java – AudioRecord对象未在项目中初始化

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 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

我在清单文件中添加了以下行.

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

我已经测试了AudioRecord object not initializing.这些解决方案都没有.

但它在另一个项目中工作.
有什么遗漏？