这是我的第一个问题，很抱歉，如果我不在话题或出错了！ 我正在创建一个Android应用程序，我被困在某个地方.. 我找到了教程并尝试了类似的内容。 方案是我想在我的应用程序中使用XMLParser，并且我使用带有可跳转视图的选项卡。我想在选项卡片段中的列表视图中显示项目。 我已经设法将它们放在listview中，但问题是我无法让它在后台工作。我试过创建新线程，但这不起作用！ 我认为主要活动需要显示fragmentview但它无法返回视图，因为线程仍在进行中！我希望你理解我的问题.. 有谁能够帮我？ 这是我的应用程序的片段类和xmlparser类
gamesfragment.java
public class GamesFragment extends Fragment {
// All static variables
public 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 View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_games, container, false);
setRetainInstance(true);
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));
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(getActivity(), menuItems,R.layout.list_item,
new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
R.id.name, R.id.desciption, R.id.cost });
final ListView lview = (ListView) rootView.findViewById(R.id.lview);
lview.setAdapter(adapter);
// selecting single ListView item
//ListView lv = getListView();
lview.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();
String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString();
// Starting new intent
Intent in = new Intent(getActivity().getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(KEY_NAME, name);
in.putExtra(KEY_COST, cost);
in.putExtra(KEY_DESC, description);
startActivity(in);
}
});
return rootView;
}
}
//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));
}
}
我试图从asynctask扩展我的类并将do请求放在doInBackground中，如下所示
public class GamesFragment extends Fragment {
// All static variables
public 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 View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_games, container, false);
setRetainInstance(true);
ArrayList<HashMap<String, String>> menuItems = new ArrayList<HashMap<String, String>>();
GetStuffFromUrlTask parser1 = new GetStuffFromUrlTask();
// XMLParser parser = new XMLParser();
String xml = parser1.doInBackground(URL); // getting XML
Document doc = parser1.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, parser1.getValue(e, KEY_ID));
map.put(KEY_NAME, parser1.getValue(e, KEY_NAME));
map.put(KEY_COST, "Rs." + parser1.getValue(e, KEY_COST));
map.put(KEY_DESC, parser1.getValue(e, KEY_DESC));
// adding HashList to ArrayList
menuItems.add(map);
}
// Adding menuItems to ListView
ListAdapter adapter = new SimpleAdapter(getActivity(), menuItems,R.layout.list_item,
new String[] { KEY_NAME, KEY_DESC, KEY_COST }, new int[] {
R.id.name, R.id.desciption, R.id.cost });
final ListView lview = (ListView) rootView.findViewById(R.id.lview);
lview.setAdapter(adapter);
// selecting single ListView item
//ListView lv = getListView();
lview.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();
String cost = ((TextView) view.findViewById(R.id.cost)).getText().toString();
String description = ((TextView) view.findViewById(R.id.desciption)).getText().toString();
// Starting new intent
Intent in = new Intent(getActivity().getApplicationContext(), SingleMenuItemActivity.class);
in.putExtra(KEY_NAME, name);
in.putExtra(KEY_COST, cost);
in.putExtra(KEY_DESC, description);
startActivity(in);
}
});
return rootView;
}
private static class GetStuffFromUrlTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String url = params[0];
String xml = "";
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;
}
/**
* 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));
}
}
private static class ParseStuffIGotFromSomeWhereTask extends AsyncTask<String, Void, Boolean> {
@Override
protected Boolean doInBackground(String... params) {
String stringToParse = params[0];
boolean result = new XMLParser().parse(stringToParse);
return result;
}
}
private static class XMLParser {
public boolean parse(String string) {
return true;
}
}
public GamesFragment() {
new GetStuffFromUrlTask() {
@Override
public void onPostExecute(String resultIGotFromTheTask) {
new ParseStuffIGotFromSomeWhereTask() {
@Override
public void onPostExecute(Boolean resultOfTheParseTask) {
Log.i("Parse successful?", resultOfTheParseTask.toString());
}
}.execute(resultIGotFromTheTask);
}
}.execute(URL);
}
/**
* 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));
}
}
我仍然得到如下错误！
04-07 18:23:37.234: E/AndroidRuntime(19673): FATAL EXCEPTION: main
04-07 18:23:37.234: E/AndroidRuntime(19673): android.os.NetworkOnMainThreadException
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.lookupHostByName(InetAddress.java:414)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:249)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.getAllByName(InetAddress.java:227)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.mygit.GamesFragment$GetStuffFromUrlTask.doInBackground(GamesFragment.java:125)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.mygit.GamesFragment.onCreateView(GamesFragment.java:63)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4950)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.LinearLayout.measureVertical(LinearLayout.java:850)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.LinearLayout.onMeasure(LinearLayout.java:579)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4950)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2152)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1851)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1101)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1274)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:999)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4217)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer.doFrame(Choreographer.java:525)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Handler.handleCallback(Handler.java:615)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Looper.loop(Looper.java:137)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.app.ActivityThread.main(ActivityThread.java:4802)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.lang.reflect.Method.invoke(Method.java:511)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:813)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:580)
04-07 18:23:37.234: E/AndroidRuntime(19673): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
04-07 18:23:37.234: E/AndroidRuntime(19673): at dalvik.system.NativeStart.main(Native Method)
04-07 18:23:37.234: E/AndroidRuntime(19673): FATAL EXCEPTION: main
04-07 18:23:37.234: E/AndroidRuntime(19673): android.os.NetworkOnMainThreadException
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.lookupHostByName(InetAddress.java:414)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:249)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.net.InetAddress.getAllByName(InetAddress.java:227)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.DefaultClientConnectionOperator.openConnection(DefaultClientConnectionOperator.java:137)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.AbstractPoolEntry.open(AbstractPoolEntry.java:164)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.conn.AbstractPooledConnAdapter.open(AbstractPooledConnAdapter.java:119)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.DefaultRequestDirector.execute(DefaultRequestDirector.java:360)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:555)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:487)
04-07 18:23:37.234: E/AndroidRuntime(19673): at org.apache.http.impl.client.AbstractHttpClient.execute(AbstractHttpClient.java:465)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.mygit.GamesFragment$GetStuffFromUrlTask.doInBackground(GamesFragment.java:125)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.mygit.GamesFragment.onCreateView(GamesFragment.java:63)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.Fragment.performCreateView(Fragment.java:1478)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:927)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1104)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1460)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentManagerImpl.executePendingTransactions(FragmentManager.java:472)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.app.FragmentPagerAdapter.finishUpdate(FragmentPagerAdapter.java:141)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.populate(ViewPager.java:1068)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.populate(ViewPager.java:914)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.support.v4.view.ViewPager.onMeasure(ViewPager.java:1436)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4950)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.LinearLayout.measureVertical(LinearLayout.java:850)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.LinearLayout.onMeasure(LinearLayout.java:579)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:4950)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.widget.FrameLayout.onMeasure(FrameLayout.java:315)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2152)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.View.measure(View.java:15349)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:1851)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1101)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1274)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:999)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:4217)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer$CallbackRecord.run(Choreographer.java:725)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer.doCallbacks(Choreographer.java:555)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer.doFrame(Choreographer.java:525)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:711)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Handler.handleCallback(Handler.java:615)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Handler.dispatchMessage(Handler.java:92)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.os.Looper.loop(Looper.java:137)
04-07 18:23:37.234: E/AndroidRuntime(19673): at android.app.ActivityThread.main(ActivityThread.java:4802)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.lang.reflect.Method.invokeNative(Native Method)
04-07 18:23:37.234: E/AndroidRuntime(19673): at java.lang.reflect.Method.invoke(Method.java:511)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:813)
04-07 18:23:37.234: E/AndroidRuntime(19673): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:580)
04-07 18:23:37.234: E/AndroidRuntime(19673): at de.robv.android.xposed.XposedBridge.main(XposedBridge.java:115)
04-07 18:23:37.234: E/AndroidRuntime(19673): at dalvik.system.NativeStart.main(Native Method)
04-07 18:23:38.114: D/-heap(19673): GC_CONCURRENT freed 306K, 8% free 10130K/10951K, paused 17ms+2ms, total 64ms
请帮忙！
答案 0 :(得分：0)
解析器不负责从某处获取某些内容，解析器只会解析您提供给他的内容。因此，创建一些专门的东西，如AsyncTask（在后台运行），为您获取的东西，然后是AsyncTask来解析东西。你真的应该看看AsyncTask。看看我的例子......（它应该工作，我实际上没有测试它...... :) 你可能应该看一下Google Volley库，更简单的HTTP内容。
更新：
我包含了片段，（检查onCreateView，虽然您应该寻找比onCreateView更好的地方来启动任务），如何使用xml处理程序获取文档以及如何访问文档的一些注释...（再次，它应该工作，我没有测试这个，它只是告诉你如何做到这一点......）
import java.io.IOException;
import java.io.StringReader;
import java.io.UnsupportedEncodingException;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.util.EntityUtils;
import org.w3c.dom.Document;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import android.app.Fragment;
import android.os.AsyncTask;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
public class GameFragment extends Fragment {
// All static variables
public 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";
private static class GetStuffFromUrlTask extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... params) {
String url = params[0];
String xml = "";
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;
}
}
private static class ParseStuffIGotFromSomeWhereTask extends AsyncTask<String, Void, Document> {
@Override
protected Document doInBackground(String... params) {
String stringToParse = params[0];
Document document = new XMLParser().getDomElement(stringToParse);
return document;
}
}
private static class XMLParser {
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;
}
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.xyz, container, false);
//This is the task we use to parse the XML we got back from the getStuffFromUrlTask
final ParseStuffIGotFromSomeWhereTask parseTask = new ParseStuffIGotFromSomeWhereTask() {
@Override
public void onPostExecute(Document document) {
// here you can access the document that is the result of our parse operation
//document.getElementsByTagName(XYZ)...
}
};
//This is the task we use to get stuff from the URL
GetStuffFromUrlTask getStuffFromUrlTask = new GetStuffFromUrlTask() {
@Override
public void onPostExecute(String result) {
//The task has completed, the string result contains the XML data we got from the URL
parseTask.execute(result); //Now we start the task to parse the xml
}
};
getStuffFromUrlTask.execute(URL);
return rootView;
}
}