/*
*添加权限<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/> * <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>*/ //正文 /** * 写xml文件到本地 * 实体person类 (id name age) */ private void writeXmlToLocal() { List<Person> personList = getPersonList(); // 获得序列化对象 XmlSerializer serializer = Xml.newSerializer(); try { File path = new File(Environment.getExternalStorageDirectory(), "persons.xml"); FileOutputStream fos = new FileOutputStream(path); // 指定序列化对象输出的位置和编码 serializer.setOutput(fos, "utf-8"); serializer.startDocument("utf-8", true); // 写开始 <?xml version='1.0' encoding='utf-8' standalone='yes' ?> //null 命名空间 serializer.startTag(null, "persons"); // <persons> for (Person person : personList) { // 开始写人serializer.startTag(null, "person"); // <person>
serializer.attribute(null, "id", String.valueOf(person.getId())); // 写名字 serializer.startTag(null, "name"); // <name> serializer.text(person.getName()); serializer.endTag(null, "name"); // </name> // 写年龄 serializer.startTag(null, "age"); // <age> serializer.text(String.valueOf(person.getAge())); serializer.endTag(null, "age"); // </age> serializer.endTag(null, "person"); // </person> } serializer.endTag(null, "persons"); // </persons> serializer.endDocument(); // 结束 } catch (Exception e) { e.printStackTrace(); } } //解析xml文件 private List<Person> parserXmlFromLocal() { try { File path = new File(Environment.getExternalStorageDirectory(), "persons.xml"); FileInputStream fis = new FileInputStream(path); // 获得pull解析器对象 XmlPullParser parser = Xml.newPullParser(); // 指定解析的文件和编码格式 parser.setInput(fis, "utf-8"); int eventType = parser.getEventType(); // 获得事件类型 List<Person> personList = null; Person person = null; String id; while(eventType != XmlPullParser.END_DOCUMENT) { String tagName = parser.getName(); // 获得当前节点的名称 switch (eventType) { case XmlPullParser.START_TAG: // 当前等于开始节点 <person> if("persons".equals(tagName)) { // <persons> personList = new ArrayList<Person>(); } else if("person".equals(tagName)) { // <person id="1"> person = new Person(); id = parser.getAttributeValue(null, "id"); person.setId(Integer.valueOf(id)); } else if("name".equals(tagName)) { // <name> person.setName(parser.nextText()); } else if("age".equals(tagName)) { // <age> person.setAge(Integer.parseInt(parser.nextText())); } break; case XmlPullParser.END_TAG: // </persons> if("person".equals(tagName)) { // 需要把上面设置好值的person对象添加到集合中 personList.add(person); } break; default: break; } eventType = parser.next(); // 获得下一个事件类型 } return personList; } catch (Exception e) { e.printStackTrace(); } return null; }