今天又重新温习一下xml的三种解析，参考网址Android中解析XML，写得确实很好，写了三个例子，自己敲了一遍，很快就理解差不多了，但是看了一遍以后，想看深入一些，看看他的流程是什么，于是就在code中添加的打印堆栈的log，可以参考Android打印代码调用栈，以后遇到问题，可以添加这些log就能解决很多的事情了。看了一下，log信息如下：
D/congcl ( 5074): startDocument trace: dalvik.system.VMStack.getThreadStackTrace(Native Method) D/congcl ( 5074): startDocument trace: java.lang.Thread.getStackTrace(Thread.java:591) D/congcl ( 5074): startDocument trace: com.project.xmlparse.model.parser.SaxBookParser$MyHandler.startDocument(SaxBookParser.java:110) D/congcl ( 5074): startDocument trace: org.apache.harmony.xml.ExpatParser.startDocument(ExpatParser.java:524) D/congcl ( 5074): startDocument trace: org.apache.harmony.xml.ExpatParser.parseDocument(ExpatParser.java:473) D/congcl ( 5074): startDocument trace: org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:321) D/congcl ( 5074): startDocument trace: org.apache.harmony.xml.ExpatReader.parse(ExpatReader.java:279) D/congcl ( 5074): startDocument trace: javax.xml.parsers.SAXParser.parse(SAXParser.java:390) D/congcl ( 5074): startDocument trace: javax.xml.parsers.SAXParser.parse(SAXParser.java:187) D/congcl ( 5074): startDocument trace: com.project.xmlparse.model.parser.SaxBookParser.parse(SaxBookParser.java:38) D/congcl ( 5074): startDocument trace: com.project.xmlparse.MainActivity$1.onClick(MainActivity.java:39) D/congcl ( 5074): startDocument trace: android.view.View.performClick(View.java:4202) D/congcl ( 5074): startDocument trace: android.view.View$PerformClick.run(View.java:17340) D/congcl ( 5074): startDocument trace: android.os.Handler.handleCallback(Handler.java:725) D/congcl ( 5074): startDocument trace: android.os.Handler.dispatchMessage(Handler.java:92) D/congcl ( 5074): startDocument trace: android.os.Looper.loop(Looper.java:137) D/congcl ( 5074): startDocument trace: android.app.ActivityThread.main(ActivityThread.java:5039) D/congcl ( 5074): startDocument trace: java.lang.reflect.Method.invokeNative(Native Method) D/congcl ( 5074): startDocument trace: java.lang.reflect.Method.invoke(Method.java:511) D/congcl ( 5074): startDocument trace: com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) D/congcl ( 5074): startDocument trace: com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) D/congcl ( 5074): startDocument trace: dalvik.system.NativeStart.main(Native Method)
通过log信息很快就能定位它的执行流成了，主要的文件有SAXParser，ExpatParse，最后就已字节流的形式下发到底层，defaulthandler中的一些方法也都是在底层中上报调用的，代码点击下载