, defaults to "/".

Parameters:

initialRoute - The route.

Returns:

The engine group intent builder.

backgroundMode

@NonNull
public FlutterActivity.NewEngineInGroupIntentBuilder backgroundMode(@NonNull
 FlutterActivityLaunchConfigs.BackgroundMode backgroundMode)

The mode of FlutterActivity's background, either FlutterActivityLaunchConfigs.BackgroundMode.opaque or FlutterActivityLaunchConfigs.BackgroundMode.transparent.

The default background mode is FlutterActivityLaunchConfigs.BackgroundMode.opaque.

Choosing a background mode of FlutterActivityLaunchConfigs.BackgroundMode.transparent will configure the inner FlutterView of this FlutterActivity to be configured with a FlutterTextureView to support transparency. This choice has a non-trivial performance impact. A transparent background should only be used if it is necessary for the app design being implemented.

A FlutterActivity that is configured with a background mode of FlutterActivityLaunchConfigs.BackgroundMode.transparent must have a theme applied to it that includes the following property: <item name="android:windowIsTranslucent">true</item>.

Parameters:

backgroundMode - The background mode.

Returns:

The engine group intent builder.

build

@NonNull
public Intent build(@NonNull
 Context context)

Creates and returns an Intent that will launch a FlutterActivity with the desired configuration.

Parameters:

context - The context. e.g. An Activity.

Returns:

The intent.