public class PhoneService extends Service {        private MediaRecorder recorder;    @Override    public IBinder onBind(Intent intent) {                return null;    }        //服务第一次被开启的时候调用    @Override    public void onCreate() {                //[1]获取电话管理者的实例          TelephonyManager tm  = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);                //[2]注册一个电话状态的监听        tm.listen(new MyPhoneStateListenrer(), PhoneStateListener.LISTEN_CALL_STATE);                        super.onCreate();    }            //监听电话的状态    private class MyPhoneStateListenrer extends PhoneStateListener{        //当设备的状态发生改变的时候调用                @Override        public void onCallStateChanged(int state, String incomingNumber) {                        //[3]具体判断一下  电话是处于什么状态            switch (state) {            case TelephonyManager.CALL_STATE_IDLE:  //空闲状态                if (recorder!=null) {                     recorder.stop();  //停止录                     recorder.reset();   // You can reuse the object by going back to setAudioSource() step                     recorder.release(); // Now the object cannot be reused                                    }                                                break;                            case TelephonyManager.CALL_STATE_OFFHOOK://接听状态                                 System.out.println("开始录");                //开启录                 recorder.start();   // Recording is now started                                break;                            case TelephonyManager.CALL_STATE_RINGING:  //响铃状态                System.out.println("我准备一个录音机出来 ");                //[1]获取MediaRecorder类的实例                recorder = new MediaRecorder();                //[2]设置音频的来源                 recorder.setAudioSource(MediaRecorder.AudioSource.MIC); //zet                  //[3]设置音频的输出格式                  recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                 //[4]设置音频的编码方式                  recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                 //[5]保存的文件路径                 recorder.setOutputFile("/mnt/sdcard/luyin.3gp");                 //[5]准备录音                 try {                    recorder.prepare();                } catch (IllegalStateException e) {                    e.printStackTrace();                } catch (IOException e) {                    e.printStackTrace();                }                                break;            }                                                super.onCallStateChanged(state, incomingNumber);        }            }            //当服务销毁的时候执行     @Override    public void onDestroy() {        super.onDestroy();    }}

　　<uses-permission android:name="android.permission.READ_PHONE_STATE"/>    <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />    <uses-permission android:name="android.permission.RECORD_AUDIO" />    <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED"/>