Android MediaRecorder 在某些设备上不工作

Question

我在后台服务中运行 Media Recorder，它在 Samsung 6.0 及更高版本的设备上运行完美，但在较低的设备上无法运行。抛出以下异常

stop called in an invalid state: 4

FATAL EXCEPTION: main
Process: com.shoaibnwar.crighter, PID: 28547
java.lang.IllegalStateException
    at android.media.MediaRecorder._stop(Native Method)
    at android.media.MediaRecorder.stop(MediaRecorder.java:946)
    at com.shoaibnwar.crighter.Services.RecordingAudio.stopRecording(RecordingAudio.java:114)
    at com.shoaibnwar.crighter.Services.RecordingAudio.access$000(RecordingAudio.java:24)
    at com.shoaibnwar.crighter.Services.RecordingAudio$1.run(RecordingAudio.java:69)
    at android.os.Handler.handleCallback(Handler.java:739)
    at android.os.Handler.dispatchMessage(Handler.java:95)
    at android.os.Looper.loop(Looper.java:145)
    at android.app.ActivityThread.main(ActivityThread.java:7007)
    at java.lang.reflect.Method.invoke(Native Method)
    at java.lang.reflect.Method.invoke(Method.java:372)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1404)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1199)

这是我开始录制的代码

private void startRecording(File file) {

    if (mediaRecorder != null) {
        mediaRecorder.reset();
        mediaRecorder.release();
    }
    mediaRecorder = new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    //mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.MPEG_2_TS);
   // mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_WB);
    //mediaRecorder.setOutputFile(file.getAbsolutePath());

    mediaRecorder.setOutputFile(file.getAbsolutePath());
    mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

   /* if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN) {
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.HE_AAC);
        mediaRecorder.setAudioEncodingBitRate(48000);
    } else {
        mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AAC);
        mediaRecorder.setAudioEncodingBitRate(64000);
    }
    mediaRecorder.setAudioSamplingRate(16000);*/
    try {
        mediaRecorder.prepare();
        mediaRecorder.start();
    } catch (IOException e) {
        Log.e("giftlist", "io problems while preparing [" +
                file.getAbsolutePath() + "]: " + e.getMessage());
    }
}

停止录音的功能是

private void stopRecording() {
    if (mediaRecorder != null) {
        mediaRecorder.stop();
        mediaRecorder.release();
        mediaRecorder = null;
    }
}

我正在设置如下文件路径

private File getOutputFile() {
    SimpleDateFormat dateFormat = new SimpleDateFormat("yyyyMMdd_HHmmssSSS", Locale.US);

    return new File(Environment.getExternalStorageDirectory().getAbsolutePath().toString()
            +File.separator
            +Environment.DIRECTORY_MUSIC
            +File.separator
            + "/CRighterVoice/RECORDING_"
            + dateFormat.format(new Date())
            + ".m4a");


}

Answer 1

试着打电话

mediaRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB);

之前

mediaRecorder.setOutputFile(file.getAbsolutePath());