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);
    }