DialogFragment自定义dialog的位置和大小

@Override    public void onResume() {        super.onResume();        Window dialogWindow = getDialog().getWindow();        WindowManager.LayoutParams lp = dialogWindow.getAttributes();        dialogWindow.setGravity(Gravity.LEFT | Gravity.TOP);        lp.x = 0;        lp.y = 0;        lp.width = lp.MATCH_PARENT;        lp.height = 600;        lp.alpha = 0.7f;        dialogWindow.setAttributes(lp);    }