kangaroo/android/app/src/main/java/com/kangaroo/MainActivity.java

package com.kangaroo;

import com.facebook.react.ReactActivity;
import com.facebook.react.ReactActivityDelegate;
import com.facebook.react.ReactRootView;
import com.swmansion.gesturehandler.react.RNGestureHandlerEnabledRootView;

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
  protected String getMainComponentName() {
    return "kangaroo";
  }
  @Override
  protected ReactActivityDelegate createReactActivityDelegate() {
    return new ReactActivityDelegate(this, getMainComponentName()){
      @Override
      protected ReactRootView createRootView() {
        return new RNGestureHandlerEnabledRootView(MainActivity.this)
      }
    };
  }
}