downloading - Android: Download thread stucks the app -


my android application gets stuck when downloading file until downloading finished. however,the downloading thread inherited aynctask , in background. can have , see wrong , how can modify code in order work?

    private class downloadfiletask extends asynctask<string, integer, string> {      file destfile;      private boolean openafterdownload;     private exception failure;      public downloadfiletask(boolean openafterdownload) {         this.openafterdownload = openafterdownload;     }      @override     protected void onpreexecute() {         super.onpreexecute();                    downloaddialog.setmessage(getstring(r.string.downloading));         downloaddialog.show();     }      @override     protected string doinbackground(string... params) {          try {              string url = params[0];             log.debug("downloading: " + url);              string filename = url.substring(url.lastindexof('/') + 1);              httpparams httpparams = new basichttpparams();             defaulthttpclient client = new defaulthttpclient(httpparams);             client.getcredentialsprovider().setcredentials(                     new authscope(null, -1),                     new usernamepasswordcredentials(user, password));             httpget = new httpget(url);              httpresponse response = client.execute(get);              if (response.getstatusline().getstatuscode() == 200) {                  file destfolder = new file(config.getdownloadsfolder());                 if (!destfolder.exists()) {                     destfolder.mkdirs();                 }                  /**                  * make sure store downloaded files .epub,                   * show in scans later on.                  */                 if ( ! filename.endswith(".epub") ) {                     filename = filename + ".epub";                 }                  destfile = new file(destfolder, urldecoder.decode(filename));                  if (destfile.exists()) {                     destfile.delete();                 }                  // lenghtoffile used calculating download progress                 long lenghtoffile = response.getentity().getcontentlength();                 if(lenghtoffile>=config.getavailablespace())                 {                     this.failure = new exception("not enough space");                     return null;                 }                 // file seen after download                 fileoutputstream f = new fileoutputstream(destfile);                  try {                     // file input url                     inputstream in = response.getentity().getcontent();                      // here's download code                     byte[] buffer = new byte[1024];                     int len1 = 0;                     long total = 0;                      while ((len1 = in.read(buffer)) > 0) {                          // make sure user can cancel download.                         if (iscancelled()) {                             return null;                         }                          total += len1;                         publishprogress((int) ((total * 100) / lenghtoffile));                         f.write(buffer, 0, len1);                     }                 } {                     f.close();                 }              } else {                 this.failure = new runtimeexception(response                         .getstatusline().getreasonphrase());                 log.error("download failed: "                         + response.getstatusline().getreasonphrase());             }          } catch (exception e) {             toast.maketext(getactivity(), e.getmessage() + "1",                     toast.length_long).show();             log.error("download failed.", e);             this.failure = e;         }          return null;     }

although running task in asynctask have lines of code:

    downloaddialog.setmessage(getstring(r.string.downloading));     downloaddialog.show();

in onpreexecute() method, start dialogbox before task self starts.

what more don't see onpostexecute() method in implementation. never .dismiss() dialog. if did application still 'stack' (normal behavior) dialog until download finishes.


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