为什么即使我使用WakeLock，当设备进入睡眠状态时，AudioRecord也无法录制声音? [英] Why AudioRecord is not recording sound when device fall asleep even when I use WakeLock?

问题描述

我正在使用 AudioRecord 录制设备中的声音，并将其写入 .wav 文件，即使设备移动，我也需要它来继续录制和写入文件睡觉.因此，我将wakeLock与 PARTIAL_WAKE_LOCK 参数一起使用.但是在设备进入睡眠状态后， AudioRecord 会继续录音，但是没有声音.当我打开 .wav 文件时，设备进入睡眠状态后便会保持静音状态.

  audioRecord.startRecording();isReading = true;totalSizeInBytes = 0;新线程(新Runnable(){@Override公共无效run(){short [] buffer =新的short [bufferSize];//短裤的缓冲区，从audioRecord获取int readCount;int状态int校验= 0;//wakeLock初始化和获取PowerManager pm =(PowerManager)getSystemService(Context.POWER_SERVICE);akeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK，"MyApp:RecordWakeLock");akeLock.acquire();如果(isWavFileCreated){while(isReading){Log.d(TAG，audioRecord.getRecordingState()+");readCount = audioRecord.read(buffer，0，bufferSize);writeWavFile(buffer);}writeWavFileHeader();尝试 {dos.close();} catch(IOException e){e.printStackTrace();}}}}).开始(); 

audioRecord.getRecordState()始终返回true.我不知道是什么问题.

解决方案

@Raskilas的答案！

但是，它没有包含很多实际代码，因此我整理了一个Github Gist来演示该方法: https://gist.github.com/Venryx/e1f772b4c05b2da08e118ccd5cc162ff

这不是一个完全完成的项目(并且没有多余的东西)，但是它包含了所有重要的内容，我可以确认它可以在我的设备(Mi Mix 3，Android 9)上正常工作，即使屏幕关闭.(我按下电源键并等待30分钟以上，但仍在记录麦克风输入.我之前的尝试都停止了约2分钟.)

有趣的是，我什至不需要激活唤醒锁或wifi锁.但是，如果您发现设备需要它，并且/或者为了防止其他功能被挂起，则Gist中也包含了这样做的功能.

I'm recording the sound from device with AudioRecord and write it to .wav file and I need it to keep recording and writing in file even when the device goes to sleep. So I used wakeLock with PARTIAL_WAKE_LOCK argument. But after the device went asleep AudioRecord keep recording but there is no sound. When I opened a .wav file there is a silent from the moment when device went asleep.

audioRecord.startRecording();
isReading = true;
totalSizeInBytes = 0;        
new Thread(new Runnable() {
        @Override
        public void run() {
            short[] buffer = new short[bufferSize]; //buffer of shorts, getting from audioRecord
            int readCount;
            int state;
            int check = 0;
                        //wakeLock initialization and acquiring
            PowerManager pm = (PowerManager)getSystemService(Context.POWER_SERVICE);
            wakeLock = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyApp:RecordWakeLock");
            wakeLock.acquire();
            if (isWavFileCreated) {
                while (isReading) {
                    Log.d(TAG, audioRecord.getRecordingState() + "");
                    readCount = audioRecord.read(buffer, 0, bufferSize);
                    writeWavFile(buffer);
                }
                writeWavFileHeader();
                try {
                    dos.close();
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }).start();

audioRecord.getRecordState() always return true. I don't know what'fs the problem.

解决方案

The answer by @Raskilas works!

However, it doesn't include much of the actual code needed, so I've put together a Github Gist which demonstrates the approach: https://gist.github.com/Venryx/e1f772b4c05b2da08e118ccd5cc162ff

It's not a completely finished project (and has extra stuff that isn't needed), but it includes all the important bits, and I can confirm it's working on my device (Mi Mix 3, Android 9), even when its screen is turned off. (I press power and wait 30+ minutes, and it's still logging the microphone input. My previous attempts all stopped ~2 minutes in.)

Interestingly, I didn't even need to activate a wake-lock or wifi-lock; however, functions to do so are included in the Gist as well, in case you find it's needed for your device, and/or to prevent other functionality from being suspended.

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