Don't create new fragments when rotate android screen

Question

In my MainActivity, I have 4 fragments. When I rotated the screen, new Fragment objects will be recreated, that makes my app very slow, sometimes it generated Android not responding. Could you tell me a way to fix it?

In MainActivity.java:

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (homeFragment == null) {
            homeFragment = new HomeFragment(this);
        }
        
        if (photoFragment == null) {
            photoFragment = new PhotoFragment(this);
        }
        
        if (videoFragment == null) {
            videoFragment = new VideoFragment(this);
        }  
        
        if (settingFragment == null) {
            settingFragment = new SettingFragment(this);
        }
        ....
     }