使用LayoutInflater.inflate获得布局文件对象，getLayoutParams 返回null

使用View.inflate(LayoutInflater.inflate)获取布局文件对象，页面发现没有填充父窗体，右边有空白。

    private void init() {
        // public static View inflate(Context context, int resource, ViewGroup root) 
        showInMiddle = (LinearLayout) View.inflate(context, R.layout.il_hall,
                null);
        // root 不为null， View.inflate返回root
        // root 为null,不会setLayoutParams，导致 showInMiddle.getLayoutParams() 返回 null, 
        //解决办法是手动设置一下，（但ListView比较特殊，它自己设置好了）
        if (showInMiddle.getLayoutParams() == null) {
            showInMiddle.setLayoutParams(new LinearLayout.LayoutParams(
                    LayoutParams.MATCH_PARENT, LayoutParams.MATCH_PARENT));
        }
    }

ListView中的源码：

   private void measureScrapChild(View child, int position, int widthMeasureSpec) {
        LayoutParams p = (LayoutParams) child.getLayoutParams();
        **if (p == null) {
            p = (AbsListView.LayoutParams) generateDefaultLayoutParams();
            child.setLayoutParams(p);
        }**
        ..............
    }    
   /** * Measure a particular list child. * TODO: unify with setUpChild. * @param child The child. */
    private void measureItem(View child) {
        ViewGroup.LayoutParams p = child.getLayoutParams();
        **if (p == null) {
            p = new ViewGroup.LayoutParams(
                    ViewGroup.LayoutParams.MATCH_PARENT,
                    ViewGroup.LayoutParams.WRAP_CONTENT);
        }**
        ..............
      }