Android手机通话录音实现

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最近在做语音IVR的时候需要对通话进行录音，主要用到了MediaRecorder类，实现代码如下：

MediaRecorder mRecorder = new MediaRecorder();        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath(),"ivr_record");        if(!dir.exists()){        dir.mkdirs();        }                mFileName = new File(dir,"ivr_"+System.currentTimeMillis()+".3gp").getAbsolutePath();                Log.i(TAG, "start recording:"+mFileName);                mRecorder.setOutputFile(mFileName);        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        try {            mRecorder.prepare();        } catch (IOException e) {            Log.e(TAG, "prepare() failed");        }        mRecorder.start();

这种方式只能录自己的语音，对方的语音录不到，如果想录对方的语音，只需要将audio source设置成 MediaRecorder.AudioSource.VOICE_CALL就可以了，代码如下：

MediaRecorder mRecorder = new MediaRecorder();        mRecorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL);        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);                File dir = new File(Environment.getExternalStorageDirectory().getAbsolutePath(),"ivr_record");        if(!dir.exists()){        dir.mkdirs();        }                mFileName = new File(dir,"ivr_"+System.currentTimeMillis()+".3gp").getAbsolutePath();                Log.i(TAG, "start recording:"+mFileName);                mRecorder.setOutputFile(mFileName);        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);        try {            mRecorder.prepare();        } catch (IOException e) {            Log.e(TAG, "prepare() failed");        }        mRecorder.start();

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