Webserver 到 android XML 解析

Posted 2023-04-19

【中文标题】Webserver 到 android XML 解析

【英文标题】：Webserver to android XML parsing

【发布时间】：2018-01-04 17:44:43

【问题描述】：

我的 dot-net Web 服务器正在返回一个 XML。 我想在安卓应用中显示数据。

如何进行？

我有一个 SOAP 类，它获取 XML 作为响应并返回响应。如何在列表视图中解析该响应？

public String getAllDetails()        
    StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder()
            .permitAll().build();
    StrictMode.setThreadPolicy(policy);
    // Create the envelop.Envelop will be used to send the request
    SoapSerializationEnvelope envelope = new SoapSerializationEnvelope(
            SoapEnvelope.VER11);
    envelope.setOutputSoapObject(request);
    // Says that the soap webservice is a .Net service
    envelope.dotNet = true;
    HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
    String s = "";       
    androidHttpTransport.debug=true;
    androidHttpTransport.setXmlVersionTag("<?xml version=\"1.0\" encoding=\"utf-8\"?>");
    try 
        androidHttpTransport.call(SOAP_ACTION, envelope);
        SoapPrimitive response = (SoapPrimitive) envelope.getResponse(); 
        s = response.toString();           
        Log.d("Converter", response.toString());
     catch (Exception e) 
        e.printStackTrace();
    
    return s;

【参考方案1】：

您将需要创建一个 XMLParser.java 文件，该文件将使您能够解析您的 XML。然后使用相应的方法解析您的响应 XML 输出并将它们显示为 ListView、GridView、CardView 等。请参阅下面的代码，在解析 XML 时总是对我有用。

//--------------------------------------------------------------
//** XML Output
//--------------------------------------------------------------

<?xml version="1.0" encoding="UTF-8"?>
<menu>
    <item>
        <id>1</id>
        <name>Manchester United</name>
    </item>
    <item>
        <id>2</id>
        <name>Barcelona</name>
    </item>
    <item>
        <id>3</id>
        <name>Real Madrid</name>
    </item>
    <item>
        <id>4</id>
        <name>Arsenal</name>
    </item>
</menu>

//--------------------------------------------------------------
//** list_item.xml
//--------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_
        android:layout_
        android:orientation="horizontal">

    <LinearLayout 
        xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_
        android:layout_
        android:orientation="vertical">

    <TextView 
        android:id="@+id/name"
        android:layout_
        android:layout_
        android:textColor="#dc6800"
        android:textSize="16sp"
        android:textStyle="bold"
        android:paddingTop="6dip"
        android:paddingBottom="2dip" />

    </LinearLayout>

</LinearLayout>

//--------------------------------------------------------------
//** main.xml
//--------------------------------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 
    xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_
        android:layout_
        android:orientation="vertical">

    <ListView android:id="@android:id/list"
        android:layout_
        android:layout_/>

</LinearLayout>


//--------------------------------------------------------------
//** XMLParser.java
//--------------------------------------------------------------

public class XMLParser 

    // constructor
    public XMLParser() 

    

    /**
     * Getting XML from URL making HTTP request
     * @param url string
     * */
    public String getXmlFromUrl(String url) 
        String xml = null;

        try 
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            xml = EntityUtils.toString(httpEntity);

         catch (UnsupportedEncodingException e) 
            e.printStackTrace();
         catch (ClientProtocolException e) 
            e.printStackTrace();
         catch (IOException e) 
            e.printStackTrace();
        
        // return XML
        return xml;
    

    /**
     * Getting XML DOM element
     * @param XML string
     * */
    public Document getDomElement(String xml)
        Document doc = null;
        DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
        try 

            DocumentBuilder db = dbf.newDocumentBuilder();

            InputSource is = new InputSource();
            is.setCharacterStream(new StringReader(xml));
            doc = db.parse(is);

         catch (ParserConfigurationException e) 
            Log.e("Error: ", e.getMessage());
            return null;
         catch (SAXException e) 
            Log.e("Error: ", e.getMessage());
            return null;
         catch (IOException e) 
            Log.e("Error: ", e.getMessage());
            return null;
        

        return doc;
    

    /** Getting node value
     * @param elem element
     */
    public final String getElementValue( Node elem ) 
        Node child;
        if( elem != null)
            if (elem.hasChildNodes())
                for( child = elem.getFirstChild(); child != null; child = child.getNextSibling() )
                    if( child.getNodeType() == Node.TEXT_NODE  )
                        return child.getNodeValue();
                    
                
            
        
        return "";
    

    /**
     * Getting node value
     * @param Element node
     * @param key string
     * */
    public String getValue(Element item, String str) 
        NodeList n = item.getElementsByTagName(str);
        return this.getElementValue(n.item(0));
    


//--------------------------------------------------------------
//** MainActivity.java
//--------------------------------------------------------------

public class MainActivity extends ListActivity 

    // All static variables
    static final String URL = "http://api.foo.foo/foo/?format=xml"; // Your XML output
    // XML node keys
    static final String KEY_ITEM = "item"; // parent node
    static final String KEY_ID = "id";
    static final String KEY_NAME = "name";

    @Override
    public void onCreate(Bundle savedInstanceState) 
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();

        XMLParser parser = new XMLParser();
        String xml = parser.getXmlFromUrl(URL); // getting XML
        Document doc = parser.getDomElement(xml); // getting DOM element

        NodeList nl = doc.getElementsByTagName(KEY_ITEM);
        // looping through all item nodes <item>
        for (int i = 0; i < nl.getLength(); i++) 
            // creating new HashMap
            HashMap<String, String> map = new HashMap<String, String>();
            Element e = (Element) nl.item(i);
            // adding each child node to HashMap key => value
            map.put(KEY_ID, parser.getValue(e, KEY_ID));
            map.put(KEY_NAME, parser.getValue(e, KEY_NAME));

            // adding HashList to ArrayList
            menuItems.add(map);
        

        // Adding menuItems to ListView
        ListAdapter adapter = new SimpleAdapter(this, menuItems,
                R.layout.list_item,
                new String[]  KEY_NAME , new int[] 
                R.id.name );

        setListAdapter(adapter);

        // selecting single ListView item
        ListView lv = getListView();

        lv.setOnItemClickListener(new OnItemClickListener() 

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                                    int position, long id) 
                // getting values from selected ListItem
                String name = ((TextView) view.findViewById(R.id.name)).getText().toString();
            
        );
    

【讨论】：

这不起作用，首先 defaulthttpclient 没有解析，但是当我解决它时，类上有一个删除线，然后网络部分应该在 asyntask 上完成，因为应用程序崩溃并且 logcat 说android.os.NetworkOnMainThreadException。你能推荐点别的吗

它对我有用...只要确保您的 XML 作为 URL 返回并像我上面的示例一样解析它。

我的 sdk 版本是更新版本..所以它不工作..异步任务会这样做..然后检查它