如何僅在用戶輸入文字時獲得自動填充結果

Question

這聽起來很簡單，但對我來說很難。我有一個顯示用戶位置地址的自動完成textview。如果用戶輸入除位置以外的其他位置，我還實現了一個地址API來獲取地址。一切都按照它應有的方式工作，但即使已經有地址，地點結果仍然顯示。爲了降低成本，我希望僅在用戶輸入地址時才能獲得地址結果。我做了一個全球性的布爾值，並將其設置真當文本被改變，像這樣：

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) { 

      } 
     }); 

然後我檢查時，我把我的適配器作爲這樣的布爾是真實的：

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); 
       } 
      }); 
     } 

但這樣做在我的活動的oncreate方法只是阻止自動完成顯示任何地方提示結果。我怎樣才能在這裏完成我的目標？像往常一樣，任何幫助都非常感謝。

這是我的自定義適配器類：

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

這裏是我的想法來實現這一目標。

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 
      } 
     }); 

希望它能幫助

Answer 2

我會建議你只是重構它作爲一種方法像這裏

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); 
       } 
      }); 
    } 

，並調用它裏面afterTextChanged方法喜歡這裏，和隱藏自動完成後即

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