So Android code includes AddTextChangedListener that implements TextWatcher() and its methods. Android also includes OnQueryTextListener() and its methods. And there are many uses cases listed here on stackoverflow for each.

I have set up a SearchView on EditTexts. The EditTexts populate CardViews in a Recyclerview list of items. In this case, which listener is preferred for text input and search?

**private TextWatcher search = new TextWatcher()** {

    @Override
    public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) {

    }

    @Override
    public void afterTextChanged(Editable editable) {

    }
};

versus:

@Override
public boolean onCreateOptionsMenu(Menu menu) {

    ...
    **searchView.setOnQueryTextListener(queryTextListener);**        
}

@Override
public boolean onQueryTextSubmit(String query) {
    //
}

@Override
public boolean onQueryTextChange(String newText) {
    //
}