public void greyView(View v){
    grey = (Button) findViewById(R.id.greyButton);
    relativeLayout = (RelativeLayout) findViewById(R.id.contentmainactivity2);
    relativeLayout.setBackgroundColor(Color.parseColor("#383838"));
}

RelativeLayout popupwindow = (RelativeLayout) findViewById(R.id.popupwindow);
        relativeLayout = (RelativeLayout) findViewById(R.id.contentmainactivity2);
            settings = (Button) findViewById(R.id.settingsbutton);
            settings.setOnClickListener(new View.OnClickListener() {
        @Override
            public void onClick(View view) {

            layoutInflater = (LayoutInflater) getApplicationContext().getSystemService(LAYOUT_INFLATER_SERVICE);
            ViewGroup container = (ViewGroup) layoutInflater.inflate(R.layout.popupwindow, null);

            popupWindow = new PopupWindow(container, 600, 100, true);
            popupWindow.showAtLocation(relativeLayout, Gravity.NO_GRAVITY, 10, 975);

            container.setOnTouchListener(new View.OnTouchListener(){
                @Override
                public boolean onTouch(View view, MotionEvent motionEvent){
                    popupWindow.dismiss();
                    return true;
                }
            });
        }
    });