java - Android AsyncTask use openFileOutputStream -

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i have error in asynctask. tried save data fileoutputstream file, cause need data permanent.

so iam reading tutorial: tutorial

but if iam adding code asynctask error:

"the method openfileoutputstream(string, int) undefined type mainactivity.downloadspielplan"

downloadspielplan asynctask

private class downloadspielplan extends asynctask <void, void, string>     {         @override         protected void onpreexecute() {             // todo auto-generated method stub             super.onpreexecute();         }         @override         protected string doinbackground(void... params) {             // todo auto-generated method stub               //dont wonder reversestring created , filled delete part code more readability               filename = "spieltag";             jour = reversestring;              fileoutputstream fos = openfileoutputstream(filename, context.mode_private);             fos.write(jour.getbytes());             fos.close();               return reversestring;         }          @override         protected void onpostexecute(string reversestring) {             // todo auto-generated method stub             toast.maketext(getapplicationcontext(), "download abgeschlossen!", toast.length_long).show();             super.onpostexecute(reversestring);         }     }

i guess problem is, iam calling openfileoutputstream asynctask, cant find solution how fix it. (cause iam realy new in android)

method name openfileoutput, not openfileoutputstream

call

mainactivity.this.openfileoutput(filename, context.mode_private)

instead of 

openfileoutputstream(filename, context.mode_private)

in doinbackground method.


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