Android read SD card file

 Public classSdcardtest extends activity{final String file_name="/crazyit.bin"; @Override Public voidonCreate (Bundle savedinstancestate) {super.oncreate (savedinstancestate);        Setcontentview (R.layout.main); //get two buttonsButton Read =(Button) Findviewbyid (R.id.read); Button Write=(Button) Findviewbyid (r.id.write); //get two text boxesFinal EditText edit1 =(EditText) Findviewbyid (R.ID.EDIT1); Final EditText Edit2=(EditText) Findviewbyid (R.ID.EDIT2); //to bind an event listener to the Write buttonWrite.setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View source) {//writing content from Edit1 to a fileWrite (Edit1.gettext (). toString ()); Edit1.settext ("");        }        }); Read.setonclicklistener (NewOnclicklistener () {@Override Public voidOnClick (View v) {//reads the contents of the specified file and displays itEdit2.settext (read ());    }        }); }    PrivateString Read () {Try        {            //if the phone is plugged into an SD card and the app has access to SD            if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) { //get the storage directory for the SD cardFile Sdcarddir =environment.getexternalstoragedirectory (); //gets the input stream corresponding to the specified fileFileInputStream FIS =NewFileInputStream (Sdcarddir.getcanonicalpath ()+file_name); //wraps the specified input stream into BufferedReaderBufferedReader br =NewBufferedReader (NewInputStreamReader (FIS)); StringBuilder SB=NewStringBuilder (""); String Line=NULL; //looping through the contents of a file                 while(line = Br.readline ())! =NULL) {sb.append (line); }                //Close ResourceBr.close (); returnsb.tostring (); }        }        Catch(Exception e) {e.printstacktrace (); }        return NULL; }    Private voidWrite (String content) {Try        {            //if the phone is plugged into an SD card and the app has access to SD            if(Environment.getexternalstoragestate (). Equals (environment.media_mounted)) { //get the SD card directoryFile Sdcarddir =environment.getexternalstoragedirectory (); File TargetFile=NewFile (Sdcarddir. Getcanonicalpath ()+file_name); //Create a Randomaccessfile object with the specified fileRandomaccessfile RAF =Newrandomaccessfile (TargetFile,"RW"); //move the file record pointer to the lastRaf.seek (Targetfile.length ()); //Output File ContentsRaf.write (Content.getbytes ()); //Close RandomaccessfileRaf.close (); }        }        Catch(Exception e) {e.printstacktrace (); }    }}

Android read SD card file