Question

我正在制作一本字典应用程序。我有一个AutoCompleteTextView和大型字符串列表。当我将ArrayAdapter设置为AutoCompleteTextView而不缩小它时，它会冻结。这就是我决定用TextWatcher设置Adapter的原因。 textView上的文本更改，textView适配器更改。但是当我尝试使用onitemClickListener选择所选项时，它会返回indexoutofboundsException，因为textWatcher在onclickListener和适配器更改之前工作。 有没有办法检查TextWatcher中是否单击了该项？谢谢你的帮助

final AutoCompleteTextView textView =  (AutoCompleteTextView) rootView.findViewById(R.id.autoCompleteTextView1);
    textView.addTextChangedListener(new TextWatcher() {

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                if(s.length() != 0){
                    db.openDataBase();
                     wl = db.getWordList(s.toString());
                    ArrayAdapter<String>  adapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_dropdown_item_1line, wl.getWordList());
                    textView.setAdapter(adapter);
                }
            }


        textView.setOnItemClickListener(new AdapterView.OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> parent, View view,
                    int position, long id) {
                if(parent.getItemAtPosition(position) != null);
                    Log.i("Debug",parent.getItemAtPosition(position)+"");
                }


        });

这是错误 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370): 05-30 10:30:14.789: E/AndroidRuntime(10370):

Answer 1

感谢您的帮助。我了解到可以使用autoCompleteTextView.isPerformingOperation()检查是否点击了dropdownitem。所以现在我的新代码看起来像

    @Override
        public void onTextChanged(CharSequence s, int start, int before, int count) {
  //doesn't work if list is clicked
            if(s.length() != 0 && !textView.isPerformingCompletion()){
                db.openDataBase();
                 wl = db.getWordList(s.toString());
                ArrayAdapter<String>  adapter = new ArrayAdapter<String>(getActivity(),android.R.layout.simple_dropdown_item_1line, wl.getWordList());
                textView.setAdapter(adapter);
            }
        }

检查是否单击了setOnItemClickListener

1 个答案: