首先来点的时候一共有三个状态， 空闲，响铃，摘机（接电话）

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

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

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

权限分别是对电话操作，录音权限，sd卡权限

想要开机启动服务就可以用广播接受者来做。

package com.example.luyin;import android.app.Service;import android.content.Intent;import android.media.MediaRecorder;import android.os.IBinder;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;import android.widget.Toast;public class MyService extends Service {    private MediaRecorder recorder;    public MyService() {    }    @Override    public IBinder onBind(Intent intent) {        // TODO: Return the communication channel to the service.        throw new UnsupportedOperationException("Not yet implemented");    }    @Override    public void onCreate() {        Toast.makeText(MyService.this, "服务启动", 1).show();        // TODO Auto-generated method stub        super.onCreate();        // 获得电话管理器，用来监听电话的状态        TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);        // event设置电话只监听电话状态改变        manager.listen(new Listen(), PhoneStateListener.LISTEN_CALL_STATE);    }    private class Listen extends PhoneStateListener {        // 电话状态一旦改变调用        // 通过state的返回值来确定有没有来电话        @Override        public void onCallStateChanged(int state, String incomingNumber) {            // TODO Auto-generated method stub            super.onCallStateChanged(state, incomingNumber);            switch (state) {            // 空闲            case TelephonyManager.CALL_STATE_IDLE:                Toast.makeText(MyService.this, "空闲", 1).show();                if(recorder!=null){                    //录音结束并且释放资源                    recorder.stop();                    recorder.release();                    recorder=null;                }                break;            // 响铃            case TelephonyManager.CALL_STATE_RINGING:                Toast.makeText(MyService.this, "响铃", 1).show();                if (recorder == null) {                    // 录音机                    recorder = new MediaRecorder();                    // 设置录音的来源是麦克风                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);                    // 设置录音的保存格式                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                    // 设置保存路径                    recorder.setOutputFile("sdcard/voice.3gp");                    // 设置编码                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);                    // 准备录音                    try {                        recorder.prepare();                    } catch (Exception e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }                break;            // 接听            case TelephonyManager.CALL_STATE_OFFHOOK:                Toast.makeText(MyService.this, "摘机", 1).show();                if(recorder!=null){                    //开始录音                    recorder.start();                }                break;            }        }    }}