Asynchronous Fragments - https://patrickmclaren.com/asynchronously-managing-fragments/

FragmentActivity.java

package com.patrickmclaren.examples.asyncfragments;

import android.app.Activity;
import android.app.FragmentManager;
import android.app.FragmentTransaction;

import android.content.res.Configuration;
import android.os.Bundle;

public class FragmentActivity extends Activity {
  private ExampleFragment mFragment;
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
    super(savedInstanceState)
  }
  
  public void addFragment() {
    FragmentManager fm = getSupportFragmentManager();
    
    mFragment = (ExampleFragment) fm.findFragmentByTag(ExampleFragment.TAG);
    if (mFragment == null) {
      FragmentTransaction ft = fm.beginTransaction();
      mFragment = new ExampleFragment();

      ft.add(R.id.container, mFragment, ExampleFragment.TAG);

      try {
        ft.commit();
      } catch(IllegalStateException e) {
        // Activity may be destroyed, you can't complete this transaction
        mFragment = null;
      }
    } else {
      // Fragment already added
      if (mFragment.isInLayout()) {
        // Fragment in View hierarchy
      }
    }
  }
}