android - android录音音量变化

Question

现在，我正在开发一个Android应用程序来录制语音。我通过使用以下代码来做到这一点。

m_recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    m_recorder.setOutputFormat(OutputFormat.THREE_GPP);

    m_recorder.setAudioEncoder(AudioEncoder.AMR_NB);
 // m_recorder.setAudioEncoder(MediaRecorder.getAudioSourceMax());
    m_recorder.setAudioEncodingBitRate(128);
    m_recorder.setAudioSamplingRate(44100);

    m_recorder.setOutputFile(Environment.getExternalStorageDirectory() + "/audio.3gp");
        try {
            m_recorder.prepare();
            m_recorder.start();
        } 

但是问题是我的声音太小了，我在网上搜索了解决方法，我得到的只是

"There is no way to do this while recording - but while playing, you can use the setVolume(float, float) method on MediaPlayer."

但是我必须将录制的片段上传到服务器上，那么有什么办法可以将低音量的声音片段转换为高音量的片段？

Answer 1

我使用以下代码记录和保存文件，它对我有用:

                    recorder = new MediaRecorder();
                    FileOutputStream fos = openFileOutput(fileNameStr,
                            MODE_PRIVATE);

                    recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
                    recorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
                    recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);
                    recorder.setOutputFile(fos.getFD());
                    recorder.prepare();
                    recorder.start();