Java – Android AudioRecord failed to initialize (other solutions do not work)

I checked and tried all the other threads for hours today but none of the solutions worked.

I have tried filtering all available audio options. I’ve granted the app the appropriate permissions.

Goal: I’m trying to get this audio stream so I can get the frequency of the audio.

My stuff

public int audioSource = MediaRecorder.AudioSource.MIC;
public int channelConfig = AudioFormat.CHANNEL_IN_MONO;
public int audioEncoding = AudioFormat.ENCODING_PCM_16BIT;
public AudioRecord audioRecord = null;
private Thread recordingThread = null;
public int blockSize = 256;                                deal with this many samples at a time
public int sampleRate = 8000;                              Sample rate in Hz

Later….

 int bufferSize = AudioRecord.getMinBufferSize(sampleRate, channelConfig, audioEncoding);
    AudioRecord audioeeeeRecord = new AudioRecord(audioSource, sampleRate, channelConfig, audioEncoding, bufferSize);    The RAW PCM sample recording
    audioRecord = audioeeeeRecord;
    if (audioRecord != null && audioRecord.getState() != AudioRecord.STATE_INITIALIZED)
        try {
            throw new Exception("AudioRecord init failed");                    audioRecord = findAudioRecord();
        } catch (Exception e) {
            e.printStackTrace();
        }
    final short[] buffer = new short[blockSize];

try {

audioRecord.startRecording();
    } catch (Exception e) {
        e.printStackTrace();
    }

This throws the following error ( http://pastebin.com/raw/3wmA4cku ):

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.
         W/System.err: java.lang.Exception: AudioRecord init failed
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:102)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at android.view.View.performClick(View.java:5697)
         W/System.err:     at android.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at android.os.Looper.loop(Looper.java:158)
         W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
         W/System.err: java.lang.IllegalStateException: startRecording() called on an uninitialized AudioRecord.
         W/System.err:     at android.media.AudioRecord.startRecording(AudioRecord.java:943)
         W/System.err:     at app.mobile.mobileecg.MainActivity.startReading(MainActivity.java:114)
         W/System.err:     at app.mobile.mobileecg.MainActivity$1.onClick(MainActivity.java:58)
         W/System.err:     at android.view.View.performClick(View.java:5697)
         W/System.err:     at android.view.View$PerformClick.run(View.java:22526)
         W/System.err:     at android.os.Handler.handleCallback(Handler.java:739)
         W/System.err:     at android.os.Handler.dispatchMessage(Handler.java:95)
         W/System.err:     at android.os.Looper.loop(Looper.java:158)
         W/System.err:     at android.app.ActivityThread.main(ActivityThread.java:7229)
         W/System.err:     at java.lang.reflect.Method.invoke(Native Method)
         W/System.err:     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
         W/System.err:     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)

Step 1) Check your list to make sure RECORD_AUDIO permissions are added under the Applications section. For example

<?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 permissions from Settings > Apps – > your Apps – > permission.

Step 3) If it still doesn’t work, reference the code below fragment.

   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 be okay now!