AudioRecord doesn't work for Motorola Milestone

Question

I'm having this problem only on Motorola Milestone. Code:

// init recorder
recordInstance = new AudioRecord(MediaRecorder.AudioSource.MIC,
    8000, AudioFormat.CHANNEL_CONFIGURATION_MONO,
    AudioFormat.ENCODING_PCM_16BIT, 8000);

recordInstance.startRecording();

//more code here

recordInstance.stop();

The errorinformation I have (can't find more for the moment since I don't have a milestone myself for debugging):

Uncaught handler: thread main exiting due to uncaught exception
java.lang.IllegalStateException: stop() called on an uninitialized AudioRecord.
at android.media.AudioRecord.stop(AudioRecord.java:51 6)

Apparantly I'm not the only one with this problem. Some very similar threads I found (without solution):

http://groups.google.com/group/android-developers/browse_thread/thread/6dd24aeb484b2e40 http://androidcommunity.com/forums/f2/problem-using-audiorecord-in-motorola-milestone-30935/ http://community.developer.motorola.com/t5/Android-App-Development-for/Problem-using-AudioRecord-on-Milestone-device/m-p/3889 http://www.fring.com/forums/showthread.php?t=16194 http://groups.google.com/group/android-developers/browse_thread/thread/63be273ba59c635e/1c4a010fd470d328

Answer 1

Firstly as it says try putting a try catch block over the stop, as the debugs message is saying, the recording is getting into an IllegalState.

Probably if u can catch the exception, you can find out what the problem is.

Answer 2

Hi I am facing issue with following parameter

audioRecord =new AudioRecord(MediaRecorder.AudioSource.MIC, 11025, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_8BIT, 5000);

getting exception

android startRecording called on an uninitialized AudioRecord

Answer 3

I have the same exact problem. Perhaps the AudioRecord object is uninitialized because the parameters are not compatible with the device. I don't have a milestone to test with, but on my Nexus One, Cliq XT, Behold II and the Emulator, the following parameters work:

audioRecord =new AudioRecord(MediaRecorder.AudioSource.MIC, 8000, AudioFormat.CHANNEL_CONFIGURATION_MONO, AudioFormat.ENCODING_PCM_16BIT,  
AudioRecord.getMinBufferSize(8000,AudioFormat.CHANNEL_CONFIGURATION_MONO,AudioFormat.ENCODING_PCM_16BIT) );

autoRecord.startRecording(); // will throw an exception, based upon phone type

The above works fine on: Nexus One, Samsung Behold II, Cliq XT and the emulator. I've heard that it does not work on the: LG Ally (and possibly Moto Milestone/Droid). Perhaps someone can test it out on those devices and tell us what parameters do work.

Answer 4

I have tested with exactly above parameters on my Droid, apparenty it still crashes although the case is not always. (most of the time it works, but sometimes I still could find the problem)