如何在Android中实现Google Places API？

Question

我正在开发一款应用程序，允许用户通过实施Google Places API来定位附近的场所。但是，关于如何实现这一点，没有任何全面的教程/示例。我已经能够拼凑一些代码，但我仍然不知道如何解析结果，然后将其显示在覆盖层上。任何帮助是极大的赞赏。

Answer 1

你知道哪里更具体的问题在哪里（解析结果或放置引脚）？你看到什么类型的错误？

为了解析Places API的结果，有一个在教程： https://developers.google.com/academy/apis/maps/places/autocomplete-android

从教程下面的代码应该可以帮助您开始使用分析结果。为自动完成和搜索API返回的JSON类似，但不相同。请务必遵循https://developers.google.com/places/documentation/#PlaceSearchResults的格式。

private static final String LOG_TAG = "ExampleApp"; 

private static final String PLACES_API_BASE = "https://maps.googleapis.com/maps/api/place"; 
private static final String TYPE_AUTOCOMPLETE = "/autocomplete"; 
private static final String OUT_JSON = "/json"; 

private static final String API_KEY = "YOUR_API_KEY"; 

private ArrayList<String> autocomplete(String input) { 
    ArrayList<String> resultList = null; 

    HttpURLConnection conn = null; 
    StringBuilder jsonResults = new StringBuilder(); 
    try { 
     StringBuilder sb = new StringBuilder(PLACES_API_BASE + TYPE_AUTOCOMPLETE + OUT_JSON); 
     sb.append("?sensor=false&key=" + API_KEY); 
     sb.append("&components=country:uk"); 
     sb.append("&input=" + URLEncoder.encode(input, "utf8")); 

     URL url = new URL(sb.toString()); 
     conn = (HttpURLConnection) url.openConnection(); 
     InputStreamReader in = new InputStreamReader(conn.getInputStream()); 

     // Load the results into a StringBuilder 
     int read; 
     char[] buff = new char[1024]; 
     while ((read = in.read(buff)) != -1) { 
      jsonResults.append(buff, 0, read); 
     } 
    } catch (MalformedURLException e) { 
     Log.e(LOG_TAG, "Error processing Places API URL", e); 
     return resultList; 
    } catch (IOException e) { 
     Log.e(LOG_TAG, "Error connecting to Places API", e); 
     return resultList; 
    } finally { 
     if (conn != null) { 
      conn.disconnect(); 
     } 
    } 

    try { 
     // Create a JSON object hierarchy from the results 
     JSONObject jsonObj = new JSONObject(jsonResults.toString()); 
     JSONArray predsJsonArray = jsonObj.getJSONArray("predictions"); 

     // Extract the Place descriptions from the results 
     resultList = new ArrayList<String>(predsJsonArray.length()); 
     for (int i = 0; i < predsJsonArray.length(); i++) { 
      resultList.add(predsJsonArray.getJSONObject(i).getString("description")); 
     } 
    } catch (JSONException e) { 
     Log.e(LOG_TAG, "Cannot process JSON results", e); 
    } 

    return resultList; 
}