NumberTextWatchers

import android.text.Editable;
import android.text.TextWatcher;
import android.widget.EditText;

import java.text.DecimalFormat;
import java.text.ParseException;

public class NumberTextWatcher implements TextWatcher {


    private final DecimalFormat dfnd;

    private final EditText et;

    public NumberTextWatcher(EditText et) {
        dfnd = new DecimalFormat("#,###");
        dfnd.setMaximumFractionDigits(0);
        this.et = et;
    }

    @SuppressWarnings("unused")
    private static final String TAG = "NumberTextWatcher";

    public void afterTextChanged(Editable s) {
        et.removeTextChangedListener(this);

        try {
            int inilen, endlen;
            inilen = et.getText().length();

            String v = s.toString().replace(".", "");
            Number n = dfnd.parse(v);
            int cp = et.getSelectionStart();
            et.setText(dfnd.format(n).replace(",", "."));
            endlen = et.getText().length();
            int sel = (cp + (endlen - inilen));
            if (sel > 0 && sel <= et.getText().length()) {
                et.setSelection(sel);
            } else {
                // place cursor at the end?
                et.setSelection(et.getText().length() - 1);
            }
        } catch (NumberFormatException | ParseException nfe) {
            // do nothing?
            nfe.printStackTrace();
        }

        et.addTextChangedListener(this);
    }

    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
    }

    public void onTextChanged(CharSequence s, int start, int before, int count) {

    }

}