I am unable to record audio for one minute using android

package com.javacodegeeks.android.audiocapturetest;

import java.io.IOException;
import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.app.Activity;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;

public class MainActivity extends Activity {

   private MediaRecorder myRecorder;
   private MediaPlayer myPlayer;
   private String outputFile = null;
   private Button startBtn;
   private Button stopBtn;
   private Button playBtn;
   private Button stopPlayBtn;
   private TextView text;
   
   @Override
   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
      
      text = (TextView) findViewById(R.id.text1);
      // store it to sd card
      outputFile = Environment.getExternalStorageDirectory().
    		  getAbsolutePath() + "/javacodegeeksRecording.3gpp";

      myRecorder = new MediaRecorder();
      myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
      myRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
      myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
      myRecorder.setOutputFile(outputFile);
      
      startBtn = (Button)findViewById(R.id.start);
      startBtn.setOnClickListener(new OnClickListener() {
		
		@Override
		public void onClick(View v) {
			// TODO Auto-generated method stub
			start(v);
		}
      });
      
      stopBtn = (Button)findViewById(R.id.stop);
      stopBtn.setOnClickListener(new OnClickListener() {
  		
  		@Override
  		public void onClick(View v) {
  			// TODO Auto-generated method stub
  			stop(v);
  		}
      });
      
      playBtn = (Button)findViewById(R.id.play);
      playBtn.setOnClickListener(new OnClickListener() {
  		
  		@Override
  		public void onClick(View v) {
  			// TODO Auto-generated method stub
				play(v);	
  		}
      });
      
      stopPlayBtn = (Button)findViewById(R.id.stopPlay);
      stopPlayBtn.setOnClickListener(new OnClickListener() {
  		
  		@Override
  		public void onClick(View v) {
  			// TODO Auto-generated method stub
  			stopPlay(v);
  		}
      });
   }

   public void start(View view){
	   try {
          myRecorder.prepare();
          myRecorder.start();
       } catch (IllegalStateException e) {
          // start:it is called before prepare()
    	  // prepare: it is called after start() or before setOutputFormat() 
          e.printStackTrace();
       } catch (IOException e) {
           // prepare() fails
           e.printStackTrace();
        }
	   
       text.setText("Recording Point: Recording");
       startBtn.setEnabled(false);
       stopBtn.setEnabled(true);
       
       Toast.makeText(getApplicationContext(), "Start recording...", 
    		   Toast.LENGTH_SHORT).show();
   }

   public void stop(View view){
	   try {
	      myRecorder.stop();
	      myRecorder.release();
	      myRecorder  = null;
	      
	      stopBtn.setEnabled(false);
	      playBtn.setEnabled(true);
	      text.setText("Recording Point: Stop recording");
	      
	      Toast.makeText(getApplicationContext(), "Stop recording...",
	    		  Toast.LENGTH_SHORT).show();
	   } catch (IllegalStateException e) {
			//  it is called before start()
			e.printStackTrace();
	   } catch (RuntimeException e) {
			// no valid audio/video data has been received
			e.printStackTrace();
	   }
   }
  
   public void play(View view) {
	   try{
		   myPlayer = new MediaPlayer();
		   myPlayer.setDataSource(outputFile);
		   myPlayer.prepare();
		   myPlayer.start();
		   
		   playBtn.setEnabled(false);
		   stopPlayBtn.setEnabled(true);
		   text.setText("Recording Point: Playing");
		   
		   Toast.makeText(getApplicationContext(), "Start play the recording...", 
				   Toast.LENGTH_SHORT).show();
	   } catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
   }
   
   public void stopPlay(View view) {
	   try {
	       if (myPlayer != null) {
	    	   myPlayer.stop();
	           myPlayer.release();
	           myPlayer = null;
	           playBtn.setEnabled(true);
	           stopPlayBtn.setEnabled(false);
	           text.setText("Recording Point: Stop playing");
	           
	           Toast.makeText(getApplicationContext(), "Stop playing the recording...", 
					   Toast.LENGTH_SHORT).show();
	       }
	   } catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
   }
}