Why does Android AudioRecord initialization fail?

Question

I used following Tutorial to make a sound recording app:

When I start it on my test device (LG P970 Optimus Black) I get an error code:

 Error creating AudioRecord instance: initialization check failed.
 Error code -20 when initializing native AudioRecord object.

I found some "solutions" like adding to the Manifest the RECORD_AUDIO permission and use the .release() method. But all this stuff was allready in the source code.

Any other solutions for this problem? Could it be the device?

Answer 1

I have solved this error Like this.becuse we can call AudioRecors object like this.

private AudioRecord findAudioRecord() {
        // TODO Auto-generated method stub
           for (int rate : mSampleRates) {

               for (short audioFormat : new short[] { AudioFormat.ENCODING_PCM_8BIT, AudioFormat.ENCODING_PCM_16BIT }) {

                   for (short channelConfig : new short[] { AudioFormat.CHANNEL_IN_MONO, AudioFormat.CHANNEL_IN_STEREO }) {

                       try {

                           Log.d("AudiopRecording", "Attempting rate " + rate + "Hz, bits: " + audioFormat + ", channel: "

                                   + channelConfig);

                           int bufferSize = AudioRecord.getMinBufferSize(rate, channelConfig, audioFormat);

                           if (bufferSize != AudioRecord.ERROR_BAD_VALUE) {

                               // check if we can instantiate and have a success

                               AudioRecord recorder = new AudioRecord(AudioSource.DEFAULT, rate, channelConfig, audioFormat, bufferSize);

                               if (recorder.getState() == AudioRecord.STATE_INITIALIZED)

                                   return recorder;

                           }

                       } catch (Exception e) {

                           Log.e("AudiopRecording", rate + "Exception, keep trying.",e);

                       }

                   }

               }

           }


        return null;
    }