package com.itheima.recorder;import android.os.Bundle;import android.app.Activity;import android.content.Intent;import android.view.Menu;import android.view.View;public class MainActivity extends Activity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    public void click(View v){        Intent intent = new Intent(this, RecorderService.class);        startService(intent);    }}

package com.itheima.recorder;import java.io.IOException;import android.app.Service;import android.content.Intent;import android.media.MediaRecorder;import android.os.IBinder;import android.telephony.PhoneStateListener;import android.telephony.TelephonyManager;public class RecorderService extends Service {    private MediaRecorder recorder;//录音api    @Override    public IBinder onBind(Intent intent) {        return null;    }    @Override    public void onCreate() {        super.onCreate();        //拿到电话管理器        TelephonyManager tm = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);        //监听电话状态        //events:决定PhoneStateListener侦听什么内容        tm.listen(new MyListener(), PhoneStateListener.LISTEN_CALL_STATE);    }        class MyListener extends PhoneStateListener{        //一旦电话状态改变，此方法调用        @Override        public void onCallStateChanged(int state, String incomingNumber) {            super.onCallStateChanged(state, incomingNumber);            switch (state) {            case TelephonyManager.CALL_STATE_IDLE:                System.out.println("空闲");                if(recorder != null){                    recorder.stop();                    recorder.release();//使用硬件录音是用c语言占用资源是不会自动释放的需要手动释放                    recorder = null;                }                break;            case TelephonyManager.CALL_STATE_RINGING:                System.out.println("响铃");                if(recorder == null){                    recorder = new MediaRecorder();                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);//音频来源麦克风                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                    recorder.setOutputFile("sdcard/luyin.3gp");//输出文件路径                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);//设置音频编码                    try {                        recorder.prepare();                    } catch (Exception e) {                        // TODO Auto-generated catch block                        e.printStackTrace();                    }                }                break;            case TelephonyManager.CALL_STATE_OFFHOOK:                System.out.println("摘机");                //开始录音                if(recorder != null){                    recorder.start();                }                break;            }        }    }}

     
         
          
        读取电话状态  
       写sd卡权限  
        
      获取开机启动        
              
                   
                        
                         
                     
                
               
               
                   
                        
         开机广播接收者