android - Pdf file disappears after downloading from firebase storage -


i trying upload pdf file firebase storage. after uploading file,it must download same file storage , display in pdf view.the problem press button , come again view file disappears pdf view. code using:

@override     protected void onactivityresult(int requestcode, int resultcode, intent data) {         super.onactivityresult(requestcode, resultcode, data);          if (requestcode == pickfile_request_code && resultcode == result_ok && data != null && data.getdata() != null) {             uri uri = data.getdata();              final storagereference filepath=storageref.child("folder").child(uri.getlastpathsegment());             uploadtask uploadtask=filepath.putfile(uri);             uploadtask.addonsuccesslistener(new onsuccesslistener<uploadtask.tasksnapshot>() {                 @override                 public void onsuccess(uploadtask.tasksnapshot tasksnapshot) {                     @suppresswarnings("visiblefortests") uri downloadurl = tasksnapshot.getdownloadurl();                     try {                         final file localfile=file.createtempfile("filename","pdf");                         filepath.getfile(localfile).addonsuccesslistener(new onsuccesslistener<filedownloadtask.tasksnapshot>() {                             @override                             public void onsuccess(filedownloadtask.tasksnapshot tasksnapshot) {                                 pdfview.fromfile(localfile).load();                             }                         }) ;                      } catch (ioexception e) {                         e.printstacktrace();                     }                  }             });         }

i new android programming. appreciated .


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