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<code_end>
by setting the initial route of the navigation channel, the associated
FlutterEngine displays the desired route upon initial execution of the
runApp() dart function.
changing the initial route property of the navigation channel
after the initial execution of runApp() has no effect.
developers who would like to use the same FlutterEngine
between different activitys and fragments and switch
the route between those displays need to set up a method channel and
explicitly instruct their dart code to change navigator routes.
<topic_end>
<topic_start>
add a translucent flutter screen
most full-screen flutter experiences are opaque.
however, some apps would like to deploy a flutter
screen that looks like a modal, for example,
a dialog or bottom sheet. flutter supports translucent
FlutterActivitys out of the box.
to make your FlutterActivity translucent,
make the following changes to the regular process of
creating and launching a FlutterActivity.
<topic_end>
<topic_start>
step 1: use a theme with translucency
android requires a special theme property for activitys that render
with a translucent background. create or update an android theme with the
following property:
then, apply the translucent theme to your FlutterActivity.
your FlutterActivity now supports translucency.
next, you need to launch your FlutterActivity
with explicit transparency support.
<topic_end>
<topic_start>
step 2: start FlutterActivity with transparency
to launch your FlutterActivity with a transparent background,
pass the appropriate BackgroundMode to the IntentBuilder:
<code_start>
// using a new FlutterEngine.
startActivity(
FlutterActivity
.withnewengine()
.backgroundmode(flutteractivitylaunchconfigs.backgroundmode.transparent)
.build(context)
);
// using a cached FlutterEngine.
startActivity(
FlutterActivity
.withcachedengine("my_engine_id")
.backgroundmode(flutteractivitylaunchconfigs.backgroundmode.transparent)
.build(context)
);
<code_end>
<code_start>
// using a new FlutterEngine.
startActivity(
FlutterActivity
.withnewengine()
.backgroundmode(flutteractivitylaunchconfigs.backgroundmode.transparent)
.build(this)
);
// using a cached FlutterEngine.
startActivity(
FlutterActivity
.withcachedengine("my_engine_id")
.backgroundmode(flutteractivitylaunchconfigs.backgroundmode.transparent)
.build(this)
);
<code_end>
you now have a FlutterActivity with a transparent background.
info note
make sure that your flutter content also includes a
translucent background. if your flutter UI paints a
solid background color, then it still appears as
though your FlutterActivity has an opaque background.
<topic_end>
<topic_start>
add a flutter fragment to an android app
this guide describes how to add a flutter fragment to an existing
android app. in android, a fragment represents a modular
piece of a larger UI. a fragment might be used to present
a sliding drawer, tabbed content, a page in a ViewPager,
or it might simply represent a normal screen in a
single-Activity app. flutter provides a FlutterFragment
so that developers can present a flutter experience any place
that they can use a regular fragment.
if an activity is equally applicable for your application needs,
consider using a FlutterActivity instead of a
FlutterFragment, which is quicker and easier to use.
FlutterFragment allows developers to control the following
details of the flutter experience within the fragment:
FlutterFragment also comes with a number of calls that
must be forwarded from its surrounding activity.
these calls allow flutter to react appropriately to OS events.
all varieties of FlutterFragment, and its requirements,
are described in this guide.
<topic_end>
<topic_start>
add a FlutterFragment to an activity with a new FlutterEngine