我现在正在构建的应用程序在使用 HTTP post 时出现问题。发生超时时,应用程序崩溃并出现以下错误:
06-20 19:01:35.715: E/Timeout Exception:(3802): java.net.SocketTimeoutException
06-20 19:01:35.720: W/dalvikvm(3802): threadid=15: thread exiting with uncaught exception (group=0x40c4d1f8)
06-20 19:01:35.865: D/dalvikvm(3802): GC_CONCURRENT freed 67K, 18% free 13640K/16519K, paused 7ms+3ms
06-20 19:01:35.870: E/AndroidRuntime(3802): FATAL EXCEPTION: AsyncTask #4
06-20 19:01:35.870: E/AndroidRuntime(3802): java.lang.RuntimeException: An error occured while executing doInBackground()
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.os.AsyncTask$3.done(AsyncTask.java:278)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.FutureTask.run(FutureTask.java:137)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.lang.Thread.run(Thread.java:856)
06-20 19:01:35.870: E/AndroidRuntime(3802): Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.os.Handler.<init>(Handler.java:121)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.app.Dialog.<init>(Dialog.java:107)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.app.AlertDialog.<init>(AlertDialog.java:114)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.app.AlertDialog$Builder.create(AlertDialog.java:913)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.app.AlertDialog$Builder.show(AlertDialog.java:931)
06-20 19:01:35.870: E/AndroidRuntime(3802): at com.on_d_mand.live_evenementen.Helper.showAlert(Helper.java:357)
06-20 19:01:35.870: E/AndroidRuntime(3802): at com.on_d_mand.live_evenementen.SyncData.doInBackground(SyncData.java:99)
06-20 19:01:35.870: E/AndroidRuntime(3802): at com.on_d_mand.live_evenementen.SyncData.doInBackground(SyncData.java:1)
06-20 19:01:35.870: E/AndroidRuntime(3802): at android.os.AsyncTask$2.call(AsyncTask.java:264)
06-20 19:01:35.870: E/AndroidRuntime(3802): at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
06-20 19:01:35.870: E/AndroidRuntime(3802): ... 5 more
这是源的样子:
//ON PRE EXECUTE
protected void onPreExecute(){
if(MESSAGE != null){
dialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
dialog.setMessage(MESSAGE);
dialog.setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}
}
//DO IN BACKGROUND
@Override
protected String doInBackground(String... urls) {
//SYNC DATA WITH THE SERVER
try{
HttpParams httpParameters = new BasicHttpParams();
// Set the timeout in milliseconds (30 seconds) until a connection is established.
// The default value is zero, that means the timeout is not used.
int timeoutConnection = 30 * 1000;
HttpConnectionParams.setConnectionTimeout(httpParameters, timeoutConnection);
// Set the default socket timeout (SO_TIMEOUT)
// in milliseconds (30 seconds) which is the timeout for waiting for data.
int timeoutSocket = 30 * 1000;
HttpConnectionParams.setSoTimeout(httpParameters, timeoutSocket);
HttpClient httpclient = new DefaultHttpClient(httpParameters);
HttpPost httppost = new HttpPost(urls[0]);
httppost.setEntity(new UrlEncodedFormEntity(preparedInformation));
HttpResponse response = httpclient.execute(httppost);
HttpEntity entity = response.getEntity();
IS = entity.getContent();
}catch (SocketTimeoutException ste){
Log.e("Timeout Exception: ", ste.toString());
}
catch(Exception e){
Log.e("log_tag", "Error in http connection"+e.toString());
}
//CONVERT DATA INTO STRING
try{
BufferedReader reader = new BufferedReader(new InputStreamReader(IS,"iso-8859-1"),8);
SB = new StringBuilder();
SB.append(reader.readLine() + "\n");
String line="0";
while ((line = reader.readLine()) != null) {
SB.append(line + "\n\n");
}
IS.close();
this.result = SB.toString();
}
catch(Exception e){
Log.e("log_tag", "Error converting result "+e.toString());
}
return this.result;
}
由 Java RuntimeException 引起...好吧,那又怎样?这个问题需要避免,因为它是我现在拥有的应用程序中的最后一个错误。任何帮助深表感谢。