Android – AutoCompleteTextView with Google Places Autocomplete API

Step 1 :- Create New Android Project.



Step 2 :- Add Google-play-services_lib to your project.

Step 3 :- Open AndroidManifest.xml file.

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.mapv2.demo"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="16" />
   
    <uses-permission android:name="android.permission.INTERNET"/>

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.mapv2.demo.MainActivity"
            android:label="@string/app_name" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />               
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

Step 4 :- Open activity_main.xml.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity" >

    <com.mapv2.demo.CustomAutoCompleteTextView
        android:id="@+id/atv_places"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"       
        android:layout_alignParentTop="true"
        android:textColor="#000000"
        android:hint="@string/str_atv_places" />

</RelativeLayout>

Step 5 :- Open MainActivity.java

package com.mapv2.demo;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.net.URLEncoder;
import java.util.HashMap;
import java.util.List;

import org.json.JSONObject;

import android.app.Activity;
import android.os.AsyncTask;
import android.os.Bundle;
import android.text.Editable;
import android.text.TextWatcher;
import android.util.Log;
import android.view.Menu;
import android.widget.AutoCompleteTextView;
import android.widget.SimpleAdapter;

public class MainActivity extends Activity {

    AutoCompleteTextView atvPlaces;
    PlacesTask placesTask;
    ParserTask parserTask;
   
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
       
        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=AIzaSyCfdXATlz7jtM6MEvy9Xh_3_g_Ivc5ysXE";
           
            String input="";
           
            try {
                input = "input=" + URLEncoder.encode(place[0], "utf-8");
            } 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);               
               
                // Setting the adapter
                atvPlaces.setAdapter(adapter);
        }           
    }   
   
    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        // Inflate the menu; this adds items to the action bar if it is present.
        getMenuInflater().inflate(R.menu.activity_main, menu);
        return true;
    }
}



1.) PlaceJSONParser.java


package com.mapv2.demo;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

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


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;
    }
}

2.) CustomAutoCompleteTextView.java


package com.mapv2.demo;

import java.util.HashMap;

import android.content.Context;
import android.util.AttributeSet;
import android.widget.AutoCompleteTextView;

/** Customizing AutoCompleteTextView to return Place Description  
 *  corresponding to the selected item
 */
public class CustomAutoCompleteTextView extends AutoCompleteTextView {
   
    public CustomAutoCompleteTextView(Context context, AttributeSet attrs) {
        super(context, attrs);
    }

    /** Returns the place description corresponding to the selected item */
    @Override
    protected CharSequence convertSelectionToString(Object selectedItem) {
        /** Each item in the autocompetetextview suggestion list is a hashmap object */
        HashMap<String, String> hm = (HashMap<String, String>) selectedItem;
        return hm.get("description");
    }
   
}

Step 6 :- Run Code.

Step 7 :- Download Code :- https://dl.dropboxusercontent.com/u/109954727/Map/map13.zip