这是我在这里的第一篇文章，我希望我做得好......
我正在尝试编辑一个开源更新程序（YAOS Updater），当我尝试连接时，它给了我一个错误。
我会尽力解释一下。
我在用于列出所有文件的JSON中添加了一个值。每个文件的新值是urlArchivo，其中包含文件的完整URL。
这是代码的一部分：
package org.yaosupdater.services;
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;
import org.yaosupdater.R;
import android.annotation.TargetApi;
import android.app.DownloadManager;
import android.app.DownloadManager.Query;
import android.app.DownloadManager.Request;
import android.app.Service;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.SharedPreferences;
import android.database.Cursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;
@TargetApi(16)
public class DownloadService extends Service{
private DownloadManager dm;
private String nombre;
private String archivo;
private String urlArchivo;
private String[] mirrors;
private long enqueue;
@Override
public IBinder onBind(Intent intent) {
// TODO Auto-generated method stub
return null;
}
@Override
public void onStart(Intent intent, int startid){
super.onStart(intent, startid);
dm = (DownloadManager) getSystemService(DOWNLOAD_SERVICE);
Bundle bundle = intent.getExtras();
nombre = (String) bundle.get("nombre");
Log.d("Dexafree", "Nombre: " +nombre);
archivo = (String) bundle.get("archivo");
Log.d("Dexafree", "Archivo: " +archivo);
urlArchivo = (String) bundle.getString("urlArchivo");
Log.d("Dexafree", "urlArchivo: " +urlArchivo);
mirrors = (String[]) bundle.get("mirrors");
URL url;
int j = 0;
boolean found = false;
while((j < mirrors.length)&&(!found)){
try {
url = new URL(urlArchivo);
Log.d("Dexafree", "Intentando conectar a: " +urlArchivo);
//url = new URL(urlArchivo);
//Log.d("Dexafree", "Intentando conectar a: " +urlArchivo);
URLConnection urlCon = url.openConnection();
Log.d("Dexafree", "Conexion abierta a: " +urlCon);
Log.d("Dexafree", "Debe ser igual a: " + urlArchivo);
InputStreamReader is = new InputStreamReader(urlCon.getInputStream());
found = true;
} catch (MalformedURLException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
Log.d("MIUIEsUpdater", "El archivo " +urlArchivo +" no se encontró.");
found = false;
}
j++;
}
j--;
logcat中的变量urlArchivo获取正确的URL，我的意思是
Log.d("Dexafree", "Intentando conectar a: " +urlArchivo);
返回文件的正确完整URL，但是FC，显示下一个logcat
08-19 14:51:40.417: E/Trace(4134): error opening trace file: No such file or directory (2)
08-19 14:51:40.449: D/Dexafree(4134): Nombre: MODEM KF1
08-19 14:51:40.453: D/Dexafree(4134): Archivo: Modem_KF1.zip
08-19 14:51:40.453: D/Dexafree(4134): urlArchivo: http://content.wuala.com/contents/elitemovil/Galaxy_S/GT-I9000/carpetaprueba/Modem_KF1.zip
08-19 14:51:40.453: D/Dexafree(4134): Intentando conectar a: http://content.wuala.com/contents/elitemovil/Galaxy_S/GT-I9000/carpetaprueba/Modem_KF1.zip
08-19 14:51:40.453: D/Dexafree(4134): Conexion abierta a: libcore.net.http.HttpURLConnectionImpl:http://content.wuala.com/contents/elitemovil/Galaxy_S/GT-I9000/carpetaprueba/Modem_KF1.zip
08-19 14:51:40.453: D/Dexafree(4134): Debe ser igual a: http://content.wuala.com/contents/elitemovil/Galaxy_S/GT-I9000/carpetaprueba/Modem_KF1.zip
08-19 14:51:40.457: D/AndroidRuntime(4134): Shutting down VM
08-19 14:51:40.457: W/dalvikvm(4134): threadid=1: thread exiting with uncaught exception (group=0x40edb300)
08-19 14:51:40.500: E/AndroidRuntime(4134): FATAL EXCEPTION: main
08-19 14:51:40.500: E/AndroidRuntime(4134): java.lang.RuntimeException: Unable to start service org.yaosupdater.services.DownloadService@416c0c38 with Intent { cmp=org.yaosupdater/.services.DownloadService (has extras) }: android.os.NetworkOnMainThreadException
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2507)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.ActivityThread.access$1900(ActivityThread.java:130)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1292)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.os.Handler.dispatchMessage(Handler.java:99)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.os.Looper.loop(Looper.java:137)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.ActivityThread.main(ActivityThread.java:4745)
08-19 14:51:40.500: E/AndroidRuntime(4134): at java.lang.reflect.Method.invokeNative(Native Method)
08-19 14:51:40.500: E/AndroidRuntime(4134): at java.lang.reflect.Method.invoke(Method.java:511)
08-19 14:51:40.500: E/AndroidRuntime(4134): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:786)
08-19 14:51:40.500: E/AndroidRuntime(4134): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:553)
08-19 14:51:40.500: E/AndroidRuntime(4134): at dalvik.system.NativeStart.main(Native Method)
08-19 14:51:40.500: E/AndroidRuntime(4134): Caused by: android.os.NetworkOnMainThreadException
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.os.StrictMode$AndroidBlockGuardPolicy.onNetwork(StrictMode.java:1117)
08-19 14:51:40.500: E/AndroidRuntime(4134): at java.net.InetAddress.lookupHostByName(InetAddress.java:385)
08-19 14:51:40.500: E/AndroidRuntime(4134): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:236)
08-19 14:51:40.500: E/AndroidRuntime(4134): at java.net.InetAddress.getAllByName(InetAddress.java:214)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:70)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpConnection.<init>(HttpConnection.java:50)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpConnection$Address.connect(HttpConnection.java:341)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpConnectionPool.get(HttpConnectionPool.java:87)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpConnection.connect(HttpConnection.java:128)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpEngine.openSocketConnection(HttpEngine.java:315)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpEngine.connect(HttpEngine.java:310)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpEngine.sendSocketRequest(HttpEngine.java:289)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpEngine.sendRequest(HttpEngine.java:239)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpURLConnectionImpl.getResponse(HttpURLConnectionImpl.java:273)
08-19 14:51:40.500: E/AndroidRuntime(4134): at libcore.net.http.HttpURLConnectionImpl.getInputStream(HttpURLConnectionImpl.java:168)
08-19 14:51:40.500: E/AndroidRuntime(4134): at org.yaosupdater.services.DownloadService.onStart(DownloadService.java:73)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.Service.onStartCommand(Service.java:450)
08-19 14:51:40.500: E/AndroidRuntime(4134): at android.app.ActivityThread.handleServiceArgs(ActivityThread.java:2490)
08-19 14:51:40.500: E/AndroidRuntime(4134): ... 10 more
我希望我发布了解决此问题所需的所有信息。如果需要更多信息，请告诉我们！
答案 0 :(得分：2)
Android抛出android.os.NetworkOnMainThreadException，因为......
应用程序尝试执行时抛出的异常 在其主线程上进行网络操作。
这仅适用于针对Honeycomb SDK或。的应用程序 更高。允许使用早期SDK版本的应用程序 他们的主要事件循环线程上的网络，但它是很重要的 气馁。
为您的网络操作创建一个单独的线程，它基本上告诉您。
可能长时间运行的操作，例如网络或数据库 操作，或计算上昂贵的计算，如调整大小 位图应该在子线程中完成
请注意，服务与其他应用程序对象一样，在main中运行 他们的托管过程的线程。这意味着，如果您的服务是 要做任何CPU密集型（如MP3播放）或阻塞（如此 作为网络）操作，它应该在其中产生自己的线程 做那件事。
你可以自己调查一下，但是呃 - 下次再做。