Question

我有点困惑......在互联网上找不到任何东西。

我想在标签片段中显示谷歌地图。它运作良好。但是如何设置片段的当前经度和纬度？

这是xml：

compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'

地图片段

<FrameLayout 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"
tools:context=".TabMap"
android:background="#DBDBDB">

<com.google.android.gms.maps.MapView
    android:id="@+id/map"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:layout_marginBottom="60dp"
    android:layout_marginLeft="20dp"
    android:layout_marginRight="20dp"
    android:layout_marginTop="10dp">

</com.google.android.gms.maps.MapView>

}

location.class

public class TabMap extends Fragment implements OnMapReadyCallback{

GoogleMap mGoogleMap ;
MapView mMapView;
View mView;

Location location = new Location();

public TabMap() {
    // Required empty public constructor
}


@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {
    // Inflate the layout for this fragment
    mView =  inflater.inflate(R.layout.fragment_tab_map, container, false);
    return mView;
}


@Override
public void onViewCreated(View view, Bundle savedInstanceState) {
    super.onViewCreated(view, savedInstanceState);

    mMapView = (MapView) mView.findViewById(R.id.map);
    if(mMapView != null) {
        mMapView.onCreate(null);
        mMapView.onResume();
        mMapView.getMapAsync(this);
    }
}

@Override
public void onMapReady(GoogleMap googleMap) {

    MapsInitializer.initialize(getContext());

    mGoogleMap = googleMap;
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);

    googleMap.addMarker(new MarkerOptions().position(new LatLng(51.1657, 10.4515)).title("Germany"));

    CameraPosition de = CameraPosition.builder().target(new LatLng(51.1657, 10.4515)).zoom(6).bearing(0).build();

    googleMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));
}

}

因此。我有一个导航栏，可以选择添加位置（location.class）它打开并点击“当前位置”按钮，它在TextView中显示纬度和经度。

但是我如何将这些信息传递给TabMap.class，googleMap.addMarker方法？

提前致谢！

Answer 1

将此代码放在OnMapReady方法中:(它以蓝点显示您的位置。）

    @Override
    public void onMapReady(GoogleMap googleMap) {
        if (mMap != null) {
            return;
        }

        mMap = googleMap;
        if (mMap == null) {
            return;
        }

        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            // TODO: Consider calling
            //    ActivityCompat#requestPermissions
            // here to request the missing permissions, and then overriding
            //   public void onRequestPermissionsResult(int requestCode, String[] permissions,
            //                                          int[] grantResults)
            // to handle the case where the user grants the permission. See the documentation
            // for ActivityCompat#requestPermissions for more details.
            return;
        }
        mMap.setMyLocationEnabled(true);

        mMap.setOnMyLocationChangeListener(new mMap.OnMyLocationChangeListener() {
        @Override
        public void onMyLocationChange(Location location) {
            if(location!=null){
                mMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude())).title("Germany"));
                CameraPosition de = CameraPosition.builder().target(new LatLng(location.getLatitude(), location.getLongitude())).zoom(6).bearing(0).build();
                mMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));
            }               
        }
    });
    }

Answer 2

在onMapReady方法

中替换此代码

@Override
public void onMapReady(GoogleMap googleMap) {

    MapsInitializer.initialize(getContext());

    mGoogleMap = googleMap;
    googleMap.setMapType(GoogleMap.MAP_TYPE_NORMAL);
    mGoogleMap.setMyLocationEnabled(true);
    mGoogleMap.setOnMyLocationChangeListener(new GoogleMap.OnMyLocationChangeListener() {
        @Override
        public void onMyLocationChange(Location location) {
            if(location!=null){
                mGoogleMap.addMarker(new MarkerOptions().position(new LatLng(location.getLatitude(), location.getLongitude())).title("Germany"));
                CameraPosition de = CameraPosition.builder().target(new LatLng(location.getLatitude(), location.getLongitude())).zoom(6).bearing(0).build();
                mGoogleMap.moveCamera(CameraUpdateFactory.newCameraPosition(de));
            }               
        }
    });
}

Answer 3

您的问题是您无法进行活动和片段通信。实现此目的的一种简单方法是使用库EventBus： https://github.com/greenrobot/EventBus

请阅读文档。

将当前位置添加到fragment.class

3 个答案: