EditTextUtil 监听输入字数

package com.toge.ta.utils;

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

/**
 * Created by Administrator on 2015/10/21.
 */
public class EditTextUtil {
    /*
    　　* 监听输入内容是否超出最大长度，并设置光标位置
    　　* */
    public static class MaxLengthWatcher implements TextWatcher {

        private int maxLen = 0;
        private EditText editText = null;

        public MaxLengthWatcher(int maxLen, EditText editText) {
            this.maxLen = maxLen;
            this.editText = editText;
        }

        public void afterTextChanged(Editable arg0) {

//            Selection.setSelection(arg0, arg0.toString().length());
            // TODO Auto-generated method stub
        }

        public void beforeTextChanged(CharSequence arg0, int arg1, int arg2,
                                      int arg3) {
            // TODO Auto-generated method stub

        }

        public void onTextChanged(CharSequence arg0, int arg1, int arg2, int arg3) {
            // TODO Auto-generated method stub
            Editable editable = editText.getText();
            String s = editable + "";
            int len = editable.length();

                len = StringUtil.stringLength(s);

            if (len > maxLen) {
                int selEndIndex = Selection.getSelectionEnd(editable);
                String str = editable.toString();
                //截取新字符串
                String newStr = StringUtil.cutString(str, maxLen);
                editText.setText(newStr);
                editable = editText.getText();
                //新字符串的长度
                int newLen = editable.length();
                //旧光标位置超过字符串长度
                if (selEndIndex > newLen) {
                    selEndIndex = editable.length();
                }
                //设置新光标所在的位置
                Selection.setSelection(editable, selEndIndex);
            }
        }
    }
}