essertionError:此根视图已经连接到Catalyst实例管理器上

Question

我有一个本机android应用，其中一些碎片充满了反应本机视图。

当将一个反应本机片段添加到背面，然后背面弹出回复本机片段时，我会收到以下错误：

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)

有人知道为什么我会遇到这个root视图的错误，或者我如何重复使用相同的根视图？

我的反应片段看起来像这样：

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

可能您在视图中使用了片段。

在Oncreateview中移动视图的定义

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

并记住通过添加

之类的反应来卸载其他实例

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