大牛帮忙分析github slidingmenu源码?报错

/**
* Attaches the SlidingMenu to an entire Activity
*
* @param activity the Activity
* @param slideStyle either SLIDING_CONTENT or SLIDING_WINDOW
* @param actionbarOverlay whether or not the ActionBar is overlaid
*/
public void attachToActivity(Activity activity, int slideStyle, boolean actionbarOverlay) {
if (slideStyle != SLIDING_WINDOW && slideStyle != SLIDING_CONTENT)
throw new IllegalArgumentException("slideStyle must be either SLIDING_WINDOW or SLIDING_CONTENT");
if (getParent() != null)
throw new IllegalStateException("This SlidingMenu appears to already be attached");
// get the window background
TypedArray a = activity.getTheme().obtainStyledAttributes(new int[] {android.R.attr.windowBackground});
int background = a.getResourceId(0, 0);
a.recycle();
switch (slideStyle) {
case SLIDING_WINDOW:
mActionbarOverlay = false;
ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);
// save ActionBar themes that have transparent assets
decorChild.setBackgroundResource(background);
decor.removeView(decorChild);
decor.addView(this);
setContent(decorChild);
break;
case SLIDING_CONTENT:
mActionbarOverlay = actionbarOverlay;
// take the above view out of
ViewGroup contentParent = (ViewGroup)activity.findViewById(android.R.id.content);
View content = contentParent.getChildAt(0);
contentParent.removeView(content);
contentParent.addView(this);
setContent(content);
// save people from having transparent backgrounds
if (content.getBackground() == null)
content.setBackgroundResource(background);
break;
}
}

复制代码

上面代码来自github 上的slidingmenu, 地址:https://github.com/jfeinstein10/SlidingMenu
上面方法中的两个case: 如果执行第一个case, 那么滑动actionBar, 滑动菜单会被滑动. 如果执行第二个case, 滑动actionBar, 滑动菜单没有反应.. 求分析????

问题一:      TypedArray a = activity.getTheme().obtainStyledAttributes(new int[] {android.R.attr.windowBackground});
               int background = a.getResourceId(0, 0);  // 两个0 分别表示什么???
               a.recycle(); // 为什么要调用recycle方法???

问题二: ViewGroup decor = (ViewGroup) activity.getWindow().getDecorView();
                              ViewGroup decorChild = (ViewGroup) decor.getChildAt(0);                               与                               ViewGroup contentParent = (ViewGroup)activity.findViewById(android.R.id.content);
                              View content = contentParent.getChildAt(0); 两者有什么区别???    getChildAt(0) 是滑动菜单? 还是菜单?

            问题三: decor.removeView(decorChild);                                                          decor.addView(this);
                           setContent(decorChild);

                           contentParent.removeView(content);
                           contentParent.addView(this);
                           setContent(content);
                        为什么两个case里面都是先移除子布局?  然后添加this布局??  其中this布局代表的是哪个布局???  我试过,如果注释removeView                            方法, 程序会报错... 同时主调removeView方法和addView方法程序也会报错... 如果仅仅只是主调addView方法, 那么程序跑起来就是一片空白....

大牛帮忙分析github slidingmenu源码?报错

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