我启动了一个应用程序，它通过php脚本从数据库中检索数据，将它们显示为列表。
我的问题是应用程序在启动时崩溃了。我不了解logcat，因为我从java开始。
这是logcat：
05-19 15:28:33.650: W/dalvikvm(1018): threadid=1: thread exiting with uncaught exception (group=0xb3a3aba8)
05-19 15:28:33.680: E/AndroidRuntime(1018): FATAL EXCEPTION: main
05-19 15:28:33.680: E/AndroidRuntime(1018): Process: gsb.listegsb, PID: 1018
05-19 15:28:33.680: E/AndroidRuntime(1018): java.lang.RuntimeException: Unable to start activity ComponentInfo{gsb.listegsb/gsb.listegsb.MainActivity}: android.os.NetworkOnMainThreadException
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2195)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2245)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread.access$800(ActivityThread.java:135)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1196)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.os.Handler.dispatchMessage(Handler.java:102)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.os.Looper.loop(Looper.java:136)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread.main(ActivityThread.java:5017)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.lang.reflect.Method.invokeNative(Native Method)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.lang.reflect.Method.invoke(Method.java:515)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:779)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:595)
05-19 15:28:33.680: E/AndroidRuntime(1018): at dalvik.system.NativeStart.main(Native Method)
05-19 15:28:33.680: E/AndroidRuntime(1018): Caused by: android.os.NetworkOnMainThreadException
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1145)
05-19 15:28:33.680: E/AndroidRuntime(1018): at libcore.io.BlockGuardOs.connect(BlockGuardOs.java:84)
05-19 15:28:33.680: E/AndroidRuntime(1018): at libcore.io.IoBridge.connectErrno(IoBridge.java:127)
05-19 15:28:33.680: E/AndroidRuntime(1018): at libcore.io.IoBridge.connect(IoBridge.java:112)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:192)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:459)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.net.Socket.connect(Socket.java:843)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.Platform.connectSocket(Platform.java:131)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.Connection.connect(Connection.java:101)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpEngine.connect(HttpEngine.java:294)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpEngine.sendSocketRequest(HttpEngine.java:255)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpEngine.sendRequest(HttpEngine.java:206)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpURLConnectionImpl.execute(HttpURLConnectionImpl.java:345)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:296)
05-19 15:28:33.680: E/AndroidRuntime(1018): at com.android.okhttp.internal.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:179)
05-19 15:28:33.680: E/AndroidRuntime(1018): at java.net.URL.openStream(URL.java:470)
05-19 15:28:33.680: E/AndroidRuntime(1018): at model.Passerelle.getLesVis(Passerelle.java:31)
05-19 15:28:33.680: E/AndroidRuntime(1018): at gsb.listegsb.MainActivity.onCreate(MainActivity.java:34)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.Activity.performCreate(Activity.java:5231)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1087)
05-19 15:28:33.680: E/AndroidRuntime(1018): at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2159)
05-19 15:28:33.680: E/AndroidRuntime(1018): ... 11 more
和Manifest：
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="gsb.listegsb"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET"/>
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="gsb.listegsb.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>
</manifest>
MainActivity：
package gsb.listegsb;
import java.util.List;
import model.Passerelle;
import android.support.v7.app.ActionBarActivity;
import android.support.v7.app.ActionBar;
import android.support.v4.app.Fragment;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.os.Build;
public class MainActivity extends ActionBarActivity {
List<String> lesVis;
ListView lvListe;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
if (savedInstanceState == null) {
getSupportFragmentManager().beginTransaction()
.add(R.id.container, new PlaceholderFragment())
.commit();
}
lesVis = Passerelle.getLesVis();
lvListe = (ListView)findViewById(R.id.listViewDep);
// Création de l'adapter
ArrayAdapter<String> adapter = new ArrayAdapter<String>(this, android.R.layout.simple_list_item_1, lesVis);
lvListe.setAdapter(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;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class PlaceholderFragment extends Fragment {
public PlaceholderFragment() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.fragment_main, container, false);
return rootView;
}
}
}
不同的课程：
package model;
public class Visiteur {
private String matricule;
public Visiteur(String matricule)
{
this.matricule = matricule;
}
public String getMatricule()
{
return matricule;
}
}
Rapport：
package model;
public class Rapport {
private String matricule;
private int numRap;
private int numPract;
private String bilan;
private String motif;
public Rapport(String matricule, int numRap, int numPract, String bilan, String motif)
{
this.matricule = matricule;
this.numRap = numRap;
this.numPract = numPract;
this.bilan = bilan;
this.motif = motif;
}
public String getMatricule()
{
return matricule;
}
public int getNumRap()
{
return numRap;
}
public int getNumPract()
{
return numPract;
}
public String getBilan()
{
return bilan;
}
public String getMotif()
{
return motif;
}
}
Passerelle：
package model;
import java.io.IOException;
import java.net.URL;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
public class Passerelle {
private static String _urlVis = "http://10.0.2.2/matricule.php";
public static List<String> getLesVis() {
List<String> lesVis = new ArrayList<String>();
try {
URL myURL = new URL(_urlVis);
Document doc;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(myURL.openStream());
Element racine = doc.getDocumentElement();
NodeList listeVis = racine.getElementsByTagName("visiteur");
for (int i = 0; i < listeVis.getLength(); i++) {
Node visiteur = listeVis.item(i);
NodeList lesProprietes = visiteur.getChildNodes();
// recherche du nom
for (int j = 0; j < lesProprietes.getLength(); j++) {
if (lesProprietes.item(j).getNodeName().equals("matricule")) {
lesVis.add(lesProprietes.item(j).getTextContent().trim());
break;
}
}
}
}
catch (SAXException ex) {
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE, null, ex);
}
catch (ParserConfigurationException ex) {
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE, null, ex);
}
catch (IOException ex) {
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE, null, ex);
}
return lesVis;
}
}
我希望有人可以帮助我。
提前致谢。
答案 0 :(得分：1)
当应用程序尝试在其主线程上执行网络操作时，抛出此异常。在AsyncTask中运行代码：
你的Passerelle应该延长
样品
private abstract class Passerelle extends AsyncTask<String, Void, String> implements OnTaskCompleted
{
List<String> lesVis = new ArrayList<String>();
@Override
protected String doInBackground(String... urls)
{
try
{
URL myURL = new URL(_urlVis);
Document doc;
DocumentBuilderFactory dbf = DocumentBuilderFactory.newInstance();
DocumentBuilder db = dbf.newDocumentBuilder();
doc = db.parse(myURL.openStream());
Element racine = doc.getDocumentElement();
NodeList listeVis = racine.getElementsByTagName("visiteur");
for (int i = 0; i < listeVis.getLength(); i++)
{
Node visiteur = listeVis.item(i);
NodeList lesProprietes = visiteur.getChildNodes();
// recherche du nom
for (int j = 0; j < lesProprietes.getLength(); j++)
{
if (lesProprietes.item(j).getNodeName().equals("matricule"))
{
lesVis.add(lesProprietes.item(j).getTextContent()
.trim());
break;
}
}
}
} catch (SAXException ex)
{
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE,
null, ex);
} catch (ParserConfigurationException ex)
{
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE,
null, ex);
} catch (IOException ex)
{
Logger.getLogger(Passerelle.class.getName()).log(Level.SEVERE,
null, ex);
}
return "";
}
public abstract void onResponseReceived(Lis<String> strings);
@Override
protected void onPostExecute(String result)
{
onResponseReceived(lesVis);
}
}
OnTaskCompleted
public interface OnTaskCompleted
{
public void onResponseReceived(List<String> result);
}
代替您的实际通话
lesVis = Passerelle.getLesVis();
这样做
Passerelle service = new Passerelle()
{
@Override
public void onResponseReceived(List<String> result)
{
lesVis = result;
}
};
service.execute(urlVis);