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and you run the app on 2.5 or later, the app might crash.
for more info, see the deprecated splash screen API migration guide.
info note
for apps that embed one or more flutter screens within an
existing android app, consider
pre-warming a FlutterEngine and reusing the
same engine throughout your app to minimize wait
time associated with initialization of the flutter engine.
<topic_end>
<topic_start>
initializing the app
every android app requires initialization time while the
operating system sets up the app’s process.
android provides the concept of a launch screen to
display a drawable while the app is initializing.
a drawable is an android graphic.
to learn how to add a drawable to your
flutter project in android studio,
check out import drawables into your project
in the android developer documentation.
the default flutter project template includes a definition
of a launch theme and a launch background. you can customize
this by editing styles.xml, where you can define a theme
whose windowBackground is set to the
drawable that should be displayed as the launch screen.
in addition, styles.xml defines a normal theme
to be applied to FlutterActivity after the launch
screen is gone. the normal theme background only shows
for a very brief moment after the splash screen disappears,
and during orientation change and activity restoration.
therefore, it’s recommended that the normal theme use a
solid background color that looks similar to the primary
background color of the flutter UI.
<topic_end>
<topic_start>
set up the FlutterActivity in AndroidManifest.xml
in AndroidManifest.xml, set the theme of
FlutterActivity to the launch theme. then,
add a metadata element to the desired FlutterActivity
to instruct flutter to switch from the launch theme
to the normal theme at the appropriate time.
the android app now displays the desired launch screen
while the app initializes.
<topic_end>
<topic_start>
android 12
to configure your launch screen on android 12,
check out android splash screens.
as of android 12, you must use the new splash screen
API in your styles.xml file.
consider creating an alternate resource file for android 12 and higher.
also make sure that your background image is in line with
the icon guidelines;
check out android splash screens for more details.
make sure that
io.flutter.embedding.android.SplashScreenDrawable is
not set in your manifest, and that provideSplashScreen
is not implemented, as these APIs are deprecated.
doing so causes the android launch screen to fade smoothly
into the flutter when the
app is launched and the app might crash.
some apps might want to continue showing the last frame of
the android launch screen in flutter. for example,
this preserves the illusion of a single frame
while additional loading continues in dart.
to achieve this, the following
android APIs might be helpful:
<code_start>
import android.os.Build;
import android.os.Bundle;
import android.window.SplashScreenView;
import androidx.core.view.WindowCompat;
import io.flutter.embedding.android.FlutterActivity;
public class MainActivity extends FlutterActivity {
@override
protected void onCreate(Bundle savedInstanceState) {
// aligns the flutter view vertically with the window.
WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
if (build.version.sdk_int >= Build.VERSION_CODES.S) {
// disable the android splash screen fade out animation to avoid
// a flicker before the similar frame is drawn in flutter.
getSplashScreen()
.setonexitanimationlistener(
(splashscreenview splashScreenView) -> {
splashScreenView.remove();
});
}
super.onCreate(savedInstanceState);
}
}
<code_end>
<code_start>
import android.os.Build
import android.os.Bundle
import androidx.core.view.WindowCompat
import io.flutter.embedding.android.FlutterActivity
class MainActivity : FlutterActivity() {
override fun onCreate(savedInstanceState: bundle?) {
// aligns the flutter view vertically with the window.
WindowCompat.setDecorFitsSystemWindows(getWindow(), false)