Feb 20, 2014

Android NumberTextWatcher

package helper;

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

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

public class NumberTextWatcher implements TextWatcher {
   
    private DecimalFormat df;
    private DecimalFormat dfnd;
    private boolean hasFractionalPart;
   
    private EditText et;
   
    public NumberTextWatcher(EditText et)
    {
        df = new DecimalFormat("#,###.##");
        df.setDecimalSeparatorAlwaysShown(true);
        dfnd = new DecimalFormat("#,###");
        this.et = et;
        hasFractionalPart = false;
    }
   
    @SuppressWarnings("unused")
    private static final String TAG = "NumberTextWatcher";

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

        try {
        int inilen, endlen;
        inilen = et.getText().length();
       
        String v = s.toString().replace(String.valueOf(df.getDecimalFormatSymbols().getGroupingSeparator()), "");
        Number n = df.parse(v);
        int cp = et.getSelectionStart();
        if (hasFractionalPart) {
        et.setText(df.format(n));
        } else {
        et.setText(dfnd.format(n));
        }
        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 nfe) {
        // do nothing?
        } catch (ParseException e) {
        // do nothing?
    }

    et.addTextChangedListener(this);
    }

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

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count)
    {
        if (s.toString().contains(String.valueOf(df.getDecimalFormatSymbols().getDecimalSeparator())))
        {
        hasFractionalPart = true;
        } else {
        hasFractionalPart = false;
        }
    }

}

using
txtAmount=(EditText)findViewById(R.id.txtAmount);
NumberTextWatcher watcher= new NumberTextWatcher(txtAmount);
        txtAmount.addTextChangedListener(watcher);

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