java.lang.IllegalStateException at android.media.MediaRecorder._stop(Native Method)

Mobile
#1

Galera estou com erro na hora de pausar o som gravado em meu aplicativo, segue o código abaixo:

import android.media.MediaPlayer;
import android.media.MediaRecorder;
import android.os.Bundle;
import android.os.Environment;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import java.io.IOException;
import java.util.Date;

public class MainActivity extends AppCompatActivity {
Button play, stop, record;
MediaRecorder myAudioRecorder;
String outputFile;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);

    play = (Button) findViewById(R.id.play);
    stop = (Button) findViewById(R.id.stop);
    record = (Button) findViewById(R.id.record);
    stop.setEnabled(false);
    play.setEnabled(false);
    Date createdTime = new Date();
    outputFile = Environment.getExternalStorageDirectory().getAbsolutePath() + "/" + createdTime + "_rec.3gp";
    myAudioRecorder = new MediaRecorder();
    myAudioRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    myAudioRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    myAudioRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
    myAudioRecorder.setOutputFile(outputFile);

    record.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            try {
                myAudioRecorder.prepare();
                myAudioRecorder.start();
            } catch (IllegalStateException ise) {
                // make something ...
            } catch (IOException ioe) {
                // make something
            }
            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) {
            myAudioRecorder.stop();
            myAudioRecorder.release();
            myAudioRecorder = null;
            record.setEnabled(true);
            stop.setEnabled(false);
            play.setEnabled(true);
            Toast.makeText(getApplicationContext(), "Audio Recorder successfully", Toast.LENGTH_LONG).show();
        }
    });

    play.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            MediaPlayer mediaPlayer = new MediaPlayer();
            try {
                mediaPlayer.setDataSource(outputFile);
                mediaPlayer.prepare();
                mediaPlayer.start();
                Toast.makeText(getApplicationContext(), "Playing Audio", Toast.LENGTH_LONG).show();
            } catch (Exception e) {
                // make something
            }
        }
    });
}

}