import android.app.Activity;    import android.media.MediaRecorder;    import android.os.Bundle;    import android.os.Environment;    import android.view.View;    import android.view.View.OnClickListener;    import android.widget.Button;        public class MainActivity extends Activity {            private Button start, end;        private MediaRecorder mediaRecorder;        private String fileName;        @Override        protected void onCreate(Bundle savedInstanceState) {            super.onCreate(savedInstanceState);            setContentView(R.layout.main);            start= (Button) findViewById(R.id.start);            end = (Button) findViewById(R.id.end);            fileName= Environment.getExternalStorageDirectory().getAbsolutePath() + "/audioRecorder.3gp";            start.setOnClickListener(new OnClickListener() {                                @Override                public void onClick(View v) {                    //一共七步                    mediaRecorder = new MediaRecorder();                    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);//设置麦克风                    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);//输出音频格式                    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//编码格式                    mediaRecorder.setOutputFile(fileName);//输出路径                    try {                        mediaRecorder.prepare();//准备                    } catch (Exception e) {                        e.printStackTrace();                    }                    mediaRecorder.start();//开始录音                }            });            //结束录音            end.setOnClickListener(new OnClickListener() {                                @Override                public void onClick(View v) {                    mediaRecorder.stop();                    mediaRecorder.release();                }            });        }    }