storage - how to read data from sd card and display spinner of another activity in android -

i save file in sd card not retrieve data of sd card text file , display on spinner of activity.when click on read button data display on spinner of activity when click on read button txt file item display on spinner

mainactivity.java

btnwritesdfile = (button) findviewbyid(r.id.write); btnwritesdfile.setonclicklistener(new view.onclicklistener() {      public void onclick(view v) {         jour = display.gettext().tostring();         // write on sd card file data in text box         try {             file myfile = new file("/sdcard/mysdfile.txt");             myfile.createnewfile();             fileoutputstream fout = new fileoutputstream(myfile);             outputstreamwriter myoutwriter = new outputstreamwriter(fout);             myoutwriter.append(display.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();         }      } // onclick }); // btnwritesdfile  btnreadsdfile = (button) findviewbyid(r.id.read); btnreadsdfile.setonclicklistener(new view.onclicklistener() {      public void onclick(view v) {         // write on sd card file data in text box         try {             file myfile = new file("/sdcard/mysdfile.txt");             fileinputstream fin = new fileinputstream(myfile);             bufferedreader myreader = new bufferedreader( new inputstreamreader(fin));             string adatarow = "";             string abuffer = "";             while ((adatarow = myreader.readline()) != null) {                 abuffer += adatarow + "\n";             }             display.settext(abuffer);             myreader.close();             toast.maketext(getbasecontext(), "done reading sd 'mysdfile.txt'", toast.length_short).show();         } catch (exception e) {             toast.maketext(getbasecontext(), e.getmessage(), toast.length_short).show();         }     }        });  

list.java

spinner sp1;  @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.list);     sp1 = (spinner) findviewbyid(r.id.spinner1);     getfilesnames();         } private void getfilesnames() {     string[] filenames=getapplicationcontext().filelist();     list<string> list=new arraylist<string>();     for(int = 0; < filenames.length; i++) {         list.add(filenames[i]);     }     arrayadapter<string> filenameadapter = new arrayadapter<string>(this,android.r.layout.simple_list_item_1,list);     sp1.setadapter(filenameadapter); }