java - Trying to rename a folder in extSdCard in my android device using code -

i trying develop , application 2 buttons (show,hide) when click show rename folder .pics pics

and hide button rename pics .pics , run media scanner on every click.

here code dont know error, made alot of searches in here non solved problem

button btnshow = (button) findviewbyid(r.id.btnshow);  //rename folder vids string sdcard = new string("/storage/sdcard1/"); file = new file(sdcard, (".pics")); file = new file(sdcard, ("pics")); from.renameto(to);  //create on click trigger media scan btnshow.setonclicklistener(new onclicklistener() {     @override     public void onclick(view view) {         //broadcast media scanner intent trigger         sendbroadcast(new intent(intent.action_media_mounted,                 uri.parse("file://" + environment.getexternalstoragedirectory())));          //send message         toast toast = toast.maketext(getapplicationcontext(), "media scanner triggered....", toast.length_short);         toast.show();     } }); 

i specified path of extsdcard before using environment show normal sdcard , not external sd.

when run on phone media scanner triggered, , folder not renamed.

thanks

you need following permission make changes on sd card

<uses-permission android:name="android.permission.write_external_storage" />