how to resolve java.lang.string cannot be cast to java.lang.integer android with xml parser

Question

I am trying to parse XML and display it into list view, but after running the app nothing happens -- the list is displayed but not with the XML data . I don't know if I am missing something.

MainActivity class

public class MainActivity extends ListActivity {
// All static variables
static final String URL = "http://api.androidhive.info/pizza/?format=xml";
// XML node keys
static final String KEY_ITEM = "item"; // parent node
static final String KEY_ID = "id";
static final String KEY_NAME = "name";
static final String KEY_COST = "cost";
static final String KEY_DESC = "description";

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    if (android.os.Build.VERSION.SDK_INT > 9) {
        StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
        StrictMode.setThreadPolicy(policy);
    }
    ListView myList=(ListView)findViewById(android.R.id.list);

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

    XMLParser parser = new XMLParser();
    String xml = null; // getting XML
    try {
        xml = parser.getXmlFormUrl(URL);
    } catch (IOException e) {
        e.printStackTrace();
    }
    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));
        map.put(KEY_COST, "Rs." + parser.getValue(e, KEY_COST));
        map.put(KEY_DESC, parser.getValue(e, KEY_DESC));

        // adding HashList to ArrayList
        menuItems.add(map);
    }
    // Adding menuItems to ListView
    ListAdapter adapter = new SimpleAdapter(this, menuItems,
            R.layout.activity_main,
            new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
            R.id.name, R.id.desciption, R.id.cost });

    setListAdapter(adapter);
    // selecting single ListView item

}

}

XmlParser class

 public class XMLParser {
    String result;
    public String getXmlFormUrl(String link) throws IOException{
    URL url=new URL(link.toString());
    HttpURLConnection UrlConnection= (HttpURLConnection)     url.openConnection();
    int status=UrlConnection.getResponseCode();
    if(status==200){
        InputStream inputStream=UrlConnection.getInputStream();
        BufferedReader bufferedReader=new BufferedReader(new     InputStreamReader(inputStream,"UTF8"));
        StringBuilder stringBuilder= new StringBuilder();
        String line;
        while ((line=bufferedReader.readLine())!=null){
            stringBuilder.append((line+"\n"));
        }
        result=stringBuilder.toString();
        inputStream.close();
    }
    return  result;
}
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 DOM
    return doc;
}
public String getValue(Element item, String str) {
    NodeList n = item.getElementsByTagName(str);
    return this.getElementValue(n.item(0));
}

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 "";
}

}

ActivityMain.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="android.prgguru.com.xmlparsingg.MainActivity">

    <ListView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@android:id/list"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="73dp" />
</RelativeLayout>

logcat

2/? E/ActivityThread: Service com.google.android.gms.car.CarService has leaked ServiceConnection com.google.android.gms.car.hr@3bb3cd94 that was originally bound here
                                                   android.app.ServiceConnectionLeaked: Service com.google.android.gms.car.CarService has leaked ServiceConnection com.google.android.gms.car.hr@3bb3cd94 that was originally bound here
                                                       at android.app.LoadedApk$ServiceDispatcher.<init>(LoadedApk.java:1083)
                                                       at android.app.LoadedApk.getServiceDispatcher(LoadedApk.java:977)
                                                       at android.app.ContextImpl.bindServiceCommon(ContextImpl.java:1779)
                                                       at android.app.ContextImpl.bindService(ContextImpl.java:1762)
                                                       at android.content.ContextWrapper.bindService(ContextWrapper.java:539)
                                                       at android.content.ContextWrapper.bindService(ContextWrapper.java:539)
                                                       at android.content.ContextWrapper.bindService(ContextWrapper.java:539)
                                                       at com.google.android.gms.common.stats.g.a(:com.google.android.gms:128)
                                                       at com.google.android.gms.common.stats.g.a(:com.google.android.gms:145)
                                                       at com.google.android.gms.car.hc.<init>(:com.google.android.gms:319)
                                                       at com.google.android.gms.car.CarChimeraService.onCreate(:com.google.android.gms:74)
                                                       at com.google.android.chimera.container.ServiceProxy.setImpl(:com.google.android.gms:119)
                                                       at com.google.android.chimera.container.ServiceProxy.onCreate(:com.google.android.gms:109)
                                                       at android.app.ActivityThread.handleCreateService(ActivityThread.java:2825)
                                                       at android.app.ActivityThread.access$1800(ActivityThread.java:156)
                                                       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1434)
                                                       at android.os.Handler.dispatchMessage(Handler.java:102)
                                                       at android.os.Looper.loop(Looper.java:211)
                                                       at android.app.ActivityThread.main(ActivityThread.java:5373)
                                                       at java.lang.reflect.Method.invoke(Native Method)
                                                       at java.lang.reflect.Method.invoke(Method.java:372)
                                                       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1020)
                                                       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:815)

Please include the stacktrace and the xml you're trying to parse. — f1sh
– f1sh, Commented Apr 11, 2016 at 11:26
api.androidhive.info/pizza/?format=xml this is the url of xml — developer
– developer, Commented Apr 11, 2016 at 11:33
@NielsMasdorp java.lang.string cannot be cast to java.lang.integer — developer
– developer, Commented Apr 11, 2016 at 11:41

cmaher · Accepted Answer · 2018-03-31 13:58:44Z

23

You cannot directly change or reference your String object to Integer type because there is no parent-child relationship between these two classes.

If you try to cast a String to a Integer in such a way, it will raise a ClassCastException.

String someValue = "123";
Integer intValue = (Integer) someValue; // ClassCastException Raise.

So if you want to change or reference a String Variable to Integer, you must use parsing techniques.

int intValue = Integer.parseInt(someValue); //this code will work for this.

edited Mar 31, 2018 at 13:58

cmaher

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answered Apr 11, 2016 at 12:53

Vikrant Kashyap

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Comments

marti201 · Accepted Answer · 2016-04-11 11:36:19Z

2

If you have a String and you are sure that the only thing in it is a whole number without spaces, you can use Integer.parseInt(String) to convert it to an integer. This method will throw an exception if the string isn't just the number.

answered Apr 11, 2016 at 11:36

marti201

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