看了郭神的源码解析之后，感觉需要为他提供的源码加上一步一步的中文注释，才会更好的理解代码的逻辑，不然我看完给我的感觉是源码依旧博大精深！献上郭神原博客地址：http://blog.csdn.net/guolin_blog/article/details/12921889，方便大家参照着看。
直接show codes了。
//传入3个参数：已解析布局文件的解析者，根布局，是否将布局放到根布局上
public View inflate(XmlPullParser parser, ViewGroup root, boolean attachToRoot) {
synchronized (mConstructorArgs) {
//用来跟踪该inflate方法
Trace.traceBegin(Trace.TRACE_TAG_VIEW, "inflate");
//得到布局文件的所有属性值
final AttributeSet attrs = Xml.asAttributeSet(parser);
Context lastContext = (Context)mConstructorArgs[0];
mConstructorArgs[0] = mContext;
View result = root;
try {
// Look for the root node.寻找根节点
int type;
//当解析事件等于开始标记或者等于文档结束标记时跳出循环
while ((type = parser.next()) != XmlPullParser.START_TAG &&
type != XmlPullParser.END_DOCUMENT) {
// Empty
}
//当解析事件不等于开始标记时抛出填充异常：未找到开始标记
if (type != XmlPullParser.START_TAG) {
throw new InflateException(parser.getPositionDescription()
+ ": No start tag found!");
}
//得到节点名字
final String name = parser.getName();
if (DEBUG) {
System.out.println("**************************");
System.out.println("Creating root view: "
+ name);
System.out.println("**************************");
}
//节点为合并标签
if (TAG_MERGE.equals(name)) {
//如果根布局为空或没有放到根布局上就抛出异常：合并标签只能在一个有效的根布局和放到根布局上时才能使用
if (root == null || !attachToRoot) {
throw new InflateException("<merge /> can be used only with a valid "
+ "ViewGroup root and attachToRoot=true");
}
//循环遍历子view
rInflate(parser, root, attrs, false);
} else {
// Temp is the root view that was found in the xml
//temp是布局文件xml中找到的根布局
View temp;
//？？？？？否则创建temp view的实例
if (TAG_1995.equals(name)) {
temp = new BlinkLayout(mContext, attrs);
} else {
temp = createViewFromTag(root, name, attrs);
}
ViewGroup.LayoutParams params = null;
//根布局不为空时，该布局参数生成由根布局和xml中设置的属性决定。
if (root != null) {
if (DEBUG) {
System.out.println("Creating params from root: " +
root);
}
// Create layout params that match root, if supplied
params = root.generateLayoutParams(attrs);
//如果xml不放到根布局中，则将这个布局参数设置给xml布局
if (!attachToRoot) {
// Set the layout params for temp if we are not
// attaching. (If we are, we use addView, below)
temp.setLayoutParams(params);
}
}
if (DEBUG) {
System.out.println("-----> start inflating children");
}
// Inflate all children under temp
//填充temp布局下的所有子view
rInflate(parser, temp, attrs, true);
if (DEBUG) {
System.out.println("-----> done inflating children");
}
// We are supposed to attach all the views we found (int temp)
// to root. Do that now.
//将所有视图放到根布局中
if (root != null && attachToRoot) {
root.addView(temp, params);
}
// Decide whether to return the root that was passed in or the
// top view found in xml.
//是否将根布局一起返回
if (root == null || !attachToRoot) {
result = temp;
}
}
} catch (XmlPullParserException e) {
InflateException ex = new InflateException(e.getMessage());
ex.initCause(e);
throw ex;
} catch (IOException e) {
InflateException ex = new InflateException(
parser.getPositionDescription()
+ ": " + e.getMessage());
ex.initCause(e);
throw ex;
} finally {
// Don't retain static reference on context.
//不要保留对上下文的静态引用
mConstructorArgs[0] = lastContext;
mConstructorArgs[1] = null;
}
//追踪方法结束
Trace.traceEnd(Trace.TRACE_TAG_VIEW);
return result;
}
}rInflate()方法
/**
* Recursive method used to descend down the xml hierarchy and instantiate
* views, instantiate their children, and then call onFinishInflate().
* 这个递归方法被用来确定xml布局层次并且实例化视图和他们的子视图，然后调用onFinishInflate方法
*/
void rInflate(XmlPullParser parser, View parent, final AttributeSet attrs,
boolean finishInflate) throws XmlPullParserException, IOException {
//得到xml文档层次数
final int depth = parser.getDepth();
int type;
//当解析事件不等于结束标记或者当前解析层次>循环前已解析的层次 且解析事件不等于文档结束
while (((type = parser.next()) != XmlPullParser.END_TAG ||
parser.getDepth() > depth) && type != XmlPullParser.END_DOCUMENT) {
//如果解析事件不等于开始标记，开始新的循环
if (type != XmlPullParser.START_TAG) {
continue;
}
//得到解析器当前指向标签名称
final String name = parser.getName();
//如果该标签为请求焦点，则？？
if (TAG_REQUEST_FOCUS.equals(name)) {
parseRequestFocus(parser, parent);
} else if (TAG_INCLUDE.equals(name)) {//否则如果该标签为include标签
//如果当前解析层次为0层，抛出填充异常:<include />不能作为根元素
if (parser.getDepth() == 0) {
throw new InflateException("<include /> cannot be the root element");
}
//解析include标签的情况
parseInclude(parser, parent, attrs);
} else if (TAG_MERGE.equals(name)) {//否则如果该标签为marge标签,抛出异常：**标签必须作为根元素
throw new InflateException("<merge /> must be the root element");
} else if (TAG_1995.equals(name)) {//否则如果该标签为blink标签
//？？？
final View view = new BlinkLayout(mContext, attrs);
//生成该视图的布局参数，先递归填充该视图中的子视图，最后增加到父布局中
final ViewGroup viewGroup = (ViewGroup) parent;
final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs);
rInflate(parser, view, attrs, true);
viewGroup.addView(view, params);
} else {
//否则直接实例化该视图，生成该视图的布局参数，然后先递归填充该视图中的子视图，最后增加到父布局中
final View view = createViewFromTag(parent, name, attrs);
final ViewGroup viewGroup = (ViewGroup) parent;
final ViewGroup.LayoutParams params = viewGroup.generateLayoutParams(attrs);
rInflate(parser, view, attrs, true);
viewGroup.addView(view, params);
}
}
//如果填充结束，调用父布局的onFinishInflate方法
if (finishInflate) parent.onFinishInflate();
}打？？的地方我还需要去学习才能理解，如有理解的朋友欢迎解答我的疑问，感激不尽！欢迎大家一起学习讨论。先到此，后续会接着写另一个方法…