android – 如何限制AutoCompleteTextView下拉列表？

我使用AutoCompleteText自动完成用户当前所在的位置,locationList只是我在strings.xml文件中编写的数组,所以在这里使用自己的字符串数组.

locationList = res.getStringArray(R.array.ticketLocation);

        ArrayAdapter<String> locationAdapter = new ArrayAdapter<String>(this,android.R.layout.simple_list_item_1,locationList);

        AutoCompleteTextView textView = (AutoCompleteTextView) findViewById(R.id.txtCountries);
        textView.setThreshold(1);
        textView.setAdapter(locationAdapter);
        textView.setValidator(new Validator());
        textView.setonFocuschangelistener(new FocusListener());

        textView.setonItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent,View view,int position,long id) {
                // Todo Auto-generated method stub
                TextView ticketLocation = (TextView) view;
                getTicketLocation = ticketLocation.getText().toString();
            }
        });

以下是用于验证位置字段中输入文本的代码,fixText()方法阻止用户键入字符串数组中不存在的文本,例如：如果用户键入“germany”,则不存在于你的字符串数组列表,它将被替换为“”,这是你的edittext输入字段中的空字符串

class Validator implements AutoCompleteTextView.Validator {

        @Override
        public boolean isValid(CharSequence text) {
            // Log.v("Test","Checking if valid: " + text);
            Arrays.sort(locationList);
            if (Arrays.binarySearch(locationList,text.toString()) > 0) {
                return true;
            }

            return false;
        }

        @Override
        public CharSequence fixText(CharSequence invalidText) {
            // Log.v("Test","Returning fixed text");

            /*
             * I'm just returning an empty string here,so the field will be
             * blanked,but you Could put any kind of action here,like popping
             * up a dialog?
             *
             * Whatever value you return here must be in the list of valid
             * words.
             */
            return "";
        }
    }

    class FocusListener implements View.OnFocuschangelistener {

        @Override
        public void onFocusChange(View v,boolean hasFocus) {
            // Log.v("Test","Focus changed");
            if (v.getId() == R.id.txtCountries && !hasFocus) {
                // Log.v("Test","Performing validation");
                ((AutoCompleteTextView) v).performValidation();
            }
        }
    }