android - InputStream returns empty file when downloading a PDF -

-

so i'm trying download pdf file using httpurlconnection , think i've done right input- , outputstreams, yet when open downloaded pdf file (using built in file manager in android and/or adb), or inspect transferring os x, it's empty , size shows 0 bytes.

the site i'm trying download pdf is:

http://www.pdf995.com/samples/pdf.pdf

here's code

    public static void downloadfile(final string fileurl, final file directory) {      thread thread = new thread(new runnable(){         @override         public void run() {             try {                  try {                     fileoutputstream f = new fileoutputstream(directory);                     url u = new url(fileurl);                     c = (httpurlconnection) u.openconnection();                     c.setrequestmethod("get");                     //c.setrequestproperty("content-type", "application/pdf");                     //c.setdooutput(true);                     c.connect();                     log.d("debugz", integer.tostring(c.getcontentlength()));                      inputstream in = c.getinputstream();                      byte[] buffer = new byte[1024];                     int len1 = 0;                     while ((len1 = in.read(buffer)) > 0) {                         f.write(buffer, 0, len1);                     }                     f.flush();                     f.getfd().sync();                     f.close();                   } catch (exception e) {                     e.printstacktrace();                 }               } catch (exception e) {                 e.printstacktrace();             }         }     });      thread.start();   }   public static string getpdf(string pdfurl) {      string extstoragedirectory = environment.getexternalstoragedirectory()             .tostring();     file folder = new file(extstoragedirectory, "schematisktscheman");     folder.mkdir();     file file = new file(folder, "schemainfo.pdf");     try {         file.createnewfile();     } catch (ioexception e1) {         e1.printstacktrace();     }     downloadfile(pdfurl, file);      return null; //added return }

in main activity:

schedulepdfprocessor.getpdf("http://www.pdf995.com/samples/pdf.pdf"); sendbroadcast(new intent(intent.action_media_scanner_scan_file, uri.parse("file://" + environment.getexternalstoragedirectory() + "/schematisktscheman/schemainfo.pdf")));

edit: ran network code on main thread, threw exception. creating new thread downloading , gets example pdf (http://www.pdf995.com/samples/pdf.pdf) , puts content in file fine. @greenapps!

first, replace:

f.close();

with:

f.flush(); f.getfd().sync(); f.close();

this ensures written disk before continuing.

then, need use mediascannerconnection , scanfile() mediastore know updated file.


Comments

Post a Comment

Popular posts from this blog

c# - How Configure Devart dotConnect for SQLite Code First? -

-
can configure following sample code ? when run following code, error : no entity framework provider found ado.net provider invariant name 'devart.data.sqlite' setting in machine.config <system.data> <dbproviderfactories> <add name="dotconnect sqlite" invariant="devart.data.sqlite" description="devart dotconnect sqlite" type="devart.data.sqlite.sqliteproviderfactory, devart.data.sqlite, version=4.6.287.0, culture=neutral, publickeytoken=09af7300eec23701" /> </dbproviderfactories> </system.data> after add below block code in app.config <?xml version="1.0"?> <configuration>   <configsections> <!-- more information on entity framework configuration, visit http://go.microsoft.com/fwlink/?linkid=237468 --> <section name="entityframework" type="system.data.entity.internal.configfile.entityframeworksection, entit...
Read more

java - Copying object fields -

-
what best way of copying classes when need have 2 independent variables? have simple class: public class myclass { boolean = false; string b= "not empty"; } do need make method : assign(myclass data ) { a= data.a; b= data.b; } is there automatic method copy (duplicate) objects in java? do need make method : pretty close. instead of making method, should make constructor. such constructors called copy constructor , , create them this: myclass(myclass data) { = data.a; b = data.b; } and create copy of instance, use constructor this: myclass obj1 = new myclass(); myclass obj2 = new myclass(obj1); copy constructor can tedious : using copy constructor create deep-copy can tedious, when class has mutable fields. in case, assignment create copy of reference, , not object itself. have create copy of fields (if want deep copy). can go recursive. a better way create deep copy serialize , deserialize object. why not use clone()? ...
Read more

c++ - Clear the memory after returning a vector in a function -

-
i have function processes , stores lot of data in , returns results vector of class. amount of data stored in function tremendous , want clear storage memory of function after finished job. necessary (does function automatically clear memory) or should clear memory function? update: vector<customers> process(char* const *filename, vector<int> id) { vector<customers> list_of_customers; (perform actions) return list_of_customers; } variables defined locally within function automatically released @ end of function scope. destructors objects called, should free memory allocated objects (if objects coded correctly). example of such object std::vector . anything you've allocated new must have corresponding delete release storage. try avoid doing own allocation , use raii instead, i.e. containers or smart pointers.
Read more