如何在调用startReactApplication之前在React Native中调用Java方法

package com.yourpackage;

import android.widget.Toast;

import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

public class MyJavaModule extends ReactContextBaseJavaModule {

    public MyJavaModule(ReactApplicationContext reactContext) {
        super(reactContext);
    }

    @Override
    public String getName() {
        return "MyJavaModule";
    }

    @ReactMethod
    public void showToast(String message) {
        Toast.makeText(getReactApplicationContext(), message, Toast.LENGTH_SHORT).show();
    }
}

package com.yourpackage;

import com.facebook.react.ReactPackage;
import com.facebook.react.shell.MainReactPackage;
import com.facebook.soloader.SoLoader;

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

import com.yourpackage.MyJavaModule; // 导入自定义的Java模块

public class MainApplication extends Application implements ReactApplication {

  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 MyJavaModule() // 注册自定义的Java模块
      );
    }

    @Override
    protected String getJSMainModuleName() {
      return "index";
    }
  };

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

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

import { NativeModules } from 'react-native';

const MyJavaModule = NativeModules.MyJavaModule;

MyJavaModule.showToast('Hello from Java');