如何在简单的适配器android中添加多个单词？

Question

我正在构建一个 android 应用程序，我在其中使用 AutoComplete 文本来显示对谷歌地名的搜索。现在我面临的问题是，如果我在 2 个单词之间输入空格，它将停止显示任何结果。

例如。 - 在写“新”文字时，它会提示我“新德里”、“新西兰”等，当我在“新”字后使用空格时，它会停止显示任何结果。我已经尝试了几件事： - input = input.replaceAll(" ","%20");

调试后，我检查了结果是否出现，但它们没有使用适配器添加到我的简单列表中。但看起来简单的列表适配器没有添加空格字符并且没​​有显示结果。

这里是代码 -

1. oncreateview -

   atvPlaces = (AutoCompleteTextView) findViewById(R.id.atv_places);
   atvPlaces.setThreshold(1);      
   
   atvPlaces.addTextChangedListener(new TextWatcher() {
   
       @Override
       public void onTextChanged(CharSequence s, int start, int before, int 
       count) {                
           placesTask = new PlacesTask();              
           placesTask.execute(s.toString());
       }
   
       @Override
       public void beforeTextChanged(CharSequence s, int start, int count,
               int after) {
           // TODO Auto-generated method stub
       }
   
       @Override
       public void afterTextChanged(Editable s) {
           // TODO Auto-generated method stub              
       }
   });
   
     /** A method to download json data from url */
     private String downloadUrl(String strUrl) throws IOException{
     String data = "";
   InputStream iStream = null;
   HttpURLConnection urlConnection = null;
   try{
           URL url = new URL(strUrl);                
   
           // Creating an http connection to communicate with url 
           urlConnection = (HttpURLConnection) url.openConnection();
   
           // Connecting to url 
           urlConnection.connect();
   
           // Reading data from url 
           iStream = urlConnection.getInputStream();
   
           BufferedReader br = new BufferedReader(new InputStreamReader(iStream));
   
           StringBuffer sb  = new StringBuffer();
   
           String line = "";
           while( ( line = br.readLine())  != null){
                   sb.append(line);
           }
   
           data = sb.toString();
   
           br.close();
   
   }catch(Exception e){
           Log.d("Exception while downloading url", e.toString());
   }finally{
           iStream.close();
           urlConnection.disconnect();
   }
   return data;
    }  
   
    // Fetches all places from GooglePlaces AutoComplete Web Service
    private class PlacesTask extends AsyncTask<String, Void, String>{
   
   @Override
   protected String doInBackground(String... place) {
       // For storing data from web service
       String data = "";
   
       // Obtain browser key from https://code.google.com/apis/console
       String key = "key=AIzaSyC3qD9x9SbFGgK69xGtmyieAKaS0kMcpLE";
   
       String input="";
   
   
   
       try {
           input = "input=" + URLEncoder.encode(place[0], "utf-8");
           input = input.replaceAll(" ", "%20");
       } catch (UnsupportedEncodingException e1) {
           e1.printStackTrace();
       }       
   
   
       // place type to be searched
       String types = "types=geocode";
   
       // Sensor enabled
       String sensor = "sensor=false";         
   
       // Building the parameters to the web service
       String parameters = input+"&"+types+"&"+sensor+"&"+key;
   
       // Output format
       String output = "json";
   
       // Building the url to the web service
       String url = 
   
    "https://maps.googleapis.com/maps/api/place/autocomplete/"+output+"?"+
   
     parameters;
   
       try{
           // Fetching the data from web service in background
           data = downloadUrl(url);
       }catch(Exception e){
           Log.d("Background Task",e.toString());
       }
       return data;        
   }
   
   @Override
   protected void onPostExecute(String result) {           
       super.onPostExecute(result);
   
       // Creating ParserTask
       parserTask = new ParserTask();
   
       // Starting Parsing the JSON string returned by Web Service
       parserTask.execute(result);
   }       
   }
   
   
    /** A class to parse the Google Places in JSON format */
     private class ParserTask extends AsyncTask<String, Integer, 
     List<HashMap<String,String>>>{
   
   JSONObject jObject;
   
   @Override
   protected List<HashMap<String, String>> doInBackground(String...   
   jsonData) {         
   
       List<HashMap<String, String>> places = null;
   
       PlaceJSONParser placeJsonParser = new PlaceJSONParser();
   
       try{
           jObject = new JSONObject(jsonData[0]);
   
           // Getting the parsed data as a List construct
           places = placeJsonParser.parse(jObject);
   
       }catch(Exception e){
           Log.d("Exception",e.toString());
       }
       return places;
   }
   
   @Override
   protected void onPostExecute(List<HashMap<String, String>> result) {            
   
           String[] from = new String[] { "description"};
           int[] to = new int[] { android.R.id.text1 };
   
           // Creating a SimpleAdapter for the AutoCompleteTextView            
           SimpleAdapter adapter = new SimpleAdapter(getBaseContext(),  
           result, android.R.layout.simple_list_item_1, from, to);             
   
           Toast.makeText(getApplicationContext(), placesTask+"", 
                      Toast.LENGTH_LONG).show();
   
           // Setting the adapter
           atvPlaces.setAdapter(adapter);
   }           
   }    
   

这里是 placejson 代码 -

public class PlaceJSONParser {

/**
 * Receives a JSONObject and returns a list
 */
public List<HashMap<String, String>> parse(JSONObject jObject) {

    JSONArray jPlaces = null;
    try {
        /** Retrieves all the elements in the 'places' array */
        jPlaces = jObject.getJSONArray("predictions");
    } catch (JSONException e) {
        e.printStackTrace();
    }
    /** Invoking getPlaces with the array of json object
     * where each json object represent a place
     */
    return getPlaces(jPlaces);
}


private List<HashMap<String, String>> getPlaces(JSONArray jPlaces) {
    int placesCount = jPlaces.length();
    List<HashMap<String, String>> placesList = new ArrayList<HashMap<String, String>>();
    HashMap<String, String> place = null;

    /** Taking each place, parses and adds to list object */
    for (int i = 0; i < placesCount; i++) {
        try {
            /** Call getPlace with place JSON object to parse the place */
            place = getPlace((JSONObject) jPlaces.get(i));
            placesList.add(place);

        } catch (JSONException e) {
            e.printStackTrace();
        }
    }

    return placesList;
}

/**
 * Parsing the Place JSON object
 */
private HashMap<String, String> getPlace(JSONObject jPlace) {

    HashMap<String, String> place = new HashMap<String, String>();

    String id = "";
    String reference = "";
    String description = "";

    try {

        description = jPlace.getString("description");
        id = jPlace.getString("id");
        reference = jPlace.getString("reference");

        place.put("description", description);
        place.put("_id", id);
        place.put("reference", reference);

    } catch (JSONException e) {
        e.printStackTrace();
    }
    return place;
}
}

感谢您的帮助。

Answer 1

用这个修复你的 Parser 任务：

        @Override
    protected void onPostExecute(List<HashMap<String, String>> result) {
        String[] from = new String[] {"description"};
        int[] to = new int[] { android.R.id.text1 };

        SimpleAdapter adapter = new SimpleAdapter(MainActivity.this, result,
                android.R.layout.simple_list_item_1, from, to);
        atvPlaces.setAdapter(adapter);
        atvPlaces.performValidation();
        atvPlaces.showDropDown();
    }
}

它强制 AutoCompleteTextView 更新建议。