android - Need to find the location of .txt file in the root SD card -


i attempting write longitude , latitude values text file each time location changes. result of should text file, stored on sd card, contains list of longitude , latitude values. application gets longitude , latitude , toast notification pops saying file has been saved successfully. however, cannot find text file in root of sd card.

here code:

import java.io.file; import java.io.fileoutputstream; import java.io.outputstreamwriter;  import android.location.location; import android.location.locationlistener; import android.location.locationmanager; import android.os.bundle; import android.app.activity; import android.content.context; import android.widget.textview; import android.widget.toast;  public class mainactivity extends activity  { textview textlat; textview textlong;  @override protected void oncreate(bundle savedinstancestate)  {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);      textlat = (textview)findviewbyid(r.id.textlat);     textlong = (textview)findviewbyid(r.id.textlong);      locationmanager lm = (locationmanager)getsystemservice(context.location_service);     locationlistener ll = new mylocationlistener();     lm.requestlocationupdates(locationmanager.gps_provider,              10000, 0, ll); }  private class mylocationlistener implements locationlistener {      @override     public void onlocationchanged(location location)      {         if (location != null)         {             double plong = location.getlongitude();             double plat = location.getlatitude();              textlat.settext(double.tostring(plat));             textlong.settext(double.tostring(plong));              try              {                 file myfile = new file("/sdcard/mysdfile.txt");                 myfile.createnewfile();                 fileoutputstream fout = new fileoutputstream(myfile);                 outputstreamwriter myoutwriter =                                          new outputstreamwriter(fout);                 myoutwriter.append(textlat.gettext());                  myoutwriter.close();                 fout.close();                 toast.maketext(getbasecontext(),                         "done writing sd 'mysdfile.txt'",                         toast.length_short).show();             }              catch (exception e)              {                 toast.maketext(getbasecontext(), e.getmessage(),                         toast.length_short).show();             }         }     }      @override     public void onproviderdisabled(string provider)      {      }      @override     public void onproviderenabled(string provider)      {       }      @override     public void onstatuschanged(string provider, int status,             bundle extras)      {      }        } }

so basically, file location values? feel i'm missing obvious here...

you should not try write root folder of sdcard. fail due security issues. try instead:

file dir = environment.getexternalstoragepublicdirectory(); file myfile = new file(dir, "mysdfile.txt");

you can later find file in directory dir. if want file private app, use context.getexternalfilesdir() instead of environment.getexternalstoragepublicdirectory().

also check out guide topic on storage options


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