Question

我的应用程序启动thread A以保存一些数据。在这个线程中，我调用函数startRecording(audioFile.getAbsolutePath());

但是我收到以下错误：

start called in an invalid state: 16; at android.media.MediaRecorder.start(Native Method)

每次都不会发生此错误，但有时我会从我的应用程序中收到此错误报告。

下面是我的代码。

public void startRecording(String outputPath) {
    if (recorder == null) {
        recorder = new MediaRecorder();
        recorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        recorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        recorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        recorder.setAudioSamplingRate(RECORDER_SAMPLERATE_22050);
        recorder.setOutputFile(outputPath);
        try {
            recorder.prepare();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    recorder.start();
    SampleRecordThread thread = new SampleRecordThread(outputPath);
    thread.start();

}

private class SampleRecordThread extends Thread {
    private volatile boolean running = true;

    public void exit() {
        running = false;
    }

    @Override
public void run() {
    while (running) {
        try {
            Thread.sleep(10 * 1000);//to record 10 seconds sound
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        recorder.stop();
        recorder.reset();
        recorder.release();
        recorder = null;

        // upload the data to cloud
        if (isWifiActive && isInstallationSaved) {
                    .....
                    record.saveInBackground();
            }

        break;
    }
}

Answer 1

我认为您在前一个录音机未停止和释放时尝试录音你可以使用我的班级

public class AudioRecordManager {

public interface OnAudioRecordCallback {

    void onComplete(String path);

    void onFailed(int code);

}

private OnAudioRecordCallback onAudioRecordCallback;

public void setOnAudioRecordCallback(OnAudioRecordCallback onAudioRecordCallback) {
    this.onAudioRecordCallback = onAudioRecordCallback;
}

private MediaRecorder myRecorder;
private String outputFile;
private AudioRecordThread audioRecordThread;

public AudioRecordManager() {
    audioRecordThread = new AudioRecordThread();
}

private AudioRecordThread audioRecordThread;

public void startRecord() {
    if(audioRecordThread == null || !audioRecordThread.isRunning()){
        new Thread(audioRecordThread).start();
    }
}

public void stopRecord() {
    if(audioRecordThread!=null && audioRecordThread.isRunning()) {
        audioRecordThread.stopRecording();
    }
}

class AudioRecordThread implements Runnable {

    private boolean isRunning;

    private boolean isStop;

    private long startTime;

    private void startRecord() {
        isRunning = true;
        isStop = false;
        File folder = new File(Content.AUDIO_DIR);
        if (!folder.exists()) {
            boolean b = folder.mkdirs();
        }
        startTime = System.currentTimeMillis();
        outputFile = folder.getPath() + "/rec_" + startTime + ".mp3";

        myRecorder = new MediaRecorder();
        myRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        myRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_4);
        myRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
        myRecorder.setOutputFile(outputFile);
        try {
            myRecorder.prepare();
            myRecorder.start();

            startTime = System.currentTimeMillis();

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    private void stopRecord() {

        final long stopTime = System.currentTimeMillis();

        try {
            if(System.currentTimeMillis() - startTime < 500){
                try{
                    Thread.sleep(500);
                }catch (Exception e){
                    e.printStackTrace();
                }
            }
            myRecorder.stop();

            myRecorder.release();
            myRecorder = null;
        } catch (Exception e) {
            myRecorder = null;
            e.printStackTrace();
        }

        if (stopTime - startTime > 1000) {
            if (onAudioRecordCallback != null) {
                onAudioRecordCallback.onComplete(outputFile);
            }
        } else {
            File current = new File(outputFile);
            current.delete();
            if (onAudioRecordCallback != null) {
                onAudioRecordCallback.onFailed(2);
            }
        }

        isRunning = false;
    }

    @Override
    public void run() {
        startRecord();
        while (!isStop) {
            try {
                Thread.sleep(30);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
        stopRecord();
    }

    public void stopRecording() {
        isStop = true;
    }

    public boolean isRunning() {
        return isRunning;
    }
  }
}

在Android上录制音频时出错

1 个答案: