EditText要實(shí)現(xiàn)每次刪除固定位置的@的昵稱，其實(shí)就是要在字符串中查找到每個(gè)昵稱的開始和結(jié)束位置。這邊用正則表達(dá)式匹配的每個(gè)昵稱的位置。具體代碼如下

        editText.setOnKeyListener(new View.OnKeyListener() {
            @Override
            public boolean onKey(View view, int keyCode, KeyEvent event) {
                EditText editText = (EditText) view;
                Editable editable = editText.getText();
                //獲取光標(biāo)所在位置
                int selectionStart = editText.getSelectionStart();
                String content = editable.toString().substring(0, selectionStart);
                Pattern pattern = Pattern.compile(".*@.+\\s");
                Matcher matcher = pattern.matcher(content);
                //查詢字符串中是否有以@開頭和空格結(jié)尾的格式
                if (matcher.find() && event.getAction() == KeyEvent.ACTION_DOWN) {
                    if (TextUtils.equals(matcher.group(), content) && keyCode == KeyEvent.KEYCODE_DEL) {
                        ArrayList<Integer> indexs = new ArrayList<>();
                        Pattern patternSub = Pattern.compile("@.+?\\s");
                        Matcher matcherSub = patternSub.matcher(content);
                        while (matcherSub.find()) {
                            indexs.add(matcherSub.start());
                        }
                        if (indexs.size() > 0) {
                            //刪除距離光標(biāo)最近的符合篩選邏輯的字符串
                            editable.delete(indexs.get(indexs.size() - 1),content.length());
                            return true;
                        }
                    }
                }
                return false;
            }
        });

    ~~~