android - 断言错误 : This root view has already been attached to a catalyst instance manager

Question

我有一个原生 Android 应用程序，其中有一些 fragment 被 React Native View 膨胀。

当将其中一个 React Native fragment 添加到后台堆栈，然后后台弹出回到 React Native fragment 时，我收到以下错误:

E/AndroidRuntime: FATAL EXCEPTION: main
java.lang.AssertionError: This root view has already been attached to a catalyst instance manager
    at com.facebook.infer.annotation.Assertions.assertCondition(Assertions.java:65)
    at com.facebook.react.ReactRootView.startReactApplication(ReactRootView.java:207)
    at com.vb.easternunion.fragments.ReactFragment.onActivityCreated(ReactFragment.java:52)
    at android.support.v4.app.Fragment.performActivityCreated(Fragment.java:2096)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1138)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1295)
    at android.support.v4.app.BackStackRecord.popFromBackStack(BackStackRecord.java:1038)
    at android.support.v4.app.FragmentManagerImpl.popBackStackState(FragmentManager.java:1742)
    at android.support.v4.app.FragmentManagerImpl$2.run(FragmentManager.java:601)
    at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1682)
    at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:541)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:148)
    at android.app.ActivityThread.main(ActivityThread.java:5417)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

任何人都知道为什么我会收到已附加 Root View 的错误或者我如何重用相同的 Root View ？

我的 React fragment 看起来像这样:

public class ReactFragment extends Fragment {
    private ReactRootView mReactRootView;
    private ReactInstanceManager mReactInstanceManager;
    private MainActivity main;

    @Override
    public void onAttach(Context context) {
        super.onAttach(context);

        main = (MainActivity) getActivity();

        mReactRootView = new ReactRootView(context);
        mReactInstanceManager =
                ((AppManager) getActivity().getApplication())
                        .getReactNativeHost()
                        .getReactInstanceManager();

    }

    @Override
    public ReactRootView onCreateView(LayoutInflater inflater, ViewGroup group, Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        return mReactRootView;
    }


    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        mReactRootView.startReactApplication(
                mReactInstanceManager,
                "AndroidApp",
                getLaunchOptions()
        );

    }

    protected
    @Nullable
    Bundle getLaunchOptions() {
        return AppManager.getReactBundle();
    }



    @Override
    public void onDestroyView() {
        super.onDestroyView();
        mReactRootView.unmountReactApplication();
    }

}

Answer 1

可能您正在 View 寻呼机中使用您的 fragment 。

在 onCreateView 中移动 View 的定义

@Override
public ReactRootView onCreateView(LayoutInflater inflater, ViewGroup group, Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    mReactRootView = new ReactRootView(getActivity());
    return mReactRootView;
}

并记住通过在 ReactFragment 中添加类似

的内容来卸载其他实例

@Override
public void onDetach() {
    super.onDetach();
    mReactRootView.unmountReactApplication();
}