安卓谷歌地图里面的片段不显示地图

Question

在片段中放一张地图，只是想做显示悉尼的基本事情。有水印，但它只是空白。

<com.google.android.gms.maps.MapView
android:id="@+id/map_view"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
override fun onActivityCreated(savedInstanceState: Bundle?) {
super.onActivityCreated(savedInstanceState)
map_view.onCreate(savedInstanceState)
map_view.onResume()
MapsInitializer.initialize(context)
map_view.getMapAsync(this)
}
override fun onMapReady(googleMap: GoogleMap) {
mMap = googleMap
val sydney = LatLng(-34.0, 151.0)
mMap.addMarker(MarkerOptions().position(sydney).title("Marker Title").snippet("Marker Description"))
val cameraPosition = CameraPosition.Builder().target(sydney).zoom(12f).build()
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
}

Answer 1

尝试下面的代码。

private Marker sydney;
private static final LatLng SYDNEY = new LatLng(-33.87365, 151.20689);
private GoogleMap mMap;

override fun onMapReady(googleMap: GoogleMap) {
mMap = googleMap
sydney =  mMap.addMarker(new MarkerOptions().position(SYDNEY).title("Marker Title").snippet("Marker Description"))
val cameraPosition = CameraPosition.Builder().target(SYDNEY).zoom(12f).build()
mMap.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition))
}

您可以参考此页面以获取更多示例。 希望有帮助。

Answer 2

您是否在类片段上实现了OnMapReadyCallback？例如：

class MylocationMap : Fragment() ,OnMapReadyCallback{}