新增缺少的getExclusiveAppComponent()函数 · Pull Request !96 · OpenHarmony-SIG/flutter_engine

**【任务描述】**

和Android实现类似
[FlutterActivityAndFragmentDelegate. Host的ExclusiveAppComponent](https://gitee.com/openharmony-sig/flutter_engine/blob/master/shell/platform/android/io/flutter/embedding/android/FlutterActivityAndFragmentDelegate.java#L990)

```

/**
     * Returns the {@link ExclusiveAppComponent<Activity>} that is associated with {@link
     * io.flutter.embedding.engine.FlutterEngine}.
     *
     * <p>In the scenario where multiple {@link FlutterActivity} or {@link FlutterFragment} share
     * the same {@link FlutterEngine}, to attach/re-attache a {@link FlutterActivity} or {@link
     * FlutterFragment} to the shared {@link FlutterEngine}, we MUST manually invoke {@link
     * ActivityControlSurface#attachToActivity(ExclusiveAppComponent, Lifecycle)}.
     *
     * <p>The {@link ExclusiveAppComponent} is exposed here so that subclasses of {@link
     * FlutterActivity} or {@link FlutterFragment} can access it.
     */
    ExclusiveAppComponent<Activity> getExclusiveAppComponent();
```

FlutterAbilityDelegate.ets中的interface Host缺少类似的函数

**【解决方案】**

添加getExclusiveAppComponent

**【任务来源】**

类型	指派人员	状态
审查	zjzhu 已审查通过 aibin 已审查通过 lihui 已审查通过	已完成 (3/1人)
测试	lihui openharmony_ci 已测试通过	已完成 (1/1人)

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