How to capture audio in android

MainActivity.java

public class MainActivity extends Activity {
   Button play,stop,record;
   private MediaRecorder audioRecorder;
   private String outputFile = null;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      
      play=(Button)findViewById(R.id.button3);
      stop=(Button)findViewById(R.id.button2);
      record=(Button)findViewById(R.id.button);
      
      stop.setEnabled(false);
      play.setEnabled(false);
      outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/audiosample.3gp";;
      
      audioRecorder=new MediaRecorder();
      audioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
      audioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
      audioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
      audioRecorder.setOutputFile(outputFile);
      
      record.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            try {
               audioRecorder.prepare();
               audioRecorder.start();
            }
            
            catch (IllegalStateException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }
            
            catch (IOException e) {
               // TODO Auto-generated catch block
               e.printStackTrace();
            }
            
            record.setEnabled(false);
            stop.setEnabled(true);
            
            Toast.makeText(getApplicationContext(), "Recording started", Toast.LENGTH_LONG).show();
         }
      });
      
      stop.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) {
            audioRecorder.stop();
            audioRecorder.release();
            audioRecorder  = null;
            
            stop.setEnabled(false);
            play.setEnabled(true);
            
            Toast.makeText(getApplicationContext(), "Successfully audio recorded",Toast.LENTH_LONG).show();
         }
      });
      
      play.setOnClickListener(new View.OnClickListener() {
         @Override
         public void onClick(View v) throws IllegalArgumentException,SecurityException,IllegalStateException {
            MediaPlayer m = new MediaPlayer();
            
            try {
               m.setDataSource(outputFile);
            }
            
            catch (IOException e) {
               e.printStackTrace();
            }
            
            try {
               m.prepare();
            }
            
            catch (IOException e) {
               e.printStackTrace();
            }
            
            m.start();
            Toast.makeText(getApplicationContext(), "Playing audio", Toast.LENGTH_LONG).show();
         }
      });
   }
   
   @Override
   public boolean onCreateOptionsMenu(Menu menu) {
      getMenuInflater().inflate(R.menu.menu_main, menu);
      return true;
   }
   
   @Override
   public boolean onOptionsItemSelected(MenuItem item) {
      
      int id = item.getItemId();
      
      if (id == R.id.action_settings) {
         return true;
      }
      return super.onOptionsItemSelected(item);
   }
}