the android app crashes after 6 seconds when I press record button

Question

                Toast.makeText(MainActivity.this, "Recording...", Toast.LENGTH_SHORT).show();
                final Handler handler = new Handler();
                handler.postDelayed(new Runnable() {
                    @Override
                    public void run() {
                        //Do something after 6s
                        Toast.makeText(MainActivity.this, "Stopped Recording", Toast.LENGTH_SHORT).show();

                        mediaRecorder.stop();
                        mediaRecorder.release();
                        setupMediaRecorder();
                    }
                }, 6000);

The app crashes after 6 seconds when I start recording, here is my setup media recorder function:

   private void setupMediaRecorder()
{
    mediaRecorder= new MediaRecorder();
    mediaRecorder.setAudioSamplingRate(8000);
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.OGG);
   // mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.OGG);
    mediaRecorder.setOutputFile(pathSave);
}

logcat: The error occurs at mediaRecorder.Stop(); in handler

2019-10-10 01:11:49.942 21574-21574/com.example.parkinsonsdisease E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.example.parkinsonsdisease, PID: 21574
java.lang.IllegalStateException
    at android.media.MediaRecorder._stop(Native Method)
    at android.media.MediaRecorder.stop(MediaRecorder.java:1378)
    at com.example.parkinsonsdisease.MainActivity$1$1.run(MainActivity.java:93)

Answer 1

See the documentation:

public void stop ()

...

Throws

IllegalStateException if it is called before start()

Answer 2

As @LeoLeontev mentioned, it's most likely because you haven't called prepare() and start() .

Any call to stop() must be preceded by a call to start() , and start() must be preceded by a call to prepare() .

In other words,

private void setupMediaRecorder()
{
    mediaRecorder= new MediaRecorder();
    ...
    mediaRecorder.prepare();
}

private void startRecording()
{
    mediaRecorder.start();
}

See this diagram for reference: MediaRecorder State Diagram

Also, please see the MediaRecorder documentation here .

Answer 3

After following the steps given in MediaRecorder State diagram , I used set encoder and output format in this order and solved the problem facing above:

    private void setupMediaRecorder()
{
    mediaRecorder= new MediaRecorder();
    mediaRecorder.setAudioSource(MediaRecorder.AudioSource.MIC);
    mediaRecorder.setAudioSamplingRate(8000);
    mediaRecorder.setOutputFormat(MediaRecorder.OutputFormat.THREE_GPP);
    mediaRecorder.setAudioEncoder(MediaRecorder.OutputFormat.AMR_NB);
    mediaRecorder.setOutputFile(pathSave);

}