监听EditText中的字数，并且超出字数时显示红色字体_移动开发_编程开发_程序员俱乐部

效果图：

监听" border="0" alt="监听" src="/Upload/Images/2013101618/79D8CD816B455387.png" width="244" height="79" />

主要代码：

mEditText.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before,
                    int count) {
                uploadTitle = mEditText.getText().toString().trim();
                String length = uploadTitle.length() + "/" + maxTitle;
                if (uploadTitle.length() > maxTitle) {

//防止Toast被输入键盘遮挡，将Toast显示在屏幕中间
                    ToastUtil.MidToast(getActivity(),
                            "已超过" + (uploadTitle.length() - maxTitle) + ""
                                    + "个字！");
//如果字数超出了限定，则将其颜色变为红色                   

SpannableStringBuilder builder = new SpannableStringBuilder(
                            length);
                    builder.setSpan(new ForegroundColorSpan(Color.RED), 0, 2,
                            Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                    tv_upload_titlelength.setText(builder);
                } else {
                    tv_upload_titlelength.setText(length);
                }
            }