Android Auto Place Suggestion ( using Google APIs)

anchit

17 June 2018

Hi, in this blog we will learn how we can implement the auto place suggestion feature in our android application and make our application more efficient.

I will show you how we can achieve something like in the working of the Google maps search bar.

See the image below

Implementing something like this is super easy, all you need to do is follow this article.

Things you need to get started :

Android Studio
Google Developer Account
Firebase Account

Before you start coding :

Get your map and places api key from google developer console by enabling places and maps Sdk for android and google places and maps api. A total of 4 apis namely :
1) Places SDK for Android
2) Maps SDK for Android
3) Places API
4) Maps Static APISave the key obtained from here in your Android Manifet.xml file

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.webkul.mobikul.mapdemoapplication">

    <application
        //..>
        //..

        <!-- Goolge MAP API Key -->
        <meta-data
            android:name="com.google.android.maps.v2.API_KEY"
            android:value="REPLACE_WITH_YOUR_MAPS_API_KEY" />
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="REPLACE_WITH_YOUR_PLACES_API_KEY" />
        // NOTE : A Single key can also be used here

        //..
    </application>

</manifest>

<manifest xmlns:android="http://schemas.android.com/apk/res/android"

package="com.webkul.mobikul.mapdemoapplication">

<application

//..>

//..

<meta-data

android:name="com.google.android.maps.v2.API_KEY"

android:value="REPLACE_WITH_YOUR_MAPS_API_KEY" />

<meta-data

android:name="com.google.android.geo.API_KEY"

android:value="REPLACE_WITH_YOUR_PLACES_API_KEY" />

// NOTE : A Single key can also be used here

//..

</application>

</manifest>

Open build.gradle of your root android project and check these lines, Add if needed

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {
    //...
    dependencies {
        classpath 'com.android.tools.build:gradle:3.1.1'
        classpath 'com.google.gms:google-services:3.2.0'
        

        // NOTE: Do not place your application dependencies here; they belong
        // in the individual module build.gradle files
    }
 //....
}

// Top-level build file where you can add configuration options common to all sub-projects/modules.

buildscript {

//...

dependencies {

classpath 'com.android.tools.build:gradle:3.1.1'

classpath 'com.google.gms:google-services:3.2.0'

// NOTE: Do not place your application dependencies here; they belong

// in the individual module build.gradle files

}

//....

}

Open build.gradle of your module and add these dependencies

dependencies {
    //...
    // Google Maps
    api "com.google.android.gms:play-services-maps:15.0.1"
    api 'com.google.maps:google-maps-services:0.1.20'
    api 'com.google.maps.android:android-maps-utils:0.5'
    api 'com.google.android.gms:play-services-places:15.0.1'
   //...
}

dependencies {

//...

// Google Maps

api "com.google.android.gms:play-services-maps:15.0.1"

api 'com.google.maps:google-maps-services:0.1.20'

api 'com.google.maps.android:android-maps-utils:0.5'

api 'com.google.android.gms:play-services-places:15.0.1'

//...

}

After these initial steps, you are good to start writing code.

APPROACH :

We are using the AutoCompleteTextView to get what user types and will display the suggestions accordingly.
We need to create the adapter for the AutoCompleteTextView
Finally, we will display the result selected by the user.

CODE :

activity_main.xml file

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <AutoCompleteTextView
        android:id="@+id/location_actv"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:hint="@string/search_your_location"
        android:gravity="center_vertical"
        android:padding="8dp"
        android:layout_margin="16dp"
        />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical"
        android:layout_alignParentBottom="true"
        android:layout_margin="16dp"
        >

        <TextView
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:text="The result will be displayed here"
            />

        <TextView
            android:id="@+id/address_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />
        <TextView
            android:id="@+id/location_display_tv"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            />

    </LinearLayout>

</RelativeLayout>

<?xml version="1.0" encoding="utf-8"?>

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:app="http://schemas.android.com/apk/res-auto"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:layout_height="match_parent"

tools:context=".MainActivity">

<AutoCompleteTextView

android:id="@+id/location_actv"

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:layout_gravity="center_horizontal"

android:hint="@string/search_your_location"

android:gravity="center_vertical"

android:padding="8dp"

android:layout_margin="16dp"

<LinearLayout

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:orientation="vertical"

android:layout_alignParentBottom="true"

android:layout_margin="16dp"

<TextView

android:layout_width="match_parent"

android:layout_height="wrap_content"

android:text="The result will be displayed here"

<TextView

android:id="@+id/address_tv"

android:layout_width="match_parent"

android:layout_height="wrap_content"

<TextView

android:id="@+id/location_display_tv"

android:layout_width="match_parent"

android:layout_height="wrap_content"

</LinearLayout>

</RelativeLayout>

MainActivity.java

public class MainActivity extends AppCompatActivity {

    private AutoCompleteTextView locationSearchActv;// instance of AutoCompleteText View
    private TextView addressTv, locationDataTv; // TextViews Used to display the adddress selected by the user

    private GeoDataClient mGeoDataClient; 
    private PlaceAutocompleteAdapter mPlaceAutocompleteAdapter;

    private static final LatLngBounds LAT_LNG_BOUNDS_DEFAULT = new LatLngBounds(
            new LatLng(-34.041458, 150.790100), new LatLng(-33.682247, 151.383362)); // The suggestion within this geometrical boundary will be displayed on top.




    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        locationSearchActv = (AutoCompleteTextView)findViewById(R.id.location_actv);
        addressTv = (TextView) findViewById(R.id.address_tv);
        locationDataTv = (TextView)findViewById(R.id.location_display_tv);
        mGeoDataClient = Places.getGeoDataClient(this);
        mPlaceAutocompleteAdapter = new PlaceAutocompleteAdapter(this,mGeoDataClient, LAT_LNG_BOUNDS_DEFAULT,null);
        locationSearchActv.setAdapter(mPlaceAutocompleteAdapter);
        locationSearchActv.setOnItemClickListener(mAutocompleteClickListener);
    }

    private AdapterView.OnItemClickListener mAutocompleteClickListener
            = new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
            /*
             Retrieve the place ID of the selected item from the Adapter.
             The adapter stores each Place suggestion in a AutocompletePrediction from which we
             read the place ID and title.
              */
            final AutocompletePrediction item = mPlaceAutocompleteAdapter.getItem(position);
            final String placeId = item.getPlaceId();


            /*
             Issue a request to the Places Geo Data Client to retrieve a Place object with
             additional details about the place.
              */
            Task<PlaceBufferResponse> placeResult = mGeoDataClient.getPlaceById(placeId);
            placeResult.addOnCompleteListener(mUpdatePlaceDetailsCallback);
        }
    };

    private OnCompleteListener<PlaceBufferResponse> mUpdatePlaceDetailsCallback
            = new OnCompleteListener<PlaceBufferResponse>() {
        @Override
        public void onComplete(Task<PlaceBufferResponse> task) {
            try {
                PlaceBufferResponse places = task.getResult();

                // Get the Place object from the buffer.
                final Place place = places.get(0);
                addressTv.setText(place.getAddress().toString());
                locationDataTv.setText("Latitude : "+String.valueOf(place.getLatLng().latitude)+"\n Longitude : "+String.valueOf(place.getLatLng().longitude));
                places.release();
            } catch (RuntimeRemoteException e) {
                // Request did not complete successfully
                return;
            }
        }
    };
}

public class MainActivity extends AppCompatActivity {

private AutoCompleteTextView locationSearchActv;// instance of AutoCompleteText View

private TextView addressTv, locationDataTv; // TextViews Used to display the adddress selected by the user

private GeoDataClient mGeoDataClient;

private PlaceAutocompleteAdapter mPlaceAutocompleteAdapter;

private static final LatLngBounds LAT_LNG_BOUNDS_DEFAULT = new LatLngBounds(

new LatLng(-34.041458, 150.790100), new LatLng(-33.682247, 151.383362)); // The suggestion within this geometrical boundary will be displayed on top.

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

locationSearchActv = (AutoCompleteTextView)findViewById(R.id.location_actv);

addressTv = (TextView) findViewById(R.id.address_tv);

locationDataTv = (TextView)findViewById(R.id.location_display_tv);

mGeoDataClient = Places.getGeoDataClient(this);

mPlaceAutocompleteAdapter = new PlaceAutocompleteAdapter(this,mGeoDataClient, LAT_LNG_BOUNDS_DEFAULT,null);

locationSearchActv.setAdapter(mPlaceAutocompleteAdapter);

locationSearchActv.setOnItemClickListener(mAutocompleteClickListener);

}

private AdapterView.OnItemClickListener mAutocompleteClickListener

= new AdapterView.OnItemClickListener() {

@Override

public void onItemClick(AdapterView<?> parent, View view, int position, long id) {

Retrieve the place ID of the selected item from the Adapter.

The adapter stores each Place suggestion in a AutocompletePrediction from which we

read the place ID and title.

final AutocompletePrediction item = mPlaceAutocompleteAdapter.getItem(position);

final String placeId = item.getPlaceId();

Issue a request to the Places Geo Data Client to retrieve a Place object with

additional details about the place.

Task<PlaceBufferResponse> placeResult = mGeoDataClient.getPlaceById(placeId);

placeResult.addOnCompleteListener(mUpdatePlaceDetailsCallback);

}

};

private OnCompleteListener<PlaceBufferResponse> mUpdatePlaceDetailsCallback

= new OnCompleteListener<PlaceBufferResponse>() {

@Override

public void onComplete(Task<PlaceBufferResponse> task) {

try {

PlaceBufferResponse places = task.getResult();

// Get the Place object from the buffer.

final Place place = places.get(0);

addressTv.setText(place.getAddress().toString());

locationDataTv.setText("Latitude : "+String.valueOf(place.getLatLng().latitude)+"\n Longitude : "+String.valueOf(place.getLatLng().longitude));

places.release();

} catch (RuntimeRemoteException e) {

// Request did not complete successfully

return;

}

};

}

PlaceAutoCompleteAdapter.java

/*
 * Copyright (C) 2015 Google Inc. All Rights Reserved.
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package com.webkul.mobikul.mapdemoapplication;

import android.content.Context;
import android.graphics.Typeface;
import android.text.style.CharacterStyle;
import android.text.style.StyleSpan;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.Filter;
import android.widget.Filterable;
import android.widget.TextView;
import android.widget.Toast;

import com.google.android.gms.common.data.DataBufferUtils;
import com.google.android.gms.location.places.AutocompleteFilter;
import com.google.android.gms.location.places.AutocompletePrediction;
import com.google.android.gms.location.places.AutocompletePredictionBufferResponse;
import com.google.android.gms.location.places.GeoDataClient;
import com.google.android.gms.maps.model.LatLngBounds;
import com.google.android.gms.tasks.RuntimeExecutionException;
import com.google.android.gms.tasks.Task;
import com.google.android.gms.tasks.Tasks;

import java.util.ArrayList;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;

/**
 * Adapter that handles Autocomplete requests from the Places Geo Data Client.
 * {@link AutocompletePrediction} results from the API are frozen and stored directly in this
 * adapter. (See {@link AutocompletePrediction#freeze()}.)
 */
public class PlaceAutocompleteAdapter
        extends ArrayAdapter<AutocompletePrediction> implements Filterable {

    private static final String TAG = "PlaceAutocompleteAdapt";
    private static final CharacterStyle STYLE_BOLD = new StyleSpan(Typeface.BOLD);
    /**
     * Current results returned by this adapter.
     */
    private ArrayList<AutocompletePrediction> mResultList;

    /**
     * Handles autocomplete requests.
     */
    private GeoDataClient mGeoDataClient;

    /**
     * The bounds used for Places Geo Data autocomplete API requests.
     */
    private LatLngBounds mBounds;

    /**
     * The autocomplete filter used to restrict queries to a specific set of place types.
     */
    private AutocompleteFilter mPlaceFilter;

    /**
     * Initializes with a resource for text rows and autocomplete query bounds.
     *
     * @see ArrayAdapter#ArrayAdapter(Context, int)
     */
    public PlaceAutocompleteAdapter(Context context, GeoDataClient geoDataClient,
                                    LatLngBounds bounds, AutocompleteFilter filter) {
        super(context, android.R.layout.simple_expandable_list_item_2, android.R.id.text1);
        mGeoDataClient = geoDataClient;
        mBounds = bounds;
        mPlaceFilter = filter;
    }

    /**
     * Sets the bounds for all subsequent queries.
     */
    public void setBounds(LatLngBounds bounds) {
        mBounds = bounds;
    }

    /**
     * Returns the number of results received in the last autocomplete query.
     */
    @Override
    public int getCount() {
        return mResultList.size();
    }

    /**
     * Returns an item from the last autocomplete query.
     */
    @Override
    public AutocompletePrediction getItem(int position) {
        return mResultList.get(position);
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        View row = super.getView(position, convertView, parent);

        // Sets the primary and secondary text for a row.
        // Note that getPrimaryText() and getSecondaryText() return a CharSequence that may contain
        // styling based on the given CharacterStyle.

        AutocompletePrediction item = getItem(position);

        TextView textView1 = (TextView) row.findViewById(android.R.id.text1);
        TextView textView2 = (TextView) row.findViewById(android.R.id.text2);
        textView1.setText(item.getPrimaryText(STYLE_BOLD));
        textView2.setText(item.getSecondaryText(STYLE_BOLD));

        return row;
    }

    /**
     * Returns the filter for the current set of autocomplete results.
     */
    @Override
    public Filter getFilter() {
        return new Filter() {
            @Override
            protected FilterResults performFiltering(CharSequence constraint) {
                FilterResults results = new FilterResults();

                // We need a separate list to store the results, since
                // this is run asynchronously.
                ArrayList<AutocompletePrediction> filterData = new ArrayList<>();

                // Skip the autocomplete query if no constraints are given.
                if (constraint != null) {
                    // Query the autocomplete API for the (constraint) search string.
                    filterData = getAutocomplete(constraint);
                }

                results.values = filterData;
                if (filterData != null) {
                    results.count = filterData.size();
                } else {
                    results.count = 0;
                }

                return results;
            }

            @Override
            protected void publishResults(CharSequence constraint, FilterResults results) {

                if (results != null && results.count > 0) {
                    // The API returned at least one result, update the data.
                    mResultList = (ArrayList<AutocompletePrediction>) results.values;
                    notifyDataSetChanged();
                } else {
                    // The API did not return any results, invalidate the data set.
                    notifyDataSetInvalidated();
                }
            }

            @Override
            public CharSequence convertResultToString(Object resultValue) {
                // Override this method to display a readable result in the AutocompleteTextView
                // when clicked.
                if (resultValue instanceof AutocompletePrediction) {
                    return ((AutocompletePrediction) resultValue).getFullText(null);
                } else {
                    return super.convertResultToString(resultValue);
                }
            }
        };
    }

    /**
     * Submits an autocomplete query to the Places Geo Data Autocomplete API.
     * Results are returned as frozen AutocompletePrediction objects, ready to be cached.
     * Returns an empty list if no results were found.
     * Returns null if the API client is not available or the query did not complete
     * successfully.
     * This method MUST be called off the main UI thread, as it will block until data is returned
     * from the API, which may include a network request.
     *
     * @param constraint Autocomplete query string
     * @return Results from the autocomplete API or null if the query was not successful.
     * @see GeoDataClient#getAutocompletePredictions(String, LatLngBounds, AutocompleteFilter)
     * @see AutocompletePrediction#freeze()
     */
    private ArrayList<AutocompletePrediction> getAutocomplete(CharSequence constraint) {
        Log.i(TAG, "Starting autocomplete query for: " + constraint);

        // Submit the query to the autocomplete API and retrieve a PendingResult that will
        // contain the results when the query completes.
        Task<AutocompletePredictionBufferResponse> results =
                mGeoDataClient.getAutocompletePredictions(constraint.toString(), mBounds,
                        mPlaceFilter);

        // This method should have been called off the main UI thread. Block and wait for at most
        // 60s for a result from the API.
        try {
            Tasks.await(results, 60, TimeUnit.SECONDS);
        } catch (ExecutionException | InterruptedException | TimeoutException e) {
            e.printStackTrace();
        }

        try {
            AutocompletePredictionBufferResponse autocompletePredictions = results.getResult();

            Log.i(TAG, "Query completed. Received " + autocompletePredictions.getCount()
                    + " predictions.");

            // Freeze the results immutable representation that can be stored safely.
            return DataBufferUtils.freezeAndClose(autocompletePredictions);
        } catch (RuntimeExecutionException e) {
            // If the query did not complete successfully return null
            Toast.makeText(getContext(), "Error contacting API: " + e.toString(),
                    Toast.LENGTH_SHORT).show();
            Log.e(TAG, "Error getting autocomplete prediction API call", e);
            return null;
        }
    }
}

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

* Licensed under the Apache License, Version 2.0 (the "License");

* you may not use this file except in compliance with the License.

* You may obtain a copy of the License at

* http://www.apache.org/licenses/LICENSE-2.0

* Unless required by applicable law or agreed to in writing, software

* distributed under the License is distributed on an "AS IS" BASIS,

* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

* See the License for the specific language governing permissions and

* limitations under the License.

package com.webkul.mobikul.mapdemoapplication;

import android.content.Context;

import android.graphics.Typeface;

import android.text.style.CharacterStyle;

import android.text.style.StyleSpan;

import android.util.Log;

import android.view.View;

import android.view.ViewGroup;

import android.widget.ArrayAdapter;

import android.widget.Filter;

import android.widget.Filterable;

import android.widget.TextView;

import android.widget.Toast;

import com.google.android.gms.common.data.DataBufferUtils;

import com.google.android.gms.location.places.AutocompleteFilter;

import com.google.android.gms.location.places.AutocompletePrediction;

import com.google.android.gms.location.places.AutocompletePredictionBufferResponse;

import com.google.android.gms.location.places.GeoDataClient;

import com.google.android.gms.maps.model.LatLngBounds;

import com.google.android.gms.tasks.RuntimeExecutionException;

import com.google.android.gms.tasks.Task;

import com.google.android.gms.tasks.Tasks;

import java.util.ArrayList;

import java.util.concurrent.ExecutionException;

import java.util.concurrent.TimeUnit;

import java.util.concurrent.TimeoutException;

/**

* Adapter that handles Autocomplete requests from the Places Geo Data Client.

* {@link AutocompletePrediction} results from the API are frozen and stored directly in this

* adapter. (See {@link AutocompletePrediction#freeze()}.)

public class PlaceAutocompleteAdapter

extends ArrayAdapter<AutocompletePrediction> implements Filterable {

private static final String TAG = "PlaceAutocompleteAdapt";

private static final CharacterStyle STYLE_BOLD = new StyleSpan(Typeface.BOLD);

/**

* Current results returned by this adapter.

private ArrayList<AutocompletePrediction> mResultList;

/**

* Handles autocomplete requests.

private GeoDataClient mGeoDataClient;

/**

* The bounds used for Places Geo Data autocomplete API requests.

private LatLngBounds mBounds;

/**

* The autocomplete filter used to restrict queries to a specific set of place types.

private AutocompleteFilter mPlaceFilter;

/**

* Initializes with a resource for text rows and autocomplete query bounds.

* @see ArrayAdapter#ArrayAdapter(Context, int)

public PlaceAutocompleteAdapter(Context context, GeoDataClient geoDataClient,

LatLngBounds bounds, AutocompleteFilter filter) {

super(context, android.R.layout.simple_expandable_list_item_2, android.R.id.text1);

mGeoDataClient = geoDataClient;

mBounds = bounds;

mPlaceFilter = filter;

}

/**

* Sets the bounds for all subsequent queries.

public void setBounds(LatLngBounds bounds) {

mBounds = bounds;

}

/**

* Returns the number of results received in the last autocomplete query.

@Override

public int getCount() {

return mResultList.size();

}

/**

* Returns an item from the last autocomplete query.

@Override

public AutocompletePrediction getItem(int position) {

return mResultList.get(position);

}

@Override

public View getView(int position, View convertView, ViewGroup parent) {

View row = super.getView(position, convertView, parent);

// Sets the primary and secondary text for a row.

// Note that getPrimaryText() and getSecondaryText() return a CharSequence that may contain

// styling based on the given CharacterStyle.

AutocompletePrediction item = getItem(position);

TextView textView1 = (TextView) row.findViewById(android.R.id.text1);

TextView textView2 = (TextView) row.findViewById(android.R.id.text2);

textView1.setText(item.getPrimaryText(STYLE_BOLD));

textView2.setText(item.getSecondaryText(STYLE_BOLD));

return row;

}

/**

* Returns the filter for the current set of autocomplete results.

@Override

public Filter getFilter() {

return new Filter() {

@Override

protected FilterResults performFiltering(CharSequence constraint) {

FilterResults results = new FilterResults();

// We need a separate list to store the results, since

// this is run asynchronously.

ArrayList<AutocompletePrediction> filterData = new ArrayList<>();

// Skip the autocomplete query if no constraints are given.

if (constraint != null) {

// Query the autocomplete API for the (constraint) search string.

filterData = getAutocomplete(constraint);

}

results.values = filterData;

if (filterData != null) {

results.count = filterData.size();

} else {

results.count = 0;

}

return results;

}

@Override

protected void publishResults(CharSequence constraint, FilterResults results) {

if (results != null && results.count > 0) {

// The API returned at least one result, update the data.

mResultList = (ArrayList<AutocompletePrediction>) results.values;

notifyDataSetChanged();

} else {

// The API did not return any results, invalidate the data set.

notifyDataSetInvalidated();

}

@Override

public CharSequence convertResultToString(Object resultValue) {

// Override this method to display a readable result in the AutocompleteTextView

// when clicked.

if (resultValue instanceof AutocompletePrediction) {

return ((AutocompletePrediction) resultValue).getFullText(null);

} else {

return super.convertResultToString(resultValue);

}

};

}

/**

* Submits an autocomplete query to the Places Geo Data Autocomplete API.

* Results are returned as frozen AutocompletePrediction objects, ready to be cached.

* Returns an empty list if no results were found.

* Returns null if the API client is not available or the query did not complete

* successfully.

* This method MUST be called off the main UI thread, as it will block until data is returned

* from the API, which may include a network request.

* @param constraint Autocomplete query string

* @return Results from the autocomplete API or null if the query was not successful.

* @see GeoDataClient#getAutocompletePredictions(String, LatLngBounds, AutocompleteFilter)

* @see AutocompletePrediction#freeze()

private ArrayList<AutocompletePrediction> getAutocomplete(CharSequence constraint) {

Log.i(TAG, "Starting autocomplete query for: " + constraint);

// Submit the query to the autocomplete API and retrieve a PendingResult that will

// contain the results when the query completes.

Task<AutocompletePredictionBufferResponse> results =

mGeoDataClient.getAutocompletePredictions(constraint.toString(), mBounds,

mPlaceFilter);

// This method should have been called off the main UI thread. Block and wait for at most

// 60s for a result from the API.

try {

Tasks.await(results, 60, TimeUnit.SECONDS);

} catch (ExecutionException | InterruptedException | TimeoutException e) {

e.printStackTrace();

}

try {

AutocompletePredictionBufferResponse autocompletePredictions = results.getResult();

Log.i(TAG, "Query completed. Received " + autocompletePredictions.getCount()

+ " predictions.");

// Freeze the results immutable representation that can be stored safely.

return DataBufferUtils.freezeAndClose(autocompletePredictions);

} catch (RuntimeExecutionException e) {

// If the query did not complete successfully return null

Toast.makeText(getContext(), "Error contacting API: " + e.toString(),

Toast.LENGTH_SHORT).show();

Log.e(TAG, "Error getting autocomplete prediction API call", e);

return null;

}

And With this, you will now be able to suggest places within your application.

For better understanding try creating a small demo project first using these files only.

Keep coding and Keep Sharing 🙂