How to add a fragment to an Activity without a container

Question

Is that possible I can add a fragment view on the activity view without specifying "fragment" view component in activity's layout xml file? Which function should I look for?

Answer 1

Well, the UI of the fragment has to go somewhere. If you want the entire "content view" to be the fragment, add the fragment to android.R.id.content:

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    if (getSupportFragmentManager().findFragmentById(android.R.id.content)==null) {
      getSupportFragmentManager().beginTransaction()
        .add(android.R.id.content, new ToDoRosterListFragment())
        .commit();
    }
  }

Otherwise, somewhere in the activity's view hierarchy, you need a container (usually a FrameLayout) in which to place the fragment's UI. Typically, we do that by putting the container in the layout resource.

Answer 2

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

        getSupportFragmentManager().beginTransaction()
            .add(android.R.id.content, MyFragment.newInstance())
            .commit();

   //Some of your code here
}

android.R.id.content is the container of entire app screen. It can be used with Fragment:

The android.R.id.content ID value indicates the ViewGroup of the entire content area of an Activity.

The code above will insert the View created by Fragment into the ViewGroup identified by android.R.id.content.