对EditText输入字数限制并提示

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private int num = 500;//详情描述限制的最大字数

etDetailDescription.addTextChangedListener(new TextWatcher() {    @Override    public void beforeTextChanged(CharSequence s, int start, int count, int after) {    }    @Override    public void onTextChanged(CharSequence s, int start, int before, int count) {        Editable editable = etDetailDescription.getText();        int len = editable.length();        if (len > num) {            showToast("超出字数限制");            int selEndIndex = Selection.getSelectionEnd(editable);            String str = editable.toString();            //截取新字符串            String newStr = str.substring(0, num);            etDetailDescription.setText(newStr);            editable = etDetailDescription.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);        }    }    @Override    public void afterTextChanged(Editable s) {    }});

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