创建xml文件并将其保存在内部存储Android中 [英] Create xml file and save it in internal storage android
问题描述
我想在android内部存储中检查new.xml
是否存在(它将由我创建),那么它应该为我返回一个句柄,并且我很容易能够向其添加新数据.不存在,请创建一个新文件并向其中添加数据.
I want to check in the android internal storage if new.xml
exists(which will be created by me) then it should return me a handle for it and i may be easily able to append new data to it.If it doesn't exists create a new one and add data to it.
我的xml文件结构将很简单.
My xml file structure will be simple like this.
<root>
<record>a</record>
<record>b</record>
<record>c</record>
</root>
如果文件存在,我只会向其中添加一条新记录.但是如果没有,我将创建一个新文件并向其中添加第一条记录.
If the file is there I will only add a new record to it.But if doesn't than I will create a new file and add the first record to it.
以及如何在arraylist
中读取此数据.预先提供示例代码非常感谢.
And How I will be able to read this data in an arraylist
. An example with code would be great thanks in advance.
推荐答案
这很简单.这将为您提供帮助:
It's rather simple. This will help you:
String filename = "file.txt";
FileOutputStream fos;
fos = openFileOutput(filename,Context.MODE_APPEND);
XmlSerializer serializer = Xml.newSerializer();
serializer.setOutput(fos, "UTF-8");
serializer.startDocument(null, Boolean.valueOf(true));
serializer.setFeature("http://xmlpull.org/v1/doc/features.html#indent-output", true);
serializer.startTag(null, "root");
for(int j = 0; j < 3; j++)
{
serializer.startTag(null, "record");
serializer.text(data);
serializer.endTag(null, "record");
}
serializer.endDocument();
serializer.flush();
fos.close();
要使用DOM解析器读回数据,请执行以下操作:
To read back data using DOM parser:
FileInputStream fis = null;
InputStreamReader isr = null;
fis = context.openFileInput(filename);
isr = new InputStreamReader(fis);
char[] inputBuffer = new char[fis.available()];
isr.read(inputBuffer);
data = new String(inputBuffer);
isr.close();
fis.close();
/*
* Converting the String data to XML format so
* that the DOM parser understands it as an XML input.
*/
InputStream is = new ByteArrayInputStream(data.getBytes("UTF-8"));
ArrayList<XmlData> xmlDataList = new ArrayList<XmlData>();
XmlData xmlDataObj;
DocumentBuilderFactory dbf;
DocumentBuilder db;
NodeList items = null;
Document dom;
dbf = DocumentBuilderFactory.newInstance();
db = dbf.newDocumentBuilder();
dom = db.parse(is);
// Normalize the document
dom.getDocumentElement().normalize();
items = dom.getElementsByTagName("record");
ArrayList<String> arr = new ArrayList<String>();
for (int i = 0; i < items.getLength(); i++)
{
Node item = items.item(i);
arr.add(item.getNodeValue());
}
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