How can I make the transition from activation to fragment

This is how activities are triggered. Work with fragments is different. You can add <fragment> to the view file or work with fragments through the fragment manager. For example:

 FragmentTransaction fTrans = getFragmentManager().beginTransaction(); fTrans.add(R.id.frgmCont, frag1); 

In general, for a better understanding, read this lesson and further on this site.

It is impossible to open a fragment through Intent .

In addition, it is impossible to make a "transition from activation to fragment" . A fragment is always associated with activity, it cannot exist separately from activity. So you can open fragments, replace fragments, but all this will go through the activity that "is the parent" of the fragment / fragments.

You can add a snippet to an activity using a transaction:

  FragmentTransaction ft = getFragmentManager().beginTransaction(); MyFragment fragment = new MyFragment(); ft.add(R.id.container, fragment); ft.commit(); 

The first argument passed to the add() method is the ViewGroup container object for the fragment ( LinearLayout , for example), specified using the resource identifier. The second parameter is the fragment to add.
The commit() method is called for the changes to take effect.