NameValuePair abstract class
abstract class NameValuePair { final String _name; final String _value; NameValuePair(this._name,this._value); String getName() => _name; String getValue() => _value; }
abstract class NameValuePair { final String _name; final String _value; NameValuePair(this._name,this._value); String getName() => _name; String getValue() => _value; }