如何在简单适配器android中添加多个单词？

Question

我正在构建一个 android 应用程序，我在其中使用自动完成文本来显示对 google 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 space，它将停止显示任何结果。

例如。 - 在写文本 "new" 时，它会提示我 "new dehli"、"new zealand" 等，当我在单词 "new" 后使用 space 时，它会停止显示任何内容结果。我尝试了几件事： - 输入 = input.replaceAll(" ","%20");

调试后，我检查结果出来了，但它们没有使用适配器添加到我的简单列表中。但是看起来简单的列表适配器没有添加 space 字符并且没有显示结果。

这是代码 -

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;
}
}

感谢帮助。

Answer 1

用这个修复你的解析器任务：

        @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。

如何在简单适配器android中添加多个单词？

How to add multiple words in simple adapter android?

android

google-maps

autocomplete