Android Example: FragmentManager (via http://goo.gl/79cFmz)

public void show() {
    FragmentManager fragmentManager = mActivity.getSupportFragmentManager();
    FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();

    Fragment prev = fragmentManager.findFragmentByTag(FRAGMENT_TAG);
    if (prev != null) {
        fragmentTransaction.remove(prev);
    }
    fragmentTransaction.addToBackStack(null);

    ErrorDialogFragment.newInstance(mTitle, mMessage, mOnClickListener, mOnCancelListener)
            .show(fragmentManager, FRAGMENT_TAG);
}