如何在 Android 上设置最大字数限制EditText
我知道如何设置字符限制,但我正在寻找字数限制.
您需要添加一个TextChangedListener
给你的EditText
然后应用一个InputFilter
请参阅以下代码。
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,以便用户不能粘贴超出所需的单词。你可以拦截AndroidEditText
粘贴事件[阅读更多] https://stackoverflow.com/a/14981376/185022
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