如何仅在用户输入文本时获得自动完成结果

Question

这听起来很容易，但对我来说很难。我有一个显示用户位置地址的自动完成文本视图。我还实现了一个位置api，如果用户输入的不是他们的位置，则可以获取地址。一切都像预期的那样工作，但即使已经有地址，位置结果仍然显示。为了降低成本，我希望仅在用户输入地址时获得地址结果。我做了一个全局布尔值，并在文本更改时设置为true，如下所示：

autocomplete.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) {
                isTextEntered = true;  //to get autocomplete get results only after user enters text
            }

            @Override
            public void afterTextChanged(Editable s) {

            }
        });

然后，在设置适配器时，检查布尔值是否为true：

if (isTextEntered) {
            autocomplete.setAdapter(new GooglePlacesAutocompleteAdapter(this, R.layout.search_results_list_item, R.id.tvSearchResultItem));
            autocomplete.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    final String selectedPlace = (String) parent.getItemAtPosition(position);
                    autocomplete.setText(selectedPlace);
                }
            });
        }

但在我的活动的oncreate方法中这样做只会阻止自动完成显示任何位置提示结果。我怎样才能在这里实现我的目标？一如既往，我们非常感谢您的帮助。

这是我的自定义适配器类：

class GooglePlacesAutocompleteAdapter extends ArrayAdapter implements Filterable {

        private ArrayList resultList;
        //private ArrayList<HashMap<String, Place>> results = new ArrayList<>();

        public GooglePlacesAutocompleteAdapter(Context context, int list, int textViewResourceId) {

            super(context, list, textViewResourceId);
        }

        @Override
        public int getCount() {
            return resultList.size();
        }

        @Override
        public String getItem(int index) {
            return resultList.get(index).toString();
        }

        //@Override
        //public HashMap<String, Place>  getItem(int index) {return results.get(index);}

        @Override
        public Filter getFilter() {
            Filter filter = new Filter() {

                @Override
                protected FilterResults performFiltering(CharSequence constraint) {
                    FilterResults filterResults = new FilterResults();
                    if (constraint != null) {
                        // Retrieve the autocomplete results.
                        resultList = autocomplete(constraint.toString());
                        // Assign the data to the FilterResults
                        filterResults.values = resultList;
                        filterResults.count = resultList.size();
                    }
                    return filterResults;
                }

                @Override
                protected void publishResults(CharSequence constraint, FilterResults results) {
                    if (results != null && results.count > 0) {
                        notifyDataSetChanged();
                    } else {
                        notifyDataSetInvalidated();
                    }
                }
            };
            return filter;
        }
    }

Answer 1

我建议你把它重构成这样一种方法

public void setSelectedPlace() {
            autocomplete.setAdapter(new GooglePlacesAutocompleteAdapter(this, R.layout.search_results_list_item, R.id.tvSearchResultItem));
            autocomplete.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                    final String selectedPlace = (String) parent.getItemAtPosition(position);
                    autocomplete.setText(selectedPlace);
                }
            });
  }

然后在类似此处的afterTextChanged方法中调用它，然后隐藏自动完成

@Override
 public void afterTextChanged(Editable s) {
     setSelectedPlace();
  // hide the autocomplete
 }

Answer 2

这是我实现这一目标的想法。

complete.addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                  // 1. init autocomplete 
                  // 2. show autocomplete
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
               // 1. get enter text
               // 2. update the datasource of autocomplete adapter
            }

            @Override
            public void afterTextChanged(Editable s) {
               // hide the autocomplete
            }
        });

希望有帮助