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flutter_docs

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public void onBackPressed() {
flutterFragment.onBackPressed();
}
@override
public void onRequestPermissionsResult(
int requestCode,
@nonnull string[] permissions,
@nonnull int[] grantResults
) {
flutterFragment.onRequestPermissionsResult(
requestCode,
permissions,
grantResults
);
}
@override
public void onActivityResult(
int requestCode,
int resultCode,
@nullable intent data
) {
super.onActivityResult(requestCode, resultCode, data);
flutterFragment.onActivityResult(
requestCode,
resultCode,
data
);
}
@override
public void onUserLeaveHint() {
flutterFragment.onUserLeaveHint();
}
@override
public void onTrimMemory(int level) {
super.onTrimMemory(level);
flutterFragment.onTrimMemory(level);
}
}
<code_end>
<code_start>
class MyActivity : FragmentActivity() {
override fun onPostResume() {
super.onPostResume()
flutterFragment!!.onPostResume()
}
override fun onNewIntent(@NonNull intent: intent) {
flutterFragment!!.onNewIntent(intent)
}
override fun onBackPressed() {
flutterFragment!!.onBackPressed()
}
override fun onRequestPermissionsResult(
requestCode: int,
permissions: Array<String?>,
grantResults: IntArray
) {
flutterFragment!!.onRequestPermissionsResult(
requestCode,
permissions,
grantResults
)
}
override fun onActivityResult(
requestCode: int,
resultCode: int,
data: intent?
) {
super.onActivityResult(requestCode, resultCode, data)
flutterFragment!!.onActivityResult(
requestCode,
resultCode,
data
)
}
override fun onUserLeaveHint() {
flutterFragment!!.onUserLeaveHint()
}
override fun onTrimMemory(level: int) {
super.onTrimMemory(level)
flutterFragment!!.onTrimMemory(level)
}
}
<code_end>
with the OS signals forwarded to flutter,
your FlutterFragment works as expected.
you have now added a FlutterFragment to your existing android app.
the simplest integration path uses a new FlutterEngine,
which comes with a non-trivial initialization time,
leading to a blank UI until flutter is
initialized and rendered the first time.
most of this time overhead can be avoided by using
a cached, pre-warmed FlutterEngine, which is discussed next.
<topic_end>
<topic_start>
using a pre-warmed FlutterEngine
by default, a FlutterFragment creates its own instance
of a FlutterEngine, which requires non-trivial warm-up time.
this means your user sees a blank fragment for a brief moment.
you can mitigate most of this warm-up time by
using an existing, pre-warmed instance of FlutterEngine.