Android: TextView in ScrollView continous scrolling

Sometimes when continuously outputting text to TextView, you would like it to scroll down:

textView.addTextChangedListener(new TextWatcher() {
    @Override public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    @Override public void onTextChanged(CharSequence s, int start, int before, int count) {
        // scroll down whenever log text updated to display latest info on the screen        

        scrollView.post(new Runnable() {
            @Override public void run() {
                scrollView.fullScroll(ScrollView.FOCUS_DOWN);
            }
        });
    }

    @Override public void afterTextChanged(Editable s) {
    }
});

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