How implement Google Maps APIs in android

In this blog,
I have shown you how to add the google map in your application step by step.

Android allows us to integrate google maps in our application to show any shop, routes, restaurants, location etc. on the map.

Google made new Maps V2 API as a part of Google Play Services SDK.

How to implement the map in your application

Step 1: Add the play service library into your project build.gradle

compile 'com.google.android.gms:play-services-maps:8.3.0'

1

compile 'com.google.android.gms:play-services-maps:8.3.0'

Step 2: After adding the library you can use Google Map – Layout file where you want to display the map

<fragment
   android:id="@+id/map"
   android:name="com.google.android.gms.maps.MapFragment"
   android:layout_width="match_parent"
   android:layout_height="match_parent"/>

<fragment

android:id="@+id/map"

android:name="com.google.android.gms.maps.MapFragment"

android:layout_width="match_parent"

android:layout_height="match_parent"/>

Step 3: Add some permissions with the Google Map API key in the AndroidManifest.XML file

<!--Permissions-->

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<application
<!--Google MAP API key-->
<meta-data 
           android:name="com.google.android.maps.v2.API_KEY" 
           android:value="your google api key" /> 
<!-- Required after latest Google Play Services update -->
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
</application>

<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

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

<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />

<application

<meta-data

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

android:value="your google api key" />

<meta-data

android:name="com.google.android.gms.version"

android:value="@integer/google_play_services_version" />

</application>

Step 4: Get the Api key from here.

For generating the API key you have to create a new project or select the existing one

After selecting the project you have to select Android on the add credentials to your project section

After fill the all the requirments you get the API key from google.

You can also you the existing API key.

Step 5: Initilize the Map

private void initilizeMap() {
        if (googleMap == null) {
            googleMap = ((MapFragment) getFragmentManager().findFragmentById(
                    R.id.map)).getMap();

            UiSettings mapSettings;
            mapSettings = googleMap.getUiSettings();
            mapSettings.setZoomControlsEnabled(true);

            if (android.os.Build.VERSION.SDK_INT > 9) {
                StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();
                StrictMode.setThreadPolicy(policy);
            }

            // check if map is created successfully or not
            if (googleMap == null) {
                Toast.makeText(getApplicationContext(),
                        R.string.sorry_unable_to_create_maps, Toast.LENGTH_SHORT)
                        .show();
            }
        }
    }

private void initilizeMap() {

if (googleMap == null) {

googleMap = ((MapFragment) getFragmentManager().findFragmentById(

R.id.map)).getMap();

UiSettings mapSettings;

mapSettings = googleMap.getUiSettings();

mapSettings.setZoomControlsEnabled(true);

if (android.os.Build.VERSION.SDK_INT > 9) {

StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder().permitAll().build();

StrictMode.setThreadPolicy(policy);

}

// check if map is created successfully or not

if (googleMap == null) {

Toast.makeText(getApplicationContext(),

R.string.sorry_unable_to_create_maps, Toast.LENGTH_SHORT)

.show();

}

Step 6: Adding Markers

You can create markers on the map via the Marker class.

MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude1, longitute1)).title(address); 
Marker m=googleMap.addMarker(marker);

1 2	MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude1, longitute1)).title(address); Marker m=googleMap.addMarker(marker);

Step 7: Zoom Camera

//for zoom level modify bound
CameraUpdate cu = CameraUpdateFactory.newLatLngZoom(marker.getPosition(), 6f);
// for move the camera
googleMap.moveCamera(cu);

//for zoom level modify bound

CameraUpdate cu = CameraUpdateFactory.newLatLngZoom(marker.getPosition(), 6f);

// for move the camera

googleMap.moveCamera(cu);

This is method newLatLngZoom(LatLng latLng, float zoom).
Step 8: If You want then can animate the map

googleMap.animateCamera(cu);

1	googleMap.animateCamera(cu);

How to add multiple markers

In this example, I have taken three country codes and display it on google map

if (googleMap == null)
        initilizeMap();

try {
        String country[] = {
                "UK",
                "IN",
                "IS"
        };
        for (int i = 0; i < 3; i++) {
            getLatLong(this.getLocationInfo(country[i]));
            // create marker
            MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude1, longitute1))
                    .title(country[i]);
            Marker m = googleMap.addMarker(marker);
            LatLngBounds.Builder builder = new LatLngBounds.Builder();
            builder.include(m.getPosition());
            //for zoom level modify bound
            CameraUpdate cu = CameraUpdateFactory.newLatLngZoom(marker.getPosition(), 3 f);
            googleMap.moveCamera(cu);
        }
    } catch (Exception e) {
        Log.d("Exception in marking location in map", e.getMessage());
    }

//Method for Location Information
public static JSONObject getLocationInfo(String address) {
        StringBuilder responseStrBuilder = new StringBuilder();
        address = address.replaceAll(" ", "%20");
        try {
            java.net.URL url = new URL("http://maps.google.com/maps/api/geocode/json?address=" + address + "&sensor=false");

            HttpURLConnection conn = (HttpURLConnection) url.openConnection();
            conn.connect();

            InputStream is = conn.getInputStream();
            BufferedReader streamReader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

            String inputStr;
            while ((inputStr = streamReader.readLine()) != null)
                responseStrBuilder.append(inputStr);

        } catch (IOException e) {
            e.printStackTrace();
        }
        JSONObject jsonObject = new JSONObject();
        try {
            jsonObject = new JSONObject(responseStrBuilder.toString());
        } catch (JSONException e) {
            e.printStackTrace();
        }
        Log.d("jsonObject", jsonObject + "");
        return jsonObject;
    }

if (googleMap == null)

initilizeMap();

try {

String country[] = {

"UK",

"IN",

"IS"

};

for (int i = 0; i < 3; i++) {

getLatLong(this.getLocationInfo(country[i]));

// create marker

MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude1, longitute1))

.title(country[i]);

Marker m = googleMap.addMarker(marker);

LatLngBounds.Builder builder = new LatLngBounds.Builder();

builder.include(m.getPosition());

//for zoom level modify bound

CameraUpdate cu = CameraUpdateFactory.newLatLngZoom(marker.getPosition(), 3 f);

googleMap.moveCamera(cu);

}

} catch (Exception e) {

Log.d("Exception in marking location in map", e.getMessage());

}

//Method for Location Information

public static JSONObject getLocationInfo(String address) {

StringBuilder responseStrBuilder = new StringBuilder();

address = address.replaceAll(" ", "%20");

try {

java.net.URL url = new URL("http://maps.google.com/maps/api/geocode/json?address=" + address + "&sensor=false");

HttpURLConnection conn = (HttpURLConnection) url.openConnection();

conn.connect();

InputStream is = conn.getInputStream();

BufferedReader streamReader = new BufferedReader(new InputStreamReader(is, "UTF-8"));

String inputStr;

while ((inputStr = streamReader.readLine()) != null)

responseStrBuilder.append(inputStr);

} catch (IOException e) {

e.printStackTrace();

}

JSONObject jsonObject = new JSONObject();

try {

jsonObject = new JSONObject(responseStrBuilder.toString());

} catch (JSONException e) {

e.printStackTrace();

}

Log.d("jsonObject", jsonObject + "");

return jsonObject;

}

//Method for getting latitude and longitute 
public static boolean getLatLong(JSONObject jsonObject) {

        try {

            longitute1 = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lng");

            latitude1 = ((JSONArray) jsonObject.get("results")).getJSONObject(0)
                    .getJSONObject("geometry").getJSONObject("location")
                    .getDouble("lat");

        } catch (JSONException e) {
            return false;
        }
        return true;
    }

//Method for getting latitude and longitute

public static boolean getLatLong(JSONObject jsonObject) {

try {

longitute1 = ((JSONArray) jsonObject.get("results")).getJSONObject(0)

.getJSONObject("geometry").getJSONObject("location")

.getDouble("lng");

latitude1 = ((JSONArray) jsonObject.get("results")).getJSONObject(0)

.getJSONObject("geometry").getJSONObject("location")

.getDouble("lat");

} catch (JSONException e) {

return false;

}

return true;

}

Aman Gupta

Coder DNA. Like to solve strenuous problems.

22 Dec, 2016
Updated by - Aman Gupta
18 Apr, 2016
Updated by - Aman Gupta

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How implement Google Maps APIs in android

How to implement the map in your application

How to add multiple markers

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