Question

Well I can start the thread when I press togglebutton to ON and it works fine, that thread is to start audiorecord and audiotrack.
But I cannot stop the thread when I put togglebutton OFF… because I cannot do thread.stop… What I want to do is just stop audiorecord and audiotrack… If there is any way to start/stop them w/o making thread will be also fine.
Also, as I cannot stop thread, when I do togglebutton ON – OFF – ON, it makes an error because can’t start a thread 2 times.

Answer 1

The stop() method of Thread has been Deprecated (because it inherently unsafe) and java provides an alternative way to stop a Thread. Its a very simple approach, as described in this official link:

http://docs.oracle.com/javase/1.4.2/docs/guide/misc/threadPrimitiveDeprecation.html

Did you try making the isRecording variable global and then altering its state:

 isRecording = false;

 Thread thread;

 Runnable r = new Runnable() {
public void run() {
    isRecording = true;
    android.os.Process
            .setThreadPriority(android.os.Process.THREAD_PRIORITY_URGENT_AUDIO);
    int buffersize = AudioRecord.getMinBufferSize(8000,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    arec = new AudioRecord(MediaRecorder.AudioSource.MIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, buffersize);
    int bufferzize = AudioTrack.getMinBufferSize(11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT);
    atrack = new AudioTrack(AudioManager.STREAM_MUSIC, 11025,
            AudioFormat.CHANNEL_CONFIGURATION_MONO,
            AudioFormat.ENCODING_PCM_16BIT, bufferzize,
            AudioTrack.MODE_STREAM);
    atrack.setPlaybackRate(11025);
    byte[] buffer = new byte[buffersize];
    if (arec.getState() == AudioRecord.STATE_INITIALIZED)
        arec.startRecording();
    if (atrack.getState() == AudioTrack.STATE_INITIALIZED)
        atrack.play();
    while (isRecording) {
        arec.read(buffer, 0, buffersize);
        atrack.write(buffer, 0, buffer.length);
    }
}

};

tbs = (ToggleButton) findViewById(R.id.tbS);
tbs.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {

    public void onCheckedChanged(CompoundButton buttonView,
            boolean isChecked) {
        // TODO Auto-generated method stub
        if (isChecked) {
            thread = new Thread(r)
            thread.start();
            } else {
          isRecording = false;
          thread = null;
        }

    }
});