无法解析符号ReactApplication/ReactNativeHost

Question

我有一个react原生运行在iOS上完美，但不能在Android studio中编译，因为MainApplication和MainActivity中的导入问题。我遵循React本地FBSDK指南。

package com.ExampleApp;

import android.app.Application;

import com.facebook.react.ReactApplication;
import com.tradle.react.UdpSocketsModule;
import com.peel.react.TcpSocketsModule;
import com.peel.react.rnos.RNOSModule;
import com.masteratul.exceptionhandler.ReactNativeExceptionHandlerPackage;
import com.oblador.vectoricons.VectorIconsPackage;
import com.facebook.react.ReactNativeHost;
import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;
import com.facebook.CallbackManager;
import com.facebook.FacebookSdk;
import com.facebook.reactnative.androidsdk.FBSDKPackage;
import com.facebook.appevents.AppEventsLogger;

import java.util.Arrays;
import java.util.List;

public class MainApplication extends Application implements ReactApplication {

  private static CallbackManager mCallbackManager = CallbackManager.Factory.create();

  protected static CallbackManager getCallbackManager() {
    return mCallbackManager;
  }

  @Override
  public void onCreate() {
    super.onCreate();
    // Use AppEventsLogger to log custom events.
    AppEventsLogger.activateApp(this);
  }

  private final ReactNativeHost mReactNativeHost = new ReactNativeHost(this) {

    @Override
    public boolean getUseDeveloperSupport() {
        return BuildConfig.DEBUG;
    }

    @Override
    protected List<ReactPackage> getPackages() {
      return Arrays.<ReactPackage>asList(
          new MainReactPackage(),
            new UdpSocketsModule(),
            new TcpSocketsModule(),
            new RNOSModule(),
            new ReactNativeExceptionHandlerPackage(),
            new VectorIconsPackage(),
            new FBSDKPackage(mCallbackManager)

      );
    }
  };

  @Override
  public ReactNativeHost getReactNativeHost() {
    return mReactNativeHost;
  }

}

我的主要活动：

import android.content.Intent;
import com.facebook.react.ReactActivity;


public class MainActivity extends ReactActivity {

    /**
     * Returns the name of the main component registered from JavaScript.
     * This is used to schedule rendering of the component.
     */

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        MainApplication.getCallbackManager().onActivityResult(requestCode, resultCode, data);
    }

    @Override
    protected String getMainComponentName() {
        return "ExampleApp";
    }
}

Answer 1

从世博会中分离出我的react-native项目后，我也遇到了这种情况。

在MainApplication中，对于这些导入，我有“错误不能解析符号”：

import com.facebook.react.ReactApplication;
import com.facebook.react.ReactNativeHost;

在我的package.json文件中，我使用了：

"react-native": "https://github.com/expo/react-native/archive/sdk-29.0.0.tar.gz",

删除node_modules文件

这就为我解决了问题。希望我能帮上忙。