MediaRecorder.AudioSource.VOICE_CALL无效

Question

我打算创建一个录制语音通话的程序，但MediaRecorder.AudioSource.VOICE_COMMUNICATION不起作用。我认为它不支持许多手机。

我正在尝试使用recorder = new MediaRecorder(); recorder.reset(); recorder.setAudioSource(MediaRecorder.AudioSource.VOICE_CALL); recorder.setOutputFormat(MediaRecorder.OutputFormat.AMR_NB); recorder.setOutputFile(mFileName); recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB); try { recorder.prepare(); } catch (IOException e) { Log.e("LOG", "prepare() failed"); } recorder.start(); ，但它只是记录和上传语音。换句话说，我用麦克风录制声音!!!

我正在尝试使用Calendar，但声音很糟糕。

以下是我的示例代码：

long curDayDate = 1524787200;  // April, 27th, 2018

Instant instant = Instant.ofEpochMilli(curDayDate*1000);
LocalDateTime ldt = instant.atZone(ZoneId.of("GMT")).toLocalDateTime();

int gYear   = ldt.getYear();
int gMonth  = ldt.getMonthValue();
int gDay    = ldt.getDayOfMonth();

Calendar Cal = Calendar.getInstance();
Cal.set(gYear, gMonth, gDay);

for(int i = 0; i < 7; i++) {

    // Next day
    Cal.add(Calendar.DATE, 1);
    System.out.println("Next Year = " + Cal.get(Calendar.YEAR) + ", Next Month = " + Cal.get(Calendar.MONTH) + ", Next Date = " + Cal.get(Calendar.DATE));
}

请帮帮我。谢谢。