Answers for "pass data from activity to activity"

send variable intent

String sessionId = getIntent().getStringExtra("EXTRA_SESSION_ID");

send variable intent

Intent intent = new Intent(getBaseContext(), SignoutActivity.class);
intent.putExtra("EXTRA_SESSION_ID", sessionId);
startActivity(intent);

Passing data from an activity to a fragment

Bundle bundle = new Bundle();
 String myMessage = "Stack Overflow is cool!";
 bundle.putString("message", myMessage );
 FragmentClass fragInfo = new FragmentClass();
 fragInfo.setArguments(bundle);
 transaction.replace(R.id.fragment_single, fragInfo);
 transaction.commit();

Passing data from an activity to a fragment

@Override
 public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    String myValue = this.getArguments().getString("message");
    ...
 }