-5
我的XML解析器不想显示.. 这是我的代码，XML解析器NetworkOnMainThreadException（再次）
public class XMLParser {
public XMLParser(){
}
public String getXmlFromUrl (String url){
String xml = null;
try {
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpPost = new HttpGet(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;
}
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) {
// TODO: handle exception
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;
}
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 "";
}
public String getValue (Element item, String str){
NodeList n = item.getElementsByTagName(str);
return this.getElementValue(n.item(0));
}
}
，这是我的主要
public class MainActivity extends ListActivity {
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
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String,String>>();
XMLParser parser = new XMLParser();
String xml = parser.getXmlFromUrl(URL);
Document doc = parser.getDomElement(xml);
NodeList nl = doc.getElementsByTagName(KEY_ITEM);
for (int i = 0; i < nl.getLength(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
Element e = (Element) nl.item(i);
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));
menuItems.add(map);
}
ListAdapter adapter = new SimpleAdapter(this, menuItems,
R.layout.list_item,
new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
R.id.name, R.id.desciption, R.id.cost });
setListAdapter(adapter);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
}
，这是错误
07-23 01:58:08.649: E/AndroidRuntime(1347): FATAL EXCEPTION: main
07-23 01:58:08.649: E/AndroidRuntime(1347): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.tr.tryjson/com.tr.tryjson.MainActivity}: android.os.NetworkOnMainThreadException
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2180)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2230)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread.access$600(ActivityThread.java:141)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1234)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.os.Handler.dispatchMessage(Handler.java:99)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.os.Looper.loop(Looper.java:137)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread.main(ActivityThread.java:5039)
07-23 01:58:08.649: E/AndroidRuntime(1347): at java.lang.reflect.Method.invokeNative(Native Method)
07-23 01:58:08.649: E/AndroidRuntime(1347): at java.lang.reflect.Method.invoke(Method.java:511)
07-23 01:58:08.649: E/AndroidRuntime(1347): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793)
07-23 01:58:08.649: E/AndroidRuntime(1347): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560)
07-23 01:58:08.649: E/AndroidRuntime(1347): at dalvik.system.NativeStart.main(Native Method)
07-23 01:58:08.649: E/AndroidRuntime(1347): Caused by: android.os.NetworkOnMainThreadException
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
07-23 01:58:08.649: E/AndroidRuntime(1347): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
07-23 01:58:08.649: E/AndroidRuntime(1347): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
07-23 01:58:08.649: E/AndroidRuntime(1347): at java.net.InetAddress.getAllByName(InetAddress.java:214)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
07-23 01:58:08.649: E/AndroidRuntime(1347): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
07-23 01:58:08.649: E/AndroidRuntime(1347): at com.tr.tryjson.JsonParser.getJSONFromUrl(JsonParser.java:37)
07-23 01:58:08.649: E/AndroidRuntime(1347): at com.tr.tryjson.MainActivity.onCreate(MainActivity.java:48)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.Activity.performCreate(Activity.java:5104)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
07-23 01:58:08.649: E/AndroidRuntime(1347): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2144)
07-23 01:58:08.649: E/AndroidRuntime(1347): ... 11 more
请帮助我..
1.阅读你的logcat。 2. Google“NetworkOnMainThreadException”。 3.当你尝试实现一个AsyncTask并且仍然失败时回到这里。 – 323go