how to persist data across all the activities

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Mobile

Android

i have a login form where after successful login i need to display the name of user in all the screen. i tried it using intents but the name is not consistent across all the activities some screen shows username and others null. is there any other way to achieve this?

this is how i did now. but the result is not consistent

Intent next=new Intent(getApplicationContext(),RoomsConfiguration.class);
                next.putExtra("iUserID",iUserID);
                startActivity(next);

Intent next=getIntent();
        iUserID = next.getStringExtra("id");
        tv.setText(new StringBuilder().append("Logged as ").append(iUserID));