This watchers format entered value as # ###,##. Backspace working right every time

MoneyWatcher.java

public class Watcher implements TextWatcher {
	private static final char THOUSANDS_SEPARATOR = ' ';
	private static final char FRACTION_SEPARATOR = ',';

	private boolean mIsSpaceRemoved;
	private int mRemovedSpacePosition;
	private EditText mValueEditText;
	private InputFilter[] mFilters;

	public Watcher(EditText valueEditText) {
		mValueEditText = valueEditText;
		mFilters = mValueEditText.getFilters();
	}

	@Override
	public void beforeTextChanged(CharSequence charSequence, int start, int count, int after) {
		if (start > 0 && count == 1) {
			mIsSpaceRemoved = charSequence.charAt(start) == THOUSANDS_SEPARATOR;
			if (mIsSpaceRemoved) {
				mRemovedSpacePosition = start;
			}
		}
	}

	@Override
	public void onTextChanged(CharSequence charSequence, int start, int before, int count) {
	}

	@Override
	public void afterTextChanged(Editable editable) {
		if (mIsSpaceRemoved) {
			mIsSpaceRemoved = false;
			editable.replace(mRemovedSpacePosition - 1, mRemovedSpacePosition, "");
		}

		mValueEditText.removeTextChangedListener(this);

		mValueEditText.setFilters(new InputFilter[]{});

		int position = -1;
		for (int i = 0; i < editable.length(); i++) {
			if (editable.charAt(i) == THOUSANDS_SEPARATOR) {
				editable.replace(i, i + 1, "");
				i--;
				continue;
			}
			if (editable.charAt(i) == FRACTION_SEPARATOR) {
				if (position >= 0) {
					editable.replace(position, position + 1, "");
				}
				position = i;
			}
		}
		if (position != -1 && position + 3 < editable.length()) {
			editable.replace(position + 3, editable.length(), "");

		}
		position = position != -1 ? position : editable.length();

		for (int i = position - 3; i >= 0; i = i - 3) {
			editable.insert(i, String.valueOf(THOUSANDS_SEPARATOR));
		}

		mValueEditText.setFilters(mFilters);

		mValueEditText.addTextChangedListener(this);
	}
}