Use of Classname.this and this in java/android

If you use this in an inner class to refer to an instance of the inner class, and if Outerclassname.this is the instance of the class outside it

Classname.this This usage is used in nested class (inner class), when inner class (inner class) must be used to outer class (external Class) of this instance (instance), Just use Outerclassname.this.

Places that are commonly used in Android such as:

Button button = (button) Findviewbyid (r.id.ticket_details_sell_ticket); Button.setonclicklistener (new  Onclicklistener () {    @Override public    void OnClick (View v) {        //It is wrong to use only ' this ', because it would        //reference the just created Onclicklistener object        Intent login = new Intent (Classname.this, Login.class) ;        Startactivityforresult (login, login_request);    });