Android 读写xml文件

Android里面操作xml文件主要有三种方式：

SAX方式，DOM方式，PULL方式。据说因为DOM的方式比较耗内存，而手机最纠结的就是存储空间小的问题，所以在Android里面不提倡使用DOM的方式。而SAX方式和PULL方式的思想比较的相似，原理似乎是同出一则的，实现的思想好像是读取字符串的每一个单词一样，每读取一段就判断读取的是什么内容然后执行相应的方法，直至文件的结尾。

本文的例子主要采用PULL方式读写xml，废话不多说，直接上代码。

xml文件如下

<persons> <person> <name>北京</name> <number>123324324</number> </person> <person> <name>东坡</name> <number>1-591-992-5643</number> </person> <person> <name>俊伟</name> <number>1-379-784-7916</number> </person> </persons>

读xml的代码：

public static boolean readFixedNumbersFromXml() { XmlPullParser xmlParser = Xml.newPullParser(); File file = new File(LISTENED_NUMBERS_FILE); if (!file.exists()) { Log.d(TAG, "file :" + LISTENED_NUMBERS_FILE + " is not exist, create it!"); return false; } int eventType = 0; try { FileInputStream fis = new FileInputStream(file); xmlParser.setInput(fis, "UTF-8"); eventType = xmlParser.getEventType(); ListenInfoManager.ListenedPerson person = null; while (eventType != XmlPullParser.END_DOCUMENT) { Log.d(TAG, "eventType=" + eventType); switch (eventType) { case XmlPullParser.START_DOCUMENT: break; case XmlPullParser.START_TAG: Log.d(TAG, "name=" + xmlParser.getName()); if ("person".equals(xmlParser.getName())) { person = new ListenInfoManager.ListenedPerson(); } if ("name".equals(xmlParser.getName())) { if (person != null) { person.setName(xmlParser.nextText()); } } if ("number".equals(xmlParser.getName())) { if (person != null) { person.setNumber(xmlParser.nextText()); } } break; case XmlPullParser.END_TAG: if ("person".equals(xmlParser.getName())) { Log.d(TAG, "name:" + xmlParser.getName() + ", person=" + person); ListenInfoManager.self().addToCustomNumberList(person); person = null; } break; default: break; } eventType = xmlParser.next(); } } catch (FileNotFoundException e) { Log.d(TAG, "file not found exception!"); e.printStackTrace(); } catch (XmlPullParserException e) { Log.d(TAG, "XmlPullParserException!"); e.printStackTrace(); } catch (IOException e) { Log.d(TAG, "IOException!"); e.printStackTrace(); } return true; }

写xml代码如下：

public static boolean writeFixedNumbersToXmlFile() {        FileOutputStream fos = null;        File file = new File(LISTENED_NUMBERS_FILE_PATH);        if (!file.exists()) {            file.mkdirs();        }        try {            file = new File(LISTENED_NUMBERS_FILE);            if (!file.createNewFile()) {                Log.d(TAG, "file already exist!");                file.delete();                if (!file.createNewFile()) {                    Log.d(TAG, "Create file failed!");                    return false;                }            }        } catch (IOException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            Log.d(TAG, "create xml file failed!");        }        try {            fos = new FileOutputStream(file);        } catch (FileNotFoundException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            return false;        }        XmlSerializer serializer = Xml.newSerializer();        try {            serializer.setOutput(fos, "UTF-8");            //缩进            serializer.setFeature(                    "http://xmlpull.org/v1/doc/features.html#indent-output",                    true);            serializer.startDocument("UTF-8", true);            serializer.startTag(null, "persons");            for (ListenedPerson person : ListenInfoManager.self().getCustomNumberList()) {                serializer.startTag(null, "person");                serializer.startTag(null, "name");                serializer.text(person.getName());                serializer.endTag(null, "name");                serializer.startTag(null, "number");                serializer.text(person.getNumber());                serializer.endTag(null, "number");                serializer.endTag(null, "person");            }            serializer.endTag(null, "persons");            serializer.endDocument();            fos.flush();            fos.close();        } catch (IOException e) {            e.printStackTrace();  //To change body of catch statement use File | Settings | File Templates.            Log.d(TAG, "IOException write xml file failed!");            return false;        } catch (Exception e) {            e.printStackTrace();            Log.d(TAG, "Exception write xml file failed!");            return false;        }        return true;    }

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