sqlite - Android - Create Multiple Exported Databases And Allow User To Select Which One To Import -

i have following code used create backup of sqlite database;

    file sd = environment.getexternalstoragedirectory();     file data = environment.getdatadirectory();     filechannel source = null;     filechannel destination = null;     string currentdbpath = "/data/com.sjhdevelopment.shaunharrison.myejuiceapp/databases/ejuicedata.db";     string backupdbpath = "ejuicedata.db";       file currentdb = new file(data,currentdbpath);     file backupdb = new file(sd,backupdbpath);      try     {         source = new fileinputstream(currentdb).getchannel();         destination = new fileoutputstream(backupdb).getchannel();         destination.transferfrom(source,0,source.size());         source.close();         destination.close();         toast.maketext(this, "db exported", toast.length_long).show();     }     catch(exception e)     {         showerror("error", e.getmessage());     } 

and have following code import sqlite database

 file sd = environment.getexternalstoragedirectory();  file data = environment.getdatadirectory();   if(sd.canwrite())  {    string currentdbpath="/data/com.sjhdevelopment.shaunharrison.myejuiceapp/databases/ejuicedata.db";    string backupdbpath = "ejuicedata.db";    file backupdb = new file (data,currentdbpath);    file currentdb = new file(sd, backupdbpath);     try {          filechannel src =new fileinputstream(currentdb).getchannel();          filechannel dst = new fileoutputstream(backupdb).getchannel();          dst.transferfrom(src, 0, src.size());          src.close();          dst.close();          toast.maketext(getbasecontext(), "db imported", toast.length_long).show();        }    catch(exception e)    {          showerror("error", e.getmessage());    } 

my problem want user able make multiple backups instead of one, know how can todays date via following;

    calendar calendar = calendar.getinstance();     date today = calendar.gettime();     dateformat dateformat = new simpledateformat("dd/mmm/yyyy");     string todayasstring = dateformat.format(today); 

but in code export code todayasstring go?

also when comes importing how allow user browse files select backup import?

thanks

you can use dialogs. single choice looking for.