java - 从 EditText 获取所有主题标签

Question

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

假设我的 edittxtmsg包含 #Stackoverflow slove me #hashtag #problem
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 + "");
                }
            });

Answer 1

您可以使用正则表达式从 EditText 获取所有主题标签:

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+)匹配所有以 # 开头的主题标签.

这个也很快。