“@”字符键入Android的AutoCompleteTextView

2023年4月23日 165次阅读

我有一个社交消息应用程序,我正在创建一个用户名字符串列表,并希望edittext在键入消息和键入“@”时显示用户列表.

我该怎么做呢？

最佳答案 您可以添加TextWatcher并动态更改AutoCompleteTextView的适配器.仅更改数组并调用notifyDataSetChanged()似乎不起作用.

   autoCompleteView.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {

            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                    int occurrences = 0;
                    String enteredString = s.toString();
                    for (char c : enteredString.toCharArray()) {
                        if (c == '@') {
                            occurrences++;
                        }
                    }
                    if (occurrences == 1) {
                        String requiredString = enteredString.substring(0, enteredString.indexOf("@"));
                        email[0] = requiredString + "@gmail.com";
                        email[1] = requiredString + "@hotmail.com";
                         .
                         .
                        email[10] = requiredString + "@yahoo.com";
                        adapter = null;
                        adapter = new ArrayAdapter<>(MyActivity.this, android.R.layout.simple_list_item_1, email);
                        autoCompleteView.showDropDown();
                        autoCompleteView.setThreshold(0);
                        autoCompleteView.setAdapter(adapter );
                    } else if (occurrences == 0) {
                        autoCompleteView.dismissDropDown();
                    }

            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

这用于在输入“@”时显示域列表.您可以修改代码以满足您的需求.

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