Audiorecord Object Not Initializing

AudioRecord object not initializing

The trick with using AudioRecord is that each device may have different initialization settings, so you will have to create a method that loops over all possible combinations of bit rates, encoding, etc.

private static int[] mSampleRates = new int[] { 8000, 11025, 22050, 44100 };
public AudioRecord findAudioRecord() {
    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(C.TAG, "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(C.TAG, rate + "Exception, keep trying.",e);
                }
            }
        }
    }
    return null;
}

AudioRecord recorder = findAudioRecord();
recorder.release();

Android AudioRecord won't initialize

I found the answer myself. It had to do with permissions.

The problem was that I am running API version 23 (Android 6.0.1) on my phone, which no longer uses only the manifest file to handle permissions. From version 23, permissions are granted in run-time instead. I added a method that makes sure to request the permission in run-time, and when I had allowed it once on my phone, it worked.

private void requestRecordAudioPermission() {
    //check API version, do nothing if API version < 23!
    int currentapiVersion = android.os.Build.VERSION.SDK_INT;
    if (currentapiVersion > android.os.Build.VERSION_CODES.LOLLIPOP){

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.RECORD_AUDIO) != PackageManager.PERMISSION_GRANTED) {

            // Should we show an explanation?
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.RECORD_AUDIO)) {

                // Show an expanation to the user *asynchronously* -- don't block
                // this thread waiting for the user's response! After the user
                // sees the explanation, try again to request the permission.

            } else {

                // No explanation needed, we can request the permission.

                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.RECORD_AUDIO}, 1);
            }
        }
    }
}

@Override
public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
    switch (requestCode) {
        case 1: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {

                // permission was granted, yay! Do the
                // contacts-related task you need to do.
                Log.d("Activity", "Granted!");

            } else {

                // permission denied, boo! Disable the
                // functionality that depends on this permission.
                Log.d("Activity", "Denied!");
                finish();
            }
            return;
        }

        // other 'case' lines to check for other
        // permissions this app might request
    }
}

I then call requestRecordAudioPermission() from the onCreate() method in my main activity before creating the AudioRecord.

AudioRecord object not initializing in a project

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.

Android AudioRecord fails to initialise(Other solutions not working)

Step 1) Check your manifest to ensure add RECORD_AUDIO permission under application section. e.g.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.colibri.audioloopback">

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

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

</manifest>

Step 2) If your device is M or later, you need to grant the permssion from Settings->App->Your App->Permissions.

Step 3) Refer to below code snippet if still doesn't work.

   public void audioRecordLoop() throws Exception {
        Log.e(TAG,"start audioRecordLoop");
        int channelConfig = mChannels == 2?
                AudioFormat.CHANNEL_IN_STEREO:
                AudioFormat.CHANNEL_IN_MONO;
        int bufferSize = AudioRecord.getMinBufferSize(
                mSampleRateHz, channelConfig, mAudioEncoding);
        mAudioRecord = new AudioRecord(
                mAudioSource, mSampleRateHz, channelConfig, mAudioEncoding, bufferSize);// The RAW PCM sample recording

        if (mAudioRecord.getState() != AudioRecord.STATE_INITIALIZED) {
            Log.e(TAG,"AudioRecord init failed");
            return;
        }
        final short[] buffer = new short[mBlockSize];
        mAudioRecord.startRecording();
        int len = 0;
        while (mbExit == false) {
            len = mAudioRecord.read(buffer, 0, mBlockSize);
            if (len < 0) {
                Log.e(TAG,"read error " + len);
                return;
            }
        }
        mAudioRecord.stop();
        mAudioRecord.release();
    }

It should work now!

Android AudioRecord - Won't Initialize 2nd time

I was able to reproduce your problem (on a Samsung phone). I added an onDestroy() method releasing the record:

@Override
public void onDestroy() { 
    super.onDestroy();
    System.out.println("OnDestroy");
    audRec.release();
}

After adding this, the audioRecord seems to initialize correctly every time the activity is started.

AudioRecord can not be initialized

Try this instead:

private MediaRecorder mRecorder = null;
private void startRecording() {
        String fileSaveName = generateNameForAudioFile();
        mRecorder = new MediaRecorder();
        mRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
        mRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
        mRecorder.setOutputFile(fileSaveName);
        mRecorder.setAudioEncoder(MediaRecorder.AudioEncoder.DEFAULT);

        try {
            mRecorder.prepare();
        } catch (IOException e) {
            Log.e(LOG_TAG, "prepare() failed");
        }

        mRecorder.start();
    }



private void stopRecording() {
        startRecording.setEnabled(true);
        try {
            if (mRecorder != null) {
                mRecorder.stop();
                mRecorder.release();
                mRecorder = null;
            }
        } catch (Exception e) {
        }

    }

public String generateNameForAudioFile() {

        String audioName = GetrandFilename();
        mFileName = Environment.getExternalStorageDirectory().getPath() + "/"
                + audioName + "myaudio" + ".3gp";

        );
        return mFileName;
    }



@Override
    public void onPause() {
        super.onPause();

            try {
                if (mRecorder != null) {
                    mRecorder.stop();
                    mRecorder.release();
                    mRecorder = null;
                }
            } catch (Exception e) {
            }
              }

Let me know if this post is of any help.

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