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Flutter_Documentation

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.findFragmentByTag(TAG_FLUTTER_FRAGMENT) as FlutterFragment?
// Create and attach a FlutterFragment if one does not exist.
if (flutterFragment == null) {
var newFlutterFragment = FlutterFragment.createDefault()
flutterFragment = newFlutterFragment
fragmentManager
.beginTransaction()
.add(
R.id.fragment_container,
newFlutterFragment,
TAG_FLUTTER_FRAGMENT
)
.commit()
}
}
}<code_end>
The previous code is sufficient to render a Flutter UI
that begins with a call to your main() Dart entrypoint,
an initial Flutter route of /, and a new FlutterEngine.
However, this code is not sufficient to achieve all expected
Flutter behavior. Flutter depends on various OS signals that
must be forwarded from your host Activity to FlutterFragment.
These calls are shown in the following example:
<code_start>public class MyActivity extends FragmentActivity {
@Override
public void onPostResume() {
super.onPostResume();
flutterFragment.onPostResume();
}
@Override
protected void onNewIntent(@NonNull Intent intent) {
flutterFragment.onNewIntent(intent);
}
@Override
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)