Android Open Source - CoHomeAndroid Places Auto Complete Adapter

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License

The source code is released under:

Apache License

Java Source Code

package com.cohome.util;
/* ww  w  .j a v  a 2s  .  c  om*/
import java.io.IOException;
import java.io.InputStreamReader;
import java.net.HttpURLConnection;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLEncoder;
import java.util.ArrayList;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import android.content.Context;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;

public class PlacesAutoCompleteAdapter extends ArrayAdapter<String> implements Filterable {
    private ArrayList<String> 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) {
                    // 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 static final String LOG_TAG = "CoHomeAndroid";

  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 = "AIzaSyDg5-mLqlFXngGNadn4t3cJbNxLD7SVETE";

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

          URL url = new URL(sb.toString());
          Log.e(LOG_TAG, "URL: "+url);
          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;
  }
}

Java Source Code List

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