[JAVA] How to display Map using Google Map API (Android)

Overview

I had a chance to use it in the development of my own Android application, so make a note of it. It can be used when you want to embed Google Map as part of the application.

Advance preparation

You must be logged in with your Google account ★ How to create a Google account

Install Google Play services

Install Google Play services from AndroidStudio> Tool> SDK Manager

Associate Google Play services with your project

-Implement Google Play services in build.gradle

build.gradle

dependencies {
    ...
    implementation 'com.google.android.gms:play-services:+'
}

Add meta-data to Android Manifest

Add the following after </ activity> and between </ application>

AndroidManifest.xml

<meta-data
    android:name="com.google.android.gms.version"
    android:value="@integer/google_play_services_version" />

Get Google Map API Key

Key generation

1. Enable the Maps SDK for Android from the API Library (https://console.developers.google.com/apis/library?project=golfscoremanagement)

2. Create a project from Dashboard Project name: any name Location: If it is a self-made application, "no organization" is OK

3. After that, create credentials in the created project ・ Select the API key on this screen

4. Limit keys ・ At this point, your API key is created

Name: any name Application Limits: Select Android App Package name: Enter the package name of the target application SHA-1: ★ I will explain later ★

5. Confirmation of SHA-1 Open a terminal on your Mac and run the following command

• Cannot be executed unless JAVA JDK is installed. Let's install according to the error.

Terminal

keytool -list -v -keystore ~/.android/debug.keystore -alias androiddebugkey -storepass android -keypass android

・ Execution result (example)

Terminal

SHA1: 0R:B9:4Z:33:22:33:AA:BB:CC:55:66:77:GG:88:77:12:34:AB:CD:PP

There is a SHA-1 fingerprint in the part that is displayed as "Zura". Select the "0R: B9: 4Z: 33: 22: 33: AA: BB: CC: 55: 66: 77: GG: 88: 77: 12: 34: AB: CD: PP" part Paste it on SHA-1 in step 4 and press the Finish button to save it.

After saving, check the API Key. (I will use it later)

Add resources

Create and add google_map_api.xml to res> values

google_map_api.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="google_maps_key" templateMergeStrategy="preserve" translatable="false">API Key</string>
</resources>

★ API Key is the one obtained in step 5 (the part written here)

Add Permission

Describe the following in <manifest> (permission of Parmission)

AndroidManifest.xm

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

Make OpenGL ES available

Also add to Android Manifest (same location as Parmission)

AndroidManifest.xm

    <uses-feature
        android:glEsVersion="0x00020000"
        android:required="true"/>

Added meta-data

Add it below the meta-data added at the beginning

AndroidManifest.xm

        </activity>
        <meta-data
            android:name="com.google.android.gms.version"
            android:value="@integer/google_play_services_version" />
        <meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key"/>
</application>

Implementation

Created on the assumption that it will be incorporated into an existing application.

MapActivity.java

MapActivity.java

import android.support.v4.app.FragmentActivity;
import android.os.Bundle;

import com.google.android.gms.maps.CameraUpdateFactory;
import com.google.android.gms.maps.GoogleMap;
import com.google.android.gms.maps.OnMapReadyCallback;
import com.google.android.gms.maps.SupportMapFragment;
import com.google.android.gms.maps.model.LatLng;
import com.google.android.gms.maps.model.MarkerOptions;

public class MapActivity extends FragmentActivity implements OnMapReadyCallback {

    private GoogleMap mMap;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_map);
        SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
                .findFragmentById(R.id.map);
        mapFragment.getMapAsync(this);
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        mMap = googleMap;

        // Add a marker in Sydney, Australia, and move the camera.
        LatLng sydney = new LatLng(-34, 151);
        mMap.addMarker(new MarkerOptions().position(sydney).title("Marker in Sydney"));
        mMap.moveCamera(CameraUpdateFactory.newLatLng(sydney));
    }
}

activity_map.xml

activity_map.xml

<fragment 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"
    android:id="@+id/map"
    tools:context=".MapActivity"
    android:name="com.google.android.gms.maps.SupportMapFragment" />

Execution result