react-native - React Native (Android) - 找不到符号类 ReactInstanceManager

Question

我刚刚升级到 React Native 0.63.3 .....我也将Android studio升级到4.1.1和 gradle 插件到 4.1.0 .
我收到错误 cannot find symbol class ReactInstanceManager当我尝试构建时。错误在文件 MainApplication.java 中.....见下面的代码。
出现错误与行 initializeFlipper(this,getReactNativeHost().getReactInstanceManager()); .
好像是说我提供com.facebook.react.ReactInstanceManager ....但是程序想要的是ReactInstanceManager .它说 Get the current ReactInstanceManager instance, or create one.

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
    initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
  }

  /**
   * Loads Flipper in React Native templates. Call this in the onCreate method with something like
   * initializeFlipper(this, getReactNativeHost().getReactInstanceManager());
   *
   * @param context
   * @param reactInstanceManager
   */
  private static void initializeFlipper(
      Context context, ReactInstanceManager reactInstanceManager) {
    if (BuildConfig.DEBUG) {
      try {
        /*
         * We use reflection here to pick up the class that initializes Flipper, since
         * Flipper library is not available in release mode
         */
        Class<?> aClass = Class.forName("com.xs.ReactNativeFlipper");
        aClass
            .getMethod("initializeFlipper", Context.class, ReactInstanceManager.class)
            .invoke(null, context, reactInstanceManager);
      } catch (ClassNotFoundException e) {

Answer 1

在我将 RN 从 0.61.5 升级到 0.63.3 的过程中，我错过了一行代码。 import com.facebook.react.ReactInstanceManager; MainApplication.java 中缺少