各位朋友，求带！android studio，地图开发，setThreshold报红，cannot resolve symbol

Question

protected void initAutoCompleteTextView()
{
_attv_dstAddr.setThreshold**/cannot resolve method in textview/**(1);//是终点地址输入一个字后能加载出相关的地址列表信息
_attv_dstAddr.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) {
        final String keyword = _attv_dstAddr.getText().toString();
        if(keyword == null || keyword.length() == 0){
            return;
        }
        InputtipsQuery query = new InputtipsQuery(keyword,_city);

        Inputtips search = new Inputtips(getApplicationContext(),query);

        search.setInputtipsListener(new Inputtips.InputtipsListener() {
            @Override
            public void onGetInputtips(List<Tip> list, int i) {
                if(i != 1000) {
                    return;
                }

            }
            ArrayList<String> poiList = new ArrayList<String>();

            for (int index = 0;index < list**/*cannot resolve symbol 'list'*/**.size(); index++ )
            {
                poiList.add(list.get(index).getName());

            }
            ArrayAdapter<String> adapter = new ArrayAdapter<String>(getApplicationContext(),
                    android.R.layout.simple_list_item_1,poiList);
            _attv_dstAddr.setAdapter**/*cannot resolve symbol 'setAdapter*/**(adapter);
            adapter.notifyDataSetChange**/*cannot resolve symbol 'notifyDataSetChange*/**();


        });
        search.requestInputtipsAsyn();
    }

    @Override
    public void afterTextChanged(Editable s) {

    }
});

}

Answer 1

_attv_dstAddr这个控件是什么类型的？