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[Android] 구글맵(GoogleMap) 현재위치 따라가기 본문

Java,Android

[Android] 구글맵(GoogleMap) 현재위치 따라가기

덜지 2017. 5. 18. 16:22

Fragment위의 구글맵에서 현재 위치에 마커표시 하는 방법을 알아보겠습니다.


GoogleMap SDK 설치 및 API KEY 발급받기 (  http://duzi077.tistory.com/120 ) 참조


Fragment 구현 ( http://duzi077.tistory.com/119 ) 참조


구글맵 띄우기 ( http://duzi077.tistory.com/121 ) 참조





Google Maps Android API, Google Places API for Android, fused location provider 을 이용해야 합니다.


단말기의 위치정보를 이용하여 구글 맵에서 현재 위치를 표시하는 가이드를 살펴보겠습니다.

소스코드는 제일 하단에 있습니다. ( Activity 구현하시는 분은 가이드를 참고해주시고, Fragment로 구현하시는 분은 하단 소스코드를 참고하시면 됩니다.)



1. Google API Client 생성


Google Play services API Client 인스턴스를 생성해야합니다. 그 인스턴스로 fused location provider 와 Google Places API에 연결할 수 있습니다.

private GoogleApiClient mGoogleApiClient;



Activity 의 onCreate() 에 객체를 초기화 합니다.

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    // Do other setup activities here too, as described elsewhere in this tutorial.

    // Build the Play services client for use by the Fused Location Provider and the Places API.
    // Use the addApi() method to request the Google Places API and the Fused Location Provider.
    mGoogleApiClient = new GoogleApiClient.Builder(this)
            .enableAutoManage(this /* FragmentActivity */,
                    this /* OnConnectionFailedListener */)
            .addConnectionCallbacks(this)
            .addApi(LocationServices.API)
            .addApi(Places.GEO_DATA_API)
            .addApi(Places.PLACE_DETECTION_API)
            .build();
    mGoogleApiClient.connect();
}

Fragment의 경우 getActivity() 를 쓰면  Activity의 this 처럼 사용할 수 있습니다.





2.  위치 권한 요청


디바이스의 위치를 받기위해 반드시 위치 권한을 요청해야 합니다. 


manifest 에 추가합니다.


<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.currentplacedetailsonmap">
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
</manifest>




3. 앱에 런타임 퍼미션 요청


private void getDeviceLocation() {
    if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
            android.Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        mLocationPermissionGranted = true;
    } else {
        ActivityCompat.requestPermissions(this,
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
    }
    // A step later in the tutorial adds the code to get the device location.
}



4. 콜백 메서드 오버라이드

@Override
public void onRequestPermissionsResult(int requestCode,
                                       @NonNull String permissions[],
                                       @NonNull int[] grantResults) {
    mLocationPermissionGranted = false;
    switch (requestCode) {
        case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
            // If request is cancelled, the result arrays are empty.
            if (grantResults.length > 0
                    && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                mLocationPermissionGranted = true;
            }
        }
    }
    updateLocationUI();
}




5. xml에 구글 맵 추가


<fragment xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/map"
    android:name="com.google.android.gms.maps.SupportMapFragment"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context="com.example.currentplacedetailsonmap.MapsActivityCurrentPlace" />


6. 레이아웃 설정


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



7. 구글맵 콜백 인터페이스 추가하고 onMapReady() 오버라이드


public class MapsActivityCurrentPlace extends AppCompatActivity
        implements OnMapReadyCallback,
                GoogleApiClient.ConnectionCallbacks,
                GoogleApiClient.OnConnectionFailedListener {
    /**
     * Manipulates the map when it's available.
     * This callback is triggered when the map is ready to be used.
     */
    @Override
    public void onMapReady(GoogleMap map) {
        mMap = map;

        // Do other setup activities here too, as described elsewhere in this tutorial.

        // Turn on the My Location layer and the related control on the map.
        updateLocationUI();

        // Get the current location of the device and set the position of the map.
        getDeviceLocation();
    }
}



8. onConnected() 함수 구현

/**
 * Builds the map when the Google Play services client is successfully connected.
 */
@Override
public void onConnected(Bundle connectionHint) {
    SupportMapFragment mapFragment = (SupportMapFragment) getSupportFragmentManager()
            .findFragmentById(R.id.map);
    mapFragment.getMapAsync(this);
}



9. 위치 권한 설정 여부에따라 구글맵에 디바이스의 위치를 설정


private void updateLocationUI() {
    if (mMap == null) {
        return;
    }

    /*
     * Request location permission, so that we can get the location of the
     * device. The result of the permission request is handled by a callback,
     * onRequestPermissionsResult.
     */
    if (ContextCompat.checkSelfPermission(this.getApplicationContext(),
            android.Manifest.permission.ACCESS_FINE_LOCATION)
            == PackageManager.PERMISSION_GRANTED) {
        mLocationPermissionGranted = true;
    } else {
        ActivityCompat.requestPermissions(this,
                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION},
                PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
    }

    if (mLocationPermissionGranted) {
        mMap.setMyLocationEnabled(true);
        mMap.getUiSettings().setMyLocationButtonEnabled(true);
    } else {
        mMap.setMyLocationEnabled(false);
        mMap.getUiSettings().setMyLocationButtonEnabled(false);
        mLastKnownLocation = null;
    }
}



10. 디바이스의 위치정보를 얻어서 맵 이동하기

private void getDeviceLocation() {
    /*
     * Before getting the device location, you must check location
     * permission, as described earlier in the tutorial. Then:
     * Get the best and most recent location of the device, which may be
     * null in rare cases when a location is not available.
     */
    if (mLocationPermissionGranted) {
        mLastKnownLocation = LocationServices.FusedLocationApi
                .getLastLocation(mGoogleApiClient);
    }

    // Set the map's camera position to the current location of the device.
    if (mCameraPosition != null) {
        mMap.moveCamera(CameraUpdateFactory.newCameraPosition(mCameraPosition));
    } else if (mLastKnownLocation != null) {
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(
                new LatLng(mLastKnownLocation.getLatitude(),
                        mLastKnownLocation.getLongitude()), DEFAULT_ZOOM));
    } else {
        Log.d(TAG, "Current location is null. Using defaults.");
        mMap.moveCamera(CameraUpdateFactory.newLatLngZoom(mDefaultLocation, DEFAULT_ZOOM));
        mMap.getUiSettings().setMyLocationButtonEnabled(false);
    }
}



11. 현재 위치 얻기

private void showCurrentPlace() {
    if (mMap == null) {
        return;
    }

    if (mLocationPermissionGranted) {
        // Get the likely places - that is, the businesses and other points of interest that
        // are the best match for the device's current location.
        @SuppressWarnings("MissingPermission")
        PendingResult<PlaceLikelihoodBuffer> result = Places.PlaceDetectionApi
                .getCurrentPlace(mGoogleApiClient, null);
        result.setResultCallback(new ResultCallback<PlaceLikelihoodBuffer>() {
            @Override
            public void onResult(@NonNull PlaceLikelihoodBuffer likelyPlaces) {
                int i = 0;
                mLikelyPlaceNames = new String[mMaxEntries];
                mLikelyPlaceAddresses = new String[mMaxEntries];
                mLikelyPlaceAttributions = new String[mMaxEntries];
                mLikelyPlaceLatLngs = new LatLng[mMaxEntries];
                for (PlaceLikelihood placeLikelihood : likelyPlaces) {
                    // Build a list of likely places to show the user. Max 5.
                    mLikelyPlaceNames[i] = (String) placeLikelihood.getPlace().getName();
                    mLikelyPlaceAddresses[i] = (String) placeLikelihood.getPlace().getAddress();
                    mLikelyPlaceAttributions[i] = (String) placeLikelihood.getPlace()
                            .getAttributions();
                    mLikelyPlaceLatLngs[i] = placeLikelihood.getPlace().getLatLng();

                    i++;
                    if (i > (mMaxEntries - 1)) {
                        break;
                    }
                }
                // Release the place likelihood buffer, to avoid memory leaks.
                likelyPlaces.release();

                mMap.addMarker(new MarkerOptions()
                .title(LikelyPlaceNames[0])


                .position(new LatLng(LikelyLatLngs[0].latitude, LikelyLatLngs[0].longitude));


                .snippet(LikelyAddresses[0]);


            }
        });
    } else {
        // Add a default marker, because the user hasn't selected a place.
        mMap.addMarker(new MarkerOptions()
                .title(getString(R.string.default_info_title))
                .position(mDefaultLocation)
                .snippet(getString(R.string.default_info_snippet)));
    }
}




전체 소스 코드



fragment_fragment1.xml

Fragment1.java

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