java - 在 android 中通过 httpconnection 查询时，位置自动完成 url 不返回任何内容

Question

我正在使用 google 文档中的以下代码来获取 android 应用程序的自动完成位置 api。在自动完成 TextView 中键入时，此代码不会在下拉列表中显示任何结果。

class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
private ArrayList<String> resultList;
private static final String LOG_TAG = "Buzz";

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 = "AIzaSyCPrebeTr0lmiyjSwc1fdK82ZXLsmleSKc";

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("?key=" + API_KEY);
        sb.append("&components=country:in");
        sb.append("&input=" + URLEncoder.encode(input, "utf8"));
        sb.append("&types=(cities)&language=iw");

        Log.v(LOG_TAG,"URL for places: "+sb.toString());

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

        if (!(conn instanceof HttpURLConnection)) 
        {
            Log.v(LOG_TAG,"Connection not created ");
        }

        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);
            Log.v(LOG_TAG,"Value in input stream buffer: "+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");

        Log.v(LOG_TAG,"Predictions for given query: "+predsJsonArray.length());

        // 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"));

            Log.v(LOG_TAG,"Results for the given url: "+predsJsonArray.getJSONObject(i).getString("description"));
        }
    } catch (JSONException e) {
        Log.e(LOG_TAG, "Cannot process JSON results", e);
    }

    return resultList;
}

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) 
            {
                Log.v(LOG_TAG,"Search string: "+constraint.toString());
                // 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;
}

}

此in.read(buff)代码返回157，如何获取输入查询的自动完成

Answer 1

您在浏览器中得到预期的响应吗？我得到"status" : "REQUEST_DENIED"当我使用你的值时，但可能你已经为服务器/浏览器 API key 设置了允许的 IP。

如果您想使用提供 GooglePlaceAutoComplete 的库小部件，查看 Sprockets (我是开发商)。使用 API key 进行设置后，您可以将可用的 Places API 自动完成功能添加到您的布局中，如下所示:

<net.sf.sprockets.widget.GooglePlaceAutoComplete
    xmlns:sprockets="http://schemas.android.com/apk/res-auto"
    android:id="@+id/place"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    sprockets:types="(cities)"
    sprockets:countries="IN"
    sprockets:language="iw"/>