Android EditText限制输入字数的方法

本文实例讲述了android edittext限制输入字数的方法。分享给大家供大家参考，具体如下：

//新浪微博字数限制
private static final int weibo_content_length_limited = 140;
//添加微博内容edittext
minputedittext.addtextchangedlistener(mtextwatcher);
private textwatcher mtextwatcher = new textwatcher() {
    private int editstart;
    private int editend;
    public void aftertextchanged(editable s) {
      editstart = minputedittext.getselectionstart();
      editend = minputedittext.getselectionend();
      // 先去掉监听器，否则会出现栈溢出
      minputedittext.removetextchangedlistener(mtextwatcher);
      while (minputedittext.gettext().tostring().length() > weibo_content_length_limited) {
        s.delete(editstart - 1, editend);
        editstart--;
        editend--;
      }
      minputedittext.settext(s);
      minputedittext.setselection(editstart);
      minputedittext.addtextchangedlistener(mtextwatcher);
      setpromptcontent();
    }
    public void beforetextchanged(charsequence s, int start, int count, int after) {
    }
    public void ontextchanged(charsequence s, int start, int before, int count) {
    }
};
/**
* refresh prompt content numbers
*/
private void setpromptcontent() {
  int contentlength = minputedittext.gettext().tostring().length();
  minputedittext.setselection(contentlength);
  int limitedlength = weibo_content_length_limited - contentlength;
  string prefix = getresources().getstring(r.string.weibo_content_numbers_prefix);
    string suffix = getresources().getstring(r.string.weibo_content_numbers_suffix);
    string promptcontentnumbers = prefix + limitedlength + suffix;
    spannablestringbuilder style = new spannablestringbuilder(promptcontentnumbers);
    style.setspan(new foregroundcolorspan(color.red), prefix.length(), promptcontentnumbers.length() - suffix.length(),
        spannable.span_exclusive_exclusive);
    mpromptcontentnumbers.settext(style);
}

更多关于android控件相关内容感兴趣的读者可查看本站专题：《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。