AudioRecord对象未在项目中初始化

问题描述

当我尝试使用以下代码通过我的Nexus 5录制音频时

  record = new AudioRecord（MediaRecorder.AudioSource .MIC，sampleRate，AudioFormat.CHANNEL_IN_MONO，AudioFormat.ENCODING_PCM_8BIT，BYTE_OF_SAMPLE * bufferSampleSize）; 
 record.startRecording（）; 
  

然后我在logcat中得到以下异常：

  E / AudioRecord：AudioFlinger无法创建记录轨道，状态：-1 
 E / AudioRecord-JNI：创建AudioRecord实例时出错：初始化检查失败，状态为-1。 
 E / android.media.AudioRecord：初始化本机AudioRecord对象时的错误代码-20。 
 E / AndroidRuntime：FATAL EXCEPTION：Thread-855 
 E / AndroidRuntime：Process：com。*。*，PID：14206 
 E / AndroidRuntime：java.lang.IllegalStateException：startRecording（）呼吁未初始化的AudioRecord。 
 E / AndroidRuntime：在android.media.AudioRecord.startRecording（AudioRecord.java:885）
 E / AndroidRuntime：at com。*。*。MainActivity $ Looper.run（MainActivity.java:265） 
 E / Surface：getSlotFromBufferLocked：未知缓冲区：0x9e476d00 
  

我添加了以下行清单文件。

 < uses-permission android：name =android.permission.RECORD_AUDIO/> 
  

我已经测试了

When I am trying to record an audio through my Nexus 5 using following code

record = new AudioRecord(MediaRecorder.AudioSource.MIC, sampleRate, AudioFormat.CHANNEL_IN_MONO, AudioFormat.ENCODING_PCM_8BIT, BYTE_OF_SAMPLE * bufferSampleSize);
record.startRecording();

Then I am getting following exceptions in logcat:

E/AudioRecord: AudioFlinger could not create record track, status: -1
E/AudioRecord-JNI: Error creating AudioRecord instance: initialization check failed with status -1.
E/android.media.AudioRecord: Error code -20 when initializing native AudioRecord object.
E/AndroidRuntime: FATAL EXCEPTION: Thread-855
E/AndroidRuntime: Process: com.*.*, PID: 14206
E/AndroidRuntime: java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
E/AndroidRuntime:     at android.media.AudioRecord.startRecording(AudioRecord.java:885)
E/AndroidRuntime:     at com.*.*.MainActivity$Looper.run(MainActivity.java:265)
E/Surface: getSlotFromBufferLocked: unknown buffer: 0x9e476d00

I've added following line in manifest file.

<uses-permission android:name="android.permission.RECORD_AUDIO" />

I've tested AudioRecord object not initializing. None of those solutions working.

But its working in another project.Is there anything missing?

解决方案

Got the solution:Recently I updated my phone to Marshmallow. In Marshmallow there is a new permission system. I switched on these permissions as bellow the recording works just fine.

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