mainApplication.java

package com.mirl;

import android.app.Application;

import com.facebook.react.ReactApplication;
import com.facebook.reactnative.androidsdk.FBSDKPackage;
import com.facebook.reactnative.androidsdk.FBSDKPackage;
import io.realm.react.RealmReactPackage;
import com.burnweb.rnsimplealertdialog.RNSimpleAlertDialogPackage;
import com.i18n.reactnativei18n.ReactNativeI18n;
import com.facebook.reactnative.androidsdk.FBSDKPackage;
import com.reactnative.ivpusic.imagepicker.PickerPackage;
import com.imagepicker.ImagePickerPackage;
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 rnxmpp.RNXMPPPackage;

import java.util.Arrays;
import java.util.List;
import com.facebook.FacebookSdk;
import com.facebook.CallbackManager;
import com.facebook.appevents.AppEventsLogger;

public class MainApplication extends Application implements ReactApplication {
  private static CallbackManager mCallbackManager = CallbackManager.Factory.create();

    protected static CallbackManager getCallbackManager() {
          return mCallbackManager;
    }
  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 FBSDKPackage(mCallbackManager),
            new RealmReactPackage(),
            new RNSimpleAlertDialogPackage(),
            new ReactNativeI18n(),
            new VectorIconsPackage(),
            new RNXMPPPackage(),
            new ImagePickerPackage()
      );
    }
  };

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

  @Override
  public void onCreate() {
    super.onCreate();
    SoLoader.init(this, /* native exopackage */ false);
    FacebookSdk.sdkInitialize(getApplicationContext());
    AppEventsLogger.activateApp(this);

  }
}