How to use Android Fragment in Flutter plugin?

问题

I need to wrap SDK created in native code iOS/Android into Flutter. On Android side there is some functionality where my Fragment or Activity needs to extend SDK Fragment or Activity to implement custom view. My question is how I can wrap SDK Fragment or Activity in Flutter plugin and let extends this on flutter project side using my plugin ? I other words I would like to have a Widget which can extend Fragment or Activity using my plugin to have ability to show Widget ui in SDK.

Using FlutterFragment, FlutterActivity in plugin is right way ?

I mean: Flutter project (Widget) <-> Flutter plugin (FlutterFragment or FlutterActivity attached to native SDK Fragment or Activity)

If not what is a possible solution ?

回答1:

I was facing the same problem and here is my solution:

Implement a FlutterPlugin that supports ActivityAware, refer to this FlutterPlugin with ActivityAware on how to cache the Activity, as well as MethodCallHandler (to communicate with the FlutterWidget app).

Implement a MethodCall e.g. SHOW_NATIVE_FRAGMENT in which it will attach the native fragment. Note: need to dynamically add a View as a container for the fragment

     int id = 0x123456;
     ViewGroup.LayoutParams vParams = new FrameLayout.LayoutParams(
             ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT
     );
     FrameLayout container = new FrameLayout(context);
     container.setLayoutParams(vParams);
     container.setId(id);
     activity.addContentView(container, vParams);

Then attach the Fragment to the Activity

        FragmentManager fm = ((FragmentActivity) activity).getSupportFragmentManager();
        fm.beginTransaction()
            .replace(id, nativeFragment)
            .commitAllowingStateLoss();

When you are done with the Fragment, remember to call the MethodChannel.Result with either success() or error() otherwise, the FlutterWidget will be blocked forever.
On the FlutterWidget side, call the MethodChannel with

        static Future<void> showNativeFragment() async {
            await _channel.invokeMethod("SHOW_NATIVE_FRAGMENT");
        }

And also make sure that your FlutterWidget's application Activity extends FlutterFragmentActivity.

来源：https://stackoverflow.com/questions/62746709/how-to-use-android-fragment-in-flutter-plugin

标签

android

Flutter

android-fragments

dart