equivalent for "moveTaskToBack(true)" in flutter

Question

I want to keep the application running in background when pressing the back button, exactly like we press the home button. Im using flutter so i need an equivalent to "moveTaskToBack(true)" in android.

This does not solve your question but here some more background information https://stackoverflow.com/questions/41924890/how-do-i-run-code-in-the-background-even-with-the-screen-off — user1462442, Nov 08 '18 at 19:53

score 2 · Answer 1 · answered Mar 15 '20 at 18:54

03.2020 SOLUTION

You should wrap your Scaffold with WillPopScope, so the final code should look like as below:

var _androidAppRetain = MethodChannel("android_app_retain");

@override
Widget build(BuildContext context) {
return WillPopScope(
  onWillPop: () {
    if (Platform.isAndroid) {
      if (Navigator.of(context).canPop()) {
        return Future.value(true);
      } else {
        _androidAppRetain.invokeMethod("sendToBackground");
        return Future.value(false);
      }
    } else {
      return Future.value(true);
    }
  },
  child: Scaffold(
    ...
  ),
);
}

The code in the MainActivity() (android/app/src/main/kotlin/{yourProjectId}) should look like this:

class MainActivity: FlutterActivity() {

override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
    GeneratedPluginRegistrant.registerWith(flutterEngine);

    MethodChannel(flutterEngine.dartExecutor.binaryMessenger, "android_app_retain").apply {
        setMethodCallHandler { method, result ->
            if (method.method == "sendToBackground") {
                moveTaskToBack(true)
            }
        }
    }
}
}

equivalent for "moveTaskToBack(true)" in flutter

1 Answers1