Fragments - Do you have to use an Activity Wrapper around a fragment which comprises the whole Activity?

Question

Consider the sample app from developers.android.com

This describes using Fragments like so:

• On a Phone you can use Fragment 1 on Activity A and fragment 2

Answer 1

More generically you could create a fragment container class:

public class SingleFragmentActivity extends Activity {

    public static final String FRAGMENT_NAME = "fragmentName";
    public static final String FRAGMENT_ARGUMENTS = "fragmentArguments";

    @Override
    protected void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        String fragmentName = getIntent().getStringExtra(FRAGMENT_NAME);
        Fragment fragment = Fragment.instantiate(this, fragmentName);
        Bundle fragmentArguments = getIntent().getBundleExtra(FRAGMENT_ARGUMENTS);
        fragment.setArguments(fragmentArguments);
        getSupportFragmentManager().beginTransaction().replace(android.R.id.content,fragment, "tag").commit();
    }
}

now you use this class to instantiate any fragment as a standalone activity:

public void showFragmentAsActivity() {
    Intent intent = new Intent(this, SingleFragmentActivity.class);
    intent.putExtra(SingleFragmentActivity.FRAGMENT_NAME, MyFragment.class.getName());
    intent.putExtra(SingleFragmentActivity.FRAGMENT_ARGUMENTS,MyFragment.getArgumentsBundle("a string argument"));
    startActivity(intent);
}