谷歌的地方API为Android找到城市 [英] Google place API for android to find city

问题描述

我见过的教程（教程）使用自动填充文本找到城市鉴于android.i已经做了指示一切，但现在，当我打<一href="https://maps.googleapis.com/maps/api/place/autocomplete/json?sensor=false&key=API_KEY&input=sa">this网址

I have seen the tutorial( tutorial ) to find the city using autocomplete text view in android.i have done everything that is instructed but now when i hit this url

它总是抛出我异常说：的java.net.UnknownHostException：无法解析主机maps.googleapis.com：没有与主机名关联的地址

it always throws me an exception saying : java.net.UnknownHostException: Unable to resolve host "maps.googleapis.com": No address associated with hostname

但相同的URL做工精细，当我通过浏览器击中，我得到的结果也。

but the same url work fine when i hit through browser and i am getting the results also.

下面是code I M打带：

Here is the code i m hitting with :

public class PlacesAutoCompleteAdapter extends ArrayAdapter< String > implements Filterable{
 private ArrayList<String> resultList;
 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 = "I have generated the correct api key also";


public PlacesAutoCompleteAdapter(Context context, int textViewResourceId) {
    super(context, textViewResourceId);

}


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

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

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:in");
        sb.append("&input=" + URLEncoder.encode(input, "utf8"));
      // sb.append("&input=" + input);

       System.out.println("URL ---------------: "+sb.toString());
        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) {
        e.printStackTrace();
       // 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;
}

}

哎呀！对不起大家。 我发现这是一个愚蠢的犯错误的解决方案还没有确定清单中的INTERNET权限。

oops! sorry guys. I have found the solution that was a silly mistake.I had not defined the INTERNET permission in the manifest.

推荐答案

请检查您是否在您的清单中添加INTERNET权限。

Please check if you have added INTERNET permission in your manifest.

<uses-permission android:name="android.permission.INTERNET"></uses-permission>

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