Android

Find NearBy Places from Current Location in Google Maps with Retrofit


Create Project

Create new project in Android Studio with steps as below:

Step 1: Input Project Name and Select Project Location

Step 2: Select SDK for Android App

Step 3: Select Default Activity for App

Step 4: Finish create project




Google Map API

Login to https://console.developers.google.com and create Places API key for testing. Create new xml file named google_maps_api.xml in res/values folder contains Places API key:

AIzaSyB9MxxJBmzLHdfsMEZSdV0vORR_MRwirPI

Add Library as Dependencies

Open build.gradle file in Gradle Scripts and add new library as below:

implementation 'com.google.android.gms:play-services-maps:15.0.1'
implementation 'com.google.android.gms:play-services-location:15.0.1'
implementation 'com.google.api-client:google-api-client:1.23.0'

implementation 'com.squareup.retrofit2:retrofit:2.3.0'
implementation 'com.google.code.gson:gson:2.6.2'
implementation 'com.squareup.retrofit2:converter-gson:2.1.0'
implementation 'com.squareup.okhttp3:logging-interceptor:3.4.1'
implementation 'com.squareup.okhttp3:okhttp:3.4.1'

implementation 'com.android.support:cardview-v7:26.1.0'

Add Strings

Open res\values\strings.xml file and add new string as below:

<resources>
    <string name="app_name">Learn Android with Real Apps</string>
    <string name="keyword">Keyword...</string>
    <string name="search">Search</string>
</resources>

Manifest Permissions

Open AndroidManifest.xml file in manifest folder, add permissions and google map api as below:

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

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

    <application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:roundIcon="@mipmap/ic_launcher_round"
        android:supportsRtl="true"
        android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />
    </application>

</manifest>




Create Entities

Create new package named entities. In this package, create new entities as below:

Location

Create new java class named Location.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;

public class Location implements Serializable {

    @SerializedName("lat")
    private Double lat;

    @SerializedName("lng")
    private Double lng;

    public Double getLat() {
        return lat;
    }

    public void setLat(Double lat) {
        this.lat = lat;
    }

    public Double getLng() {
        return lng;
    }

    public void setLng(Double lng) {
        this.lng = lng;
    }

}

OpeningHours

Create new java class named OpeningHours.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class OpeningHours implements Serializable {

    @SerializedName("open_now")
    private Boolean openNow;

    @SerializedName("weekday_text")
    private List<Object> weekdayText = new ArrayList<Object>();

    /**
     * @return The openNow
     */
    public Boolean getOpenNow() {
        return openNow;
    }

    /**
     * @param openNow The open_now
     */
    public void setOpenNow(Boolean openNow) {
        this.openNow = openNow;
    }

    /**
     * @return The weekdayText
     */
    public List<Object> getWeekdayText() {
        return weekdayText;
    }

    /**
     * @param weekdayText The weekday_text
     */
    public void setWeekdayText(List<Object> weekdayText) {
        this.weekdayText = weekdayText;
    }

}

Photo

Create new java class named Photo.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Photo implements Serializable {

    @SerializedName("height")
    private Integer height;

    @SerializedName("html_attributions")
    private List<String> htmlAttributions = new ArrayList<String>();

    @SerializedName("photo_reference")
    private String photoReference;

    @SerializedName("width")
    private Integer width;

    /**
     * @return The height
     */
    public Integer getHeight() {
        return height;
    }

    /**
     * @param height The height
     */
    public void setHeight(Integer height) {
        this.height = height;
    }

    /**
     * @return The htmlAttributions
     */
    public List<String> getHtmlAttributions() {
        return htmlAttributions;
    }

    /**
     * @param htmlAttributions The html_attributions
     */
    public void setHtmlAttributions(List<String> htmlAttributions) {
        this.htmlAttributions = htmlAttributions;
    }

    /**
     * @return The photoReference
     */
    public String getPhotoReference() {
        return photoReference;
    }

    /**
     * @param photoReference The photo_reference
     */
    public void setPhotoReference(String photoReference) {
        this.photoReference = photoReference;
    }

    /**
     * @return The width
     */
    public Integer getWidth() {
        return width;
    }

    /**
     * @param width The width
     */
    public void setWidth(Integer width) {
        this.width = width;
    }

}

Geometry

Create new java class named Geometry.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;

public class Geometry implements Serializable {

    @SerializedName("location")
    private Location location;

    public Location getLocation() {
        return location;
    }

    public void setLocation(Location location) {
        this.location = location;
    }

}

Result

Create new java class named Result.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class Result implements Serializable {

    @SerializedName("geometry")
    private Geometry geometry;

    @SerializedName("icon")
    private String icon;

    @SerializedName("id")
    private String id;

    @SerializedName("name")
    private String name;

    @SerializedName("opening_hours")
    private OpeningHours openingHours;

    @SerializedName("photos")
    private List<Photo> photos = new ArrayList<Photo>();

    @SerializedName("place_id")
    private String placeId;

    @SerializedName("rating")
    private Double rating;

    @SerializedName("reference")
    private String reference;

    @SerializedName("scope")
    private String scope;

    @SerializedName("types")
    private List<String> types = new ArrayList<String>();

    @SerializedName("vicinity")
    private String vicinity;

    @SerializedName("price_level")
    private Integer priceLevel;

    /**
     * @return The geometry
     */
    public Geometry getGeometry() {
        return geometry;
    }

    /**
     * @param geometry The geometry
     */
    public void setGeometry(Geometry geometry) {
        this.geometry = geometry;
    }

    /**
     * @return The icon
     */
    public String getIcon() {
        return icon;
    }

    /**
     * @param icon The icon
     */
    public void setIcon(String icon) {
        this.icon = icon;
    }

    /**
     * @return The id
     */
    public String getId() {
        return id;
    }

    /**
     * @param id The id
     */
    public void setId(String id) {
        this.id = id;
    }

    /**
     * @return The name
     */
    public String getName() {
        return name;
    }

    /**
     * @param name The name
     */
    public void setName(String name) {
        this.name = name;
    }

    /**
     * @return The openingHours
     */
    public OpeningHours getOpeningHours() {
        return openingHours;
    }

    /**
     * @param openingHours The opening_hours
     */
    public void setOpeningHours(OpeningHours openingHours) {
        this.openingHours = openingHours;
    }

    /**
     * @return The photos
     */
    public List<Photo> getPhotos() {
        return photos;
    }

    /**
     * @param photos The photos
     */
    public void setPhotos(List<Photo> photos) {
        this.photos = photos;
    }

    /**
     * @return The placeId
     */
    public String getPlaceId() {
        return placeId;
    }

    /**
     * @param placeId The place_id
     */
    public void setPlaceId(String placeId) {
        this.placeId = placeId;
    }

    /**
     * @return The rating
     */
    public Double getRating() {
        return rating;
    }

    /**
     * @param rating The rating
     */
    public void setRating(Double rating) {
        this.rating = rating;
    }

    /**
     * @return The reference
     */
    public String getReference() {
        return reference;
    }

    /**
     * @param reference The reference
     */
    public void setReference(String reference) {
        this.reference = reference;
    }

    /**
     * @return The scope
     */
    public String getScope() {
        return scope;
    }

    /**
     * @param scope The scope
     */
    public void setScope(String scope) {
        this.scope = scope;
    }

    /**
     * @return The types
     */
    public List<String> getTypes() {
        return types;
    }

    /**
     * @param types The types
     */
    public void setTypes(List<String> types) {
        this.types = types;
    }

    /**
     * @return The vicinity
     */
    public String getVicinity() {
        return vicinity;
    }

    /**
     * @param vicinity The vicinity
     */
    public void setVicinity(String vicinity) {
        this.vicinity = vicinity;
    }

    /**
     * @return The priceLevel
     */
    public Integer getPriceLevel() {
        return priceLevel;
    }

    /**
     * @param priceLevel The price_level
     */
    public void setPriceLevel(Integer priceLevel) {
        this.priceLevel = priceLevel;
    }

}

PlacesResults

Create new java class named PlacesResults.java as below:

package android.demo.entities;

import com.google.gson.annotations.SerializedName;
import java.io.Serializable;
import java.util.ArrayList;
import java.util.List;

public class PlacesResults implements Serializable {

    @SerializedName("html_attributions")
    private List<Object> htmlAttributions = new ArrayList<Object>();

    @SerializedName("next_page_token")
    private String nextPageToken;

    @SerializedName("results")
    private List<Result> results = new ArrayList<Result>();

    @SerializedName("status")
    private String status;

    public List<Object> getHtmlAttributions() {
        return htmlAttributions;
    }

    public void setHtmlAttributions(List<Object> htmlAttributions) {
        this.htmlAttributions = htmlAttributions;
    }

    public String getNextPageToken() {
        return nextPageToken;
    }

    public void setNextPageToken(String nextPageToken) {
        this.nextPageToken = nextPageToken;
    }

    public List<Result> getResults() {
        return results;
    }

    public void setResults(List<Result> results) {
        this.results = results;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

}




Main Activity Layout

Open res\layout\activity_main.xml file and create layout as below:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
    android:orientation="vertical"
    tools:context=".MainActivity">

    <Button
        android:id="@+id/buttonShowLocation"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="@string/show_my_location" />

    <TextView
        android:id="@+id/textView2"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/latitude"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textViewLatitude"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp" />

    <TextView
        android:id="@+id/textView"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp"
        android:text="@string/longitude"
        android:textStyle="bold" />

    <TextView
        android:id="@+id/textViewLongitude"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginLeft="5dp" />

</LinearLayout>

Create Custom CardView Layout

Select res\layout folder. In this folder, create new layout named place_row_layout.xml as below:

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

    <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto"
        android:id="@+id/card_view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        card_view:cardCornerRadius="0dp"
        card_view:cardElevation="5dp">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:orientation="horizontal">

            <ImageView
                android:id="@+id/imageViewPhoto"
                android:layout_width="100dp"
                android:layout_height="match_parent"
                android:layout_marginBottom="10dp"
                android:layout_marginRight="2dp"
                android:layout_weight="1"
                android:scaleType="fitStart"
                app:srcCompat="@drawable/common_google_signin_btn_icon_dark" />

            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="match_parent"
                android:layout_weight="1"
                android:orientation="vertical">

                <TextView
                    android:id="@+id/textViewName"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="TextView"
                    android:textSize="18sp"
                    android:textStyle="bold" />

                <TextView
                    android:id="@+id/textViewAddress"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="TextView"
                    android:textStyle="bold" />
            </LinearLayout>
        </LinearLayout>
    </android.support.v7.widget.CardView>

</LinearLayout>




Create Custom Adapter

Create new package named adapters. In this package, create new java class named PlacesListAdapter.java as below:

package android.demo.adapters;

import android.content.Context;
import android.demo.entities.Result;
import android.demo.learnandroidwithrealapps.R;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.AsyncTask;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ImageView;
import android.widget.TextView;

import java.io.InputStream;
import java.util.List;

public class PlacesListAdapter extends ArrayAdapter<Result> {

    private Context context;
    private List<Result> results;

    public PlacesListAdapter(Context context, List<Result> results) {
        super(context, R.layout.place_row_layout, results);
        this.context = context;
        this.results = results;
    }

    @NonNull
    @Override
    public View getView(int position, @Nullable View view, @NonNull ViewGroup parent) {
        try {
            ViewHolder viewHolder;
            if(view == null) {
                viewHolder = new ViewHolder();
                view = LayoutInflater.from(context).inflate(R.layout.place_row_layout,null);
                viewHolder.textViewName = view.findViewById(R.id.textViewName);
                viewHolder.textViewAddress = view.findViewById(R.id.textViewAddress);
                viewHolder.imageViewPhoto = view.findViewById(R.id.imageViewPhoto);
                view.setTag(viewHolder);
            } else  {
                viewHolder = (ViewHolder) view.getTag();
            }
            Result result = results.get(position);
            viewHolder.textViewName.setText(result.getName());
            viewHolder.textViewAddress.setText(result.getVicinity());
            Bitmap photo = new ImageRequestAsk().execute(result.getIcon()).get();
            viewHolder.imageViewPhoto.setImageBitmap(photo);
            return view;
        } catch (Exception e) {
            return null;
        }
    }

    public static class ViewHolder {
        public TextView textViewName;
        public TextView textViewAddress;
        public ImageView imageViewPhoto;
    }

    private class ImageRequestAsk extends AsyncTask<String, Void, Bitmap> {

        @Override
        protected Bitmap doInBackground(String... params) {
            try {
                InputStream inputStream = new java.net.URL(params[0]).openStream();
                return BitmapFactory.decodeStream(inputStream);
            } catch (Exception e) {
                return null;
            }
        }

    }

}

Retrofit API

Create new package named api. In this package, create new api as below:

APIClient

Create new java class named APIClient.java as below:

package android.demo.api;

import okhttp3.OkHttpClient;
import okhttp3.logging.HttpLoggingInterceptor;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;

public class APIClient {

    private static Retrofit retrofit = null;

    public static Retrofit getClient() {

        HttpLoggingInterceptor interceptor = new HttpLoggingInterceptor();
        interceptor.setLevel(HttpLoggingInterceptor.Level.BODY);
        OkHttpClient client = new OkHttpClient.Builder().addInterceptor(interceptor).build();
        retrofit = new Retrofit.Builder()
                                .baseUrl("https://maps.googleapis.com/maps/api/")
                                .addConverterFactory(GsonConverterFactory.create())
                                .client(client)
                                .build();
        return retrofit;
    }

}

GoogleMapAPI

Create new interface named GoogleMapAPI.java as below:

package android.demo.api;

import android.demo.entities.PlacesResults;
import retrofit2.Call;
import retrofit2.http.GET;
import retrofit2.http.Query;

public interface GoogleMapAPI {

    @GET("place/nearbysearch/json")
    Call<PlacesResults> getNearBy(
            @Query("location") String location,
            @Query("radius") int radius,
            @Query("type") String type,
            @Query("keyword") String keyword,
            @Query("key") String key
    );

}




Main Activity Class

Add code to MainActivity.java file in android.demo.learnandroidwithrealapps package as below:

package android.demo.learnandroidwithrealapps;

import android.Manifest;
import android.content.pm.PackageManager;
import android.demo.adapters.PlacesListAdapter;
import android.demo.api.APIClient;
import android.demo.api.GoogleMapAPI;
import android.demo.entities.PlacesResults;
import android.demo.entities.Result;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.Spinner;
import android.widget.Toast;

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

import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;

public class MainActivity extends AppCompatActivity {

    private EditText editTextKeyword;
    private Button buttonSearch;
    private ListView listViewPlaces;
    private Spinner spinnerType;

    private LocationManager locationManager;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        loadData();
    }

    private void initView() {
        editTextKeyword = findViewById(R.id.editTextKeyword);
        buttonSearch = findViewById(R.id.buttonSearch);
        buttonSearch.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                buttonSearch_onClick(view);
            }
        });
        listViewPlaces = findViewById(R.id.listViewPlaces);
        spinnerType = findViewById(R.id.spinnerType);
    }

    private void buttonSearch_onClick(View view) {

        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED || ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            locationManager = (LocationManager) getSystemService(LOCATION_SERVICE);
            locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 2 * 1000, 1, locationListener);
        } else {
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_FINE_LOCATION}, 12);
            }
            if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
                ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION}, 13);
            }
        }

    }

    private LocationListener locationListener = new LocationListener() {

        @Override
        public void onLocationChanged(Location location) {
            String keyword = editTextKeyword.getText().toString();
            String key = getText(R.string.google_maps_key).toString();
            String currentLocation = location.getLatitude() + "," + location.getLongitude();
            int radius = 1500;
            String type = spinnerType.getSelectedItem().toString();
            GoogleMapAPI googleMapAPI = APIClient.getClient().create(GoogleMapAPI.class);
            googleMapAPI.getNearBy(currentLocation, radius, type, keyword, key).enqueue(new Callback<PlacesResults>() {
                @Override
                public void onResponse(Call<PlacesResults> call, Response<PlacesResults> response) {
                    if (response.isSuccessful()) {
                        List<Result> results = response.body().getResults();
                        PlacesListAdapter placesListAdapter = new PlacesListAdapter(getApplicationContext(), results);
                        listViewPlaces.setAdapter(placesListAdapter);
                    } else {
                        Toast.makeText(getApplicationContext(), "Failed", Toast.LENGTH_LONG).show();
                    }
                }

                @Override
                public void onFailure(Call<PlacesResults> call, Throwable t) {
                    Toast.makeText(getApplicationContext(), t.getMessage(), Toast.LENGTH_LONG).show();
                }
            });
        }

        @Override
        public void onStatusChanged(String s, int i, Bundle bundle) {

        }

        @Override
        public void onProviderEnabled(String s) {

        }

        @Override
        public void onProviderDisabled(String s) {

        }
    };

    private void loadData() {

        List<String> types = new ArrayList<>();
        types.add("ATM");
        types.add("Cafe");
        types.add("Hotel");
        types.add("Restaurant");
        ArrayAdapter<String> arrayAdapter = new ArrayAdapter<String>(getApplicationContext(), R.layout.support_simple_spinner_dropdown_item, types);
        spinnerType.setAdapter(arrayAdapter);

    }


}

Structure of Project




Run App

Load Main Activity

Select Place Type and Input Keyword

Result


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