audio recording - how can i change frequency of recorded sound in android -


i developing android application records through mic , changes frequency. similar helium booth app iphone. time being have written code record file , save in sdcard. question can change frequency of sound while recording? or can set frequency in audio should recorded. following code:

 public class mainactivity extends activity {  mediarecorder recorder;   file audiofile = null;   private static final string tag = "soundrecordingactivity";   private view startbutton;   private view stopbutton; @override protected void oncreate(bundle savedinstancestate) {     super.oncreate(savedinstancestate);     setcontentview(r.layout.activity_main);     startbutton = findviewbyid(r.id.start);     stopbutton = findviewbyid(r.id.stop);     startbutton.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             try {                 startrecording(v);             } catch (ioexception e) {                 // todo auto-generated catch block                 e.printstacktrace();             }          }     });     stopbutton.setonclicklistener(new view.onclicklistener() {          @override         public void onclick(view v) {             stoprecording(v);          }     }); }   public void startrecording(view view) throws ioexception {          startbutton.setenabled(false);         stopbutton.setenabled(true);          file sampledir = environment.getexternalstoragedirectory();         try {           audiofile = file.createtempfile("sound", ".3gp", sampledir);         } catch (ioexception e) {           log.e(tag, "sdcard access error");           return;         }         recorder = new mediarecorder();         recorder.setaudiosource(mediarecorder.audiosource.mic);         recorder.setoutputformat(mediarecorder.outputformat.three_gpp);         recorder.setaudioencoder(mediarecorder.audioencoder.amr_nb);         recorder.setoutputfile(audiofile.getabsolutepath());         recorder.prepare();         recorder.start();       }        public void stoprecording(view view) {         startbutton.setenabled(true);         stopbutton.setenabled(false);         recorder.stop();         recorder.release();         addrecordingtomedialibrary();       }        protected void addrecordingtomedialibrary() {         contentvalues values = new contentvalues(4);         long current = system.currenttimemillis();         values.put(mediastore.audio.media.title, "audio" + audiofile.getname());         values.put(mediastore.audio.media.date_added, (int) (current / 1000));         values.put(mediastore.audio.media.mime_type, "audio/3gpp");         values.put(mediastore.audio.media.data, audiofile.getabsolutepath());         contentresolver contentresolver = getcontentresolver();          uri base = mediastore.audio.media.external_content_uri;         uri newuri = contentresolver.insert(base, values);          sendbroadcast(new intent(intent.action_media_scanner_scan_file, newuri));         toast.maketext(this, "added file " + newuri, toast.length_long).show();       }   @override public boolean oncreateoptionsmenu(menu menu) {     // inflate menu; adds items action bar if present.     getmenuinflater().inflate(r.menu.main, menu);     return true; }}


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