FragmentUtils.java

public class FragmentUtils {

    public static FragmentTransaction ensureTransaction(final FragmentManager fragmentManager) {
        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
        fragmentTransaction.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left, R.anim.slide_in_right, R.anim.slide_out_left);
        return fragmentTransaction;
    }

    public static Fragment getFragment(final FragmentManager fragmentManager, final String tag) {
        return fragmentManager.findFragmentByTag(tag);
    }

    public static Fragment getFragment(final FragmentManager fragmentManager, final int id) {
        return fragmentManager.findFragmentById(id);
    }

    public static void attachFragment(final FragmentTransaction fragmentTransaction, final int content, final Fragment fragment, final String tag) {
        if (fragment != null) {
//            fragmentTransaction.setCustomAnimations(R.anim.slide_in_right, R.anim.slide_out_left);
            if (fragment.isDetached()) {
                fragmentTransaction.attach(fragment);
            } else if (!fragment.isAdded()) {
                fragmentTransaction.add(content, fragment, tag);
            }
        }
    }

    public static void reAttachFragment(final FragmentTransaction fragmentTransaction, final Fragment fragment) {
        fragmentTransaction.attach(fragment);
    }

    public static void detachFragment(final FragmentTransaction fragmentTransaction, final Fragment fragment) {
        if (fragment != null && !fragment.isDetached()) {
            fragmentTransaction.detach(fragment);
        }
    }

    public static void commitTransactions(final FragmentTransaction fragmentTransaction) {
        if (fragmentTransaction != null && !fragmentTransaction.isEmpty()) {
            fragmentTransaction.commit();
        }
    }

    @SuppressWarnings("unchecked")
    public static <T extends Fragment> T findFragment(final FragmentManager fragmentManager, final String tag) {
        return (T) fragmentManager.findFragmentByTag(tag);
    }

    @SuppressWarnings("unchecked")
    public static <T extends Fragment> T findFragment(final FragmentManager fragmentManager, final int id) {
        return (T) fragmentManager.findFragmentById(id);
    }
    
}