Snippet of a BaseActivity class extended by child Activities. Makes it simpler to switch fragments in the same Activity if the setup is always the same. Removes repetition.

BaseActvity.java

protected void switchToFragment(Fragment fragment) {
        switchToFragment(fragment, false, null);
    }

  protected void switchToFragment(Fragment fragment, boolean addToBackStack, String tag) {
      if (fragment != null) {
          FragmentTransaction transaction = getFragmentManager().beginTransaction().replace(R.id.container, fragment);

          if (addToBackStack) { transaction.addToBackStack(tag); }

          transaction.commit();
      }
  }