Android如何设置最大“字数"对EditText的限制 [英] Android How to set maximum "word" limit on EditText

问题描述

如何在Android上设置最大字数限制EditText我知道如何设置字符数限制，但是我正在寻找字数限制.

How to set maximum word limit on Android EditText I know how to set character limit but I am looking for Word Limit.

推荐答案

您需要在EditText中添加TextChangedListener，然后应用InputFilter，请参见以下代码.

You need to add a TextChangedListener to your EditText then apply an InputFilter see the following code.

edDesc.addTextChangedListener(new TextWatcher() {

    @Override
    public void onTextChanged(CharSequence s, int start, int before, int count) {}

    @Override
    public void beforeTextChanged(CharSequence s, int start, int count, int after) {
        int wordsLength = countWords(s.toString());// words.length;
        // count == 0 means a new word is going to start
        if (count == 0 && wordsLength >= MAX_WORDS) {
            setCharLimit(edDesc, edDesc.getText().length());
        } else {
            removeFilter(edDesc);
        }

        tvWordCount.setText(String.valueOf(wordsLength) + "/" + MAX_WORDS);
        }

    @Override
    public void afterTextChanged(Editable s) {}
});

private int countWords(String s) {
    String trim = s.trim();
    if (trim.isEmpty())
        return 0;
    return trim.split("\\s+").length; // separate string around spaces
}

private InputFilter filter;

private void setCharLimit(EditText et, int max) {
    filter = new InputFilter.LengthFilter(max);
    et.setFilters(new InputFilter[] { filter });
}

private void removeFilter(EditText et) {
    if (filter != null) {
        et.setFilters(new InputFilter[0]);
        filter = null;
    }
}

您必须拦截粘贴"事件，以便用户粘贴的单词不能超过要求的单词.您可以拦截Android EditText粘贴事件 [了解详情]

You have to intercept Paste event so that user shouldn't be able to paste more than required words. You can intercept Android EditText Paste event [read more]

这篇关于Android如何设置最大“字数"对EditText的限制的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！