Android manages multiple flutterfragments flutter management system

Flutter state framework comparison and selection

Preface

As business needs continue to iterate, status management becomes particularly important. Data-oriented page updates are an extremely effective method, but more and more businesses will lead to more and more dependencies between modules.

This picture reflects that when the page is complex, if there is centralized state control, it will appear messy and disorganized, which will be a headache especially when locating problems. Another important reason is that Flutter will report an error when debugging. It will start reporting from runApp. If there is no corresponding error output by the status manager, it is difficult to locate which data problem is caused.

This time we mainly compare the usage and global state management of Flutter-Redux and Fish-Redux to help choose the corresponding state management framework.

flutter-redux

Introduction

flutter-redux, as the official plug-in of flutter, ensures stability and continuity of post-maintenance. In terms of functionality, Flutter’s original programming method has not changed much, except that the management and refresh of data have been encapsulated.

Instructions

1. Add a global Store at the App level

final store = Store<CountState>(countReducer, initialState: CountState.initState());
  runApp(new MyApp(store));

2. Create State

@immutable
class CountState {
  final int _count;
  get count => _count;

  CountState(this._count);

  CountState.initState() : _count = 0;
}

3. Create Action

class CountAction {}

4. Create reducer

final countReducer = combineReducers<CountState>([
  TypedReducer<CountState, CountAction>(_incrementCount),
]);

CountState _incrementCount(CountState state, action) {
  return CountState(state.count + 1);
}

5. Use Connect to convert state->viewModel in the page

Center(
        child: StoreConnector<CountState,int>(
          converter: (store) => store.state.count,
          builder: (context, count) {
            return Text(
              count.toString(),
              style: Theme.of(context).textTheme.display1,
            );
          },
        ),
      )

6. Other pages call the same state

Scaffold(
      appBar: AppBar(
        title: Text('Under Screen'),
      ),
      body: Center(
        child: new Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            new Text(
              'You have pushed the button this many times:',
            ),
            StoreConnector<CountState,int>(
              converter: (store) => store.state.count,
              builder: (context, count) {
                return Text(
                  count.toString(),
                  style: Theme.of(context).textTheme.display1,
                );
              },
            ),
          ],
        ),
      ),
      floatingActionButton: StoreConnector<CountState,VoidCallback>(

        converter: (store) {
          return () => store.dispatch(CountAction());
        },
        builder: (context, callback) {
          return FloatingActionButton(
            onPressed: callback,
            child: Icon(Icons.add),
          );
        },
      ),
    )

7. Whether to update the page?

@override
  bool operator ==(Object other) =>
      identical(this, other) ||
      other is Todo &&
          runtimeType == other.runtimeType &&
          complete == other.complete &&
          task == other.task &&
          note == other.note &&
          id == other.id;

Final Results

Multi-page status sharing, and corresponding modules are updated according to data changes

fish-redux

Introduction

Produced by Xianyu, it has clear architecture levels and strong code binding, and is suitable for large-scale projects.

Usage

(Only for the global state of the flutter-redux example)

Widget fishReduxApp() {
  final AbstractRoutes routes = PageRoutes(
    pages: <String, Page<Object, dynamic>>{
      "top": FishReduxTestPage(),
      "next": FishReduxNextPage()
    },
    visitor: (String path, Page<Object, dynamic> page) {
      /// 只有特定的范围的 Page 才需要建立和 AppStore 的连接关系
      /// 满足 Page<T> ，T 是 GlobalBaseState 的子类
      if (page.isTypeof<GlobalBaseState>()) {
        /// 建立 AppStore 驱动 PageStore 的单向数据连接
        /// 1. 参数1 AppStore
        /// 2. 参数2 当 AppStore.state 变化时, PageStore.state 该如何变化
        page.connectExtraStore<GlobalCountState>(GlobalStore.store,
                (Object pagestate, GlobalCountState appState) {
              final FishReduxTestState p = pagestate;
              if (p.count != appState.count) {
                if (pagestate is Cloneable) {
                  final Object copy = pagestate.clone();
                  final FishReduxTestState newState = copy;
                  newState.count = appState.count;
                  return newState;
                }
              }
              return pagestate;
            });
      }});

  return MaterialApp(
    title: 'zhile_demo',
    debugShowCheckedModeBanner: false,
    theme: ThemeData(
      primarySwatch: Colors.blue,
    ),
    home: FishReduxTestPage().buildPage(null),
    onGenerateRoute: (RouteSettings settings) {
      return MaterialPageRoute<Object>(builder: (BuildContext context) {
        return routes.buildPage(settings.name, settings.arguments);
      });
    },
  );
}

This code is a global store configuration. The implementation principle of fish-redux for this scenario is that the mainStore is not only a store bound to its own page, but can also be synthesized into a public store. As shown in the code below, this store can be shared by multiple pages. Store shares between pages. Compared with the implementation of flutter-redux, it seems more convoluted.

page.connectExtraStore<GlobalCountState>(GlobalStore.store,
                (Object pagestate, GlobalCountState appState) {
              final FishReduxTestState p = pagestate;
              if (p.count != appState.count) {
                if (pagestate is Cloneable) {
                  final Object copy = pagestate.clone();
                  final FishReduxTestState newState = copy;
                  newState.count = appState.count;
                  return newState;
                }
              }
              return pagestate;
            });
      }});

Compare

flutter-redux advantages

1. Low learning threshold and less intrusive
2. It is simple and convenient to use the same State or the same Reducer on multiple pages

flutter-redux disadvantages

Since there is no definition of Effect, it is not convenient to only modify the logic or other operations that do not require refreshing the page.
After use, the complexity of the code is improved. Compared with fish-redux, the code structure is weaker, resulting in higher code maintenance costs for large projects

other

Determine whether to update

flutter-redux needs to override the == method of viewModel to determine whether the returned data is the same as the current model. If true is returned, it indicates that no update is required, and false is updated. When updating, the view used will be the new viewModel.
The approach of Fish-redux is the same, using !identical(oldState, newState) to determine whether to update, and the state needs to be forced to implement the Cloneable interface and rewrite the clone method to ensure that Update the data when it needs to be updated and ensure that the original object data is correct.

In comparison, each has its own advantages and disadvantages. Flutter-redux has a clear idea. After updating, the data is updated and reacquired. fish-redux is more pure, developers only need to pay attention to individual State.

personal opinion

In terms of implementation, flutter-redux's State is larger and closer to Redux. The State of fish-redux will be very flexible and small, and can be targeted at each module, replacing the viewmodel.

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