Can't stop listening

Hi!

Thank you a lot for your sharing your work!

`stopListening()` does nothing. The visualizer is still updated.

__Context :__
I want to start listening when I click on the start button, then stop when I click on another button.

### Did anybody face this behavior?

```java
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, Bundle savedInstanceState) {
view = inflater.inflate(R.layout.record_sound, container, false);
visualizer = view.findViewById(R.id.visualizer);

view.findViewById(R.id.start).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
visualizer.startListening();
}
});

view.findViewById(R.id.stop).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
visualizer.stopListening();
}
});
return view;
}
```