CSV file attachment gets not sending with email in Android -

i creating app generated .csv file.now sent file using email, mail received not getting file attachment.my code follows.

please me getting wrong.

i have tried link stackoverflow similar

button export;

file    csvdirectory= new file(environment.getexternalstoragedirectory(),"csvfiles");         if(!csvdirectory.exists())         {`enter code here`             csvdirectory.mkdirs();         }         final file csv= new file(csvdirectory, "firstcsv.csv");         try{              if(!csv.exists())              {               csv.createnewfile();               }              path=csv.getpath();  export.setonclicklistener(new onclicklistener() {              @override             public void onclick(view v) {                 sendmail();              }         });  public void sendmail()     {         file f= new file(path);         u1=uri.fromfile(f);         intent sendintent = new intent(intent.action_send);         sendintent.putextra(intent.extra_subject, "person details");         sendintent.putextra(intent.extra_stream, u1);         sendintent.settype("text/html");         startactivity(sendintent);     } 

try in sendmail() instead of text/html

sendintent.settype("text/csv ");