android- dropbox download files -

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i working on android app support android dropbox api. sending files dropbox folder.now want download files , save sdcard. @ moment when trying download files gives me error 

dropboxserverexception (nginx): 404 not found (file not found)

here code 

public void downloadfiles(string filename){         log.i("filename ",filename);           file mfile=new file(environment.getexternalstoragedirectory().getpath() + "/download1");         try {             fileoutputstream mfileoutputstream=new fileoutputstream(mfile);             dropboxfileinfo mdropboxfileinfo=mapi.getfile(filename, null, mfileoutputstream, null);             } catch (filenotfoundexception e) {             // todo auto-generated catch block             e.printstacktrace();             } catch (dropboxexception e) {             // todo auto-generated catch block             e.printstacktrace();             }     }

filename printing on logcat. , file in photos folder in dropbox. not able download .

the filename problem. need "/photos/" + filename have mentioned inside photos folder not in root.

  dropboxfileinfo mdropboxfileinfo=mapi.getfile("/photos/" + filename, null, mfileoutputstream, null);

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