Question

Android Studio 3.0，Gradle 4.4，Java 1.8，Android 6.0 我尝试显示带有标记的google map。所以。在清单文件中：

<meta-data
            android:name="com.google.android.geo.API_KEY"
            android:value="@string/google_maps_key" />

这是我在Fragment中的代码：

    @Override
    public void onRequestPermissionsResult(int requestCode, @NonNull String permissions[], @NonNull int[] grantResults) {
        switch (requestCode) {
            case 1: {
                if (grantResults.length > 0) {
                    if (grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                        Debug.d(TAG, "onRequestPermissionsResult: GRANTED ---> moveMyLocation()");
                        myLastLocation = getMyLastLocation();
                        MyApplication.setMyLocation(myLastLocation);
                        moveMyLastLocation();
                        updateMarkers();
                    } else {
                        Debug.w(TAG, "onRequestPermissionsResult: NOT_GRANTED");
                    }
                } else {
                    Debug.w(TAG, "onRequestPermissionsResult: NOT GRANEED");
                }
            }
            default:
                super.onRequestPermissionsResult(requestCode, permissions, grantResults);
        }
    }

  private void updateMarkers() {
        for (Marker marker : markersList) {
            marker.remove();
        }
        RealmResults<Merchant> merchantsRealmResults = MerchantService.getMerchants(realm, filter, null);
        for (Merchant merchant : merchantsRealmResults) {
            RealmList<PointOfSale> pointOfSaleRealmList = merchant.getPointsOfSale();
            for (PointOfSale pointOfSale : pointOfSaleRealmList) {
                Coordinates coordinates = pointOfSale.getCoordinates();
                LatLng latLng = new LatLng(coordinates.getLatitude(), coordinates.getLongitude());
                Marker marker = googleMap.addMarker(new MarkerOptions().position(latLng));
                marker.setIcon(BitmapDescriptorFactory.fromResource(R.drawable.ic_map_info_marker));
                marker.setTag(pointOfSale);
                markersList.add(marker);
            }
        }
        Debug.d(TAG, "updateMarkers: markersList.size = " + markersList.size());
    }

结果（logcat）：

 onMapReady: 
 onMapReady: ---> permission is already granted
 onConnected: 
 onConnected: ---> permission is already granted ---> updateMarkers() and moveMyLocation()
 updateMarkers: filter = 
 BUNDLE(0):

 getMerchants: sortByFieldName = null, filter = 
 BUNDLE(0):

 updateMarkers: current pointOfSale = 
 id = 238, coordinates = Coordinates{latitude = 35.3237104, longitude = 33.3149413}}
 updateMarkers: current pointOfSale = 
 id = 227, coordinates = Coordinates{latitude = 35.126413, longitude = 33.429859}}
updateMarkers: markersList.size = 2

如您所见，我成功将所有标记添加到markersList，但是地图为空。

首先启动它，询问我有关许可的信息。我选择“ 允许”

但未显示地图。也不会在地图上显示标记。

也在logcat中：

E/Google Maps Android API(21307): Authorization failure.  Please see https://developers.google.com/maps/documentation/android-api/start for how to correctly set up the map.
E/Google Maps Android API(21307): In the Google Developer Console 

(https://console.developers.google.com)
E/Google Maps Android API(21307): Ensure that the "Google Maps Android API v2" is enabled.
E/Google Maps Android API(21307): Ensure that the following Android Key exists:
E/Google Maps Android API(21307):   API Key: AIzaSyxxxx1BRHy1GhlvJvj7dcAmAc-Is
E/Google Maps Android API(21307):   Android Application (<cert_fingerprint>;<package_name>): xxxxxB:1A:0D:B9;com.my.projectandroid.customer.debug

为什么不显示地图和标记？

Answer 1

logcat说您需要设置google maps api并获取有效的api密钥，这就是地图片段显示此空白屏幕的原因。要获取Google Maps api密钥，您需要转到Google Api并将您的项目添加到Google Maps android api。

logcat提供了链接来解决您的问题first link - step 4和second link

在地图上不显示地图和标记

1 个答案: