How to handle back button press in Custom View in android?

 relativeLayout.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View v, int keyCode, KeyEvent event) {                
                if( keyCode == KeyEvent.KEYCODE_BACK) {               
                       do....something                   
                }
                return false;
            }

}

This code is not working. When I press on backbutton, It doesn't shows any response. Please anyone help me. Thanks in advance ......

You are almost there, but this is exaclty what you need to do.

relativeLayout.setFocusableInTouchMode(true);
relativeLayout.requestFocus();
relativeLayout.setOnKeyListener(new View.OnKeyListener() {
    @Override
    public boolean onKey(View v, int keyCode, KeyEvent event) {

         if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK) {
                if(You have handled the back press in your View){ return true; }
                return false;
        }
    });