MainActivity.java

public class MainActivity extends AppCompatActivity
{
    private static final long MOVE_DEFAULT_TIME = 1000;
    private static final long FADE_DEFAULT_TIME = 300;

    private FragmentManager mFragmentManager;

    @Override
    protected void onCreate(Bundle savedInstanceState)
    {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        ButterKnife.bind(this);
        mFragmentManager = getSupportFragmentManager();

        loadInitialFragment();

        Handler handler = new Handler();
        handler.postDelayed(this::performTransition, 1000);
    }

    private void loadInitialFragment()
    {
        Fragment initialFragment = Fragment1.newInstance();
        FragmentTransaction fragmentTransaction = mFragmentManager.beginTransaction();
        fragmentTransaction.replace(R.id.fragment_container, initialFragment);
        fragmentTransaction.commit();
    }
}