来电监听及录音

1. 来电状态监听

    public class MyService extends Service {
   
        private MediaRecorder mRecorder;
        private String num;
   
        @Override
        public void onCreate() {
            super.onCreate();
            TelephonyManager manager = (TelephonyManager) getSystemService(TELEPHONY_SERVICE);    // 获取电话管理器
            manager.listen(new MyPhoneStateListener(), PhoneStateListener.LISTEN_CALL_STATE);    // 监听电话状态
        }
   
        private class MyPhoneStateListener extends PhoneStateListener {            // 电话状态监听器
            public void onCallStateChanged(int state, String incomingNumber) {    // 在电话状态改变时执行
                switch (state) {
                    case TelephonyManager.CALL_STATE_RINGING:    // 振铃
                        System.out.println("来电话了");
                        num = incomingNumber;//得到来电号码
                        break;        
                    case TelephonyManager.CALL_STATE_OFFHOOK:    // 摘机
                        System.out.println("开始通话");
                        start();
                        break;    
                    case TelephonyManager.CALL_STATE_IDLE:        // 空闲
                        System.out.println("挂断电话");
                        stop();
                        break;
                }
            }
        }
   
        public void onDestroy() {
            tm.listen(listener, PhoneStateListener.LISTEN_NONE);// 取消监听
            listener = null;
        }
   

2. 录音

    private void start() {
        mRecorder = new MediaRecorder();                            // 创建媒体记录器
        mRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);       // 指定音频源(麦克风)
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);      // 设置输出格式(3gp)
        mRecorder.setOutputFile("/mnt/sdcard/" + num + "-" + System.currentTimeMillis() + ".3gp");    // 指定文件路径(SD卡)
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);       // 指定编码(AMR_NB)
        try {
            mRecorder.prepare();    // 准备
        } catch (Exception e) {
            e.printStackTrace();
        }    
        mRecorder.start();   // 开始
    }
   
    @Override
    public IBinder onBind(Intent intent) {
        return null;
    }
   
    //下面是录音
    private void stop() {
        if (mRecorder != null) {
            mRecorder.stop();        // 停止
            mRecorder.release();    // 释放
            mRecorder = null;        // 垃圾回收
        }
    }
   

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