我有以下代码在通知系统中下载文件。但它似乎没有工作......我不确定为什么，一切看起来都很好。调试器给我一个未知的主机错误？
06-02 00:21:15.308: WARN/System.err(4115): java.net.UnknownHostException: phobos.emuparadise.org
06-02 00:21:15.308: WARN/System.err(4115): at java.net.InetAddress.lookupHostByName(InetAddress.java:506)
06-02 00:21:15.308: WARN/System.err(4115): at java.net.InetAddress.getAllByNameImpl(InetAddress.java:294)
06-02 00:21:15.308: WARN/System.err(4115): at java.net.InetAddress.getAllByName(InetAddress.java:256)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:69)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection.<init>(HttpConnection.java:48)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnection$Address.connect(HttpConnection.java:322)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpConnectionPool.get(HttpConnectionPool.java:89)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.getHttpConnection(HttpURLConnectionImpl.java:285)
06-02 00:21:15.308: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.makeConnection(HttpURLConnectionImpl.java:267)
06-02 00:21:15.312: WARN/System.err(4115): at org.apache.harmony.luni.internal.net.www.protocol.http.HttpURLConnectionImpl.connect(HttpURLConnectionImpl.java:205)
06-02 00:21:15.312: WARN/System.err(4115): at co.ezeh.android.romget.ui.ListActivity$RomDownloadTask.doInBackground(ListActivity.java:139)
06-02 00:21:15.312: WARN/System.err(4115): at co.ezeh.android.romget.ui.ListActivity$RomDownloadTask.doInBackground(ListActivity.java:1)
06-02 00:21:15.312: WARN/System.err(4115): at android.os.AsyncTask$2.call(AsyncTask.java:185)
06-02 00:21:15.316: WARN/System.err(4115): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:306)
06-02 00:21:15.316: WARN/System.err(4115): at java.util.concurrent.FutureTask.run(FutureTask.java:138)
06-02 00:21:15.316: WARN/System.err(4115): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1088)
06-02 00:21:15.316: WARN/System.err(4115): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:581)
06-02 00:21:15.320: WARN/System.err(4115): at java.lang.Thread.run(Thread.java:1019)
这是我正在尝试使用的类，虽然我看不出任何错误......
private class RomDownloadTask extends AsyncTask<RomDataSet, Integer, String> {
private PendingIntent pendingIntent;
private Notification notification;
private NotificationManager notificationManager;
@Override
protected String doInBackground(RomDataSet... params) {
try {
//set the download URL, a url that points to a file on the internet
//this is the file to be downloaded
URL url = new URL(params[0].url);
//create the new connection
HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
//set up some things on the connection
urlConnection.setRequestMethod("GET");
urlConnection.setDoOutput(true);
//and connect!
urlConnection.connect();
//set the path where we want to save the file
//in this case, going to save it on the root directory of the
//sd card.
File SDCardRoot = Environment.getExternalStorageDirectory();
//create a new file, specifying the path, and the filename
//which we want to save the file as.
File file = new File(SDCardRoot,"somefile5.zip");
//this will be used to write the downloaded data into the file we created
FileOutputStream fileOutput = new FileOutputStream(file);
//this will be used in reading the data from the internet
InputStream inputStream = urlConnection.getInputStream();
Integer downloadedSize = 0;
Integer totalSize = urlConnection.getContentLength();
//create a buffer...
byte[] buffer = new byte[1024];
int bufferLength = 0; //used to store a temporary size of the buffer
//now, read through the input buffer and write the contents to the file
while ( (bufferLength = inputStream.read(buffer)) > 0 ) {
//add the data in the buffer to the file in the file output stream (the file on the sd card
fileOutput.write(buffer, 0, bufferLength);
//add up the size so we know how much is downloaded
downloadedSize += bufferLength;
//this is where you would do something to report the prgress, like this maybe
publishProgress((downloadedSize / totalSize) * 100);
}
//close the output stream when done
fileOutput.close();
//catch some possible errors...
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPreExecute() {
Intent intent = new Intent(ListActivity.this, ListActivity.class);
pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0, intent, 0);
// configure the notification
notification = new Notification(R.drawable.ic_stat_rom, "Downloading Rom via RomGet", System
.currentTimeMillis());
notification.flags = notification.flags | Notification.FLAG_ONGOING_EVENT;
notification.contentView = new RemoteViews(getApplicationContext().getPackageName(), R.layout.layout_download);
notification.contentIntent = pendingIntent;
notification.contentView.setImageViewResource(R.id.status_icon, R.drawable.icon_rom);
notification.contentView.setTextViewText(R.id.download_description, "Downloading");
notification.contentView.setProgressBar(R.id.download_progress, 100, 0, false);
getApplicationContext();
notificationManager = (NotificationManager) getApplicationContext().getSystemService(
Context.NOTIFICATION_SERVICE);
notificationManager.notify(43, notification);
}
@Override
protected void onProgressUpdate(Integer... progress) {
notification.contentView.setProgressBar(R.id.download_progress, 100, Math.round(progress[0]), false);
//notification.contentView.setTextViewText(R.id.download_description, Integer.toString(downloadedSize));
// inform the progress bar of updates in progress
notificationManager.notify(43, notification);
}
@Override
protected void onPostExecute(String result) {
notification.contentView.setTextViewText(R.id.download_description, "Done");
notificationManager.notify(43, notification);
}
}
干杯
答案 0 :(得分：1)
它尝试连接的网址（phobos.emuparadise.org）显示403 Forbidden（尝试使用浏览器）。如果你解决了这个问题，你应该做得很好。