从EditText获取所有主题标签 [英] Get all hashtags from EditText

问题描述

我有一个 EdiText .用户可以在其中提及主题标签.我想获取这些主题标签并将其添加到 ArrayList .如何从 EdiText 获取这些主题标签.

I have an EdiText. User can mention hashtags in it. I want to get those hashtags and add them to an ArrayList. How can I get those hashtags from EdiText.

假设我的 edittxtmsg 包含 #Stackoverflow让我#hashtag#问题

我想要这些标签: #Stackoverflow #hashtag #problem

edittxtmsg.addTextChangedListener(new TextWatcher() {

                @Override
                public void onTextChanged(CharSequence s, int start,
                        int before, int count) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void beforeTextChanged(CharSequence s, int start,
                        int count, int after) {
                    // TODO Auto-generated method stub

                }

                @Override
                public void afterTextChanged(Editable s) {
                    // TODO Auto-generated method stub

                    int strLenght = s.toString().length();
                    int available = 140 - strLenght;
                    setAvailableSpace(available);
                    if (available < 0) {
                        s.delete(strLenght - 1, strLenght);
                    }
                    mfinalmsg = s.toString();


                }

                private void setAvailableSpace(int available) {
                    // TODO Auto-generated method stub
                    tvcount.setText(available + "");
                }
            });

推荐答案

您可以使用正则表达式从 EditText 中获取所有主题标签:

You can use Regular Expression to get all hashtags from EditText:

import java.util.regex.Matcher;
import java.util.regex.Pattern;

String text = editText.getText().toString();
String regexPattern = "(#\\w+)";

Pattern p = Pattern.compile(regexPattern);
Matcher m = p.matcher(text);
while (m.find()) {
    String hashtag = m.group(1);
    // Add hashtag to ArrayList
    ...
}

(#\\ w +)与所有以#开头的主题标签匹配.

(#\\w+) matches all hashtags that start with #.

这也很快.

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