正则表达式 IP

package com.example.localsocketdemo;


import android.app.Activity;
import android.os.Bundle;
import android.text.InputFilter;
import android.text.Spanned;
import android.widget.EditText;


public class RegularExpressions extends Activity{
private EditText edt1,edt2;

private void setIpInputFilter(EditText text) {
InputFilter[] filters = new InputFilter[1];
filters[0] = new InputFilter() {
public CharSequence filter(CharSequence source, int start, int end,
Spanned dest, int dstart, int dend) {
if (end > start) {
String destTxt = dest.toString();
String resultingTxt = destTxt.substring(0, dstart)
+ source.subSequence(start, end)
+ destTxt.substring(dend);
/**
* Bruce 正则表达式，判断输入的IP/网关/子网掩码是否符合标准
*/
if (!resultingTxt.matches("^\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3}(\\.(\\d{1,3})?)?)?)?)?)?")) {
return "";
} else {
String[] splits = resultingTxt.split("\\.");
for (int i = 0; i < splits.length; i++) {
if (Integer.valueOf(splits[i]) > 255) {
return "";
}
}
}
}
return null;
}
};


text.setFilters(filters);
}

private void initButton(){
edt1 = (EditText)findViewById(R.id.editText1);
edt2 = (EditText)findViewById(R.id.editText2);
setIpInputFilter(edt1);
setIpInputFilter(edt2);
}


@Override
protected void onCreate(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onCreate(savedInstanceState);
setContentView(R.layout.regularexpressions);

initButton();
}
}