小编典典

最初， 您必须建立一个http连接，以便可以从api获得响应，无论是xml响应还是json响应。您可以使用以下代码。

使班级与活动分开。：-

public class Response {

String get_url, response;

Activity activity;

public Response(String url){

this.get_url = url;

}

public String getResponse(){

InputStream in = null;

byte[] data = new byte[1000];

try {

URL url = new URL(get_url);

URLConnection conn = url.openConnection();

conn.connect();

/* conn.*/

in = conn.getInputStream();

Log.d("Buffer Size +++++++++++++", ""+in.toString().length());

BufferedReader rd = new BufferedReader(new InputStreamReader(in),in.toString().length());

String line;

StringBuilder sb = new StringBuilder();

while ((line = rd.readLine()) != null) {

sb.append(line);

}

rd.close();

response = sb.toString();

in.read(data);

Log.d("INPUT STREAM PROFILE RESPONSE",response);

in.close();

} catch (IOException e1) {

Log.d("CONNECTION ERROR", "+++++++++++++++++++++++++++");

// TODO Auto-generated catch block

e1.printStackTrace();

}

return response;

}

}

您可以像这样在活动中上课：-

Response res = new Response("your_url");

String getResponse = res.getResponse();

因此，您可以从api获得响应。

现在，让解析器

//Extend the class with Default Handler

public class XMLParser extends DefaultHandler {

//You must have basic knowledge about Array List and setter/getter methods

// This is where the data will be stored

ArrayList itemsList;

Item item;

String data;

String type;

private String tempVal;

//Create the Constructor

public XMLParser(String data){

itemsList = new ArrayList();

this.data = data;

}

public byte parse(){

SAXParserFactory spf = null;

SAXParser sp = null;

InputStream inputStream = null;

try {

inputStream = new ByteArrayInputStream(data.getBytes());

spf = SAXParserFactory.newInstance();

if (spf != null) {

sp = spf.newSAXParser();

sp.parse(inputStream, this);

}

}

/*

* Exceptions need to be handled MalformedURLException

* ParserConfigurationException IOException SAXException

*/

catch (Exception e) {

System.out.println("Exception: " + e);

e.printStackTrace();

} finally {

try {

if (inputStream != null)

inputStream.close();

} catch (Exception e) {

}

}

if (itemsList != null && itemsList.size() > 0) {

// //Log.d("Array List Size",""+tipsList.get(4).getTitle());

return 1;

} else {

return 0;

}

}

public ArrayList getItemList(){

return itemsList;

}

// Here you can check for the xml Tags

@Override

public void startElement(String uri, String localName, String qName,

Attributes attributes) throws SAXException {

if(localName.equalsIgnoreCase("item")){

item = new Item();

Log.d("Working", "+++++++++++++++++++++++");

}

}

//tempVal is the variable which stores text temporarily and you

// may save the data in arraylists

public void characters(char[] ch, int start, int length)

throws SAXException {

tempVal = new String(ch, start, length);

}

@Override

public void endElement(String uri, String localName, String qName)

throws SAXException {

if(localName.equalsIgnoreCase("item")){

itemsList.add(item);

Log.d("Working in endelement", "+++++++++++++++++++++++");

item.setTitle(tempVal);

}

}

结合所有这些：

现在让我们看一下活动

public void oncreate(){

// Do something or mostly the basic code

// Call the class to initate the connection and get the data

FetchList fl = new FetchList();

fl.execute();

}

//Always better to use async task for these purposes

public class FetchList extends asyncTask{

doinbackground{

// this was explained in first step

Response res = new Response("url");

String response = res.getResponse();

XmlParser xml = new XmlParser(response);

ArrayList itemList = xml.getItemList();

xml.parse();

}

}

好了，仅此而已。

2020-07-27