MediaRecorder Android 11启动失败-1004

问题描述

在Android 11上，我的MediaRecorder无法初始化.我怀疑问题与范围存储有关，但我一直无法找出原因.我正在使用MediaRecorder来录制来自麦克风的音频.我从音频中提取振幅，所以我无意保留文件，这就是为什么路径为/dev/null

On Android 11 my MediaRecorder fails to initialize. I suspect the problem is related to scopedstorage, but I have been unable to figure out the cause. I am using MediaRecorder to record audio from the microphone. I extract the amplitude from the audio, so I have no intention to keep the file, that is why the path is /dev/null

 var mRecorder: MediaRecorder? = null


 if (mRecorder == null) {
        mRecorder = MediaRecorder()
        mRecorder!!.setAudioSource(MediaRecorder.AudioSource.MIC)
        mRecorder!!.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP)
        mRecorder!!.setAudioEncoder(MediaRecorder.AudioEncoder.AMR_NB)
        mRecorder!!.setOutputFile("/dev/null")
        try {
            mRecorder!!.prepare()
        } catch (ioe: IOException) {
            Log.e("[Monkey]", "IOException: " + Log.getStackTraceString(ioe))
        } catch (e: SecurityException) {
            Log.e("[Monkey]", "SecurityException: " + Log.getStackTraceString(e))
        }
        try {
            mRecorder!!.start()
        } catch (e: SecurityException) {
            Log.e("[Monkey]", "SecurityException: " + Log.getStackTraceString(e))
        }

崩溃发生在MediaRecorded.start(). /dev/null在Android 11上不是有效路径吗?

The crash is at MediaRecorded.start(). Is /dev/null not a valid path on Android 11?

Logcat:

start failed: -1004
2020-11-15 10:51:41.827 11836-11836/= E/AndroidRuntime: FATAL EXCEPTION: main
    Process: c=, PID: 11836
    java.lang.RuntimeException: start failed.
        at android.media.MediaRecorder.start(Native Method)

推荐答案

替换"/dev/null"；具有正确的文件路径"$ {externalCacheDir.absolutePath}/test.3gp"；而且应该可以.

Replace "/dev/null" with the correct file path "${externalCacheDir.absolutePath}/test.3gp" and it should work.

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